cleanup NSR keys

Update dates range in licence

.github/workflows/build-windows.yml

@@ -133,6 +133,8 @@ jobs:
         git clone https://github.com/msys2/MINGW-packages
         cd MINGW-packages
         git checkout 4cbb366edf2f268ac3146174b40ce38604646fc5 mingw-w64-boost
+        cd mingw-w64-boost
+        sed -i 's/boostorg.jfrog.io\/artifactory\/main/archives.boost.io/' PKGBUILD
 
     # headers
     - name: Get headers package version

.github/workflows/docker.yml

@@ -108,7 +108,7 @@ jobs:
       uses: Noelware/docker-manifest-action@master
       with:
         inputs: purplei2p/i2pd:latest
-        images: purplei2p/i2pd:latest-amd64,purplei2p/i2pd:latest-i386,purplei2p/i2pd:latest-arm64,purplei2p/i2pd:latest-armv7
+        tags: purplei2p/i2pd:latest-amd64,purplei2p/i2pd:latest-i386,purplei2p/i2pd:latest-arm64,purplei2p/i2pd:latest-armv7
         push: true
 
     - name: Create and push latest manifest image to GHCR
@@ -116,7 +116,7 @@ jobs:
       uses: Noelware/docker-manifest-action@master
       with:
         inputs: ghcr.io/purplei2p/i2pd:latest
-        images: ghcr.io/purplei2p/i2pd:latest-amd64,ghcr.io/purplei2p/i2pd:latest-i386,ghcr.io/purplei2p/i2pd:latest-arm64,ghcr.io/purplei2p/i2pd:latest-armv7
+        tags: ghcr.io/purplei2p/i2pd:latest-amd64,ghcr.io/purplei2p/i2pd:latest-i386,ghcr.io/purplei2p/i2pd:latest-arm64,ghcr.io/purplei2p/i2pd:latest-armv7
         push: true
 
     - name: Store release version to env
@@ -128,7 +128,7 @@ jobs:
       uses: Noelware/docker-manifest-action@master
       with:
         inputs: purplei2p/i2pd:latest,purplei2p/i2pd:latest-release,purplei2p/i2pd:release-${{ env.RELEASE_VERSION }}
-        images: purplei2p/i2pd:latest-amd64,purplei2p/i2pd:latest-i386,purplei2p/i2pd:latest-arm64,purplei2p/i2pd:latest-armv7
+        tags: purplei2p/i2pd:latest-amd64,purplei2p/i2pd:latest-i386,purplei2p/i2pd:latest-arm64,purplei2p/i2pd:latest-armv7
         push: true
 
     - name: Create and push release manifest to GHCR
@@ -136,5 +136,5 @@ jobs:
       uses: Noelware/docker-manifest-action@master
       with:
         inputs: ghcr.io/purplei2p/i2pd:latest,ghcr.io/purplei2p/i2pd:latest-release,ghcr.io/purplei2p/i2pd:release-${{ env.RELEASE_VERSION }}
-        images: ghcr.io/purplei2p/i2pd:latest-amd64,ghcr.io/purplei2p/i2pd:latest-i386,ghcr.io/purplei2p/i2pd:latest-arm64,ghcr.io/purplei2p/i2pd:latest-armv7
+        tags: ghcr.io/purplei2p/i2pd:latest-amd64,ghcr.io/purplei2p/i2pd:latest-i386,ghcr.io/purplei2p/i2pd:latest-arm64,ghcr.io/purplei2p/i2pd:latest-armv7
         push: true

ChangeLog

@@ -1,6 +1,29 @@
 # for this file format description,
 # see https://github.com/olivierlacan/keep-a-changelog
 
+## [2.56.0] - 2025-02-11
+### Added
+- Config params for shared local destination
+- AddressBook full addresses cache
+- Decline transit tunnel to duplicated router
+- Recreate tunnels in random order
+### Changed
+- Exclude disk operations from SSU2 and NTCP2 threads
+- Set minimal version for peer test to 0.9.62
+- Send ack requested flag after second SSU2 resend attempt
+- Shorter ECIESx25519 ack request interval for datagram and I2CP sessions
+- Don't change datagram routing path too often if unidirectional data stream
+- Reduce LeaseSet and local RouterInfo publishing confirmation intervals
+- Don't delete buffer of connected routers or if an update received
+- Smaller RouterInfo request timeout if sent directly
+- Persist local RouterInfo in separate thread
+- Don't recalculate and process ranges for every SSU2 Ack block
+- Reseeds list
+### Fixed
+- Termination deadlock if SAM session is active
+- Race condition at tunnel endpoint
+- Inbound tunnel build encryption
+
 ## [2.55.0] - 2024-12-30
 ### Added
 - Support boost 1.87

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2013-2023, The PurpleI2P Project
+Copyright (c) 2013-2025, The PurpleI2P Project
 
 All rights reserved.
 

Makefile

@@ -69,6 +69,9 @@ else ifneq (, $(findstring freebsd, $(SYS))$(findstring openbsd, $(SYS)))
 else ifneq (, $(findstring haiku, $(SYS)))
 	DAEMON_SRC += $(DAEMON_SRC_DIR)/UnixDaemon.cpp
 	include Makefile.haiku
+else ifneq (, $(findstring solaris, $(SYS)))
+	DAEMON_SRC += $(DAEMON_SRC_DIR)/UnixDaemon.cpp
+	include Makefile.solaris
 else # not supported
 	$(error Not supported platform)
 endif

Makefile.bsd

@@ -3,7 +3,7 @@ CXXFLAGS ?= ${CXX_DEBUG} -Wall -Wextra -Wno-unused-parameter -pedantic -Wno-misl
 DEFINES = -D_GLIBCXX_USE_NANOSLEEP=1
 INCFLAGS = -I/usr/include/ -I/usr/local/include/
 LDFLAGS = ${LD_DEBUG} -Wl,-rpath,/usr/local/lib -L/usr/local/lib
-LDLIBS = -lcrypto -lssl -lz -lpthread -lboost_system -lboost_program_options
+LDLIBS = -lssl -lcrypto -lz -lpthread -lboost_system -lboost_program_options
 
 ## NOTE: NEEDED_CXXFLAGS is here so that custom CXXFLAGS can be specified at build time
 ## **without** overwriting the CXXFLAGS which we need in order to build.

Makefile.haiku

@@ -1,8 +1,12 @@
+ifeq ($(shell $(CXX) -dumpmachine | cut -c 1-4), i586)
+CXX = g++-x86
+else
 CXX = g++
-CXXFLAGS := -Wall -std=c++17
+endif
+CXXFLAGS := -Wall -std=c++20
 INCFLAGS = -I/system/develop/headers
 DEFINES = -D_DEFAULT_SOURCE -D_GNU_SOURCE
-LDLIBS = -lbe -lbsd -lnetwork -lz -lcrypto -lssl -lboost_system -lboost_program_options -lpthread
+LDLIBS = -lbe -lbsd -lnetwork -lz -lssl -lcrypto -lboost_program_options -lpthread
 
 ifeq ($(USE_UPNP),yes)
 	DEFINES += -DUSE_UPNP

Makefile.homebrew

@@ -18,7 +18,7 @@ endif
 	LDLIBS +=  -lpthread -ldl
 else
 	LDFLAGS += -L${SSLROOT}/lib -L${BOOSTROOT}/lib
-	LDLIBS = -lz -lcrypto -lssl -lboost_system -lboost_filesystem -lboost_program_options -lpthread
+	LDLIBS = -lz -lssl -lcrypto -lboost_system -lboost_filesystem -lboost_program_options -lpthread
 ifeq ($(USE_UPNP),yes)
 	LDFLAGS += -L${UPNPROOT}/lib
 	LDLIBS += -lminiupnpc

Makefile.linux

@@ -40,7 +40,7 @@ ifeq ($(USE_UPNP),yes)
 endif
 	LDLIBS += -lpthread -ldl
 else
-	LDLIBS += -lcrypto -lssl -lz -lboost_program_options -lpthread -latomic
+	LDLIBS += -lssl -lcrypto -lz -lboost_program_options -lpthread -latomic
 ifeq ($(USE_UPNP),yes)
 	LDLIBS += -lminiupnpc
 endif

Makefile.osx

@@ -7,9 +7,9 @@ LDFLAGS += -Wl,-dead_strip
 LDFLAGS += -Wl,-dead_strip_dylibs
 
 ifeq ($(USE_STATIC),yes)
-	LDLIBS = -lz /usr/local/lib/libcrypto.a /usr/local/lib/libssl.a /usr/local/lib/libboost_system.a /usr/local/lib/libboost_filesystem.a /usr/local/lib/libboost_program_options.a -lpthread
+	LDLIBS = -lz /usr/local/lib/libssl.a /usr/local/lib/libcrypto.a /usr/local/lib/libboost_system.a /usr/local/lib/libboost_filesystem.a /usr/local/lib/libboost_program_options.a -lpthread
 else
-	LDLIBS = -lz -lcrypto -lssl -lboost_system -lboost_filesystem -lboost_program_options -lpthread
+	LDLIBS = -lz -lssl -lcrypto -lboost_system -lboost_filesystem -lboost_program_options -lpthread
 endif
 
 ifeq ($(USE_UPNP),yes)

Makefile.solaris

@@ -0,0 +1,9 @@
+CXX = g++
+INCFLAGS = -I/usr/openssl/3/include
+CXXFLAGS := -Wall -std=c++20
+LDLIBS = -L/usr/openssl/3/lib/64 -lssl -lcrypto -lboost_program_options -lz -lpthread -lsocket
+
+ifeq ($(USE_UPNP),yes)
+	DEFINES += -DUSE_UPNP
+	LDLIBS += -lminiupnpc
+endif

build/cmake_modules/GetGitRevisionDescription.cmake

@@ -59,7 +59,7 @@ get_filename_component(_gitdescmoddir ${CMAKE_CURRENT_LIST_FILE} PATH)
 # function returns an empty string via _git_dir_var.
 #
 # Example: Given a path C:/bla/foo/bar and assuming C:/bla/.git exists and
-# neither foo nor bar contain a file/directory .git. This wil return
+# neither foo nor bar contain a file/directory .git. This will return
 # C:/bla/.git
 #
 function(_git_find_closest_git_dir _start_dir _git_dir_var)

contrib/i2pd.conf

@@ -243,7 +243,7 @@ verify = true
 ## Default: reg.i2p at "mainline" I2P Network
 # defaulturl = http://shx5vqsw7usdaunyzr2qmes2fq37oumybpudrd4jjj4e4vk4uusa.b32.i2p/hosts.txt
 ## Optional subscriptions URLs, separated by comma
-# subscriptions = http://reg.i2p/hosts.txt,http://identiguy.i2p/hosts.txt,http://stats.i2p/cgi-bin/newhosts.txt,http://rus.i2p/hosts.txt
+# subscriptions = http://reg.i2p/hosts.txt,http://identiguy.i2p/hosts.txt,http://stats.i2p/cgi-bin/newhosts.txt
 
 [limits]
 ## Maximum active transit sessions (default: 5000)

contrib/i2pd.service

@@ -1,7 +1,8 @@
 [Unit]
 Description=I2P Router written in C++
 Documentation=man:i2pd(1) https://i2pd.readthedocs.io/en/latest/
-After=network.target
+Wants=network.target
+After=network.target network-online.target
 
 [Service]
 User=i2pd

contrib/rpm/i2pd-git.spec

@@ -1,7 +1,7 @@
 %define git_hash %(git rev-parse HEAD | cut -c -7)
 
 Name:          i2pd-git
-Version:       2.55.0
+Version:       2.56.0
 Release:       git%{git_hash}%{?dist}
 Summary:       I2P router written in C++
 Conflicts:     i2pd
@@ -148,6 +148,9 @@ getent passwd i2pd >/dev/null || \
 
 
 %changelog
+* Tue Feb 11 2025 orignal <orignal@i2pmail.org> - 2.56.0
+- update to 2.56.0
+
 * Mon Dec 30 2024 orignal <orignal@i2pmail.org> - 2.55.0
 - update to 2.55.0
 

contrib/rpm/i2pd.spec

@@ -1,5 +1,5 @@
 Name:          i2pd
-Version:       2.55.0
+Version:       2.56.0
 Release:       1%{?dist}
 Summary:       I2P router written in C++
 Conflicts:     i2pd-git
@@ -146,6 +146,9 @@ getent passwd i2pd >/dev/null || \
 
 
 %changelog
+* Tue Feb 11 2025 orignal <orignal@i2pmail.org> - 2.56.0
+- update to 2.56.0
+
 * Mon Dec 30 2024 orignal <orignal@i2pmail.org> - 2.55.0
 - update to 2.55.0
 

contrib/tunnels.conf

@@ -5,6 +5,7 @@ port = 6668
 destination = irc.ilita.i2p
 destinationport = 6667
 keys = irc-keys.dat
+i2p.streaming.profile=2
 
 #[IRC-IRC2P]
 #type = client

daemon/HTTPServer.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -132,7 +132,8 @@ namespace http {
 
 	static void ShowTunnelDetails (std::stringstream& s, enum i2p::tunnel::TunnelState eState, bool explr, int bytes)
 	{
-		std::string state, stateText;
+		std::string state;
+		std::string_view stateText;
 		switch (eState) 
 		{
 			case i2p::tunnel::eTunnelStateBuildReplyReceived :
@@ -146,7 +147,7 @@ namespace http {
 		}
 		if (stateText.empty ()) stateText = tr(state);
 		
-		s << "<span class=\"tunnel " << state << "\"> " << stateText << ((explr) ? " (" + tr("exploratory") + ")" : "") << "</span>, ";
+		s << "<span class=\"tunnel " << state << "\"> " << stateText << ((explr) ? " (" + std::string(tr("exploratory")) + ")" : "") << "</span>, "; // TODO:
 		ShowTraffic(s, bytes);
 		s << "\r\n";
 	}
@@ -213,7 +214,7 @@ namespace http {
 			"</html>\r\n";
 	}
 
-	static void ShowError(std::stringstream& s, const std::string& string)
+	static void ShowError(std::stringstream& s, std::string_view string)
 	{
 		s << "<b>" << tr("ERROR") << ":</b>&nbsp;" << string << "<br>\r\n";
 	}
@@ -1262,7 +1263,7 @@ namespace http {
 			ShowLeasesSets(s);
 		else {
 			res.code = 400;
-			ShowError(s, tr("Unknown page") + ": " + page);
+			ShowError(s, std::string (tr("Unknown page")) + ": " + page); // TODO
 			return;
 		}
 	}
@@ -1418,13 +1419,11 @@ namespace http {
 					{
 						auto signatureLen = dest->GetIdentity ()->GetSignatureLen ();
 						uint8_t * signature = new uint8_t[signatureLen];
-						char * sig = new char[signatureLen*2];
 						std::stringstream out;
 
 						out << name << "=" << dest->GetIdentity ()->ToBase64 ();
 						dest->Sign ((uint8_t *)out.str ().c_str (), out.str ().length (), signature);
-						auto len = i2p::data::ByteStreamToBase64 (signature, signatureLen, sig, signatureLen*2);
+						auto sig = i2p::data::ByteStreamToBase64 (signature, signatureLen);
-						sig[len] = 0;
 						out << "#!sig=" << sig;
 						s << "<b>" << tr("SUCCESS") << "</b>:<br>\r\n<form action=\"http://shx5vqsw7usdaunyzr2qmes2fq37oumybpudrd4jjj4e4vk4uusa.b32.i2p/add\" method=\"post\" rel=\"noreferrer\" target=\"_blank\">\r\n"
 						     "<textarea readonly name=\"record\" cols=\"80\" rows=\"10\">" << out.str () << "</textarea>\r\n<br>\r\n<br>\r\n"
@@ -1433,7 +1432,6 @@ namespace http {
 						     "<input type=\"submit\" value=\"" << tr("Submit") << "\">\r\n"
 						     "</form>\r\n<br>\r\n";
 						delete[] signature;
-						delete[] sig;
 					}
 					else
 						s << "<b>" << tr("ERROR") << "</b>:&nbsp;" << tr("Domain can't end with .b32.i2p") << "\r\n<br>\r\n<br>\r\n";
@@ -1462,7 +1460,7 @@ namespace http {
 		else
 		{
 			res.code = 400;
-			ShowError(s, tr("Unknown command") + ": " + cmd);
+			ShowError(s, std::string (tr("Unknown command")) + ": " + cmd); // TODO
 			return;
 		}
 

daemon/I2PControl.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -15,7 +15,6 @@
 // Use global placeholders from boost introduced when local_time.hpp is loaded
 #define BOOST_BIND_GLOBAL_PLACEHOLDERS
 #include <boost/property_tree/json_parser.hpp>
-#include <boost/lexical_cast.hpp>
 
 #include "FS.h"
 #include "Log.h"
@@ -30,11 +29,24 @@ namespace i2p
 namespace client
 {
 	I2PControlService::I2PControlService (const std::string& address, int port):
-		m_IsRunning (false), m_Thread (nullptr),
+		m_IsRunning (false),	
-		m_Acceptor (m_Service, boost::asio::ip::tcp::endpoint(boost::asio::ip::make_address(address), port)),
 		m_SSLContext (boost::asio::ssl::context::sslv23),
 		m_ShutdownTimer (m_Service)
 	{
+		if (port)		
+			m_Acceptor = std::make_unique<boost::asio::ip::tcp::acceptor>(m_Service,
+				boost::asio::ip::tcp::endpoint(boost::asio::ip::make_address(address), port));
+		else
+#if defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
+		{		
+			std::remove (address.c_str ());	// just in case
+			m_LocalAcceptor = std::make_unique<boost::asio::local::stream_protocol::acceptor>(m_Service,
+				boost::asio::local::stream_protocol::endpoint(address));	
+		}	
+#else
+			LogPrint(eLogError, "I2PControl: Local sockets are not supported");
+#endif				
+				
 		i2p::config::GetOption("i2pcontrol.password", m_Password);
 
 		// certificate / keys
@@ -98,7 +110,7 @@ namespace client
 		{
 			Accept ();
 			m_IsRunning = true;
-			m_Thread = new std::thread (std::bind (&I2PControlService::Run, this));
+			m_Thread = std::make_unique<std::thread>(std::bind (&I2PControlService::Run, this));
 		}
 	}
 
@@ -107,12 +119,19 @@ namespace client
 		if (m_IsRunning)
 		{
 			m_IsRunning = false;
-			m_Acceptor.cancel ();
+			if (m_Acceptor) m_Acceptor->cancel ();
+#if defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
+			if (m_LocalAcceptor) 
+			{
+				auto path = m_LocalAcceptor->local_endpoint().path();
+				m_LocalAcceptor->cancel ();
+				std::remove (path.c_str ());
+			}	
+#endif			
 			m_Service.stop ();
 			if (m_Thread)
 			{
 				m_Thread->join ();
-				delete m_Thread;
 				m_Thread = nullptr;
 			}
 		}
@@ -134,40 +153,60 @@ namespace client
 
 	void I2PControlService::Accept ()
 	{
-		auto newSocket = std::make_shared<ssl_socket> (m_Service, m_SSLContext);
+		if (m_Acceptor)
-		m_Acceptor.async_accept (newSocket->lowest_layer(), std::bind (&I2PControlService::HandleAccept, this,
+		{	
-			std::placeholders::_1, newSocket));
+			auto newSocket = std::make_shared<boost::asio::ssl::stream<boost::asio::ip::tcp::socket> > (m_Service, m_SSLContext);
+			m_Acceptor->async_accept (newSocket->lowest_layer(),
+				[this, newSocket](const boost::system::error_code& ecode)
+				{
+					HandleAccepted (ecode, newSocket);
+				});		
+		}	
+#if defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
+		else if (m_LocalAcceptor)
+		{
+			auto newSocket = std::make_shared<boost::asio::ssl::stream<boost::asio::local::stream_protocol::socket> > (m_Service, m_SSLContext);
+			m_LocalAcceptor->async_accept (newSocket->lowest_layer(),
+				[this, newSocket](const boost::system::error_code& ecode)
+				{
+					HandleAccepted (ecode, newSocket);
+				});		
+		}	
+#endif		
 	}
 
-	void I2PControlService::HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<ssl_socket> socket)
+	template<typename ssl_socket> 
+	void I2PControlService::HandleAccepted (const boost::system::error_code& ecode,
+		std::shared_ptr<ssl_socket> newSocket)
 	{
 		if (ecode != boost::asio::error::operation_aborted)
 			Accept ();
 
-		if (ecode) {
+		if (ecode) 
+		{
 			LogPrint (eLogError, "I2PControl: Accept error: ", ecode.message ());
 			return;
 		}
-		LogPrint (eLogDebug, "I2PControl: New request from ", socket->lowest_layer ().remote_endpoint ());
+		LogPrint (eLogDebug, "I2PControl: New request from ", newSocket->lowest_layer ().remote_endpoint ());
-		Handshake (socket);
+		Handshake (newSocket);
 	}	
 		
+	template<typename ssl_socket>
 	void I2PControlService::Handshake (std::shared_ptr<ssl_socket> socket)
 	{
 		socket->async_handshake(boost::asio::ssl::stream_base::server,
-		std::bind( &I2PControlService::HandleHandshake, this, std::placeholders::_1, socket));
+			[this, socket](const boost::system::error_code& ecode)
-	}
+		    {
-
+				if (ecode) 
-	void I2PControlService::HandleHandshake (const boost::system::error_code& ecode, std::shared_ptr<ssl_socket> socket)
+				{
-	{
+					LogPrint (eLogError, "I2PControl: Handshake error: ", ecode.message ());
-		if (ecode) {
+					return;
-			LogPrint (eLogError, "I2PControl: Handshake error: ", ecode.message ());
+				}
-			return;
+				ReadRequest (socket);
-		}
+			});			                        
-		//std::this_thread::sleep_for (std::chrono::milliseconds(5));
-		ReadRequest (socket);
 	}
 
+	template<typename ssl_socket>
 	void I2PControlService::ReadRequest (std::shared_ptr<ssl_socket> socket)
 	{
 		auto request = std::make_shared<I2PControlBuffer>();
@@ -177,10 +216,13 @@ namespace client
 #else
 			boost::asio::buffer (request->data (), request->size ()),
 #endif
-			std::bind(&I2PControlService::HandleRequestReceived, this,
+		    [this, socket, request](const boost::system::error_code& ecode, size_t bytes_transferred)
-			std::placeholders::_1, std::placeholders::_2, socket, request));
+		    {
+				HandleRequestReceived (ecode, bytes_transferred, socket, request);
+			});
 	}
 
+	template<typename ssl_socket>
 	void I2PControlService::HandleRequestReceived (const boost::system::error_code& ecode,
 		size_t bytes_transferred, std::shared_ptr<ssl_socket> socket,
 		std::shared_ptr<I2PControlBuffer> buf)
@@ -258,6 +300,7 @@ namespace client
 		}
 	}
 
+	template<typename ssl_socket>
 	void I2PControlService::SendResponse (std::shared_ptr<ssl_socket> socket,
 		std::shared_ptr<I2PControlBuffer> buf, std::ostringstream& response, bool isHtml)
 	{
@@ -267,7 +310,7 @@ namespace client
 			std::ostringstream header;
 			header << "HTTP/1.1 200 OK\r\n";
 			header << "Connection: close\r\n";
-			header << "Content-Length: " << boost::lexical_cast<std::string>(len) << "\r\n";
+			header << "Content-Length: " << std::to_string(len) << "\r\n";
 			header << "Content-Type: application/json\r\n";
 			header << "Date: ";
 			std::time_t t = std::time (nullptr);
@@ -280,16 +323,11 @@ namespace client
 		memcpy (buf->data () + offset, response.str ().c_str (), len);
 		boost::asio::async_write (*socket, boost::asio::buffer (buf->data (), offset + len),
 			boost::asio::transfer_all (),
-			std::bind(&I2PControlService::HandleResponseSent, this,
+		    [socket, buf](const boost::system::error_code& ecode, std::size_t bytes_transferred)
-				std::placeholders::_1, std::placeholders::_2, socket, buf));
+		    {
-	}
+				if (ecode)
-
+					LogPrint (eLogError, "I2PControl: Write error: ", ecode.message ());
-	void I2PControlService::HandleResponseSent (const boost::system::error_code& ecode, std::size_t bytes_transferred,
+			});	
-		std::shared_ptr<ssl_socket> socket, std::shared_ptr<I2PControlBuffer> buf)
-	{
-		if (ecode) {
-			LogPrint (eLogError, "I2PControl: Write error: ", ecode.message ());
-		}
 	}
 
 // handlers

daemon/I2PControl.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -35,8 +35,6 @@ namespace client
 
 	class I2PControlService: public I2PControlHandlers
 	{
-		typedef boost::asio::ssl::stream<boost::asio::ip::tcp::socket> ssl_socket;
-
 		public:
 
 			I2PControlService (const std::string& address, int port);
@@ -49,16 +47,18 @@ namespace client
 
 			void Run ();
 			void Accept ();
-			void HandleAccept(const boost::system::error_code& ecode, std::shared_ptr<ssl_socket> socket);
+			template<typename ssl_socket> 
+			void HandleAccepted (const boost::system::error_code& ecode, std::shared_ptr<ssl_socket> newSocket);
+			template<typename ssl_socket>
 			void Handshake (std::shared_ptr<ssl_socket> socket);
-			void HandleHandshake (const boost::system::error_code& ecode, std::shared_ptr<ssl_socket> socket);
+			template<typename ssl_socket>
 			void ReadRequest (std::shared_ptr<ssl_socket> socket);
+			template<typename ssl_socket>
 			void HandleRequestReceived (const boost::system::error_code& ecode, size_t bytes_transferred,
 				std::shared_ptr<ssl_socket> socket, std::shared_ptr<I2PControlBuffer> buf);
+			template<typename ssl_socket>
 			void SendResponse (std::shared_ptr<ssl_socket> socket,
 				std::shared_ptr<I2PControlBuffer> buf, std::ostringstream& response, bool isHtml);
-			void HandleResponseSent (const boost::system::error_code& ecode, std::size_t bytes_transferred,
-				std::shared_ptr<ssl_socket> socket, std::shared_ptr<I2PControlBuffer> buf);
 
 			void CreateCertificate (const char *crt_path, const char *key_path);
 
@@ -86,10 +86,13 @@ namespace client
 
 			std::string m_Password;
 			bool m_IsRunning;
-			std::thread * m_Thread;
+			std::unique_ptr<std::thread> m_Thread;
 
 			boost::asio::io_context m_Service;
-			boost::asio::ip::tcp::acceptor m_Acceptor;
+			std::unique_ptr<boost::asio::ip::tcp::acceptor> m_Acceptor;
+#if defined(BOOST_ASIO_HAS_LOCAL_SOCKETS)
+			std::unique_ptr<boost::asio::local::stream_protocol::acceptor> m_LocalAcceptor;
+#endif		
 			boost::asio::ssl::context m_SSLContext;
 			boost::asio::deadline_timer m_ShutdownTimer;
 			std::set<std::string> m_Tokens;

debian/changelog

@@ -1,3 +1,9 @@
+i2pd (2.56.0-1) unstable; urgency=medium
+
+  * updated to version 2.56.0/0.9.65
+
+ -- orignal <orignal@i2pmail.org>  Tue, 11 Feb 2025 16:00:00 +0000
+
 i2pd (2.55.0-1) unstable; urgency=medium
 
   * updated to version 2.55.0

i18n/Afrikaans.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2021, The PurpleI2P Project
+* Copyright (c) 2021-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace afrikaans // language namespace
 		return n != 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"failed", "Het misluk"},
 		{"unknown", "onbekend"},

i18n/Armenian.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2021-2023, The PurpleI2P Project
+* Copyright (c) 2021-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace armenian // language namespace
 		return n != 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f ԿիԲ"},
 		{"%.2f MiB", "%.2f ՄիԲ"},

i18n/Chinese.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2024, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace chinese // language namespace
 		return 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f KiB"},
 		{"%.2f MiB", "%.2f MiB"},

i18n/Czech.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2024, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace czech // language namespace
 		return (n == 1) ? 0 : (n >= 2 && n <= 4) ? 1 : 2;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f KiB"},
 		{"%.2f MiB", "%.2f MiB"},

i18n/English.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2021, The PurpleI2P Project
+* Copyright (c) 2021-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -30,7 +30,7 @@ namespace english // language namespace
 		return n != 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"", ""},
 	};

i18n/French.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2024, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace french // language namespace
 		return n != 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f Kio"},
 		{"%.2f MiB", "%.2f Mio"},

i18n/German.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2023, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace german // language namespace
 		return n != 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f KiB"},
 		{"%.2f MiB", "%.2f MiB"},

i18n/I18N.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2021-2023, The PurpleI2P Project
+* Copyright (c) 2021-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -30,12 +30,12 @@ namespace i18n
 		}
 	}
 
-	std::string translate (const std::string& arg)
+	std::string_view translate (std::string_view arg)
 	{
 		return i2p::client::context.GetLanguage ()->GetString (arg);
 	}
 
-	std::string translate (const std::string& arg, const std::string& arg2, const int& n)
+	std::string translate (const std::string& arg, const std::string& arg2, const int n)
 	{
 		return i2p::client::context.GetLanguage ()->GetPlural (arg, arg2, n);
 	}

i18n/I18N.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2021-2023, The PurpleI2P Project
+* Copyright (c) 2021-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -10,6 +10,7 @@
 #define __I18N_H__
 
 #include <string>
+#include <string_view>
 #include <map>
 #include <utility>
 #include <functional>
@@ -18,12 +19,13 @@ namespace i2p
 {
 namespace i18n
 {
+	typedef std::map<std::string_view, std::string_view> LocaleStrings; 
 	class Locale
 	{
 		public:
 			Locale (
 				const std::string& language,
-				const std::map<std::string, std::string>& strings,
+				const LocaleStrings& strings,
 				const std::map<std::string, std::vector<std::string>>& plurals,
 				std::function<int(int)> formula
 			): m_Language (language), m_Strings (strings), m_Plurals (plurals), m_Formula (formula) { };
@@ -34,7 +36,7 @@ namespace i18n
 				return m_Language;
 			}
 
-			std::string GetString (const std::string& arg) const
+			std::string_view GetString (std::string_view arg) const
 			{
 				const auto it = m_Strings.find(arg);
 				if (it == m_Strings.end())
@@ -47,7 +49,7 @@ namespace i18n
 				}
 			}
 
-			std::string GetPlural (const std::string& arg, const std::string& arg2, const int& n) const
+			std::string GetPlural (const std::string& arg, const std::string& arg2, int n) const
 			{
 				const auto it = m_Plurals.find(arg2);
 				if (it == m_Plurals.end()) // not found, fallback to english
@@ -63,14 +65,14 @@ namespace i18n
 
 		private:
 			const std::string m_Language;
-			const std::map<std::string, std::string> m_Strings;
+			const LocaleStrings m_Strings;
 			const std::map<std::string, std::vector<std::string>> m_Plurals;
 			std::function<int(int)> m_Formula;
 	};
 
 	void SetLanguage(const std::string &lang);
-	std::string translate (const std::string& arg);
+	std::string_view translate (std::string_view arg);
-	std::string translate (const std::string& arg, const std::string& arg2, const int& n);
+	std::string translate (const std::string& arg, const std::string& arg2, int n);
 } // i18n
 } // i2p
 
@@ -79,7 +81,7 @@ namespace i18n
  * @param arg String with message
  */
 template<typename TValue>
-std::string tr (TValue&& arg)
+std::string_view tr (TValue&& arg)
 {
 	return i2p::i18n::translate(std::forward<TValue>(arg));
 }
@@ -92,7 +94,7 @@ std::string tr (TValue&& arg)
 template<typename TValue, typename... TArgs>
 std::string tr (TValue&& arg, TArgs&&... args)
 {
-	std::string tr_str = i2p::i18n::translate(std::forward<TValue>(arg));
+	std::string tr_str = std::string (i2p::i18n::translate(std::forward<TValue>(arg))); // TODO:
 
 	size_t size = std::snprintf(NULL, 0, tr_str.c_str(), std::forward<TArgs>(args)...);
 	std::string str(size, 0);
@@ -108,7 +110,7 @@ std::string tr (TValue&& arg, TArgs&&... args)
  * @param n Integer, used for selection of form
  */
 template<typename TValue, typename TValue2>
-std::string ntr (TValue&& arg, TValue2&& arg2, int& n)
+std::string ntr (TValue&& arg, TValue2&& arg2, int n)
 {
 	return i2p::i18n::translate(std::forward<TValue>(arg), std::forward<TValue2>(arg2), std::forward<int>(n));
 }
@@ -121,7 +123,7 @@ std::string ntr (TValue&& arg, TValue2&& arg2, int& n)
  * @param args Array of arguments for string formatting
  */
 template<typename TValue, typename TValue2, typename... TArgs>
-std::string ntr (TValue&& arg, TValue2&& arg2, int& n, TArgs&&... args)
+std::string ntr (TValue&& arg, TValue2&& arg2, int n, TArgs&&... args)
 {
 	std::string tr_str = i2p::i18n::translate(std::forward<TValue>(arg), std::forward<TValue2>(arg2), std::forward<int>(n));
 

i18n/Italian.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2023, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace italian // language namespace
 		return n != 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f KiB"},
 		{"%.2f MiB", "%.2f MiB"},

i18n/Polish.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2023-2024, The PurpleI2P Project
+* Copyright (c) 2023-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace polish // language namespace
 		return (n == 1 ? 0 : n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2);
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f KiB"},
 		{"%.2f MiB", "%.2f MiB"},

i18n/Portuguese.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2023-2024, The PurpleI2P Project
+* Copyright (c) 2023-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace portuguese // language namespace
 		return n != 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f KiB"},
 		{"%.2f MiB", "%.2f MiB"},

i18n/Russian.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2021-2023, The PurpleI2P Project
+* Copyright (c) 2021-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace russian // language namespace
 		return n % 10 == 1 && n % 100 != 11 ? 0 : n % 10 >= 2 && n % 10 <= 4 && (n % 100 < 10 || n % 100 >= 20) ? 1 : 2;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f КиБ"},
 		{"%.2f MiB", "%.2f МиБ"},

i18n/Spanish.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2023, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace spanish // language namespace
 		return n != 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f KiB"},
 		{"%.2f MiB", "%.2f MiB"},

i18n/Swedish.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2023, The PurpleI2P Project
+* Copyright (c) 2023-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace swedish // language namespace
 		return n != 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f KiB"},
 		{"%.2f MiB", "%.2f MiB"},

i18n/Turkish.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2023, The PurpleI2P Project
+* Copyright (c) 2023-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace turkish // language namespace
 		return n != 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f KiB"},
 		{"%.2f MiB", "%.2f MiB"},

i18n/Turkmen.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2021-2023, The PurpleI2P Project
+* Copyright (c) 2021-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace turkmen // language namespace
 		return n != 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f KiB"},
 		{"%.2f MiB", "%.2f MiB"},

i18n/Ukrainian.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2021-2023, The PurpleI2P Project
+* Copyright (c) 2021-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace ukrainian // language namespace
 		return n%10==1 && n%100!=11 ? 0 : n%10>=2 && n%10<=4 && (n%100<10 || n%100>=20) ? 1 : 2;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f КіБ"},
 		{"%.2f MiB", "%.2f МіБ"},

i18n/Uzbek.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2021-2023, The PurpleI2P Project
+* Copyright (c) 2021-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -29,7 +29,7 @@ namespace uzbek // language namespace
 		return n > 1 ? 1 : 0;
 	}
 
-	static std::map<std::string, std::string> strings
+	static const LocaleStrings strings
 	{
 		{"%.2f KiB", "%.2f KiB"},
 		{"%.2f MiB", "%.2f MiB"},

libi2pd/Base.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -15,7 +15,7 @@ namespace i2p
 {
 namespace data
 {
-	static const char T32[32] =
+	static constexpr char T32[32] =
 	{
 		'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
 		'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p',
@@ -28,11 +28,6 @@ namespace data
 		return T32;
 	}
 	
-	bool IsBase32 (char ch)
-	{
-		return (ch >= 'a' && ch <= 'z') || (ch >= '2' && ch <= '7');
-	}	
-	
 	static void iT64Build(void);
 
 	/*
@@ -43,7 +38,7 @@ namespace data
 	* Direct Substitution Table
 	*/
 
-	static const char T64[64] =
+	static constexpr char T64[64] =
 	{
 		'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
 		'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
@@ -60,23 +55,16 @@ namespace data
 		return T64;
 	}
 	
-	bool IsBase64 (char ch)
-	{
-		return (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') || (ch >= '0' && ch <= '9') || ch == '-' || ch == '~';
-	}	
-	
 	/*
 	* Reverse Substitution Table (built in run time)
 	*/
-
 	static char iT64[256];
 	static int isFirstTime = 1;
 
 	/*
 	* Padding
 	*/
-
+	static constexpr char P64 = '=';
-	static char P64 = '=';
 
 	/*
 	*
@@ -86,78 +74,69 @@ namespace data
 	* Converts binary encoded data to BASE64 format.
 	*
 	*/
-
+	std::string ByteStreamToBase64 (// base64 encoded string 
-	size_t ByteStreamToBase64 (   /* Number of bytes in the encoded buffer */
+		const uint8_t * InBuffer, 	// Input buffer, binary data 
-		const uint8_t * InBuffer, /* Input buffer, binary data */
+	    size_t InCount 				// Number of bytes in the input buffer 
-		size_t InCount,           /* Number of bytes in the input buffer */
-		char * OutBuffer,         /* output buffer */
-		size_t len                /* length of output buffer */
 	)
 	{
 		unsigned char * ps;
-		unsigned char * pd;
 		unsigned char   acc_1;
 		unsigned char   acc_2;
 		int             i;
 		int             n;
 		int             m;
-		size_t          outCount;
 
 		ps = (unsigned char *)InBuffer;
 		n = InCount / 3;
 		m = InCount % 3;
-		if (!m)
+		size_t outCount = m ? (4 * (n + 1)) : (4 * n);
-			outCount = 4 * n;
-		else
-			outCount = 4 * (n + 1);
 
-		if (outCount > len) return 0;
+		std::string out;
-
+		out.reserve (outCount);
-		pd = (unsigned char *)OutBuffer;
 		for ( i = 0; i < n; i++ )
 		{
 			acc_1 = *ps++;
 			acc_2 = (acc_1 << 4) & 0x30;
-			acc_1 >>= 2;                 /* base64 digit #1 */
+			acc_1 >>= 2;                 // base64 digit #1 
-			*pd++ = T64[acc_1];
+			out.push_back (T64[acc_1]);
 			acc_1 = *ps++;
-			acc_2 |= acc_1 >> 4;         /* base64 digit #2 */
+			acc_2 |= acc_1 >> 4;         // base64 digit #2
-			*pd++ = T64[acc_2];
+			out.push_back (T64[acc_2]);
 			acc_1 &= 0x0f;
 			acc_1 <<= 2;
 			acc_2 = *ps++;
-			acc_1 |= acc_2 >> 6;         /* base64 digit #3 */
+			acc_1 |= acc_2 >> 6;         // base64 digit #3
-			*pd++ = T64[acc_1];
+			out.push_back (T64[acc_1]);
-			acc_2 &= 0x3f;               /* base64 digit #4 */
+			acc_2 &= 0x3f;               // base64 digit #4
-			*pd++ = T64[acc_2];
+			out.push_back (T64[acc_2]);
 		}
 		if ( m == 1 )
 		{
 			acc_1 = *ps++;
-			acc_2 = (acc_1 << 4) & 0x3f; /* base64 digit #2 */
+			acc_2 = (acc_1 << 4) & 0x3f; // base64 digit #2
-			acc_1 >>= 2;                 /* base64 digit #1 */
+			acc_1 >>= 2;                 // base64 digit #1
-			*pd++ = T64[acc_1];
+			out.push_back (T64[acc_1]);
-			*pd++ = T64[acc_2];
+			out.push_back (T64[acc_2]);
-			*pd++ = P64;
+			out.push_back (P64);
-			*pd++ = P64;
+			out.push_back (P64);
 
 		}
 		else if ( m == 2 )
 		{
 			acc_1 = *ps++;
 			acc_2 = (acc_1 << 4) & 0x3f;
-			acc_1 >>= 2;                 /* base64 digit #1 */
+			acc_1 >>= 2;                 // base64 digit #1
-			*pd++ = T64[acc_1];
+			out.push_back (T64[acc_1]);
 			acc_1 = *ps++;
-			acc_2 |= acc_1 >> 4;         /* base64 digit #2 */
+			acc_2 |= acc_1 >> 4;         // base64 digit #2
-			*pd++ = T64[acc_2];
+			out.push_back (T64[acc_2]);
 			acc_1 &= 0x0f;
-			acc_1 <<= 2;                 /* base64 digit #3 */
+			acc_1 <<= 2;                 // base64 digit #3
-			*pd++ = T64[acc_1];
+			out.push_back (T64[acc_1]);
-			*pd++ = P64;
+			out.push_back (P64);
 		}
 
-		return outCount;
+		return out;
 	}	
 	
 	/*
@@ -165,55 +144,42 @@ namespace data
 	* Base64ToByteStream
 	* ------------------
 	*
-	* Converts BASE64 encoded data to binary format. If input buffer is
+	* Converts BASE64 encoded string to binary format. If input buffer is
 	* not properly padded, buffer of negative length is returned
 	*
 	*/
-
+	size_t Base64ToByteStream (		// Number of output bytes 
-	size_t Base64ToByteStream ( /* Number of output bytes */
+		std::string_view base64Str,	// BASE64 encoded string  
-		const char * InBuffer,  /* BASE64 encoded buffer */
+	    uint8_t * OutBuffer, 		// output buffer length 
-		size_t InCount,         /* Number of input bytes */
+	    size_t len					// length of output buffer 
-		uint8_t * OutBuffer,    /* output buffer length */
-		size_t len              /* length of output buffer */
 	)
 	{
-		unsigned char * ps;
 		unsigned char * pd;
 		unsigned char   acc_1;
 		unsigned char   acc_2;
-		int             i;
-		int             n;
-		int             m;
 		size_t          outCount;
 
-		if (isFirstTime)
+		if (base64Str.empty () || base64Str[0] == P64) return 0;
-			iT64Build();
+		auto d = std::div (base64Str.length (), 4);
-
+		if (!d.rem)
-		n = InCount / 4;
+			outCount = 3 * d.quot;
-		m = InCount % 4;
-
-		if (InCount && !m)
-			outCount = 3 * n;
 		else
 			return 0;
 
-		if(*InBuffer == P64)
+		if (isFirstTime) iT64Build();
-			return 0;
 
-		ps = (unsigned char *)(InBuffer + InCount - 1);
+		auto pos = base64Str.find_last_not_of (P64);
-		while ( *ps-- == P64 )
+		if (pos == base64Str.npos) return 0;
-			outCount--;
+		outCount -= (base64Str.length () - pos - 1);
-		ps = (unsigned char *)InBuffer;
+		if (outCount > len) return 0;
-
-		if (outCount > len)
-			return 0;
 		
+		auto ps = base64Str.begin ();
 		pd = OutBuffer;
 		auto endOfOutBuffer = OutBuffer + outCount;
-		for ( i = 0; i < n; i++ )
+		for (int i = 0; i < d.quot; i++)
 		{
-			acc_1 = iT64[*ps++];
+			acc_1 = iT64[int(*ps++)];
-			acc_2 = iT64[*ps++];
+			acc_2 = iT64[int(*ps++)];
 			acc_1 <<= 2;
 			acc_1 |= acc_2 >> 4;
 			*pd++ = acc_1;
@@ -221,13 +187,13 @@ namespace data
 				break;
 
 			acc_2 <<= 4;
-			acc_1 = iT64[*ps++];
+			acc_1 = iT64[int(*ps++)];
 			acc_2 |= acc_1 >> 2;
 			*pd++ = acc_2;
 			if (pd >= endOfOutBuffer)
 				break;
 
-			acc_2 = iT64[*ps++];
+			acc_2 = iT64[int(*ps++)];
 			acc_2 |= acc_1 << 6;
 			*pd++ = acc_2;
 		}
@@ -235,31 +201,16 @@ namespace data
 		return outCount;
 	}	
 	
-	size_t Base64EncodingBufferSize (const size_t input_size)
+	std::string ToBase64Standard (std::string_view in)
 	{
-		auto d = div (input_size, 3);
+		auto str = ByteStreamToBase64 ((const uint8_t *)in.data (), in.length ());
-		if (d.rem)
-			d.quot++;
-
-		return 4 * d.quot;
-	}
-
-	std::string ToBase64Standard (const std::string& in)
-	{
-		auto len = Base64EncodingBufferSize (in.length ());
-		char * str = new char[len + 1];
-		auto l = ByteStreamToBase64 ((const uint8_t *)in.c_str (), in.length (), str, len);
-		str[l] = 0;
 		// replace '-' by '+' and '~' by '/'
-		for (size_t i = 0; i < l; i++)
+		for (auto& ch: str)
-			if (str[i] == '-')
+			if (ch == '-')
-				str[i] = '+';
+				ch = '+';
-			else if (str[i] == '~')
+			else if (ch == '~')
-				str[i] = '/';
+				ch = '/';
-
+		return str;
-		std::string s(str);
-		delete[] str;
-		return s;
 	}
 
 	/*
@@ -280,13 +231,12 @@ namespace data
 		iT64[(int)P64] = 0;
 	}
 
-	size_t Base32ToByteStream (const char * inBuf, size_t len, uint8_t * outBuf, size_t outLen)
+	size_t Base32ToByteStream (std::string_view base32Str, uint8_t * outBuf, size_t outLen)
 	{
 		unsigned int tmp = 0, bits = 0;
 		size_t ret = 0;
-		for (size_t i = 0; i < len; i++)
+		for (auto ch: base32Str)
 		{
-			char ch = inBuf[i];
 			if (ch >= '2' && ch <= '7') // digit
 				ch = (ch - '2') + 26; // 26 means a-z
 			else if (ch >= 'a' && ch <= 'z')
@@ -308,11 +258,13 @@ namespace data
 		return ret;
 	}	
 	
-	size_t ByteStreamToBase32 (const uint8_t * inBuf, size_t len, char * outBuf, size_t outLen)
+	std::string ByteStreamToBase32 (const uint8_t * inBuf, size_t len)
 	{
-		size_t ret = 0, pos = 1;
+		std::string out;
+		out.reserve ((len * 8 + 4) / 5);
+		size_t pos = 1;
 		unsigned int bits = 8, tmp = inBuf[0];
-		while (ret < outLen && (bits > 0 || pos < len))
+		while (bits > 0 || pos < len)
 		{
 			if (bits < 5)
 			{
@@ -332,10 +284,9 @@ namespace data
 
 			bits -= 5;
 			int ind = (tmp >> bits) & 0x1F;
-			outBuf[ret] = (ind < 26) ? (ind + 'a') : ((ind - 26) + '2');
+			out.push_back ((ind < 26) ? (ind + 'a') : ((ind - 26) + '2'));
-			ret++;
 		}
-		return ret;
+		return out;
 	}	
 }
 }

libi2pd/Base.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,26 +11,41 @@
 
 #include <inttypes.h>
 #include <string>
-#include <iostream>
+#include <string_view>
+#include <cstdlib>
+
+namespace i2p 
+{
+namespace data 
+{
+	std::string ByteStreamToBase64 (const uint8_t * InBuffer, size_t InCount);
+	size_t Base64ToByteStream (std::string_view base64Str, uint8_t * OutBuffer, size_t len);
 
-namespace i2p {
-namespace data {
-	size_t ByteStreamToBase64 (const uint8_t * InBuffer, size_t InCount, char * OutBuffer, size_t len);
-	size_t Base64ToByteStream (const char * InBuffer, size_t InCount, uint8_t * OutBuffer, size_t len );
 	const char * GetBase32SubstitutionTable ();
 	const char * GetBase64SubstitutionTable ();
-	bool IsBase64 (char ch);
+	constexpr bool IsBase64 (char ch)
+	{
+		return (ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z') || (ch >= '0' && ch <= '9') || ch == '-' || ch == '~';
+	}	
 
-	size_t Base32ToByteStream (const char * inBuf, size_t len, uint8_t * outBuf, size_t outLen);
+	size_t Base32ToByteStream (std::string_view base32Str, uint8_t * outBuf, size_t outLen);
-	size_t ByteStreamToBase32 (const uint8_t * InBuf, size_t len, char * outBuf, size_t outLen);
+	std::string ByteStreamToBase32 (const uint8_t * inBuf, size_t len);	
-	bool IsBase32 (char ch);
+	constexpr bool IsBase32 (char ch)
+	{
+		return (ch >= 'a' && ch <= 'z') || (ch >= '2' && ch <= '7');
+	}	
 
 	/**
 	 * Compute the size for a buffer to contain encoded base64 given that the size of the input is input_size bytes
 	 */
-	size_t Base64EncodingBufferSize(const size_t input_size);
+	inline size_t Base64EncodingBufferSize(size_t input_size)
+	{
+		auto d = std::div (input_size, 3);
+		if (d.rem) d.quot++;
+		return 4 * d.quot;
+	}	
 
-	std::string ToBase64Standard (const std::string& in); // using standard table, for Proxy-Authorization
+	std::string ToBase64Standard (std::string_view in); // using standard table, for Proxy-Authorization
 	
 } // data
 } // i2p

libi2pd/Blinding.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2022, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -152,11 +152,11 @@ namespace data
 			m_BlindedSigType = m_SigType;
 	}
 
-	BlindedPublicKey::BlindedPublicKey (const std::string& b33):
+	BlindedPublicKey::BlindedPublicKey (std::string_view b33):
 		m_SigType (0) // 0 means invalid, we can't blind DSA, set it later
 	{
 		uint8_t addr[40]; // TODO: define length from b33
-		size_t l = i2p::data::Base32ToByteStream (b33.c_str (), b33.length (), addr, 40);
+		size_t l = i2p::data::Base32ToByteStream (b33, addr, 40);
 		if (l < 32)
 		{
 			LogPrint (eLogError, "Blinding: Malformed b33 ", b33);
@@ -198,7 +198,7 @@ namespace data
 	std::string BlindedPublicKey::ToB33 () const
 	{
 		if (m_PublicKey.size () > 32) return ""; // assume 25519
-		uint8_t addr[35]; char str[60]; // TODO: define actual length
+		uint8_t addr[35];
 		uint8_t flags = 0;
 		if (m_IsClientAuth) flags |= B33_PER_CLIENT_AUTH_FLAG;
 		addr[0] = flags; // flags
@@ -208,8 +208,7 @@ namespace data
 		uint32_t checksum = crc32 (0, addr + 3, m_PublicKey.size ());
 		// checksum is Little Endian
 		addr[0] ^= checksum; addr[1] ^= (checksum >> 8); addr[2] ^= (checksum >> 16);
-		auto l = ByteStreamToBase32 (addr, m_PublicKey.size () + 3, str, 60);
+		return ByteStreamToBase32 (addr, m_PublicKey.size () + 3);
-		return std::string (str, str + l);
 	}
 
 	void BlindedPublicKey::GetCredential (uint8_t * credential) const

libi2pd/Blinding.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2020, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,6 +11,7 @@
 
 #include <inttypes.h>
 #include <string>
+#include <string_view>
 #include <vector>
 #include "Identity.h"
 
@@ -23,7 +24,7 @@ namespace data
 		public:
 
 			BlindedPublicKey (std::shared_ptr<const IdentityEx> identity, bool clientAuth = false);
-			BlindedPublicKey (const std::string& b33); // from b33 without .b32.i2p
+			BlindedPublicKey (std::string_view b33); // from b33 without .b32.i2p
 			std::string ToB33 () const;
 
 			const uint8_t * GetPublicKey () const { return m_PublicKey.data (); };

libi2pd/Config.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -154,6 +154,17 @@ namespace config {
 			("socksproxy.i2p.streaming.profile", value<std::string>()->default_value("1"), "SOCKS Proxy bandwidth usage profile. 1 - bulk(high), 2- interactive(low)")
 		;
 
+		options_description shareddest("Shared local destination options");
+		shareddest.add_options()
+			("shareddest.inbound.length", value<std::string>()->default_value("3"),    "Shared local destination inbound tunnel length")
+			("shareddest.outbound.length", value<std::string>()->default_value("3"),   "Shared local destination outbound tunnel length")
+			("shareddest.inbound.quantity", value<std::string>()->default_value("3"),  "Shared local destination inbound tunnels quantity")
+			("shareddest.outbound.quantity", value<std::string>()->default_value("3"), "Shared local destination outbound tunnels quantity")
+			("shareddest.i2cp.leaseSetType", value<std::string>()->default_value("3"), "Shared local destination's LeaseSet type")
+			("shareddest.i2cp.leaseSetEncType", value<std::string>()->default_value("0,4"), "Shared local destination's LeaseSet encryption type")
+			("shareddest.i2p.streaming.profile", value<std::string>()->default_value("2"), "Shared local destination bandwidth usage profile. 1 - bulk(high), 2- interactive(low)")
+		;	
+		
 		options_description sam("SAM bridge options");
 		sam.add_options()
 			("sam.enabled", value<bool>()->default_value(true),               "Enable or disable SAM Application bridge")
@@ -227,7 +238,7 @@ namespace config {
 				"https://reseed.onion.im/,"
 				"https://i2pseed.creativecowpat.net:8443/,"
 				"https://reseed.i2pgit.org/,"
-				"https://banana.incognet.io/,"
+				"https://coconut.incognet.io/,"
 				"https://reseed-pl.i2pd.xyz/,"
 				"https://www2.mk16.de/,"
 			    "https://i2p.ghativega.in/,"
@@ -341,6 +352,7 @@ namespace config {
 			.add(httpserver)
 			.add(httpproxy)
 			.add(socksproxy)
+			.add(shareddest)
 			.add(sam)
 			.add(bob)
 			.add(i2cp)

libi2pd/Crypto.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -19,6 +19,10 @@
 #if OPENSSL_HKDF
 #include <openssl/kdf.h>
 #endif
+#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
+#include <openssl/param_build.h>
+#include <openssl/core_names.h>
+#endif
 #include "CPU.h"
 #include "Crypto.h"
 #include "Ed25519.h"
@@ -29,7 +33,7 @@ namespace i2p
 {
 namespace crypto
 {
-	const uint8_t elgp_[256]=
+	constexpr uint8_t elgp_[256]=
 	{
 		0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34,
 		0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1, 0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74,
@@ -49,9 +53,9 @@ namespace crypto
 		0x15, 0x72, 0x8E, 0x5A, 0x8A, 0xAC, 0xAA, 0x68, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
 	};
 
-	const int elgg_ = 2;
+	constexpr int elgg_ = 2;
 
-	const uint8_t dsap_[128]=
+	constexpr uint8_t dsap_[128]=
 	{
 		0x9c, 0x05, 0xb2, 0xaa, 0x96, 0x0d, 0x9b, 0x97, 0xb8, 0x93, 0x19, 0x63, 0xc9, 0xcc, 0x9e, 0x8c,
 		0x30, 0x26, 0xe9, 0xb8, 0xed, 0x92, 0xfa, 0xd0, 0xa6, 0x9c, 0xc8, 0x86, 0xd5, 0xbf, 0x80, 0x15,
@@ -63,13 +67,13 @@ namespace crypto
 		0x28, 0x5d, 0x4c, 0xf2, 0x95, 0x38, 0xd9, 0xe3, 0xb6, 0x05, 0x1f, 0x5b, 0x22, 0xcc, 0x1c, 0x93
 	};
 
-	const uint8_t dsaq_[20]=
+	constexpr uint8_t dsaq_[20]=
 	{
 		0xa5, 0xdf, 0xc2, 0x8f, 0xef, 0x4c, 0xa1, 0xe2, 0x86, 0x74, 0x4c, 0xd8, 0xee, 0xd9, 0xd2, 0x9d,
 		0x68, 0x40, 0x46, 0xb7
 	};
 
-	const uint8_t dsag_[128]=
+	constexpr uint8_t dsag_[128]=
 	{
 		0x0c, 0x1f, 0x4d, 0x27, 0xd4, 0x00, 0x93, 0xb4, 0x29, 0xe9, 0x62, 0xd7, 0x22, 0x38, 0x24, 0xe0,
 		0xbb, 0xc4, 0x7e, 0x7c, 0x83, 0x2a, 0x39, 0x23, 0x6f, 0xc6, 0x83, 0xaf, 0x84, 0x88, 0x95, 0x81,
@@ -81,7 +85,7 @@ namespace crypto
 		0xb3, 0xdb, 0xb1, 0x4a, 0x90, 0x5e, 0x7b, 0x2b, 0x3e, 0x93, 0xbe, 0x47, 0x08, 0xcb, 0xcc, 0x82
 	};
 
-	const int rsae_ = 65537;
+	constexpr int rsae_ = 65537;
 
 	struct CryptoConstants
 	{
@@ -146,6 +150,37 @@ namespace crypto
 	#define dsap GetCryptoConstants ().dsap
 	#define dsaq GetCryptoConstants ().dsaq
 	#define dsag GetCryptoConstants ().dsag
+#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
+	EVP_PKEY * CreateDSA (BIGNUM * pubKey, BIGNUM * privKey)
+	{
+		EVP_PKEY * pkey = nullptr;
+		int selection = EVP_PKEY_KEY_PARAMETERS;
+		auto bld = OSSL_PARAM_BLD_new();
+		OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_P, dsap);
+		OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_Q, dsaq);
+		OSSL_PARAM_BLD_push_BN(bld, OSSL_PKEY_PARAM_FFC_G, dsag);
+		if (pubKey)
+		{	
+			OSSL_PARAM_BLD_push_BN (bld, OSSL_PKEY_PARAM_PUB_KEY, pubKey);
+			selection = EVP_PKEY_PUBLIC_KEY;
+		}	
+		if (privKey)
+		{	
+			OSSL_PARAM_BLD_push_BN (bld, OSSL_PKEY_PARAM_PRIV_KEY, privKey);
+			selection = EVP_PKEY_KEYPAIR;
+		}	
+		auto params = OSSL_PARAM_BLD_to_param(bld);
+		
+		EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new_from_name (NULL, "DSA", NULL);
+		EVP_PKEY_fromdata_init(ctx);
+        EVP_PKEY_fromdata(ctx, &pkey, selection, params);
+		
+		EVP_PKEY_CTX_free(ctx);
+		OSSL_PARAM_free(params);
+		OSSL_PARAM_BLD_free(bld);
+		return pkey;
+	}	
+#else	
 	DSA * CreateDSA ()
 	{
 		DSA * dsa = DSA_new ();
@@ -153,6 +188,7 @@ namespace crypto
 		DSA_set0_key (dsa, NULL, NULL);
 		return dsa;
 	}
+#endif
 	
 // DH/ElGamal
 
@@ -711,18 +747,40 @@ namespace crypto
 		return AEADChaCha20Poly1305 (m_Ctx, msg, msgLen, ad, adLen, key, nonce, buf, len, false);
 	}
 
-	void ChaCha20 (const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out)
+	static void ChaCha20 (EVP_CIPHER_CTX *ctx, const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out)
 	{
-		EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new ();
 		uint32_t iv[4];
 		iv[0] = htole32 (1); memcpy (iv + 1, nonce, 12); // counter | nonce
 		EVP_EncryptInit_ex(ctx, EVP_chacha20 (), NULL, key, (const uint8_t *)iv);
 		int outlen = 0;
 		EVP_EncryptUpdate(ctx, out, &outlen, msg, msgLen);
 		EVP_EncryptFinal_ex(ctx, NULL, &outlen);
+	}
+	
+	void ChaCha20 (const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out)
+	{
+		EVP_CIPHER_CTX *ctx = EVP_CIPHER_CTX_new ();
+		ChaCha20 (ctx, msg, msgLen, key, nonce, out);
 		EVP_CIPHER_CTX_free (ctx);
 	}
 
+	
+	ChaCha20Context::ChaCha20Context ()
+	{
+		m_Ctx = EVP_CIPHER_CTX_new ();
+	}
+	
+	ChaCha20Context::~ChaCha20Context ()
+	{
+		if (m_Ctx)
+			EVP_CIPHER_CTX_free (m_Ctx);
+	}
+	
+	void ChaCha20Context::operator ()(const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out)
+	{
+		ChaCha20 (m_Ctx, msg, msgLen, key, nonce, out);
+	}	
+	
 	void HKDF (const uint8_t * salt, const uint8_t * key, size_t keyLen, const std::string& info,
 		uint8_t * out, size_t outLen)
 	{
@@ -763,6 +821,18 @@ namespace crypto
 
 // Noise
 
+	void NoiseSymmetricState::Init (const uint8_t * ck, const uint8_t * hh, const uint8_t * pub)
+	{
+		// pub is Bob's public static key, hh = SHA256(h)
+		memcpy (m_CK, ck, 32);
+		SHA256_CTX ctx;
+		SHA256_Init (&ctx);
+		SHA256_Update (&ctx, hh, 32);
+		SHA256_Update (&ctx, pub, 32);
+		SHA256_Final (m_H, &ctx); // h = MixHash(pub) = SHA256(hh || pub)
+		m_N = 0;
+	}	
+	
 	void NoiseSymmetricState::MixHash (const uint8_t * buf, size_t len)
 	{
 		SHA256_CTX ctx;
@@ -786,74 +856,93 @@ namespace crypto
 	{
 		HKDF (m_CK, sharedSecret, 32, "", m_CK);
 		// new ck is m_CK[0:31], key is m_CK[32:63]
+		m_N = 0;
 	}
 
-	static void InitNoiseState (NoiseSymmetricState& state, const uint8_t * ck,
+	bool NoiseSymmetricState::Encrypt (const uint8_t * in, uint8_t * out, size_t len)
-		const uint8_t * hh, const uint8_t * pub)
 	{
-		// pub is Bob's public static key, hh = SHA256(h)
+		uint8_t nonce[12];
-		memcpy (state.m_CK, ck, 32);
+		if (m_N)
-		SHA256_CTX ctx;
+		{	
-		SHA256_Init (&ctx);
+			memset (nonce, 0, 4);
-		SHA256_Update (&ctx, hh, 32);
+			htole64buf (nonce + 4, m_N);
-		SHA256_Update (&ctx, pub, 32);
+		}	
-		SHA256_Final (state.m_H, &ctx); // h = MixHash(pub) = SHA256(hh || pub)
+		else
+			memset (nonce, 0, 12);
+		auto ret = AEADChaCha20Poly1305 (in, len, m_H, 32, m_CK + 32, nonce, out, len + 16, true);
+		if (ret) m_N++;
+		return ret;
+	}
+
+	bool NoiseSymmetricState::Decrypt (const uint8_t * in, uint8_t * out, size_t len)
+	{
+		uint8_t nonce[12];
+		if (m_N)
+		{	
+			memset (nonce, 0, 4);
+			htole64buf (nonce + 4, m_N);
+		}
+		else
+			memset (nonce, 0, 12);
+		auto ret = AEADChaCha20Poly1305 (in, len, m_H, 32, m_CK + 32, nonce, out, len, false);
+		if (ret) m_N++;
+		return ret;
 	}	
 	
 	void InitNoiseNState (NoiseSymmetricState& state, const uint8_t * pub)
 	{
-		static const char protocolName[] = "Noise_N_25519_ChaChaPoly_SHA256"; // 31 chars
+		static constexpr char protocolName[] = "Noise_N_25519_ChaChaPoly_SHA256"; // 31 chars
-		static const uint8_t hh[32] =
+		static constexpr uint8_t hh[32] =
 		{
 			0x69, 0x4d, 0x52, 0x44, 0x5a, 0x27, 0xd9, 0xad, 0xfa, 0xd2, 0x9c, 0x76, 0x32, 0x39, 0x5d, 0xc1,
 			0xe4, 0x35, 0x4c, 0x69, 0xb4, 0xf9, 0x2e, 0xac, 0x8a, 0x1e, 0xe4, 0x6a, 0x9e, 0xd2, 0x15, 0x54
 		}; // hh = SHA256(protocol_name || 0)
-		InitNoiseState (state, (const uint8_t *)protocolName, hh, pub); // ck = protocol_name || 0
+		state.Init ((const uint8_t *)protocolName, hh, pub); // ck = protocol_name || 0
 	}
 
 	void InitNoiseXKState (NoiseSymmetricState& state, const uint8_t * pub)
 	{
-		static const uint8_t protocolNameHash[32] =
+		static constexpr uint8_t protocolNameHash[32] =
 		{
 			0x72, 0xe8, 0x42, 0xc5, 0x45, 0xe1, 0x80, 0x80, 0xd3, 0x9c, 0x44, 0x93, 0xbb, 0x91, 0xd7, 0xed,
 			0xf2, 0x28, 0x98, 0x17, 0x71, 0x21, 0x8c, 0x1f, 0x62, 0x4e, 0x20, 0x6f, 0x28, 0xd3, 0x2f, 0x71
 		}; // SHA256 ("Noise_XKaesobfse+hs2+hs3_25519_ChaChaPoly_SHA256")
-		static const uint8_t hh[32] =
+		static constexpr uint8_t hh[32] =
 		{
 			0x49, 0xff, 0x48, 0x3f, 0xc4, 0x04, 0xb9, 0xb2, 0x6b, 0x11, 0x94, 0x36, 0x72, 0xff, 0x05, 0xb5,
 			0x61, 0x27, 0x03, 0x31, 0xba, 0x89, 0xb8, 0xfc, 0x33, 0x15, 0x93, 0x87, 0x57, 0xdd, 0x3d, 0x1e
 		}; // SHA256 (protocolNameHash)
-		InitNoiseState (state, protocolNameHash, hh, pub);
+		state.Init (protocolNameHash, hh, pub);
 	}
 
 	void InitNoiseXKState1 (NoiseSymmetricState& state, const uint8_t * pub)
 	{
-		static const uint8_t protocolNameHash[32] =
+		static constexpr uint8_t protocolNameHash[32] =
 		{
 			0xb1, 0x37, 0x22, 0x81, 0x74, 0x23, 0xa8, 0xfd, 0xf4, 0x2d, 0xf2, 0xe6, 0x0e, 0xd1, 0xed, 0xf4,
 			0x1b, 0x93, 0x07, 0x1d, 0xb1, 0xec, 0x24, 0xa3, 0x67, 0xf7, 0x84, 0xec, 0x27, 0x0d, 0x81, 0x32
 		}; // SHA256 ("Noise_XKchaobfse+hs1+hs2+hs3_25519_ChaChaPoly_SHA256")
-		static const uint8_t hh[32] =
+		static constexpr uint8_t hh[32] =
 		{
 			0xdc, 0x85, 0xe6, 0xaf, 0x7b, 0x02, 0x65, 0x0c, 0xf1, 0xf9, 0x0d, 0x71, 0xfb, 0xc6, 0xd4, 0x53,
 			0xa7, 0xcf, 0x6d, 0xbf, 0xbd, 0x52, 0x5e, 0xa5, 0xb5, 0x79, 0x1c, 0x47, 0xb3, 0x5e, 0xbc, 0x33
 		}; // SHA256 (protocolNameHash)
-		InitNoiseState (state, protocolNameHash, hh, pub);
+		state.Init (protocolNameHash, hh, pub);
 	}
 
 	void InitNoiseIKState (NoiseSymmetricState& state, const uint8_t * pub)
 	{
-		static const uint8_t protocolNameHash[32] =
+		static constexpr uint8_t protocolNameHash[32] =
 		{
 			0x4c, 0xaf, 0x11, 0xef, 0x2c, 0x8e, 0x36, 0x56, 0x4c, 0x53, 0xe8, 0x88, 0x85, 0x06, 0x4d, 0xba,
 			0xac, 0xbe, 0x00, 0x54, 0xad, 0x17, 0x8f, 0x80, 0x79, 0xa6, 0x46, 0x82, 0x7e, 0x6e, 0xe4, 0x0c
 		}; // SHA256("Noise_IKelg2+hs2_25519_ChaChaPoly_SHA256"), 40 bytes
-		static const uint8_t hh[32] =
+		static constexpr uint8_t hh[32] =
 		{
 			0x9c, 0xcf, 0x85, 0x2c, 0xc9, 0x3b, 0xb9, 0x50, 0x44, 0x41, 0xe9, 0x50, 0xe0, 0x1d, 0x52, 0x32,
 			0x2e, 0x0d, 0x47, 0xad, 0xd1, 0xe9, 0xa5, 0x55, 0xf7, 0x55, 0xb5, 0x69, 0xae, 0x18, 0x3b, 0x5c
 		}; // SHA256 (protocolNameHash)
-		InitNoiseState (state, protocolNameHash, hh, pub);
+		state.Init (protocolNameHash, hh, pub);
 	}
 		
 // init and terminate

libi2pd/Crypto.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -33,6 +33,9 @@
 #	if (!defined(LIBRESSL_VERSION_NUMBER) && (OPENSSL_VERSION_NUMBER != 0x030000000)) // 3.0.0, regression in SipHash, not implemented in LibreSSL
 #		define OPENSSL_SIPHASH 1
 #	endif
+#	if (OPENSSL_VERSION_NUMBER >= 0x030500000) // 3.5.0
+#		define OPENSSL_PQ 1
+#	endif
 #endif
 
 namespace i2p
@@ -42,7 +45,11 @@ namespace crypto
 	bool bn2buf (const BIGNUM * bn, uint8_t * buf, size_t len);
 
 	// DSA
+#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
+	EVP_PKEY * CreateDSA (BIGNUM * pubKey = nullptr, BIGNUM * privKey = nullptr);
+#else
 	DSA * CreateDSA ();
+#endif	
 
 	// RSA
 	const BIGNUM * GetRSAE ();
@@ -226,6 +233,19 @@ namespace crypto
 // ChaCha20
 	void ChaCha20 (const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out);
 
+	class ChaCha20Context
+	{
+		public:
+
+			ChaCha20Context ();
+			~ChaCha20Context ();
+			void operator ()(const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out);
+			
+		private:
+
+			EVP_CIPHER_CTX * m_Ctx;	
+	};
+	
 // HKDF
 
 	void HKDF (const uint8_t * salt, const uint8_t * key, size_t keyLen, const std::string& info, uint8_t * out, size_t outLen = 64); // salt - 32, out - 32 or 64, info <= 32
@@ -235,10 +255,16 @@ namespace crypto
 	struct NoiseSymmetricState
 	{
 		uint8_t m_H[32] /*h*/, m_CK[64] /*[ck, k]*/;
+		uint64_t m_N;
+
+		void Init (const uint8_t * ck, const uint8_t * hh, const uint8_t * pub);
 		
 		void MixHash (const uint8_t * buf, size_t len);
 		void MixHash (const std::vector<std::pair<uint8_t *, size_t> >& bufs);
 		void MixKey (const uint8_t * sharedSecret);
+
+		bool Encrypt (const uint8_t * in, uint8_t * out, size_t len); // out length = len + 16
+		bool Decrypt (const uint8_t * in, uint8_t * out, size_t len); // len without 16 bytes tag
 	};
 
 	void InitNoiseNState (NoiseSymmetricState& state, const uint8_t * pub); // Noise_N (tunnels, router)

libi2pd/CryptoKey.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2021, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -181,5 +181,21 @@ namespace crypto
 		k.GetPrivateKey (priv);
 		memcpy (pub, k.GetPublicKey (), 32);
 	}
+
+	LocalEncryptionKey::LocalEncryptionKey (i2p::data::CryptoKeyType t): keyType(t) 
+	{ 
+		pub.resize (GetCryptoPublicKeyLen (keyType)); 
+		priv.resize (GetCryptoPrivateKeyLen (keyType));
+	}
+	
+	void LocalEncryptionKey::GenerateKeys () 
+	{ 
+		i2p::data::PrivateKeys::GenerateCryptoKeyPair (keyType, priv.data (), pub.data ()); 
+	}
+	
+	void LocalEncryptionKey::CreateDecryptor () 
+	{ 
+		decryptor = i2p::data::PrivateKeys::CreateDecryptor (keyType, priv.data ()); 
+	}
 }
 }

libi2pd/CryptoKey.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2021, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,6 +11,7 @@
 
 #include <inttypes.h>
 #include "Crypto.h"
+#include "Identity.h"
 
 namespace i2p
 {
@@ -157,7 +158,50 @@ namespace crypto
 			X25519Keys m_StaticKeys;
 	};
 
-	void CreateECIESX25519AEADRatchetRandomKeys (uint8_t * priv, uint8_t * pub);
+	void CreateECIESX25519AEADRatchetRandomKeys (uint8_t * priv, uint8_t * pub); // including hybrid
+
+	constexpr size_t GetCryptoPrivateKeyLen (i2p::data::CryptoKeyType type)
+	{
+		switch (type)
+		{
+			case i2p::data::CRYPTO_KEY_TYPE_ELGAMAL: return 256;
+			case i2p::data::CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC: return 32;
+			case i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD: return 32;
+			// ML-KEM hybrid
+			case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD:
+			case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM768_X25519_AEAD:
+			case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM1024_X25519_AEAD:	
+				return 32;
+		};	
+		return 0;
+	}
+
+	constexpr size_t GetCryptoPublicKeyLen (i2p::data::CryptoKeyType type)
+	{
+		switch (type)
+		{
+			case i2p::data::CRYPTO_KEY_TYPE_ELGAMAL: return 256;
+			case i2p::data::CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC: return 32;
+			case i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD: return 32;
+			// ML-KEM hybrid
+			case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD:
+			case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM768_X25519_AEAD:
+			case i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM1024_X25519_AEAD:	
+				return 32;
+		};	
+		return 0;
+	}
+
+	struct LocalEncryptionKey
+	{
+		std::vector<uint8_t> pub, priv;
+		i2p::data::CryptoKeyType keyType;
+		std::shared_ptr<CryptoKeyDecryptor> decryptor;
+
+		LocalEncryptionKey (i2p::data::CryptoKeyType t);
+		void GenerateKeys ();
+		void CreateDecryptor (); 
+	};
 }
 }
 

libi2pd/Datagram.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -104,8 +104,7 @@ namespace datagram
 
 		if (verified)
 		{
-			auto h = identity.GetIdentHash();
+			auto session = ObtainSession (identity.GetIdentHash());
-			auto session = ObtainSession(h);
 			session->Ack();
 			auto r = FindReceiver(toPort);
 			if(r)
@@ -381,15 +380,19 @@ namespace datagram
 			if (!found)
 			{
 				m_RoutingSession = m_LocalDestination->GetRoutingSession(m_RemoteLeaseSet, true);
-				if (!m_RoutingSession->GetOwner () || !m_RoutingSession->IsReadyToSend ())
+				if (m_RoutingSession)
-					m_PendingRoutingSessions.push_back (m_RoutingSession);
+				{	
+					m_RoutingSession->SetAckRequestInterval (DATAGRAM_SESSION_ACK_REQUEST_INTERVAL);
+					if (!m_RoutingSession->GetOwner () || !m_RoutingSession->IsReadyToSend ())
+						m_PendingRoutingSessions.push_back (m_RoutingSession);
+				}	
 			}
 		}
 
 		auto path = m_RoutingSession->GetSharedRoutingPath();
-		if (path && m_RoutingSession->IsRatchets () && (m_RoutingSession->CleanupUnconfirmedTags () ||
+		if (path && m_RoutingSession->IsRatchets () && m_RoutingSession->CleanupUnconfirmedTags ())
-			m_LastUse > m_RoutingSession->GetLastActivityTimestamp ()*1000 + DATAGRAM_SESSION_PATH_TIMEOUT))
 		{
+			LogPrint (eLogDebug, "Datagram: path reset");
 			m_RoutingSession->SetSharedRoutingPath (nullptr);
 			path = nullptr;
 		}

libi2pd/Datagram.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -31,8 +31,6 @@ namespace datagram
 {
 	// milliseconds for max session idle time
 	const uint64_t DATAGRAM_SESSION_MAX_IDLE = 10 * 60 * 1000;
-	// milliseconds for how long we try sticking to a dead routing path before trying to switch
-	const uint64_t DATAGRAM_SESSION_PATH_TIMEOUT = 10 * 1000;
 	// milliseconds interval a routing path is used before switching
 	const uint64_t DATAGRAM_SESSION_PATH_SWITCH_INTERVAL = 20 * 60 * 1000;
 	// milliseconds before lease expire should we try switching leases
@@ -44,6 +42,7 @@ namespace datagram
 	// max 64 messages buffered in send queue for each datagram session
 	const size_t DATAGRAM_SEND_QUEUE_MAX_SIZE = 64;
 	const uint64_t DATAGRAM_MAX_FLUSH_INTERVAL = 5; // in milliseconds
+	const int DATAGRAM_SESSION_ACK_REQUEST_INTERVAL = 5500; // in milliseconds
 
 	class DatagramSession : public std::enable_shared_from_this<DatagramSession>
 	{

libi2pd/Destination.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -13,6 +13,7 @@
 #include <vector>
 #include <boost/algorithm/string.hpp>
 #include "Crypto.h"
+#include "ECIESX25519AEADRatchetSession.h"
 #include "Log.h"
 #include "FS.h"
 #include "Timestamp.h"
@@ -195,7 +196,7 @@ namespace client
 			m_IsPublic = itr->second != "true";
 		}
 
-		int inLen, outLen, inQuant, outQuant, numTags, minLatency, maxLatency;
+		int inLen = 0, outLen = 0, inQuant = 0, outQuant = 0, numTags = 0, minLatency = 0, maxLatency = 0;
 		std::map<std::string, int&> intOpts = {
 			{I2CP_PARAM_INBOUND_TUNNEL_LENGTH, inLen},
 			{I2CP_PARAM_OUTBOUND_TUNNEL_LENGTH, outLen},
@@ -377,10 +378,12 @@ namespace client
 	{
 		I2NPMessageType typeID = (I2NPMessageType)(buf[I2NP_HEADER_TYPEID_OFFSET]);
 		uint32_t msgID = bufbe32toh (buf + I2NP_HEADER_MSGID_OFFSET);
-		LeaseSetDestination::HandleCloveI2NPMessage (typeID, buf + I2NP_HEADER_SIZE, GetI2NPMessageLength(buf, len) - I2NP_HEADER_SIZE, msgID);
+		LeaseSetDestination::HandleCloveI2NPMessage (typeID, buf + I2NP_HEADER_SIZE, 
+			GetI2NPMessageLength(buf, len) - I2NP_HEADER_SIZE, msgID, nullptr);
 	}
 
-	bool LeaseSetDestination::HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, size_t len, uint32_t msgID)
+	bool LeaseSetDestination::HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload,
+		size_t len, uint32_t msgID, i2p::garlic::ECIESX25519AEADRatchetSession * from)
 	{
 		switch (typeID)
 		{
@@ -395,7 +398,7 @@ namespace client
 					m_Pool->ProcessTunnelTest (bufbe32toh (payload + TUNNEL_TEST_MSGID_OFFSET), bufbe64toh (payload + TUNNEL_TEST_TIMESTAMP_OFFSET));
 			break;
 			case eI2NPDatabaseStore:
-				HandleDatabaseStoreMessage (payload, len);
+				HandleDatabaseStoreMessage (payload, len, from);
 			break;
 			case eI2NPDatabaseSearchReply:
 				HandleDatabaseSearchReplyMessage (payload, len);
@@ -410,7 +413,8 @@ namespace client
 		return true;
 	}
 
-	void LeaseSetDestination::HandleDatabaseStoreMessage (const uint8_t * buf, size_t len)
+	void LeaseSetDestination::HandleDatabaseStoreMessage (const uint8_t * buf, size_t len,
+		i2p::garlic::ECIESX25519AEADRatchetSession * from)
 	{
 		if (len < DATABASE_STORE_HEADER_SIZE)
 		{
@@ -465,7 +469,8 @@ namespace client
 					if (buf[DATABASE_STORE_TYPE_OFFSET] == i2p::data::NETDB_STORE_TYPE_LEASESET)
 						leaseSet = std::make_shared<i2p::data::LeaseSet> (buf + offset, len - offset); // LeaseSet
 					else
-						leaseSet = std::make_shared<i2p::data::LeaseSet2> (buf[DATABASE_STORE_TYPE_OFFSET], buf + offset, len - offset, true, GetPreferredCryptoType () ); // LeaseSet2
+						leaseSet = std::make_shared<i2p::data::LeaseSet2> (buf[DATABASE_STORE_TYPE_OFFSET], 
+							buf + offset, len - offset, true, from ? from->GetRemoteStaticKeyType () : GetPreferredCryptoType () ); // LeaseSet2
 					if (leaseSet->IsValid () && leaseSet->GetIdentHash () == key && !leaseSet->IsExpired ())
 					{
 						if (leaseSet->GetIdentHash () != GetIdentHash ())
@@ -494,7 +499,8 @@ namespace client
 					if (request->requestedBlindedKey)
 					{
 						auto ls2 = std::make_shared<i2p::data::LeaseSet2> (buf + offset, len - offset,
-							request->requestedBlindedKey, m_LeaseSetPrivKey ? ((const uint8_t *)*m_LeaseSetPrivKey) : nullptr , GetPreferredCryptoType ());
+							request->requestedBlindedKey, m_LeaseSetPrivKey ? ((const uint8_t *)*m_LeaseSetPrivKey) : nullptr, 
+						    from ? from->GetRemoteStaticKeyType () : GetPreferredCryptoType ());
 						if (ls2->IsValid () && !ls2->IsExpired ())
 						{
 							leaseSet = ls2;
@@ -597,7 +603,8 @@ namespace client
 			m_ExcludedFloodfills.clear ();
 			m_PublishReplyToken = 0;
 			// schedule verification
-			m_PublishVerificationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_VERIFICATION_TIMEOUT));
+			m_PublishVerificationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_VERIFICATION_TIMEOUT +
+				(m_Pool ? m_Pool->GetRng ()() % PUBLISH_VERIFICATION_TIMEOUT_VARIANCE : 0)));
 			m_PublishVerificationTimer.async_wait (std::bind (&LeaseSetDestination::HandlePublishVerificationTimer,
 			shared_from_this (), std::placeholders::_1));
 		}
@@ -676,8 +683,8 @@ namespace client
 				m_ExcludedFloodfills.clear ();
 				m_PublishReplyToken = 1; // dummy non-zero value
 				// try again after a while
-				LogPrint (eLogInfo, "Destination: Can't publish LeasetSet because destination is not ready. Try publishing again after ", PUBLISH_CONFIRMATION_TIMEOUT, " seconds");
+				LogPrint (eLogInfo, "Destination: Can't publish LeasetSet because destination is not ready. Try publishing again after ", PUBLISH_CONFIRMATION_TIMEOUT, " milliseconds");
-				m_PublishConfirmationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_CONFIRMATION_TIMEOUT));
+				m_PublishConfirmationTimer.expires_from_now (boost::posix_time::milliseconds(PUBLISH_CONFIRMATION_TIMEOUT));
 				m_PublishConfirmationTimer.async_wait (std::bind (&LeaseSetDestination::HandlePublishConfirmationTimer,
 					shared_from_this (), std::placeholders::_1));
 				return;
@@ -696,7 +703,7 @@ namespace client
 						s->HandlePublishConfirmationTimer (boost::system::error_code());
 					});
 			};
-		m_PublishConfirmationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_CONFIRMATION_TIMEOUT));
+		m_PublishConfirmationTimer.expires_from_now (boost::posix_time::milliseconds(PUBLISH_CONFIRMATION_TIMEOUT));
 		m_PublishConfirmationTimer.async_wait (std::bind (&LeaseSetDestination::HandlePublishConfirmationTimer,
 			shared_from_this (), std::placeholders::_1));
 		outbound->SendTunnelDataMsgTo (floodfill->GetIdentHash (), 0, msg);
@@ -712,15 +719,15 @@ namespace client
 				m_PublishReplyToken = 0;
 				if (GetIdentity ()->GetCryptoKeyType () == i2p::data::CRYPTO_KEY_TYPE_ELGAMAL)
 				{
-					LogPrint (eLogWarning, "Destination: Publish confirmation was not received in ", PUBLISH_CONFIRMATION_TIMEOUT, " seconds or failed. will try again");
+					LogPrint (eLogWarning, "Destination: Publish confirmation was not received in ", PUBLISH_CONFIRMATION_TIMEOUT, " milliseconds or failed. will try again");
 					Publish ();
 				}
 				else
 				{
-					LogPrint (eLogWarning, "Destination: Publish confirmation was not received in ", PUBLISH_CONFIRMATION_TIMEOUT, " seconds from Java floodfill for crypto type ", (int)GetIdentity ()->GetCryptoKeyType ());
+					LogPrint (eLogWarning, "Destination: Publish confirmation was not received in ", PUBLISH_CONFIRMATION_TIMEOUT, " milliseconds from Java floodfill for crypto type ", (int)GetIdentity ()->GetCryptoKeyType ());
 					// Java floodfill never sends confirmation back for unknown crypto type
 					// assume it successive and try to verify
-					m_PublishVerificationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_VERIFICATION_TIMEOUT));
+					m_PublishVerificationTimer.expires_from_now (boost::posix_time::seconds(PUBLISH_VERIFICATION_TIMEOUT + PUBLISH_VERIFICATION_TIMEOUT_VARIANCE)); // always max
 					m_PublishVerificationTimer.async_wait (std::bind (&LeaseSetDestination::HandlePublishVerificationTimer,
 			shared_from_this (), std::placeholders::_1));
 
@@ -993,17 +1000,10 @@ namespace client
 		}
 	}
 
-	i2p::data::CryptoKeyType LeaseSetDestination::GetPreferredCryptoType () const
-	{
-		if (SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD))
-			return i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD;
-		return i2p::data::CRYPTO_KEY_TYPE_ELGAMAL;
-	}
-
 	ClientDestination::ClientDestination (boost::asio::io_context& service, const i2p::data::PrivateKeys& keys,
 		bool isPublic, const std::map<std::string, std::string> * params):
 		LeaseSetDestination (service, isPublic, params),
-		m_Keys (keys), m_StreamingAckDelay (DEFAULT_INITIAL_ACK_DELAY),
+		m_Keys (keys), m_PreferredCryptoType (0), m_StreamingAckDelay (DEFAULT_INITIAL_ACK_DELAY),
 		m_StreamingOutboundSpeed (DEFAULT_MAX_OUTBOUND_SPEED),
 		m_StreamingInboundSpeed (DEFAULT_MAX_INBOUND_SPEED),
 		m_StreamingMaxConcurrentStreams (DEFAULT_MAX_CONCURRENT_STREAMS),
@@ -1028,7 +1028,15 @@ namespace client
 				{
 					try
 					{
-						encryptionKeyTypes.insert (std::stoi(it1));
+						i2p::data::CryptoKeyType cryptoType = std::stoi(it1);
+#if !OPENSSL_PQ
+						if (cryptoType <= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD) // skip PQ keys if not supported
+#endif					
+						{
+							if (!m_PreferredCryptoType && cryptoType)
+								m_PreferredCryptoType = cryptoType; // first non-zero in the list
+							encryptionKeyTypes.insert (cryptoType);
+						}	
 					}
 					catch (std::exception& ex)
 					{
@@ -1045,20 +1053,15 @@ namespace client
 
 		for (auto& it: encryptionKeyTypes)
 		{
-			auto encryptionKey = new EncryptionKey (it);
+			auto encryptionKey = std::make_shared<i2p::crypto::LocalEncryptionKey> (it);
 			if (IsPublic ())
 				PersistTemporaryKeys (encryptionKey);
 			else
 				encryptionKey->GenerateKeys ();
 			encryptionKey->CreateDecryptor ();
-			if (it == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)
+			if (it > i2p::data::CRYPTO_KEY_TYPE_ELGAMAL && GetLeaseSetType () == i2p::data::NETDB_STORE_TYPE_LEASESET)
-			{
+				SetLeaseSetType (i2p::data::NETDB_STORE_TYPE_STANDARD_LEASESET2); // Only DSA can use LeaseSet1
-				m_ECIESx25519EncryptionKey.reset (encryptionKey);
+			m_EncryptionKeys.emplace (it, encryptionKey);
-				if (GetLeaseSetType () == i2p::data::NETDB_STORE_TYPE_LEASESET)
-					SetLeaseSetType (i2p::data::NETDB_STORE_TYPE_STANDARD_LEASESET2); // Rathets must use LeaseSet2
-			}
-			else
-				m_StandardEncryptionKey.reset (encryptionKey);
 		}
 
 		if (IsPublic ())
@@ -1408,31 +1411,56 @@ namespace client
 		return ret;
 	}
 
-	void ClientDestination::PersistTemporaryKeys (EncryptionKey * keys)
+	void ClientDestination::PersistTemporaryKeys (std::shared_ptr<i2p::crypto::LocalEncryptionKey> keys)
 	{
 		if (!keys) return;
 		std::string ident = GetIdentHash().ToBase32();
 		std::string path  = i2p::fs::DataDirPath("destinations", ident + "." + std::to_string (keys->keyType) + ".dat");
 		std::ifstream f(path, std::ifstream::binary);
+		if (f) 
+		{
+			size_t len = 0;
+			if (keys->keyType == i2p::data::CRYPTO_KEY_TYPE_ELGAMAL)
+				len = 512;
+			else if (keys->keyType == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)
+			{	
+				f.seekg (0, std::ios::end);
+				len = f.tellg();
+				f.seekg (0, std::ios::beg);
+			}
 				
-		if (f) {
+			if (len == 512)
-			f.read ((char *)keys->pub, 256);
+			{    
-			f.read ((char *)keys->priv, 256);
+				char pub[256], priv[256];
-			return;
+				f.read (pub, 256);
+				memcpy (keys->pub.data(), pub, keys->pub.size());
+				f.read (priv, 256);
+				memcpy (keys->priv.data (), priv, keys->priv.size ());
+			}
+			else
+			{
+				f.read ((char *)keys->pub.data(), keys->pub.size());
+				f.read ((char *)keys->priv.data(), keys->priv.size());
+			}	
+			if (f) 
+				return;
+			else
+				LogPrint(eLogWarning, "Destination: Can't read keys from ", path);
 		}
 
-		LogPrint (eLogInfo, "Destination: Creating new temporary keys of type for address ", ident, ".b32.i2p");
+		LogPrint (eLogInfo, "Destination: Creating new temporary keys of type ", keys->keyType, " for address ", ident, ".b32.i2p");
-		memset (keys->priv, 0, 256);
+		memset (keys->priv.data (), 0, keys->priv.size ());
-		memset (keys->pub, 0, 256);
+		memset (keys->pub.data (), 0, keys->pub.size ());
 		keys->GenerateKeys ();
-		// TODO:: persist crypto key type
+		
 		std::ofstream f1 (path, std::ofstream::binary | std::ofstream::out);
-		if (f1) {
+		if (f1) 
-			f1.write ((char *)keys->pub, 256);
+		{
-			f1.write ((char *)keys->priv, 256);
+			f1.write ((char *)keys->pub.data (), keys->pub.size ());
-			return;
+			f1.write ((char *)keys->priv.data (), keys->priv.size ());
 		}
-		LogPrint(eLogCritical, "Destinations: Can't save keys to ", path);
+		if (!f1)
+			LogPrint(eLogError, "Destination: Can't save keys to ", path);
 	}
 
 	void ClientDestination::CreateNewLeaseSet (const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels)
@@ -1440,9 +1468,10 @@ namespace client
 		std::shared_ptr<i2p::data::LocalLeaseSet> leaseSet;
 		if (GetLeaseSetType () == i2p::data::NETDB_STORE_TYPE_LEASESET)
 		{
-			if (m_StandardEncryptionKey)
+			auto it = m_EncryptionKeys.find (i2p::data::CRYPTO_KEY_TYPE_ELGAMAL);
+			if (it != m_EncryptionKeys.end ())
 			{
-				leaseSet = std::make_shared<i2p::data::LocalLeaseSet> (GetIdentity (), m_StandardEncryptionKey->pub, tunnels);
+				leaseSet = std::make_shared<i2p::data::LocalLeaseSet> (GetIdentity (), it->second->pub.data (), tunnels);
 				// sign
 				Sign (leaseSet->GetBuffer (), leaseSet->GetBufferLen () - leaseSet->GetSignatureLen (), leaseSet->GetSignature ());
 			}
@@ -1452,11 +1481,26 @@ namespace client
 		else
 		{
 			// standard LS2 (type 3) first
-			i2p::data::LocalLeaseSet2::KeySections keySections;
+			if (m_EncryptionKeys.empty ())
-			if (m_ECIESx25519EncryptionKey)
+			{
-				keySections.push_back ({m_ECIESx25519EncryptionKey->keyType, 32, m_ECIESx25519EncryptionKey->pub} );
+				LogPrint (eLogError, "Destinations: No encryption keys");
-			if (m_StandardEncryptionKey)
+				return;
-				keySections.push_back ({m_StandardEncryptionKey->keyType, (uint16_t)m_StandardEncryptionKey->decryptor->GetPublicKeyLen (), m_StandardEncryptionKey->pub} );
+			}	
+			
+			i2p::data::LocalLeaseSet2::EncryptionKeys keySections;
+			std::shared_ptr<const i2p::crypto::LocalEncryptionKey> preferredSection;
+			if (m_EncryptionKeys.size () == 1)
+				preferredSection = m_EncryptionKeys.begin ()->second; // only key
+			else
+			{	
+				for (const auto& it: m_EncryptionKeys)
+					if (it.first == m_PreferredCryptoType)
+						preferredSection = it.second;
+					else
+						keySections.push_back (it.second);
+			}	
+			if (preferredSection) 
+				keySections.push_front (preferredSection); // make preferred first
 			
 			auto publishedTimestamp = i2p::util::GetSecondsSinceEpoch ();
 			if (publishedTimestamp <= m_LastPublishedTimestamp)
@@ -1482,11 +1526,22 @@ namespace client
 
 	bool ClientDestination::Decrypt (const uint8_t * encrypted, uint8_t * data, i2p::data::CryptoKeyType preferredCrypto) const
 	{
-		if (preferredCrypto == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)
+		std::shared_ptr<i2p::crypto::LocalEncryptionKey> encryptionKey;
-			if (m_ECIESx25519EncryptionKey && m_ECIESx25519EncryptionKey->decryptor)
+		if (!m_EncryptionKeys.empty ())
-				return m_ECIESx25519EncryptionKey->decryptor->Decrypt (encrypted, data);
+		{
-		if (m_StandardEncryptionKey && m_StandardEncryptionKey->decryptor)
+			if (m_EncryptionKeys.rbegin ()->first == preferredCrypto)
-			return m_StandardEncryptionKey->decryptor->Decrypt (encrypted, data);
+				encryptionKey = m_EncryptionKeys.rbegin ()->second;
+			else
+			{
+				auto it = m_EncryptionKeys.find (preferredCrypto);
+				if (it != m_EncryptionKeys.end ())
+					encryptionKey = it->second;
+			}	
+			if (!encryptionKey)
+				encryptionKey = m_EncryptionKeys.rbegin ()->second;
+		}	
+		if (encryptionKey)
+			return encryptionKey->decryptor->Decrypt (encrypted, data);
 		else
 			LogPrint (eLogError, "Destinations: Decryptor is not set");
 		return false;
@@ -1494,14 +1549,26 @@ namespace client
 
 	bool ClientDestination::SupportsEncryptionType (i2p::data::CryptoKeyType keyType) const
 	{
-		return keyType == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ? (bool)m_ECIESx25519EncryptionKey : (bool)m_StandardEncryptionKey;
+#if __cplusplus >= 202002L // C++20
+		return m_EncryptionKeys.contains (keyType);
+#else		
+		return m_EncryptionKeys.count (keyType) > 0;
+#endif		
+	}
+
+	i2p::data::CryptoKeyType ClientDestination::GetRatchetsHighestCryptoType () const
+	{
+		if (m_EncryptionKeys.empty ()) return 0;
+		auto cryptoType = m_EncryptionKeys.rbegin ()->first; 
+		return cryptoType >= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ? cryptoType : 0;
 	}
 		
 	const uint8_t * ClientDestination::GetEncryptionPublicKey (i2p::data::CryptoKeyType keyType) const
 	{
-		if (keyType == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)
+		auto it = m_EncryptionKeys.find (keyType);
-			return m_ECIESx25519EncryptionKey ? m_ECIESx25519EncryptionKey->pub : nullptr;
+		if (it != m_EncryptionKeys.end ())
-		return m_StandardEncryptionKey ? m_StandardEncryptionKey->pub : nullptr;
+			return it->second->pub.data ();
+		return nullptr;
 	}
 
 	void ClientDestination::ReadAuthKey (const std::string& group, const std::map<std::string, std::string> * params)

libi2pd/Destination.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -22,6 +22,7 @@
 #include "Identity.h"
 #include "TunnelPool.h"
 #include "Crypto.h"
+#include "CryptoKey.h"
 #include "LeaseSet.h"
 #include "Garlic.h"
 #include "NetDb.hpp"
@@ -36,8 +37,9 @@ namespace client
 	const uint8_t PROTOCOL_TYPE_STREAMING = 6;
 	const uint8_t PROTOCOL_TYPE_DATAGRAM = 17;
 	const uint8_t PROTOCOL_TYPE_RAW = 18;
-	const int PUBLISH_CONFIRMATION_TIMEOUT = 5; // in seconds
+	const int PUBLISH_CONFIRMATION_TIMEOUT = 1800; // in milliseconds
-	const int PUBLISH_VERIFICATION_TIMEOUT = 10; // in seconds after successful publish
+	const int PUBLISH_VERIFICATION_TIMEOUT = 5; // in seconds after successful publish
+	const int PUBLISH_VERIFICATION_TIMEOUT_VARIANCE = 3; // in seconds
 	const int PUBLISH_MIN_INTERVAL = 20; // in seconds
 	const int PUBLISH_REGULAR_VERIFICATION_INTERNAL = 100; // in seconds periodically
 	const int LEASESET_REQUEST_TIMEOUT = 1600; // in milliseconds
@@ -162,13 +164,15 @@ namespace client
 
 			// implements GarlicDestination
 			void HandleI2NPMessage (const uint8_t * buf, size_t len) override;
-			bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, size_t len, uint32_t msgID) override;
+			bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, 
+				size_t len, uint32_t msgID, i2p::garlic::ECIESX25519AEADRatchetSession * from) override;
 
 			void SetLeaseSet (std::shared_ptr<const i2p::data::LocalLeaseSet> newLeaseSet);
 			int GetLeaseSetType () const { return m_LeaseSetType; };
 			void SetLeaseSetType (int leaseSetType) { m_LeaseSetType = leaseSetType; };
 			int GetAuthType () const { return m_AuthType; };
 			virtual void CleanupDestination () {}; // additional clean up in derived classes
+			virtual i2p::data::CryptoKeyType GetPreferredCryptoType () const = 0;
 			// I2CP
 			virtual void HandleDataMessage (const uint8_t * buf, size_t len) = 0;
 			virtual void CreateNewLeaseSet (const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels) = 0;
@@ -181,7 +185,7 @@ namespace client
 			void HandlePublishConfirmationTimer (const boost::system::error_code& ecode);
 			void HandlePublishVerificationTimer (const boost::system::error_code& ecode);
 			void HandlePublishDelayTimer (const boost::system::error_code& ecode);
-			void HandleDatabaseStoreMessage (const uint8_t * buf, size_t len);
+			void HandleDatabaseStoreMessage (const uint8_t * buf, size_t len, i2p::garlic::ECIESX25519AEADRatchetSession * from);
 			void HandleDatabaseSearchReplyMessage (const uint8_t * buf, size_t len);
 			void HandleDeliveryStatusMessage (uint32_t msgID);
 
@@ -191,7 +195,6 @@ namespace client
 			void HandleRequestTimoutTimer (const boost::system::error_code& ecode, const i2p::data::IdentHash& dest);
 			void HandleCleanupTimer (const boost::system::error_code& ecode);
 			void CleanupRemoteLeaseSets ();
-			i2p::data::CryptoKeyType GetPreferredCryptoType () const;
 
 		private:
 
@@ -228,25 +231,14 @@ namespace client
 
 	class ClientDestination: public LeaseSetDestination
 	{
-		struct EncryptionKey
-		{
-			uint8_t pub[256], priv[256];
-			i2p::data::CryptoKeyType keyType;
-			std::shared_ptr<i2p::crypto::CryptoKeyDecryptor> decryptor;
-
-			EncryptionKey (i2p::data::CryptoKeyType t):keyType(t) { memset (pub, 0, 256); memset (priv, 0, 256);	};
-			void GenerateKeys () { i2p::data::PrivateKeys::GenerateCryptoKeyPair (keyType, priv, pub); };
-			void CreateDecryptor () { decryptor = i2p::data::PrivateKeys::CreateDecryptor (keyType, priv); };
-		};
-
 		public:
 
 			ClientDestination (boost::asio::io_context& service, const i2p::data::PrivateKeys& keys,
 				bool isPublic, const std::map<std::string, std::string> * params = nullptr);
 			~ClientDestination ();
 
-			void Start ();
+			void Start () override;
-			void Stop ();
+			void Stop () override;
 
 			const i2p::data::PrivateKeys& GetPrivateKeys () const { return m_Keys; };
 			void Sign (const uint8_t * buf, int len, uint8_t * signature) const { m_Keys.Sign (buf, len, signature); };
@@ -283,24 +275,28 @@ namespace client
 			i2p::datagram::DatagramDestination * CreateDatagramDestination (bool gzip = true);
 
 			// implements LocalDestination
-			bool Decrypt (const uint8_t * encrypted, uint8_t * data, i2p::data::CryptoKeyType preferredCrypto) const;
+			bool Decrypt (const uint8_t * encrypted, uint8_t * data, i2p::data::CryptoKeyType preferredCrypto) const override;
-			std::shared_ptr<const i2p::data::IdentityEx> GetIdentity () const { return m_Keys.GetPublic (); };
+			std::shared_ptr<const i2p::data::IdentityEx> GetIdentity () const override { return m_Keys.GetPublic (); };
-			bool SupportsEncryptionType (i2p::data::CryptoKeyType keyType) const;
+			bool SupportsEncryptionType (i2p::data::CryptoKeyType keyType) const override;
-			const uint8_t * GetEncryptionPublicKey (i2p::data::CryptoKeyType keyType) const;
+			const uint8_t * GetEncryptionPublicKey (i2p::data::CryptoKeyType keyType) const override;
 
 		protected:
 
-			void CleanupDestination ();
+			// GarlicDestionation
+			i2p::data::CryptoKeyType GetRatchetsHighestCryptoType () const override;
+			// LeaseSetDestination
+			void CleanupDestination () override;
+			i2p::data::CryptoKeyType GetPreferredCryptoType () const override { return m_PreferredCryptoType; }
 			// I2CP
-			void HandleDataMessage (const uint8_t * buf, size_t len);
+			void HandleDataMessage (const uint8_t * buf, size_t len) override;
-			void CreateNewLeaseSet (const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels);
+			void CreateNewLeaseSet (const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels) override;
 						
 		private:
 
 			std::shared_ptr<ClientDestination> GetSharedFromThis () {
 				return std::static_pointer_cast<ClientDestination>(shared_from_this ());
 			}
-			void PersistTemporaryKeys (EncryptionKey * keys);
+			void PersistTemporaryKeys (std::shared_ptr<i2p::crypto::LocalEncryptionKey> keys);
 			void ReadAuthKey (const std::string& group, const std::map<std::string, std::string> * params);
 
 			template<typename Dest>
@@ -309,8 +305,8 @@ namespace client
 		private:
 
 			i2p::data::PrivateKeys m_Keys;
-			std::unique_ptr<EncryptionKey> m_StandardEncryptionKey;
+			std::map<i2p::data::CryptoKeyType, std::shared_ptr<i2p::crypto::LocalEncryptionKey> > m_EncryptionKeys; // last is most preferable
-			std::unique_ptr<EncryptionKey> m_ECIESx25519EncryptionKey;
+			i2p::data::CryptoKeyType m_PreferredCryptoType;
 			
 			int m_StreamingAckDelay,m_StreamingOutboundSpeed, m_StreamingInboundSpeed, m_StreamingMaxConcurrentStreams;
 			bool m_IsStreamingAnswerPings;

libi2pd/ECIESX25519AEADRatchetSession.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,6 +11,7 @@
 #include "Log.h"
 #include "util.h"
 #include "Crypto.h"
+#include "PostQuantum.h"
 #include "Elligator.h"
 #include "Tag.h"
 #include "I2PEndian.h"
@@ -94,6 +95,17 @@ namespace garlic
 		m_ItermediateSymmKeys.erase (index);
 	}
 
+	ReceiveRatchetTagSet::ReceiveRatchetTagSet (std::shared_ptr<ECIESX25519AEADRatchetSession> session, bool isNS):
+		m_Session (session), m_IsNS (isNS) 
+	{
+	}
+		
+	ReceiveRatchetTagSet::~ReceiveRatchetTagSet ()
+	{
+		if (m_IsNS && m_Session)
+			m_Session->CleanupReceiveNSRKeys ();
+	}	
+	
 	void ReceiveRatchetTagSet::Expire ()
 	{
 		if (!m_ExpirationTimestamp)
@@ -162,12 +174,12 @@ namespace garlic
 			return false;
 		}
 		if (m_Destination)
-			m_Destination->HandleECIESx25519GarlicClove (buf + offset, size);
+			m_Destination->HandleECIESx25519GarlicClove (buf + offset, size, nullptr);
 		return true;
 	}
 
 	ECIESX25519AEADRatchetSession::ECIESX25519AEADRatchetSession (GarlicDestination * owner, bool attachLeaseSetNS):
-		GarlicRoutingSession (owner, true)
+		GarlicRoutingSession (owner, true), m_RemoteStaticKeyType (0)
 	{
 		if (!attachLeaseSetNS) SetLeaseSetUpdateStatus (eLeaseSetUpToDate);
 		RAND_bytes (m_PaddingSizes, 32); m_NextPaddingSize = 0;
@@ -252,12 +264,19 @@ namespace garlic
 		return false;
 	}	
 
+	void ECIESX25519AEADRatchetSession::CleanupReceiveNSRKeys ()
+	{
+		m_EphemeralKeys = nullptr;
+#if OPENSSL_PQ
+		m_PQKeys = nullptr;
+#endif	
+	}	
+		
 	bool ECIESX25519AEADRatchetSession::HandleNewIncomingSession (const uint8_t * buf, size_t len)
 	{
 		if (!GetOwner ()) return false;
 		// we are Bob
 		// KDF1
-		i2p::crypto::InitNoiseIKState (GetNoiseState (), GetOwner ()->GetEncryptionPublicKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)); // bpk
 		
 		if (!i2p::crypto::GetElligator ()->Decode (buf, m_Aepk))
 		{
@@ -265,20 +284,61 @@ namespace garlic
 			return false;
 		}
 		buf += 32; len -= 32;
-		MixHash (m_Aepk, 32); // h = SHA256(h || aepk)
 
 		uint8_t sharedSecret[32];
-		if (!GetOwner ()->Decrypt (m_Aepk, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) // x25519(bsk, aepk)
+		bool decrypted = false;
+		auto cryptoType = GetOwner ()->GetRatchetsHighestCryptoType ();
+#if OPENSSL_PQ
+		if (cryptoType > i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD) // we support post quantum
 		{
-			LogPrint (eLogWarning, "Garlic: Incorrect Alice ephemeral key");
+			i2p::crypto::InitNoiseIKStateMLKEM (GetNoiseState (), cryptoType, GetOwner ()->GetEncryptionPublicKey (cryptoType)); // bpk
-			return false;
+			MixHash (m_Aepk, 32); // h = SHA256(h || aepk)
+
+			if (GetOwner ()->Decrypt (m_Aepk, sharedSecret, cryptoType)) // x25519(bsk, aepk)
+			{
+				MixKey (sharedSecret);
+
+				auto keyLen = i2p::crypto::GetMLKEMPublicKeyLen (cryptoType);
+				std::vector<uint8_t> encapsKey(keyLen);
+				if (Decrypt (buf, encapsKey.data (), keyLen))
+				{
+					decrypted = true; // encaps section has right hash 
+					MixHash (buf, keyLen + 16);
+					buf += keyLen + 16;
+					len -= keyLen + 16;
+					
+					m_PQKeys = i2p::crypto::CreateMLKEMKeys (cryptoType);
+					m_PQKeys->SetPublicKey (encapsKey.data ());
+				}
+			}	
+		}	
+#endif
+		if (!decrypted)
+		{	
+			if (cryptoType == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ||
+			    GetOwner ()->SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD))
+			{
+				cryptoType = i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD;
+				i2p::crypto::InitNoiseIKState (GetNoiseState (), GetOwner ()->GetEncryptionPublicKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)); // bpk
+				MixHash (m_Aepk, 32); // h = SHA256(h || aepk)
+
+				if (!GetOwner ()->Decrypt (m_Aepk, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) // x25519(bsk, aepk)
+				{
+					LogPrint (eLogWarning, "Garlic: Incorrect Alice ephemeral key");
+					return false;
+				}
+				MixKey (sharedSecret);	
+			}	
+			else
+			{
+				LogPrint (eLogWarning, "Garlic: No supported encryption type");
+				return false;
+			}	
 		}	
-		MixKey (sharedSecret);
 
 		// decrypt flags/static
-		uint8_t nonce[12], fs[32];
+		uint8_t fs[32];
-		CreateNonce (0, nonce);
+		if (!Decrypt (buf, fs, 32))
-		if (!i2p::crypto::AEADChaCha20Poly1305 (buf, 32, m_H, 32, m_CK + 32, nonce, fs, 32, false)) // decrypt
 		{
 			LogPrint (eLogWarning, "Garlic: Flags/static section AEAD verification failed ");
 			return false;
@@ -291,20 +351,18 @@ namespace garlic
 		if (isStatic)
 		{
 			// static key, fs is apk	
-			memcpy (m_RemoteStaticKey, fs, 32);
+			SetRemoteStaticKey (cryptoType, fs); 
-			if (!GetOwner ()->Decrypt (fs, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)) // x25519(bsk, apk)
+			if (!GetOwner ()->Decrypt (fs, sharedSecret, m_RemoteStaticKeyType)) // x25519(bsk, apk)
 			{
 				LogPrint (eLogWarning, "Garlic: Incorrect Alice static key");
 				return false;
 			}
 			MixKey (sharedSecret);
 		}
-		else // all zeros flags
-			CreateNonce (1, nonce);
 
 		// decrypt payload
 		std::vector<uint8_t> payload (len - 16); // we must save original ciphertext
-		if (!i2p::crypto::AEADChaCha20Poly1305 (buf, len - 16, m_H, 32, m_CK + 32, nonce, payload.data (), len - 16, false)) // decrypt
+		if (!Decrypt (buf, payload.data (), len - 16))
 		{
 			LogPrint (eLogWarning, "Garlic: Payload section AEAD verification failed");
 			return false;
@@ -340,7 +398,7 @@ namespace garlic
 			{
 				case eECIESx25519BlkGalicClove:
 					if (GetOwner ())
-						GetOwner ()->HandleECIESx25519GarlicClove (buf + offset, size);
+						GetOwner ()->HandleECIESx25519GarlicClove (buf + offset, size, this);
 				break;
 				case eECIESx25519BlkNextKey:
 					LogPrint (eLogDebug, "Garlic: Next key");
@@ -492,7 +550,16 @@ namespace garlic
 		offset += 32;
 
 		// KDF1
-		i2p::crypto::InitNoiseIKState (GetNoiseState (), m_RemoteStaticKey); // bpk
+#if OPENSSL_PQ		
+		if (m_RemoteStaticKeyType >= i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD)
+		{
+			i2p::crypto::InitNoiseIKStateMLKEM (GetNoiseState (), m_RemoteStaticKeyType, m_RemoteStaticKey); // bpk
+			m_PQKeys = i2p::crypto::CreateMLKEMKeys (m_RemoteStaticKeyType);
+			m_PQKeys->GenerateKeys ();
+		}	
+		else	
+#endif			
+			i2p::crypto::InitNoiseIKState (GetNoiseState (), m_RemoteStaticKey); // bpk
 		MixHash (m_EphemeralKeys->GetPublicKey (), 32); // h = SHA256(h || aepk)
 		uint8_t sharedSecret[32];
 		if (!m_EphemeralKeys->Agree (m_RemoteStaticKey, sharedSecret)) // x25519(aesk, bpk)
@@ -501,18 +568,32 @@ namespace garlic
 			return false;
 		}
 		MixKey (sharedSecret);
+#if OPENSSL_PQ
+		if (m_RemoteStaticKeyType >= i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD)
+		{
+			auto keyLen = i2p::crypto::GetMLKEMPublicKeyLen (m_RemoteStaticKeyType);
+			std::vector<uint8_t> encapsKey(keyLen);
+			m_PQKeys->GetPublicKey (encapsKey.data ());
+			// encrypt encapsKey 
+			if (!Encrypt (encapsKey.data (), out + offset, keyLen))
+			{
+				LogPrint (eLogWarning, "Garlic: ML-KEM encap_key section AEAD encryption failed ");
+				return false;
+			}
+			MixHash (out + offset, keyLen + 16); // h = SHA256(h || ciphertext)
+			offset += keyLen + 16;
+		}	
+#endif		
 		// encrypt flags/static key section
-		uint8_t nonce[12];
-		CreateNonce (0, nonce);
 		const uint8_t * fs;
 		if (isStatic)
-			fs = GetOwner ()->GetEncryptionPublicKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD);
+			fs = GetOwner ()->GetEncryptionPublicKey (m_RemoteStaticKeyType);
 		else
 		{
 			memset (out + offset, 0, 32); // all zeros flags section
 			fs = out + offset;
 		}
-		if (!i2p::crypto::AEADChaCha20Poly1305 (fs, 32, m_H, 32, m_CK + 32, nonce, out + offset, 48, true)) // encrypt
+		if (!Encrypt (fs, out + offset, 32)) 
 		{
 			LogPrint (eLogWarning, "Garlic: Flags/static section AEAD encryption failed ");
 			return false;
@@ -523,13 +604,11 @@ namespace garlic
 		// KDF2
 		if (isStatic)
 		{
-			GetOwner ()->Decrypt (m_RemoteStaticKey, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD); // x25519 (ask, bpk)
+			GetOwner ()->Decrypt (m_RemoteStaticKey, sharedSecret, m_RemoteStaticKeyType); // x25519 (ask, bpk)
 			MixKey (sharedSecret);	
 		}
-		else
-			CreateNonce (1, nonce);
 		// encrypt payload
-		if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_CK + 32, nonce, out + offset, len + 16, true)) // encrypt
+		if (!Encrypt (payload, out + offset, len))
 		{
 			LogPrint (eLogWarning, "Garlic: Payload section AEAD encryption failed");
 			return false;
@@ -578,16 +657,33 @@ namespace garlic
 			return false;
 		}
 		MixKey (sharedSecret);
+#if OPENSSL_PQ
+		if (m_PQKeys)
+		{
+			size_t cipherTextLen = i2p::crypto::GetMLKEMCipherTextLen (m_RemoteStaticKeyType);
+			std::vector<uint8_t> kemCiphertext(cipherTextLen);
+			m_PQKeys->Encaps (kemCiphertext.data (), sharedSecret);
+			
+			if (!Encrypt (kemCiphertext.data (), out + offset, cipherTextLen))
+			{
+				LogPrint (eLogWarning, "Garlic: NSR ML-KEM ciphertext section AEAD encryption failed");
+				return false;
+			}
+			m_NSREncodedPQKey = std::make_unique<std::vector<uint8_t> > (cipherTextLen + 16);
+			memcpy (m_NSREncodedPQKey->data (), out + offset, cipherTextLen + 16);
+			MixHash (out + offset, cipherTextLen + 16);
+			MixKey (sharedSecret);
+			offset += cipherTextLen + 16;
+		}	
+#endif		
 		if (!m_EphemeralKeys->Agree (m_RemoteStaticKey, sharedSecret)) // sharedSecret = x25519(besk, apk)
 		{
 			LogPrint (eLogWarning, "Garlic: Incorrect Alice static key");
 			return false;
 		}
 		MixKey (sharedSecret);
-		uint8_t nonce[12];
-		CreateNonce (0, nonce);
 		// calculate hash for zero length
-		if (!i2p::crypto::AEADChaCha20Poly1305 (nonce /* can be anything */, 0, m_H, 32, m_CK + 32, nonce, out + offset, 16, true)) // encrypt, ciphertext = ENCRYPT(k, n, ZEROLEN, ad)
+		if (!Encrypt (sharedSecret /* can be anything */, out + offset, 0)) // encrypt, ciphertext = ENCRYPT(k, n, ZEROLEN, ad)
 		{
 			LogPrint (eLogWarning, "Garlic: Reply key section AEAD encryption failed");
 			return false;
@@ -608,6 +704,7 @@ namespace garlic
 			GetOwner ()->GetNumRatchetInboundTags () : ECIESX25519_MIN_NUM_GENERATED_TAGS);
 		i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", m_NSRKey, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
 		// encrypt payload
+		uint8_t nonce[12]; memset (nonce, 0, 12); // seqn = 0
 		if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_NSRKey, nonce, out + offset, len + 16, true)) // encrypt
 		{
 			LogPrint (eLogWarning, "Garlic: NSR payload section AEAD encryption failed");
@@ -629,16 +726,34 @@ namespace garlic
 		memcpy (m_H, m_NSRH, 32);
 		MixHash ((const uint8_t *)&tag, 8); // h = SHA256(h || tag)
 		MixHash (m_EphemeralKeys->GetPublicKey (), 32); // h = SHA256(h || bepk)
-		uint8_t nonce[12];
+		m_N = 0;
-		CreateNonce (0, nonce);
+		size_t offset = 40;
-		if (!i2p::crypto::AEADChaCha20Poly1305 (nonce /* can be anything */, 0, m_H, 32, m_CK + 32, nonce, out + 40, 16, true)) // encrypt, ciphertext = ENCRYPT(k, n, ZEROLEN, ad)
+#if OPENSSL_PQ		
+		if (m_PQKeys)
+		{	
+			if (m_NSREncodedPQKey)
+			{	
+				size_t cipherTextLen = i2p::crypto::GetMLKEMCipherTextLen (m_RemoteStaticKeyType);
+				memcpy (out + offset, m_NSREncodedPQKey->data (), cipherTextLen + 16);
+				MixHash (out + offset, cipherTextLen + 16);
+				offset += cipherTextLen + 16;
+			}
+			else
+			{
+				LogPrint (eLogWarning, "Garlic: No stored ML-KEM keys");
+				return false;
+			}
+		}
+#endif
+		if (!Encrypt (m_NSRH /* can be anything */, out + offset, 0)) // encrypt, ciphertext = ENCRYPT(k, n, ZEROLEN, ad)
 		{
 			LogPrint (eLogWarning, "Garlic: Reply key section AEAD encryption failed");
 			return false;
 		}
-		MixHash (out + 40, 16); // h = SHA256(h || ciphertext)
+		MixHash (out + offset, 16); // h = SHA256(h || ciphertext)
 		// encrypt payload
-		if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_NSRKey, nonce, out + 56, len + 16, true)) // encrypt
+		uint8_t nonce[12]; memset (nonce, 0, 12);
+		if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_NSRKey, nonce, out + offset + 16, len + 16, true)) // encrypt
 		{
 			LogPrint (eLogWarning, "Garlic: Next NSR payload section AEAD encryption failed");
 			return false;
@@ -670,13 +785,30 @@ namespace garlic
 			return false;
 		}
 		MixKey (sharedSecret);
-		GetOwner ()->Decrypt (bepk, sharedSecret, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD); // x25519 (ask, bepk)
+#if OPENSSL_PQ
+		if (m_RemoteStaticKeyType >= i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD)
+		{
+			// decrypt kem_ciphertext section
+			size_t cipherTextLen = i2p::crypto::GetMLKEMCipherTextLen (m_RemoteStaticKeyType);
+			std::vector<uint8_t> kemCiphertext(cipherTextLen);
+			if (!Decrypt (buf, kemCiphertext.data (), cipherTextLen))
+			{
+				LogPrint (eLogWarning, "Garlic: Reply ML-KEM ciphertext section AEAD decryption failed");
+				return false;
+			}
+			MixHash (buf, cipherTextLen + 16);
+			buf += cipherTextLen + 16;
+			len -= cipherTextLen + 16;
+			// decaps
+			m_PQKeys->Decaps (kemCiphertext.data (), sharedSecret);
+			MixKey (sharedSecret);
+		}
+#endif	
+		GetOwner ()->Decrypt (bepk, sharedSecret, m_RemoteStaticKeyType); // x25519 (ask, bepk)
 		MixKey (sharedSecret);
 		
-		uint8_t nonce[12];
-		CreateNonce (0, nonce);
 		// calculate hash for zero length
-		if (!i2p::crypto::AEADChaCha20Poly1305 (buf, 0, m_H, 32, m_CK + 32, nonce, sharedSecret/* can be anything */, 0, false)) // decrypt, DECRYPT(k, n, ZEROLEN, ad) verification only
+		if (!Decrypt (buf, sharedSecret/* can be anything */, 0)) // decrypt, DECRYPT(k, n, ZEROLEN, ad) verification only
 		{
 			LogPrint (eLogWarning, "Garlic: Reply key section AEAD decryption failed");
 			return false;
@@ -701,6 +833,7 @@ namespace garlic
 		}
 		i2p::crypto::HKDF (keydata + 32, nullptr, 0, "AttachPayloadKDF", keydata, 32); // k = HKDF(k_ba, ZEROLEN, "AttachPayloadKDF", 32)
 		// decrypt payload
+		uint8_t nonce[12]; memset (nonce, 0, 12); // seqn = 0
 		if (!i2p::crypto::AEADChaCha20Poly1305 (buf, len - 16, m_H, 32, keydata, nonce, buf, len - 16, false)) // decrypt
 		{
 			LogPrint (eLogWarning, "Garlic: Payload section AEAD decryption failed");
@@ -710,7 +843,8 @@ namespace garlic
 		if (m_State == eSessionStateNewSessionSent)
 		{
 			m_State = eSessionStateEstablished;
-			//m_EphemeralKeys = nullptr; // TODO: delete after a while
+			// don't delete m_EpehemralKey and m_PQKeys because delayd NSR's migth come
+			// done in CleanupReceiveNSRKeys called from NSR tagset destructor		
 			m_SessionCreatedTimestamp = i2p::util::GetSecondsSinceEpoch ();
 			GetOwner ()->AddECIESx25519Session (m_RemoteStaticKey, shared_from_this ());
 		}
@@ -803,6 +937,10 @@ namespace garlic
 				m_State = eSessionStateEstablished;
 				m_NSRSendTagset = nullptr;
 				m_EphemeralKeys = nullptr;
+#if OPENSSL_PQ
+				m_PQKeys = nullptr;
+				m_NSREncodedPQKey = nullptr;
+#endif				
 				[[fallthrough]];
 			case eSessionStateEstablished:
 				if (m_SendReverseKey && receiveTagset->GetTagSetID () == m_NextReceiveRatchet->GetReceiveTagSetID ())
@@ -833,7 +971,12 @@ namespace garlic
 		if (!payload) return nullptr;
 		size_t len = CreatePayload (msg, m_State != eSessionStateEstablished, payload);
 		if (!len) return nullptr;
+#if OPENSSL_PQ
+		auto m = NewI2NPMessage (len + (m_State == eSessionStateEstablished ? 28 :
+			i2p::crypto::GetMLKEMPublicKeyLen (m_RemoteStaticKeyType) + 116));
+#else		
 		auto m = NewI2NPMessage (len + 100); // 96 + 4
+#endif		
 		m->Align (12); // in order to get buf aligned to 16 (12 + 4)
 		uint8_t * buf = m->GetPayload () + 4; // 4 bytes for length
 
@@ -848,16 +991,28 @@ namespace garlic
 				if (!NewOutgoingSessionMessage (payload, len, buf, m->maxLen))
 					return nullptr;
 				len += 96;
+#if OPENSSL_PQ
+				if (m_RemoteStaticKeyType >= i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD)
+					len += i2p::crypto::GetMLKEMPublicKeyLen (m_RemoteStaticKeyType) + 16;
+#endif				
 			break;
 			case eSessionStateNewSessionReceived:
 				if (!NewSessionReplyMessage (payload, len, buf, m->maxLen))
 					return nullptr;
 				len += 72;
+#if OPENSSL_PQ
+				if (m_RemoteStaticKeyType >= i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD)
+					len += i2p::crypto::GetMLKEMCipherTextLen (m_RemoteStaticKeyType) + 16;
+#endif				
 			break;
 			case eSessionStateNewSessionReplySent:
 				if (!NextNewSessionReplyMessage (payload, len, buf, m->maxLen))
 					return nullptr;
 				len += 72;
+#if OPENSSL_PQ
+				if (m_RemoteStaticKeyType >= i2p::data::CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD)
+					len += i2p::crypto::GetMLKEMCipherTextLen (m_RemoteStaticKeyType) + 16;
+#endif				
 			break;
 			case eSessionStateOneTime:
 				if (!NewOutgoingSessionMessage (payload, len, buf, m->maxLen, false))
@@ -913,7 +1068,7 @@ namespace garlic
 			}
 		}
 		if (!sendAckRequest && !first &&
-		    ((!m_AckRequestMsgID && ts > m_LastAckRequestSendTime + ECIESX25519_ACK_REQUEST_INTERVAL) || // regular request
+		    ((!m_AckRequestMsgID && ts > m_LastAckRequestSendTime + m_AckRequestInterval) || // regular request
 		     (m_AckRequestMsgID && ts > m_LastAckRequestSendTime + LEASESET_CONFIRMATION_TIMEOUT))) // previous request failed. try again
 		{	
 			// not LeaseSet

libi2pd/ECIESX25519AEADRatchetSession.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -14,10 +14,12 @@
 #include <functional>
 #include <memory>
 #include <vector>
+#include <array>
 #include <list>
 #include <unordered_map>
 #include "Identity.h"
 #include "Crypto.h"
+#include "PostQuantum.h"
 #include "Garlic.h"
 #include "Tag.h"
 
@@ -33,7 +35,7 @@ namespace garlic
 	const int ECIESX25519_SESSION_CREATE_TIMEOUT = 3; // in seconds, NSR must be send after NS received
 	const int ECIESX25519_SESSION_ESTABLISH_TIMEOUT = 15; // in seconds 
 	const int ECIESX25519_PREVIOUS_TAGSET_EXPIRATION_TIMEOUT = 180; // in seconds
-	const int ECIESX25519_ACK_REQUEST_INTERVAL = 33000; // in milliseconds
+	const int ECIESX25519_DEFAULT_ACK_REQUEST_INTERVAL = 33000; // in milliseconds
 	const int ECIESX25519_ACK_REQUEST_MAX_NUM_ATTEMPTS = 3;
 	const int ECIESX25519_TAGSET_MAX_NUM_TAGS = 8192; // number of tags we request new tagset after
 	const int ECIESX25519_MIN_NUM_GENERATED_TAGS = 24;
@@ -79,8 +81,8 @@ namespace garlic
 	{
 		public:
 
-			ReceiveRatchetTagSet (std::shared_ptr<ECIESX25519AEADRatchetSession> session, bool isNS = false):
+			ReceiveRatchetTagSet (std::shared_ptr<ECIESX25519AEADRatchetSession> session, bool isNS = false);
-				m_Session (session), m_IsNS (isNS) {};
+			~ReceiveRatchetTagSet () override;
 
 			bool IsNS () const { return m_IsNS; };
 			std::shared_ptr<ECIESX25519AEADRatchetSession> GetSession () { return m_Session; };
@@ -164,27 +166,32 @@ namespace garlic
 			~ECIESX25519AEADRatchetSession ();
 
 			bool HandleNextMessage (uint8_t * buf, size_t len, std::shared_ptr<ReceiveRatchetTagSet> receiveTagset, int index = 0);
-			std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg);
+			std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg) override;
 			std::shared_ptr<I2NPMessage> WrapOneTimeMessage (std::shared_ptr<const I2NPMessage> msg);
 
 			const uint8_t * GetRemoteStaticKey () const { return m_RemoteStaticKey; }
-			void SetRemoteStaticKey (const uint8_t * key) { memcpy (m_RemoteStaticKey, key, 32); }
+			i2p::data::CryptoKeyType GetRemoteStaticKeyType () const { return m_RemoteStaticKeyType; }
-
+			void SetRemoteStaticKey (i2p::data::CryptoKeyType keyType, const uint8_t * key) 
+			{ 
+				m_RemoteStaticKeyType = keyType;
+				memcpy (m_RemoteStaticKey, key, 32); 
+			}
 			void Terminate () { m_IsTerminated = true; }
 			void SetDestination (const i2p::data::IdentHash& dest)
 			{
 				if (!m_Destination) m_Destination.reset (new i2p::data::IdentHash (dest));
 			}
-
 			bool CheckExpired (uint64_t ts); // true is expired
 			bool CanBeRestarted (uint64_t ts) const { return ts > m_SessionCreatedTimestamp + ECIESX25519_RESTART_TIMEOUT; }
 			bool IsInactive (uint64_t ts) const { return ts > m_LastActivityTimestamp + ECIESX25519_INACTIVITY_TIMEOUT && CanBeRestarted (ts); }
+			void CleanupReceiveNSRKeys (); // called from ReceiveRatchetTagSet at Alice's side
 			
-			bool IsRatchets () const { return true; };
+			bool IsRatchets () const override { return true; };
-			bool IsReadyToSend () const { return m_State != eSessionStateNewSessionSent; };
+			bool IsReadyToSend () const override { return m_State != eSessionStateNewSessionSent; };
-			bool IsTerminated () const { return m_IsTerminated; }
+			bool IsTerminated () const override { return m_IsTerminated; }
-			uint64_t GetLastActivityTimestamp () const { return m_LastActivityTimestamp; };
+			uint64_t GetLastActivityTimestamp () const override { return m_LastActivityTimestamp; };
-			bool CleanupUnconfirmedTags (); // return true if unaswered Ack requests, called from I2CP
+			void SetAckRequestInterval (int interval) override { m_AckRequestInterval = interval; };
+			bool CleanupUnconfirmedTags () override; // return true if unaswered Ack requests, called from I2CP
 			
 		protected:
 
@@ -192,7 +199,7 @@ namespace garlic
 			void SetNoiseState (const i2p::crypto::NoiseSymmetricState& state) { GetNoiseState () = state; };
 			void CreateNonce (uint64_t seqn, uint8_t * nonce);
 			void HandlePayload (const uint8_t * buf, size_t len, const std::shared_ptr<ReceiveRatchetTagSet>& receiveTagset, int index);
-			bool MessageConfirmed (uint32_t msgID);
+			bool MessageConfirmed (uint32_t msgID) override;
 			
 		private:
 
@@ -218,10 +225,15 @@ namespace garlic
 
 		private:
 
+			i2p::data::CryptoKeyType m_RemoteStaticKeyType;
 			uint8_t m_RemoteStaticKey[32];
 			uint8_t m_Aepk[32]; // Alice's ephemeral keys, for incoming only
 			uint8_t m_NSREncodedKey[32], m_NSRH[32], m_NSRKey[32]; // new session reply, for incoming only
 			std::shared_ptr<i2p::crypto::X25519Keys> m_EphemeralKeys;
+#if OPENSSL_PQ	
+			std::unique_ptr<i2p::crypto::MLKEMKeys> m_PQKeys;
+			std::unique_ptr<std::vector<uint8_t> > m_NSREncodedPQKey;
+#endif			
 			SessionState m_State = eSessionStateNew;
 			uint64_t m_SessionCreatedTimestamp = 0, m_LastActivityTimestamp = 0, // incoming (in seconds)
 				m_LastSentTimestamp = 0; // in milliseconds
@@ -235,6 +247,7 @@ namespace garlic
 			uint64_t m_LastAckRequestSendTime = 0; // milliseconds
 			uint32_t m_AckRequestMsgID = 0; 
 			int m_AckRequestNumAttempts = 0;
+			int m_AckRequestInterval = ECIESX25519_DEFAULT_ACK_REQUEST_INTERVAL; // milliseconds
 			
 		public:
 

libi2pd/FS.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -15,6 +15,10 @@
 #include <TargetConditionals.h>
 #endif
 
+#if defined(__HAIKU__)
+#include <FindDirectory.h>
+#endif
+
 #ifdef _WIN32
 #include <shlobj.h>
 #include <windows.h>
@@ -169,12 +173,11 @@ namespace fs {
 		dataDir += "/Library/Application Support/" + appName;
 		return;
 #elif defined(__HAIKU__)
-		char *home = getenv("HOME");
+		char home[PATH_MAX]; // /boot/home/config/settings
-		if (home != NULL && strlen(home) > 0) {
+		if (find_directory(B_USER_SETTINGS_DIRECTORY, -1, false, home, PATH_MAX) == B_OK)	
-			dataDir = std::string(home) + "/config/settings/" + appName;
+			dataDir = std::string(home) + "/" + appName;
-		} else {
+		else
 			dataDir = "/tmp/" + appName;
-		}
 		return;
 #else /* other unix */
 #if defined(ANDROID)

libi2pd/Family.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -90,10 +90,10 @@ namespace data
 	}
 
 	bool Families::VerifyFamily (const std::string& family, const IdentHash& ident,
-		const char * signature, const char * key) const
+		std::string_view signature, const char * key) const
 	{
 		uint8_t buf[100], signatureBuf[64];
-		size_t len = family.length (), signatureLen = strlen (signature);
+		size_t len = family.length ();
 		if (len + 32 > 100)
 		{
 			LogPrint (eLogError, "Family: ", family, " is too long");
@@ -105,7 +105,7 @@ namespace data
 			memcpy (buf, family.c_str (), len);
 			memcpy (buf + len, (const uint8_t *)ident, 32);
 			len += 32;
-			auto signatureBufLen = Base64ToByteStream (signature, signatureLen, signatureBuf, 64);
+			auto signatureBufLen = Base64ToByteStream (signature, signatureBuf, 64);
 			if (signatureBufLen)
 			{
 				EVP_MD_CTX * ctx = EVP_MD_CTX_create ();
@@ -154,12 +154,7 @@ namespace data
 						memcpy (buf + len, (const uint8_t *)ident, 32);
 						len += 32;
 						signer.Sign (buf, len, signature);
-						len = Base64EncodingBufferSize (64);
+						sig = ByteStreamToBase64 (signature, 64);
-						char * b64 = new char[len+1];
-						len = ByteStreamToBase64 (signature, 64, b64, len);
-						b64[len] = 0;
-						sig = b64;
-						delete[] b64;
 					}
 					else
 						LogPrint (eLogWarning, "Family: elliptic curve ", curve, " is not supported");

libi2pd/Family.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,6 +11,7 @@
 
 #include <map>
 #include <string>
+#include <string_view>
 #include <memory>
 #include <openssl/evp.h>
 #include "Identity.h"
@@ -28,7 +29,7 @@ namespace data
 			~Families ();
 			void LoadCertificates ();
 			bool VerifyFamily (const std::string& family, const IdentHash& ident,
-				const char * signature, const char * key = nullptr) const;
+				std::string_view signature, const char * key = nullptr) const;
 			FamilyID GetFamilyID (const std::string& family) const;
 
 		private:

libi2pd/Garlic.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -498,7 +498,8 @@ namespace garlic
 		buf += 4; // length
 
 		bool found = false;
-		if (SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD))
+		bool supportsRatchets = SupportsRatchets ();
+		if (supportsRatchets)
 			// try ECIESx25519 tag
 			found = HandleECIESx25519TagMessage (buf, length);
 		if (!found)
@@ -535,7 +536,7 @@ namespace garlic
 					decryption->Decrypt(buf + 514, length - 514, iv, buf + 514);
 					HandleAESBlock (buf + 514, length - 514, decryption, msg->from);
 				}
-				else if (SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD))
+				else if (supportsRatchets)
 				{
 					// otherwise ECIESx25519
 					auto ts = i2p::util::GetMillisecondsSinceEpoch ();
@@ -747,31 +748,35 @@ namespace garlic
 		std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet,
 	    bool requestNewIfNotFound)
 	{
-		if (destination->GetEncryptionType () == i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD &&
+		if (destination->GetEncryptionType () >= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)
-			SupportsEncryptionType (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD))
 		{
-			ECIESX25519AEADRatchetSessionPtr session;
+			if (SupportsEncryptionType (destination->GetEncryptionType ()))
-			uint8_t staticKey[32];
-			destination->Encrypt (nullptr, staticKey); // we are supposed to get static key
-			auto it = m_ECIESx25519Sessions.find (staticKey);
-			if (it != m_ECIESx25519Sessions.end ())
 			{	
-				session = it->second;
+				ECIESX25519AEADRatchetSessionPtr session;
-				if (session->IsInactive (i2p::util::GetSecondsSinceEpoch ()))
+				uint8_t staticKey[32];
+				destination->Encrypt (nullptr, staticKey); // we are supposed to get static key
+				auto it = m_ECIESx25519Sessions.find (staticKey);
+				if (it != m_ECIESx25519Sessions.end ())
 				{
-					LogPrint (eLogDebug, "Garlic: Session restarted");
+					session = it->second;
-					requestNewIfNotFound = true; // it's not a new session
+					if (session->IsInactive (i2p::util::GetSecondsSinceEpoch ()))
-					session = nullptr;
+					{
+						LogPrint (eLogDebug, "Garlic: Session restarted");
+						requestNewIfNotFound = true; // it's not a new session
+						session = nullptr;
+					}
 				}
+				if (!session && requestNewIfNotFound)
+				{
+					session = std::make_shared<ECIESX25519AEADRatchetSession> (this, true);
+					session->SetRemoteStaticKey (destination->GetEncryptionType (), staticKey);
+				}
+				if (session && destination->IsDestination ())
+					session->SetDestination (destination->GetIdentHash ()); // NS or NSR
+				return session;
 			}
-			if (!session && requestNewIfNotFound)
+			else
-			{
+				LogPrint (eLogError, "Garlic: Non-supported encryption type ", destination->GetEncryptionType ());
-				session = std::make_shared<ECIESX25519AEADRatchetSession> (this, true);
-				session->SetRemoteStaticKey (staticKey);
-			}
-			if (session && destination->IsDestination ())
-				session->SetDestination (destination->GetIdentHash ()); // NS or NSR
-			return session;
 		}
 		else
 		{
@@ -999,7 +1004,8 @@ namespace garlic
 				i2p::fs::Remove (it);
 	}
 
-	void GarlicDestination::HandleECIESx25519GarlicClove (const uint8_t * buf, size_t len)
+	void GarlicDestination::HandleECIESx25519GarlicClove (const uint8_t * buf, size_t len,
+		ECIESX25519AEADRatchetSession * from)
 	{
 		const uint8_t * buf1 = buf;
 		uint8_t flag = buf[0]; buf++; // flag
@@ -1019,7 +1025,7 @@ namespace garlic
 				buf += 4; // expiration
 				ptrdiff_t offset = buf - buf1;
 				if (offset <= (int)len)
-					HandleCloveI2NPMessage (typeID, buf, len - offset, msgID);
+					HandleCloveI2NPMessage (typeID, buf, len - offset, msgID, from);
 				else
 					LogPrint (eLogError, "Garlic: Clove is too long");
 				break;

libi2pd/Garlic.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -116,6 +116,7 @@ namespace garlic
 			virtual bool IsReadyToSend () const { return true; };
 			virtual bool IsTerminated () const { return !GetOwner (); };
 			virtual uint64_t GetLastActivityTimestamp () const { return 0; }; // non-zero for rathets only
+			virtual void SetAckRequestInterval (int interval) {}; // in milliseconds, override in ECIESX25519AEADRatchetSession
 			
 			void SetLeaseSetUpdated ()
 			{
@@ -256,7 +257,7 @@ namespace garlic
 			uint64_t AddECIESx25519SessionNextTag (ReceiveRatchetTagSetPtr tagset);
 			void AddECIESx25519Session (const uint8_t * staticKey, ECIESX25519AEADRatchetSessionPtr session);
 			void RemoveECIESx25519Session (const uint8_t * staticKey);
-			void HandleECIESx25519GarlicClove (const uint8_t * buf, size_t len);
+			void HandleECIESx25519GarlicClove (const uint8_t * buf, size_t len, ECIESX25519AEADRatchetSession * from);
 			uint8_t * GetPayloadBuffer ();
 
 			virtual void ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg);
@@ -265,13 +266,18 @@ namespace garlic
 
 			virtual std::shared_ptr<const i2p::data::LocalLeaseSet> GetLeaseSet () = 0; // TODO
 			virtual std::shared_ptr<i2p::tunnel::TunnelPool> GetTunnelPool () const = 0;
+			virtual i2p::data::CryptoKeyType GetRatchetsHighestCryptoType () const 
+			{
+				return GetIdentity ()->GetCryptoKeyType () >= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ? GetIdentity ()->GetCryptoKeyType () : 0;
+			}	
 
 		protected:
 
 			void AddECIESx25519Key (const uint8_t * key, const uint8_t * tag); // one tag
 			bool HandleECIESx25519TagMessage (uint8_t * buf, size_t len); // return true if found
 			virtual void HandleI2NPMessage (const uint8_t * buf, size_t len) = 0; // called from clove only
-			virtual bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, size_t len, uint32_t msgID) = 0;
+			virtual bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, 
+				size_t len, uint32_t msgID, ECIESX25519AEADRatchetSession * from) = 0;
 			void HandleGarlicMessage (std::shared_ptr<I2NPMessage> msg);
 			void HandleDeliveryStatusMessage (uint32_t msgID);
 
@@ -280,6 +286,7 @@ namespace garlic
 			
 		private:
 
+			bool SupportsRatchets () const { return GetRatchetsHighestCryptoType () > 0; }
 			void HandleAESBlock (uint8_t * buf, size_t len, std::shared_ptr<AESDecryption> decryption,
 				std::shared_ptr<i2p::tunnel::InboundTunnel> from);
 			void HandleGarlicPayload (uint8_t * buf, size_t len, std::shared_ptr<i2p::tunnel::InboundTunnel> from);

libi2pd/HTTP.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -10,6 +10,7 @@
 #include <utility>
 #include <stdio.h>
 #include <ctime>
+#include <charconv>
 #include "util.h"
 #include "Base.h"
 #include "HTTP.h"
@@ -18,54 +19,51 @@ namespace i2p
 {
 namespace http
 {
-	const std::vector<std::string> HTTP_METHODS = {
+	// list of valid HTTP methods
+	static constexpr std::array<std::string_view, 16> HTTP_METHODS = 
+	{
 		"GET", "HEAD", "POST", "PUT", "PATCH", "DELETE", "OPTIONS", "CONNECT", // HTTP basic methods
 		"COPY", "LOCK", "MKCOL", "MOVE", "PROPFIND", "PROPPATCH", "UNLOCK", "SEARCH" // WebDAV methods, for SEARCH see rfc5323
 	};
-	const std::vector<std::string> HTTP_VERSIONS = {
+
+	// list of valid HTTP versions
+	static constexpr std::array<std::string_view, 2> HTTP_VERSIONS = 
+	{
 		"HTTP/1.0", "HTTP/1.1"
 	};
-	const std::vector<const char *> weekdays = {
+	
+	static constexpr std::array<const char *, 7> weekdays = 
+	{
 		"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
 	};
-	const std::vector<const char *> months = {
+	
+	static constexpr std::array<const char *, 12> months = 
+	{
 		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
 		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
 	};
 
-	inline bool is_http_version(const std::string & str) {
+	static inline bool is_http_version(std::string_view str) 
+	{
 		return std::find(HTTP_VERSIONS.begin(), HTTP_VERSIONS.end(), str) != std::end(HTTP_VERSIONS);
 	}
 
-	inline bool is_http_method(const std::string & str) {
+	static inline bool is_http_method(std::string_view str) 
+	{
 		return std::find(HTTP_METHODS.begin(), HTTP_METHODS.end(), str) != std::end(HTTP_METHODS);
 	}
 	
-	static void strsplit(std::stringstream& ss, std::vector<std::string> &tokens, char delim, std::size_t limit = 0) 	
+	static void strsplit(std::string_view line, std::vector<std::string_view> &tokens, char delim, std::size_t limit = 0) 
 	{	
-		std::size_t count = 0;
+		size_t count = 0, pos;
-		std::string token;
+		while ((pos = line.find (delim)) != line.npos)
-		while (1) 
 		{
 			count++;
-			if (limit > 0 && count >= limit)
+			if (limit > 0 && count >= limit) delim = '\n'; // reset delimiter
-				delim = '\n'; /* reset delimiter */
+			tokens.push_back (line.substr (0, pos));
-			if (!std::getline(ss, token, delim))
+			line = line.substr (pos + 1);	
-				break;
-			tokens.push_back(token);
 		}
-	}
+		if (!line.empty ()) tokens.push_back (line);
-
-	static void strsplit(const std::string & line, std::vector<std::string> &tokens, char delim, std::size_t limit = 0) 
-	{
-		std::stringstream ss{line};
-		strsplit (ss, tokens, delim, limit);
-	}
-
-	static void strsplit(std::string_view line, std::vector<std::string> &tokens, char delim, std::size_t limit = 0) 
-	{	
-		std::stringstream ss{std::string(line)};
-		strsplit (ss, tokens, delim, limit);
 	}
 	
 	static std::pair<std::string, std::string> parse_header_line(std::string_view line)
@@ -211,8 +209,9 @@ namespace http
 		return true;
 	}
 
-	bool URL::parse_query(std::map<std::string, std::string> & params) {
+	bool URL::parse_query(std::map<std::string, std::string> & params) 
-		std::vector<std::string> tokens;
+	{
+		std::vector<std::string_view> tokens;
 		strsplit(query, tokens, '&');
 
 		params.clear();
@@ -308,8 +307,9 @@ namespace http
 			if (expect == REQ_LINE) 
 			{
 				std::string_view line = str.substr(pos, eol - pos);
-				std::vector<std::string> tokens;
+				std::vector<std::string_view> tokens;
 				strsplit(line, tokens, ' ');
+				
 				if (tokens.size() != 3)
 					return -1;
 				if (!is_http_method(tokens[0]))
@@ -333,11 +333,11 @@ namespace http
 				else
 					return -1;
 			}
-			pos = eol + strlen(CRLF);
+			pos = eol + CRLF.length();
 			if (pos >= eoh)
 				break;
 		}
-		return eoh + strlen(HTTP_EOH);
+		return eoh + HTTP_EOH.length();
 	}
 
 	void HTTPReq::write(std::ostream & o)
@@ -381,7 +381,7 @@ namespace http
 		}
 	}
 
-	std::string HTTPReq::GetHeader (const std::string& name) const
+	std::string HTTPReq::GetHeader (std::string_view name) const
 	{
 		for (auto& it : headers)
 			if (it.first == name)
@@ -389,7 +389,7 @@ namespace http
 		return "";
 	}
 
-	size_t HTTPReq::GetNumHeaders (const std::string& name) const
+	size_t HTTPReq::GetNumHeaders (std::string_view name) const
 	{
 		size_t num = 0;
 		for (auto& it : headers)
@@ -451,13 +451,15 @@ namespace http
 			if (expect == RES_LINE) 
 			{
 				std::string_view line = str.substr(pos, eol - pos);
-				std::vector<std::string> tokens;
+				std::vector<std::string_view> tokens;
 				strsplit(line, tokens, ' ', 3);
 				if (tokens.size() != 3)
 					return -1;
 				if (!is_http_version(tokens[0]))
 					return -1;
-				code = atoi(tokens[1].c_str());
+				auto res = std::from_chars(tokens[1].data (), tokens[1].data() + tokens[1].size(), code);
+				if (res.ec != std::errc())
+					return -1;
 				if (code < 100 || code >= 600)
 					return -1;
 				/* all ok */
@@ -474,11 +476,11 @@ namespace http
 				else
 					return -1;
 			}
-			pos = eol + strlen(CRLF);
+			pos = eol + CRLF.length();
 			if (pos >= eoh)
 				break;
 		}
-		return eoh + strlen(HTTP_EOH);
+		return eoh + HTTP_EOH.length();
 	}
 
 	std::string HTTPRes::to_string() {
@@ -503,9 +505,11 @@ namespace http
 		return ss.str();
 	}
 
-	const char * HTTPCodeToStatus(int code) {
+	std::string_view HTTPCodeToStatus(int code) 
-		const char *ptr;
+	{
-		switch (code) {
+		std::string_view ptr;
+		switch (code) 
+		{
 			case 105: ptr = "Name Not Resolved"; break;
 			/* success */
 			case 200: ptr = "OK"; break;

libi2pd/HTTP.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -21,10 +21,8 @@ namespace i2p
 {
 namespace http
 {
-	const char CRLF[] = "\r\n";         /**< HTTP line terminator */
+	constexpr std::string_view CRLF = "\r\n";         /**< HTTP line terminator */
-	const char HTTP_EOH[] = "\r\n\r\n"; /**< HTTP end-of-headers mark */
+	constexpr std::string_view HTTP_EOH = "\r\n\r\n"; /**< HTTP end-of-headers mark */
-	extern const std::vector<std::string> HTTP_METHODS;  /**< list of valid HTTP methods */
-	extern const std::vector<std::string> HTTP_VERSIONS; /**< list of valid HTTP versions */
 
 	struct URL
 	{
@@ -103,8 +101,8 @@ namespace http
 		void UpdateHeader (const std::string& name, const std::string& value);
 		void RemoveHeader (const std::string& name, const std::string& exempt); // remove all headers starting with name, but exempt
 		void RemoveHeader (const std::string& name) { RemoveHeader (name, ""); };
-		std::string GetHeader (const std::string& name) const;
+		std::string GetHeader (std::string_view name) const;
-		size_t GetNumHeaders (const std::string& name) const;
+		size_t GetNumHeaders (std::string_view name) const;
 		size_t GetNumHeaders () const { return headers.size (); };
 	};
 
@@ -154,7 +152,7 @@ namespace http
 	 * @param code HTTP code [100, 599]
 	 * @return Immutable string with status
 	 */
-	const char * HTTPCodeToStatus(int code);
+	std::string_view HTTPCodeToStatus(int code);
 
 	/**
 	 * @brief Replaces %-encoded characters in string with their values

libi2pd/Identity.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -10,6 +10,7 @@
 #include "I2PEndian.h"
 #include "Log.h"
 #include "Timestamp.h"
+#include "CryptoKey.h"
 #include "Identity.h"
 
 namespace i2p
@@ -27,18 +28,15 @@ namespace data
 
 	size_t Identity::FromBuffer (const uint8_t * buf, size_t len)
 	{
-		if ( len < DEFAULT_IDENTITY_SIZE ) {
+		if (len < DEFAULT_IDENTITY_SIZE) return 0; // buffer too small, don't overflow
-			// buffer too small, don't overflow
+		memcpy (this, buf, DEFAULT_IDENTITY_SIZE);
-			return 0;
-		}
-		memcpy (publicKey, buf, DEFAULT_IDENTITY_SIZE);
 		return DEFAULT_IDENTITY_SIZE;
 	}
 
 	IdentHash Identity::Hash () const
 	{
 		IdentHash hash;
-		SHA256(publicKey, DEFAULT_IDENTITY_SIZE, hash);
+		SHA256((const uint8_t *)this, DEFAULT_IDENTITY_SIZE, hash);
 		return hash;
 	}
 
@@ -122,6 +120,16 @@ namespace data
 					memcpy (m_StandardIdentity.signingKey, signingKey, i2p::crypto::GOSTR3410_512_PUBLIC_KEY_LENGTH);
 					break;
 				}
+#if OPENSSL_PQ
+				case SIGNING_KEY_TYPE_MLDSA44:
+				{
+					memcpy (m_StandardIdentity, signingKey, 384);
+					excessLen = i2p::crypto::MLDSA44_PUBLIC_KEY_LENGTH - 384;
+					excessBuf = new uint8_t[excessLen];
+					memcpy (excessBuf, signingKey + 384, excessLen);
+					break;
+				}	
+#endif					
 				default:
 					LogPrint (eLogError, "Identity: Signing key type ", (int)type, " is not supported");
 			}
@@ -262,23 +270,19 @@ namespace data
 		return fullLen;
 	}
 
-	size_t IdentityEx::FromBase64(const std::string& s)
+	size_t IdentityEx::FromBase64(std::string_view s)
 	{
-		const size_t slen = s.length();
+		std::vector<uint8_t> buf(s.length ()); // binary data can't exceed base64
-		std::vector<uint8_t> buf(slen); // binary data can't exceed base64
+		auto len = Base64ToByteStream (s, buf.data(), buf.size ());
-		const size_t len = Base64ToByteStream (s.c_str(), slen, buf.data(), slen);
 		return FromBuffer (buf.data(), len);
 	}
 
 	std::string IdentityEx::ToBase64 () const
 	{
 		const size_t bufLen = GetFullLen();
-		const size_t strLen = Base64EncodingBufferSize(bufLen);
 		std::vector<uint8_t> buf(bufLen);
-		std::vector<char> str(strLen);
 		size_t l = ToBuffer (buf.data(), bufLen);
-		size_t l1 = i2p::data::ByteStreamToBase64 (buf.data(), l, str.data(), strLen);
+		return i2p::data::ByteStreamToBase64 (buf.data(), l);
-		return std::string (str.data(), l1);
 	}
 
 	size_t IdentityEx::GetSigningPublicKeyLen () const
@@ -355,6 +359,10 @@ namespace data
 				return new i2p::crypto::GOSTR3410_512_Verifier (i2p::crypto::eGOSTR3410TC26A512);
 			case SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519:
 				return new i2p::crypto::RedDSA25519Verifier ();
+#if OPENSSL_PQ				
+			case SIGNING_KEY_TYPE_MLDSA44:
+				return new i2p::crypto::MLDSA44Verifier ();
+#endif				
 			case SIGNING_KEY_TYPE_RSA_SHA256_2048:
 			case SIGNING_KEY_TYPE_RSA_SHA384_3072:
 			case SIGNING_KEY_TYPE_RSA_SHA512_4096:
@@ -376,6 +384,18 @@ namespace data
 				auto keyLen = verifier->GetPublicKeyLen ();
 				if (keyLen <= 128)
 					verifier->SetPublicKey (m_StandardIdentity.signingKey + 128 - keyLen);
+#if OPENSSL_PQ
+				else if (keyLen > 384)
+				{
+					// for post-quantum
+					uint8_t * signingKey = new uint8_t[keyLen];
+					memcpy (signingKey, m_StandardIdentity.signingKey, 384);
+					size_t excessLen = keyLen - 384;
+					memcpy (signingKey + 384, m_ExtendedBuffer + 4, excessLen); // right after signing and crypto key types
+					verifier->SetPublicKey (signingKey);
+					delete[] signingKey;
+				}	
+#endif				
 				else
 				{
 					// for P521
@@ -399,15 +419,14 @@ namespace data
 				return std::make_shared<i2p::crypto::ElGamalEncryptor>(key);
 			break;
 			case CRYPTO_KEY_TYPE_ECIES_X25519_AEAD:
+			case CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD:
+			case CRYPTO_KEY_TYPE_ECIES_MLKEM768_X25519_AEAD:
+			case CRYPTO_KEY_TYPE_ECIES_MLKEM1024_X25519_AEAD:	
 				return std::make_shared<i2p::crypto::ECIESX25519AEADRatchetEncryptor>(key);
 			break;
 			case CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC:
-			case CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC_TEST:
 				return std::make_shared<i2p::crypto::ECIESP256Encryptor>(key);
 			break;
-			case CRYPTO_KEY_TYPE_ECIES_GOSTR3410_CRYPTO_PRO_A_SHA256_AES256CBC:
-				return std::make_shared<i2p::crypto::ECIESGOSTR3410Encryptor>(key);
-			break;
 			default:
 				LogPrint (eLogError, "Identity: Unknown crypto key type ", (int)keyType);
 		};
@@ -551,26 +570,18 @@ namespace data
 		return ret;
 	}
 
-	size_t PrivateKeys::FromBase64(const std::string& s)
+	size_t PrivateKeys::FromBase64(std::string_view s)
 	{
-		uint8_t * buf = new uint8_t[s.length ()];
+		std::vector<uint8_t> buf(s.length ());
-		size_t l = i2p::data::Base64ToByteStream (s.c_str (), s.length (), buf, s.length ());
+		size_t l = i2p::data::Base64ToByteStream (s, buf.data (), buf.size ());
-		size_t ret = FromBuffer (buf, l);
+		return FromBuffer (buf.data (), l);
-		delete[] buf;
-		return ret;
 	}
 
 	std::string PrivateKeys::ToBase64 () const
 	{
-		uint8_t * buf = new uint8_t[GetFullLen ()];
+		std::vector<uint8_t> buf(GetFullLen ());
-		char * str = new char[GetFullLen ()*2];
+		size_t l = ToBuffer (buf.data (), buf.size ());
-		size_t l = ToBuffer (buf, GetFullLen ());
+		return i2p::data::ByteStreamToBase64 (buf.data (), l);
-		size_t l1 = i2p::data::ByteStreamToBase64 (buf, l, str, GetFullLen ()*2);
-		str[l1] = 0;
-		delete[] buf;
-		std::string ret(str);
-		delete[] str;
-		return ret;
 	}
 
 	void PrivateKeys::Sign (const uint8_t * buf, int len, uint8_t * signature) const
@@ -633,6 +644,11 @@ namespace data
 			case SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519:
 				return new i2p::crypto::RedDSA25519Signer (priv);
 			break;
+#if OPENSSL_PQ
+			case SIGNING_KEY_TYPE_MLDSA44:
+				return new i2p::crypto::MLDSA44Signer (priv);
+			break;	
+#endif				
 			default:
 				LogPrint (eLogError, "Identity: Signing key type ", (int)keyType, " is not supported");
 		}
@@ -646,8 +662,7 @@ namespace data
 
 	size_t PrivateKeys::GetPrivateKeyLen () const
 	{
-		// private key length always 256, but type 4
+		return i2p::crypto::GetCryptoPrivateKeyLen (m_Public->GetCryptoKeyType ());
-		return (m_Public->GetCryptoKeyType () == CRYPTO_KEY_TYPE_ECIES_X25519_AEAD) ? 32 : 256;
 	}
 
 	uint8_t * PrivateKeys::GetPadding()
@@ -673,15 +688,14 @@ namespace data
 				return std::make_shared<i2p::crypto::ElGamalDecryptor>(key);
 			break;
 			case CRYPTO_KEY_TYPE_ECIES_X25519_AEAD:
+			case CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD:
+			case CRYPTO_KEY_TYPE_ECIES_MLKEM768_X25519_AEAD:
+			case CRYPTO_KEY_TYPE_ECIES_MLKEM1024_X25519_AEAD:	
 				return std::make_shared<i2p::crypto::ECIESX25519AEADRatchetDecryptor>(key);
 			break;
 			case CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC:
-			case CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC_TEST:
 				return std::make_shared<i2p::crypto::ECIESP256Decryptor>(key);
 			break;
-			case CRYPTO_KEY_TYPE_ECIES_GOSTR3410_CRYPTO_PRO_A_SHA256_AES256CBC:
-				return std::make_shared<i2p::crypto::ECIESGOSTR3410Decryptor>(key);
-			break;
 			default:
 				LogPrint (eLogError, "Identity: Unknown crypto key type ", (int)cryptoType);
 		};
@@ -728,9 +742,7 @@ namespace data
 			case SIGNING_KEY_TYPE_RSA_SHA384_3072:
 			case SIGNING_KEY_TYPE_RSA_SHA512_4096:
 				LogPrint (eLogWarning, "Identity: RSA signature type is not supported. Creating EdDSA");
-#if (__cplusplus >= 201703L) // C++ 17 or higher
 				[[fallthrough]];
-#endif
 				// no break here
 			case SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519:
 				i2p::crypto::CreateEDDSA25519RandomKeys (priv, pub);
@@ -744,6 +756,11 @@ namespace data
 			case SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519:
 				i2p::crypto::CreateRedDSA25519RandomKeys (priv, pub);
 			break;
+#if OPENSSL_PQ				
+			case SIGNING_KEY_TYPE_MLDSA44:
+				i2p::crypto::CreateMLDSA44RandomKeys (priv, pub);
+			break;	
+#endif				
 			default:
 				LogPrint (eLogWarning, "Identity: Signing key type ", (int)type, " is not supported. Create DSA-SHA1");
 				i2p::crypto::CreateDSARandomKeys (priv, pub); // DSA-SHA1
@@ -758,13 +775,12 @@ namespace data
 				i2p::crypto::GenerateElGamalKeyPair(priv, pub);
 			break;
 			case CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC:
-			case CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC_TEST:
 				i2p::crypto::CreateECIESP256RandomKeys (priv, pub);
 			break;
-			case CRYPTO_KEY_TYPE_ECIES_GOSTR3410_CRYPTO_PRO_A_SHA256_AES256CBC:
-				i2p::crypto::CreateECIESGOSTR3410RandomKeys (priv, pub);
-			break;
 			case CRYPTO_KEY_TYPE_ECIES_X25519_AEAD:
+			case CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD:
+			case CRYPTO_KEY_TYPE_ECIES_MLKEM768_X25519_AEAD:
+			case CRYPTO_KEY_TYPE_ECIES_MLKEM1024_X25519_AEAD:	
 				i2p::crypto::CreateECIESX25519AEADRatchetRandomKeys (priv, pub);
 			break;
 			default:

libi2pd/Identity.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -12,14 +12,19 @@
 #include <inttypes.h>
 #include <string.h>
 #include <string>
+#include <string_view>
 #include <memory>
 #include <vector>
 #include "Base.h"
 #include "Signature.h"
-#include "CryptoKey.h"
 
 namespace i2p
 {
+namespace crypto
+{
+	class CryptoKeyEncryptor;
+	class CryptoKeyDecryptor;
+}	
 namespace data
 {
 	typedef Tag<32> IdentHash;
@@ -54,6 +59,8 @@ namespace data
 		Identity& operator=(const Keys& keys);
 		size_t FromBuffer (const uint8_t * buf, size_t len);
 		IdentHash Hash () const;
+		operator uint8_t * () { return reinterpret_cast<uint8_t *>(this); }
+		operator const uint8_t * () const { return reinterpret_cast<const uint8_t *>(this); }
 	};
 
 	Keys CreateRandomKeys ();
@@ -63,8 +70,9 @@ namespace data
 	const uint16_t CRYPTO_KEY_TYPE_ELGAMAL = 0;
 	const uint16_t CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC = 1;
 	const uint16_t CRYPTO_KEY_TYPE_ECIES_X25519_AEAD = 4;
-	const uint16_t CRYPTO_KEY_TYPE_ECIES_P256_SHA256_AES256CBC_TEST = 65280; // TODO: remove later
+	const uint16_t CRYPTO_KEY_TYPE_ECIES_MLKEM512_X25519_AEAD = 5;
-	const uint16_t CRYPTO_KEY_TYPE_ECIES_GOSTR3410_CRYPTO_PRO_A_SHA256_AES256CBC = 65281; // TODO: use GOST R 34.11 instead SHA256 and GOST 28147-89 instead AES
+	const uint16_t CRYPTO_KEY_TYPE_ECIES_MLKEM768_X25519_AEAD = 6;
+	const uint16_t CRYPTO_KEY_TYPE_ECIES_MLKEM1024_X25519_AEAD = 7;
 	
 	const uint16_t SIGNING_KEY_TYPE_DSA_SHA1 = 0;
 	const uint16_t SIGNING_KEY_TYPE_ECDSA_SHA256_P256 = 1;
@@ -74,10 +82,11 @@ namespace data
 	const uint16_t SIGNING_KEY_TYPE_RSA_SHA384_3072 = 5;
 	const uint16_t SIGNING_KEY_TYPE_RSA_SHA512_4096 = 6;
 	const uint16_t SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519 = 7;
-	const uint16_t SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519ph = 8; // not implemented
+	const uint16_t SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519ph = 8; // since openssl 3.0.0
 	const uint16_t SIGNING_KEY_TYPE_GOSTR3410_CRYPTO_PRO_A_GOSTR3411_256 = 9;
 	const uint16_t SIGNING_KEY_TYPE_GOSTR3410_TC26_A_512_GOSTR3411_512 = 10; // approved by FSB
 	const uint16_t SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519 = 11; // for LeaseSet2 only
+	const uint16_t SIGNING_KEY_TYPE_MLDSA44 = 12;
 	
 	typedef uint16_t SigningKeyType;
 	typedef uint16_t CryptoKeyType;
@@ -99,7 +108,7 @@ namespace data
 
 			size_t FromBuffer (const uint8_t * buf, size_t len);
 			size_t ToBuffer (uint8_t * buf, size_t len) const;
-			size_t FromBase64(const std::string& s);
+			size_t FromBase64(std::string_view s);
 			std::string ToBase64 () const;
 			const Identity& GetStandardIdentity () const { return m_StandardIdentity; };
 
@@ -133,7 +142,7 @@ namespace data
 			IdentHash m_IdentHash;
 			std::unique_ptr<i2p::crypto::Verifier> m_Verifier;
 			size_t m_ExtendedLen;
-			uint8_t m_ExtendedBuffer[MAX_EXTENDED_BUFFER_SIZE];
+			uint8_t m_ExtendedBuffer[MAX_EXTENDED_BUFFER_SIZE]; // TODO: support PQ keys
 	};
 
 	size_t GetIdentityBufferLen (const uint8_t * buf, size_t len); // return actual identity length in buffer
@@ -162,7 +171,7 @@ namespace data
 			size_t FromBuffer (const uint8_t * buf, size_t len);
 			size_t ToBuffer (uint8_t * buf, size_t len) const;
 
-			size_t FromBase64(const std::string& s);
+			size_t FromBase64(std::string_view s);
 			std::string ToBase64 () const;
 
 			std::shared_ptr<i2p::crypto::CryptoKeyDecryptor> CreateDecryptor (const uint8_t * key) const;

libi2pd/LeaseSet.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -14,6 +14,7 @@
 #include "Timestamp.h"
 #include "NetDb.hpp"
 #include "Tunnel.h"
+#include "CryptoKey.h"
 #include "LeaseSet.h"
 
 namespace i2p
@@ -399,6 +400,7 @@ namespace data
 		offset += propertiesLen; // skip for now. TODO: implement properties
 		// key sections
 		CryptoKeyType preferredKeyType = m_EncryptionType;
+		m_EncryptionType = 0;
 		bool preferredKeyFound = false;
 		if (offset + 1 > len) return 0;
 		int numKeySections = buf[offset]; offset++;
@@ -410,13 +412,21 @@ namespace data
 			if (offset + encryptionKeyLen > len) return 0;
 			if (IsStoreLeases () && !preferredKeyFound) // create encryptor with leases only
 			{
-				// we pick first valid key if preferred not found
+				// we pick max key type if preferred not found
-				auto encryptor = i2p::data::IdentityEx::CreateEncryptor (keyType, buf + offset);
+#if !OPENSSL_PQ
-				if (encryptor && (!m_Encryptor || keyType == preferredKeyType))
+				if (keyType <= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD) // skip PQ keys if not supported
+#endif			
 				{	
-					m_Encryptor = encryptor; // TODO: atomic
+					if (keyType == preferredKeyType || !m_Encryptor || keyType > m_EncryptionType)
-					m_EncryptionType = keyType;
+					{
-					if (keyType == preferredKeyType) preferredKeyFound = true;
+						auto encryptor = i2p::data::IdentityEx::CreateEncryptor (keyType, buf + offset);
+						if (encryptor)
+						{
+							m_Encryptor = encryptor; // TODO: atomic
+							m_EncryptionType = keyType;
+							if (keyType == preferredKeyType) preferredKeyFound = true;
+						}	
+					}
 				}	
 			}
 			offset += encryptionKeyLen;
@@ -838,7 +848,7 @@ namespace data
 	}
 
 	LocalLeaseSet2::LocalLeaseSet2 (uint8_t storeType, const i2p::data::PrivateKeys& keys,
-		const KeySections& encryptionKeys, const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels,
+		const EncryptionKeys& encryptionKeys, const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels,
 		bool isPublic, uint64_t publishedTimestamp, bool isPublishedEncrypted):
 		LocalLeaseSet (keys.GetPublic (), nullptr, 0)
 	{
@@ -848,7 +858,7 @@ namespace data
 		if (num > MAX_NUM_LEASES) num = MAX_NUM_LEASES;
 		size_t keySectionsLen = 0;
 		for (const auto& it: encryptionKeys)
-			keySectionsLen += 2/*key type*/ + 2/*key len*/ + it.keyLen/*key*/;
+			keySectionsLen += 2/*key type*/ + 2/*key len*/ + it->pub.size()/*key*/;
 		m_BufferLen = identity->GetFullLen () + 4/*published*/ + 2/*expires*/ + 2/*flag*/ + 2/*properties len*/ +
 			1/*num keys*/ + keySectionsLen + 1/*num leases*/ + num*LEASE2_SIZE + keys.GetSignatureLen ();
 		uint16_t flags = 0;
@@ -883,9 +893,9 @@ namespace data
 		m_Buffer[offset] = encryptionKeys.size (); offset++; // 1 key
 		for (const auto& it: encryptionKeys)
 		{
-			htobe16buf (m_Buffer + offset, it.keyType); offset += 2; // key type
+			htobe16buf (m_Buffer + offset, it->keyType); offset += 2; // key type
-			htobe16buf (m_Buffer + offset, it.keyLen); offset += 2; // key len
+			htobe16buf (m_Buffer + offset, it->pub.size()); offset += 2; // key len
-			memcpy (m_Buffer + offset, it.encryptionPublicKey, it.keyLen); offset += it.keyLen; // key
+			memcpy (m_Buffer + offset, it->pub.data(), it->pub.size()); offset += it->pub.size(); // key
 		}
 		// leases
 		uint32_t expirationTime = 0; // in seconds

libi2pd/LeaseSet.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -12,12 +12,14 @@
 #include <inttypes.h>
 #include <string.h>
 #include <vector>
+#include <list>
 #include <set>
 #include <memory>
 #include "Identity.h"
 #include "Timestamp.h"
 #include "I2PEndian.h"
 #include "Blinding.h"
+#include "CryptoKey.h"
 
 namespace i2p
 {
@@ -150,8 +152,8 @@ namespace data
 		public:
 
 			LeaseSet2 (uint8_t storeType): LeaseSet (true), m_StoreType (storeType) {}; // for update
-			LeaseSet2 (uint8_t storeType, const uint8_t * buf, size_t len, bool storeLeases = true, CryptoKeyType preferredCrypto = CRYPTO_KEY_TYPE_ELGAMAL);
+			LeaseSet2 (uint8_t storeType, const uint8_t * buf, size_t len, bool storeLeases = true, CryptoKeyType preferredCrypto = CRYPTO_KEY_TYPE_ECIES_X25519_AEAD);
-			LeaseSet2 (const uint8_t * buf, size_t len, std::shared_ptr<const BlindedPublicKey> key, const uint8_t * secret = nullptr, CryptoKeyType preferredCrypto = CRYPTO_KEY_TYPE_ELGAMAL); // store type 5, called from local netdb only
+			LeaseSet2 (const uint8_t * buf, size_t len, std::shared_ptr<const BlindedPublicKey> key, const uint8_t * secret = nullptr, CryptoKeyType preferredCrypto = CRYPTO_KEY_TYPE_ECIES_X25519_AEAD); // store type 5, called from local netdb only
 			uint8_t GetStoreType () const { return m_StoreType; };
 			uint32_t GetPublishedTimestamp () const { return m_PublishedTimestamp; };
 			bool IsPublic () const { return m_IsPublic; };
@@ -247,15 +249,10 @@ namespace data
 	{
 		public:
 
-			struct KeySection
+			typedef std::list<std::shared_ptr<const i2p::crypto::LocalEncryptionKey> > EncryptionKeys;
-			{
-				uint16_t keyType, keyLen;
-				const uint8_t * encryptionPublicKey;
-			};
-			typedef std::vector<KeySection> KeySections;
 
 			LocalLeaseSet2 (uint8_t storeType, const i2p::data::PrivateKeys& keys,
-				const KeySections& encryptionKeys,
+				const EncryptionKeys& encryptionKeys,
 				const std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> >& tunnels,
 				bool isPublic, uint64_t publishedTimestamp,
 			    bool isPublishedEncrypted = false);

libi2pd/NTCP2.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -145,10 +145,12 @@ namespace transport
 		// 2 bytes reserved
 		htobe32buf (options + 8, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000); // tsA, rounded to seconds
 		// 4 bytes reserved
-		// sign and encrypt options, use m_H as AD
+		// encrypt options
-		uint8_t nonce[12];
+		if (!Encrypt (options, m_SessionRequestBuffer + 32, 16))
-		memset (nonce, 0, 12); // set nonce to zero
+		{
-		i2p::crypto::AEADChaCha20Poly1305 (options, 16, GetH (), 32, GetK (), nonce, m_SessionRequestBuffer + 32, 32, true); // encrypt
+			LogPrint (eLogWarning, "NTCP2: SessionRequest failed to encrypt options");
+			return false;
+		}	
 		return true;
 	}
 
@@ -167,14 +169,16 @@ namespace transport
 		memset (options, 0, 16);
 		htobe16buf (options + 2, paddingLen); // padLen
 		htobe32buf (options + 8, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000); // tsB, rounded to seconds
-		// sign and encrypt options, use m_H as AD
+		// encrypt options
-		uint8_t nonce[12];
+		if (!Encrypt (options, m_SessionCreatedBuffer + 32, 16))
-		memset (nonce, 0, 12); // set nonce to zero
+		{
-		i2p::crypto::AEADChaCha20Poly1305 (options, 16, GetH (), 32, GetK (), nonce, m_SessionCreatedBuffer + 32, 32, true); // encrypt
+			LogPrint (eLogWarning, "NTCP2: SessionCreated failed to encrypt options");
+			return false;
+		}	
 		return true;
 	}
 
-	void NTCP2Establisher::CreateSessionConfirmedMessagePart1 (const uint8_t * nonce)
+	bool NTCP2Establisher::CreateSessionConfirmedMessagePart1 ()
 	{
 		// update AD
 		MixHash (m_SessionCreatedBuffer + 32, 32);	// encrypted payload
@@ -182,19 +186,28 @@ namespace transport
 		if (paddingLength > 0)
 			MixHash (m_SessionCreatedBuffer + 64, paddingLength);
 
-		// part1 48 bytes
+		// part1 48 bytes, n = 1
-		i2p::crypto::AEADChaCha20Poly1305 (i2p::context.GetNTCP2StaticPublicKey (), 32, GetH (), 32, GetK (), nonce, m_SessionConfirmedBuffer, 48, true); // encrypt
+		if (!Encrypt (i2p::context.GetNTCP2StaticPublicKey (), m_SessionConfirmedBuffer, 32))
+		{
+			LogPrint (eLogWarning, "NTCP2: SessionConfirmed failed to encrypt part1");
+			return false;
+		}	
+		return true;		
 	}
 
-	bool NTCP2Establisher::CreateSessionConfirmedMessagePart2 (const uint8_t * nonce)
+	bool NTCP2Establisher::CreateSessionConfirmedMessagePart2 ()
 	{
 		// part 2
 		// update AD again
 		MixHash (m_SessionConfirmedBuffer, 48);
 		// encrypt m3p2, it must be filled in SessionRequest
-		if (!KDF3Alice ()) return false;
+		if (!KDF3Alice ()) return false; // MixKey, n = 0
 		uint8_t * m3p2 = m_SessionConfirmedBuffer + 48;
-		i2p::crypto::AEADChaCha20Poly1305 (m3p2, m3p2Len - 16, GetH (), 32, GetK (), nonce, m3p2, m3p2Len, true); // encrypt
+		if (!Encrypt (m3p2, m3p2, m3p2Len - 16))
+		{
+			LogPrint (eLogWarning, "NTCP2: SessionConfirmed failed to encrypt part2");
+			return false;
+		}	
 		// update h again
 		MixHash (m3p2, m3p2Len); //h = SHA256(h || ciphertext)
 		return true;
@@ -214,10 +227,9 @@ namespace transport
 			LogPrint (eLogWarning, "NTCP2: SessionRequest KDF failed");
 			return false;
 		}	
-		// verify MAC and decrypt options block (32 bytes), use m_H as AD
+		// verify MAC and decrypt options block (32 bytes)
-		uint8_t nonce[12], options[16];
+		uint8_t options[16];
-		memset (nonce, 0, 12); // set nonce to zero
+		if (Decrypt (m_SessionRequestBuffer + 32, options, 16)) 
-		if (i2p::crypto::AEADChaCha20Poly1305 (m_SessionRequestBuffer + 32, 16, GetH (), 32, GetK (), nonce, options, 16, false)) // decrypt
 		{
 			// options
 			if (options[0] && options[0] != i2p::context.GetNetID ())
@@ -274,9 +286,7 @@ namespace transport
 		}	
 		// decrypt and verify MAC
 		uint8_t payload[16];
-		uint8_t nonce[12];
+		if (Decrypt (m_SessionCreatedBuffer + 32, payload, 16)) 
-		memset (nonce, 0, 12); // set nonce to zero
-		if (i2p::crypto::AEADChaCha20Poly1305 (m_SessionCreatedBuffer + 32, 16, GetH (), 32, GetK (), nonce, payload, 16, false)) // decrypt
 		{
 			// options
 			paddingLen = bufbe16toh(payload + 2);
@@ -297,7 +307,7 @@ namespace transport
 		return true;
 	}
 
-	bool NTCP2Establisher::ProcessSessionConfirmedMessagePart1 (const uint8_t * nonce)
+	bool NTCP2Establisher::ProcessSessionConfirmedMessagePart1 ()
 	{
 		// update AD
 		MixHash (m_SessionCreatedBuffer + 32, 32);	// encrypted payload
@@ -305,7 +315,8 @@ namespace transport
 		if (paddingLength > 0)
 			MixHash (m_SessionCreatedBuffer + 64, paddingLength);
 
-		if (!i2p::crypto::AEADChaCha20Poly1305 (m_SessionConfirmedBuffer, 32, GetH (), 32, GetK (), nonce, m_RemoteStaticKey, 32, false)) // decrypt S
+		// decrypt S, n = 1
+		if (!Decrypt (m_SessionConfirmedBuffer, m_RemoteStaticKey, 32))
 		{
 			LogPrint (eLogWarning, "NTCP2: SessionConfirmed Part1 AEAD verification failed ");
 			return false;
@@ -313,17 +324,17 @@ namespace transport
 		return true;
 	}
 
-	bool NTCP2Establisher::ProcessSessionConfirmedMessagePart2 (const uint8_t * nonce, uint8_t * m3p2Buf)
+	bool NTCP2Establisher::ProcessSessionConfirmedMessagePart2 (uint8_t * m3p2Buf)
 	{
 		// update AD again
 		MixHash (m_SessionConfirmedBuffer, 48);
 
-		if (!KDF3Bob ())
+		if (!KDF3Bob ()) // MixKey, n = 0
 		{
 			LogPrint (eLogWarning, "NTCP2: SessionConfirmed Part2 KDF failed");
 			return false;
 		}	
-		if (i2p::crypto::AEADChaCha20Poly1305 (m_SessionConfirmedBuffer + 48, m3p2Len - 16, GetH (), 32, GetK (), nonce, m3p2Buf, m3p2Len - 16, false)) // decrypt
+		if (Decrypt (m_SessionConfirmedBuffer + 48, m3p2Buf, m3p2Len - 16))
 			// calculate new h again for KDF data
 			MixHash (m_SessionConfirmedBuffer + 48, m3p2Len); // h = SHA256(h || ciphertext)
 		else
@@ -657,11 +668,12 @@ namespace transport
 
 	void NTCP2Session::SendSessionConfirmed ()
 	{
-		uint8_t nonce[12];
+		if (!m_Establisher->CreateSessionConfirmedMessagePart1 ()) 
-		CreateNonce (1, nonce); // set nonce to 1
+		{
-		m_Establisher->CreateSessionConfirmedMessagePart1 (nonce);
+			boost::asio::post (m_Server.GetService (), std::bind (&NTCP2Session::Terminate, shared_from_this ()));
-		memset (nonce, 0, 12); // set nonce back to 0
+			return;
-		if (!m_Establisher->CreateSessionConfirmedMessagePart2 (nonce))
+		}	
+		if (!m_Establisher->CreateSessionConfirmedMessagePart2 ())
 		{
 			LogPrint (eLogWarning, "NTCP2: Send SessionConfirmed Part2 KDF failed");
 			boost::asio::post (m_Server.GetService (), std::bind (&NTCP2Session::Terminate, shared_from_this ()));
@@ -740,14 +752,11 @@ namespace transport
 		// run on establisher thread
 		LogPrint (eLogDebug, "NTCP2: SessionConfirmed received");
 		// part 1
-		uint8_t nonce[12];
+		if (m_Establisher->ProcessSessionConfirmedMessagePart1 ())
-		CreateNonce (1, nonce);
-		if (m_Establisher->ProcessSessionConfirmedMessagePart1 (nonce))
 		{
 			// part 2
 			auto buf = std::make_shared<std::vector<uint8_t> > (m_Establisher->m3p2Len - 16); // -MAC
-			memset (nonce, 0, 12); // set nonce to 0 again
+			if (m_Establisher->ProcessSessionConfirmedMessagePart2 (buf->data ())) // TODO:handle in establisher thread
-			if (m_Establisher->ProcessSessionConfirmedMessagePart2 (nonce, buf->data ())) // TODO:handle in establisher thread
 			{
 				// payload 
 				// RI block must be first 
@@ -819,15 +828,20 @@ namespace transport
 			Terminate ();
 			return;
 		}
-		std::shared_ptr<i2p::data::RouterProfile> profile; // not null if older 
+		
+		bool isOlder = false;
 		if (ri.GetTimestamp () + i2p::data::NETDB_EXPIRATION_TIMEOUT_THRESHOLD*1000LL < ri1->GetTimestamp ())
 		{	
 			// received RouterInfo is older than one in netdb
-			profile = i2p::data::GetRouterProfile (ri1->GetIdentHash ()); // retrieve profile	
+			isOlder = true;
-			if (profile && profile->IsDuplicated ())
+			if (ri1->HasProfile ())
 			{	
-				SendTerminationAndTerminate (eNTCP2Banned);
+				auto profile = i2p::data::GetRouterProfile (ri1->GetIdentHash ()); // retrieve profile	
-				return;
+				if (profile && profile->IsDuplicated ())
+				{	
+					SendTerminationAndTerminate (eNTCP2Banned);
+					return;
+				}	
 			}	
 		}
 		
@@ -844,8 +858,12 @@ namespace transport
 		     memcmp (m_RemoteEndpoint.address ().to_v6 ().to_bytes ().data () + 1, addr->host.to_v6 ().to_bytes ().data () + 1, 7) : // from the same yggdrasil subnet
 		     memcmp (m_RemoteEndpoint.address ().to_v6 ().to_bytes ().data (), addr->host.to_v6 ().to_bytes ().data (), 8)))) // temporary address
 		{
-			if (profile) // older router?
+			if (isOlder) // older router?
-				profile->Duplicated (); // mark router as duplicated in profile
+				i2p::data::UpdateRouterProfile (ri1->GetIdentHash (),
+					[](std::shared_ptr<i2p::data::RouterProfile> profile)
+					{
+						if (profile) profile->Duplicated (); // mark router as duplicated in profile
+					});
 			else
 				LogPrint (eLogInfo, "NTCP2: Host mismatch between published address ", addr->host, " and actual endpoint ", m_RemoteEndpoint.address ());
 			SendTerminationAndTerminate (eNTCP2Banned);

libi2pd/NTCP2.h

@@ -91,7 +91,6 @@ namespace transport
 		const uint8_t * GetRemotePub () const { return m_RemoteEphemeralPublicKey; }; // Y for Alice and X for Bob
 		uint8_t * GetRemotePub () { return m_RemoteEphemeralPublicKey; }; // to set
 
-		const uint8_t * GetK () const { return m_CK + 32; };
 		const uint8_t * GetCK () const { return m_CK; };
 		const uint8_t * GetH () const { return m_H; };
 
@@ -108,13 +107,13 @@ namespace transport
 
 		bool CreateSessionRequestMessage (std::mt19937& rng);
 		bool CreateSessionCreatedMessage (std::mt19937& rng);
-		void CreateSessionConfirmedMessagePart1 (const uint8_t * nonce);
+		bool CreateSessionConfirmedMessagePart1 ();
-		bool CreateSessionConfirmedMessagePart2 (const uint8_t * nonce);
+		bool CreateSessionConfirmedMessagePart2 ();
 
 		bool ProcessSessionRequestMessage (uint16_t& paddingLen, bool& clockSkew);
 		bool ProcessSessionCreatedMessage (uint16_t& paddingLen);
-		bool ProcessSessionConfirmedMessagePart1 (const uint8_t * nonce);
+		bool ProcessSessionConfirmedMessagePart1 ();
-		bool ProcessSessionConfirmedMessagePart2 (const uint8_t * nonce, uint8_t * m3p2Buf);
+		bool ProcessSessionConfirmedMessagePart2 (uint8_t * m3p2Buf);
 
 		std::shared_ptr<i2p::crypto::X25519Keys> m_EphemeralKeys;
 		uint8_t m_RemoteEphemeralPublicKey[32]; // x25519

libi2pd/NetDb.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -10,7 +10,6 @@
 #include <fstream>
 #include <vector>
 #include <map>
-#include <random>
 #include <boost/asio.hpp>
 #include <stdexcept>
 
@@ -40,7 +39,7 @@ namespace data
 
 	NetDb::NetDb (): m_IsRunning (false), m_Thread (nullptr), m_Reseeder (nullptr), 
 		m_Storage("netDb", "r", "routerInfo-", "dat"), m_PersistProfiles (true),
-		m_LastExploratorySelectionUpdateTime (0)
+		m_LastExploratorySelectionUpdateTime (0), m_Rng(i2p::util::GetMonotonicMicroseconds () % 1000000LL)
 	{
 	}
 
@@ -119,8 +118,9 @@ namespace data
 		i2p::util::SetThreadName("NetDB");
 
 		uint64_t lastManage = 0;
-		uint64_t lastProfilesCleanup = i2p::util::GetMonotonicMilliseconds (), lastObsoleteProfilesCleanup = lastProfilesCleanup;
+		uint64_t lastProfilesCleanup = i2p::util::GetMonotonicMilliseconds (), 
-		int16_t profilesCleanupVariance = 0, obsoleteProfilesCleanVariance = 0;
+			lastObsoleteProfilesCleanup = lastProfilesCleanup, lastApplyingProfileUpdates = lastProfilesCleanup;
+		int16_t profilesCleanupVariance = 0, obsoleteProfilesCleanVariance = 0, applyingProfileUpdatesVariance = 0;
 
 		std::list<std::shared_ptr<const I2NPMessage> > msgs;
 		while (m_IsRunning)
@@ -181,7 +181,7 @@ namespace data
 							LogPrint (eLogWarning, "NetDb: Can't persist profiles. Profiles are being saved to disk");
 					}	
 					lastProfilesCleanup = mts;
-					profilesCleanupVariance = rand () % i2p::data::PEER_PROFILE_AUTOCLEAN_VARIANCE;
+					profilesCleanupVariance = m_Rng () % i2p::data::PEER_PROFILE_AUTOCLEAN_VARIANCE;
 				}
 
 				if (mts >= lastObsoleteProfilesCleanup + (uint64_t)(i2p::data::PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_TIMEOUT + obsoleteProfilesCleanVariance)*1000)
@@ -197,7 +197,20 @@ namespace data
 					else
 						LogPrint (eLogWarning, "NetDb: Can't delete profiles. Profiles are being deleted from disk");
 					lastObsoleteProfilesCleanup = mts;
-					obsoleteProfilesCleanVariance = rand () % i2p::data::PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_VARIANCE;
+					obsoleteProfilesCleanVariance = m_Rng () % i2p::data::PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_VARIANCE;
+				}	
+				if (mts >= lastApplyingProfileUpdates + i2p::data::PEER_PROFILE_APPLY_POSTPONED_TIMEOUT + applyingProfileUpdatesVariance)
+				{
+					bool isApplying = m_ApplyingProfileUpdates.valid ();
+					if (isApplying && m_ApplyingProfileUpdates.wait_for(std::chrono::seconds(0)) == std::future_status::ready) // still active?
+					{
+						m_ApplyingProfileUpdates.get ();
+						isApplying = false;
+					}	
+					if (!isApplying)
+						m_ApplyingProfileUpdates = i2p::data::FlushPostponedRouterProfileUpdates ();
+					lastApplyingProfileUpdates = mts;
+					applyingProfileUpdatesVariance = m_Rng () % i2p::data::PEER_PROFILE_APPLY_POSTPONED_TIMEOUT_VARIANCE;
 				}	
 			}
 			catch (std::exception& ex)
@@ -281,6 +294,7 @@ namespace data
 			}
 			else
 			{
+				r->CancelBufferToDelete (); // since an update received
 				if (CheckLogLevel (eLogDebug))
 					LogPrint (eLogDebug, "NetDb: RouterInfo is older: ", ident.ToBase64());
 				updated = false;
@@ -557,7 +571,7 @@ namespace data
 		while(n > 0)
 		{
 			std::lock_guard<std::mutex> lock(m_RouterInfosMutex);
-			uint32_t idx = rand () % m_RouterInfos.size ();
+			uint32_t idx = m_Rng () % m_RouterInfos.size ();
 			uint32_t i = 0;
 			for (const auto & it : m_RouterInfos) {
 				if(i >= idx) // are we at the random start point?
@@ -660,16 +674,21 @@ namespace data
 					{
 						std::lock_guard<std::mutex> l(m_RouterInfosMutex); // possible collision between DeleteBuffer and Update
 						buffer = r->CopyBuffer ();
-						r->ScheduleBufferToDelete ();
 					}
+					if (!i2p::transport::transports.IsConnected (ident))
+						r->ScheduleBufferToDelete ();
 					if (buffer)
-						saveToDisk.push_back(std::make_pair(ident.ToBase64 (), buffer));
+						saveToDisk.emplace_back(ident.ToBase64 (), buffer);
 				}
 				r->SetUpdated (false);
 				updatedCount++;
 				continue;
 			}
-			if (r->GetProfile ()->IsUnreachable ())
+			else if (r->GetBuffer () && ts > r->GetTimestamp () + NETDB_MIN_EXPIRATION_TIMEOUT*1000LL)
+				// since update was long time ago we assume that router is not connected anymore
+				r->ScheduleBufferToDelete ();
+			
+			if (r->HasProfile () && r->GetProfile ()->IsUnreachable ())
 				r->SetUnreachable (true);
 			// make router reachable back if too few routers or floodfills
 			if (r->IsUnreachable () && (total - deletedCount < NETDB_MIN_ROUTERS || isLowRate || isOffline ||
@@ -696,15 +715,16 @@ namespace data
 							r->SetUnreachable (true);
 				}	
 			}
-			// make router reachable back if connected now
+			// make router reachable back if connected now or trusted router
-			if (r->IsUnreachable () && i2p::transport::transports.IsConnected (ident))
+			if (r->IsUnreachable () && (i2p::transport::transports.IsConnected (ident) ||
+				i2p::transport::transports.IsTrustedRouter (ident)))
 				r->SetUnreachable (false);
 			
 			if (r->IsUnreachable ())
 			{
 				if (r->IsFloodfill ()) deletedFloodfillsCount++;
 				// delete RI file
-				removeFromDisk.push_back (ident.ToBase64());
+				removeFromDisk.emplace_back (ident.ToBase64());
 				deletedCount++;
 				if (total - deletedCount < NETDB_MIN_ROUTERS) checkForExpiration = false;
 			}
@@ -931,14 +951,13 @@ namespace data
 			LogPrint (eLogError, "NetDb: DatabaseLookup for zero ident. Ignored");
 			return;
 		}
-		char key[48];
+		std::string key;
-		int l = i2p::data::ByteStreamToBase64 (buf, 32, key, 48);
+		if (CheckLogLevel (eLogInfo))
-		key[l] = 0;
+			key = i2p::data::ByteStreamToBase64 (buf, 32);
 
 		IdentHash replyIdent(buf + 32);
 		uint8_t flag = buf[64];
 
-
 		LogPrint (eLogDebug, "NetDb: DatabaseLookup for ", key, " received flags=", (int)flag);
 		uint8_t lookupType = flag & DATABASE_LOOKUP_TYPE_FLAGS_MASK;
 		const uint8_t * excluded = buf + 65;
@@ -1331,7 +1350,7 @@ namespace data
 			if (eligible.size () > NETDB_MAX_EXPLORATORY_SELECTION_SIZE)
 			{
 				 std::sample (eligible.begin(), eligible.end(), std::back_inserter(m_ExploratorySelection),
-				 	NETDB_MAX_EXPLORATORY_SELECTION_SIZE, std::mt19937(ts));
+				 	NETDB_MAX_EXPLORATORY_SELECTION_SIZE, m_Rng);
 			}	
 			else
 				std::swap (m_ExploratorySelection, eligible);	

libi2pd/NetDb.hpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -16,6 +16,7 @@
 #include <thread>
 #include <mutex>
 #include <future>
+#include <random>
 
 #include "Base.h"
 #include "Gzip.h"
@@ -52,6 +53,7 @@ namespace data
 	const int NETDB_MIN_HIGHBANDWIDTH_VERSION = MAKE_VERSION_NUMBER(0, 9, 58); // 0.9.58
 	const int NETDB_MIN_FLOODFILL_VERSION = MAKE_VERSION_NUMBER(0, 9, 59); // 0.9.59
 	const int NETDB_MIN_SHORT_TUNNEL_BUILD_VERSION = MAKE_VERSION_NUMBER(0, 9, 51); // 0.9.51
+	const int NETDB_MIN_PEER_TEST_VERSION = MAKE_VERSION_NUMBER(0, 9, 62); // 0.9.62
 	const size_t NETDB_MAX_NUM_SEARCH_REPLY_PEER_HASHES = 16;
 	const size_t NETDB_MAX_EXPLORATORY_SELECTION_SIZE = 500;
 	const int NETDB_EXPLORATORY_SELECTION_UPDATE_INTERVAL = 82; // in seconds. for floodfill
@@ -185,10 +187,11 @@ namespace data
 			std::shared_ptr<NetDbRequests> m_Requests;
 
 			bool m_PersistProfiles;
-			std::future<void> m_SavingProfiles, m_DeletingProfiles, m_PersistingRouters;
+			std::future<void> m_SavingProfiles, m_DeletingProfiles, m_ApplyingProfileUpdates, m_PersistingRouters;
 
 			std::vector<std::shared_ptr<const RouterInfo> > m_ExploratorySelection;
 			uint64_t m_LastExploratorySelectionUpdateTime; // in monotonic seconds
+			std::mt19937 m_Rng;
 
 			i2p::util::MemoryPoolMt<RouterInfo::Buffer> m_RouterInfoBuffersPool;
 			i2p::util::MemoryPoolMt<RouterInfo::Address> m_RouterInfoAddressesPool;

libi2pd/NetDbRequests.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -20,8 +20,10 @@ namespace i2p
 namespace data
 {
 	RequestedDestination::RequestedDestination (const IdentHash& destination, bool isExploratory, bool direct):
-		m_Destination (destination), m_IsExploratory (isExploratory), m_IsDirect (direct), m_IsActive (true),
+		m_Destination (destination), m_IsExploratory (isExploratory), m_IsDirect (direct), 
-		m_CreationTime (i2p::util::GetMillisecondsSinceEpoch ()), m_LastRequestTime (0), m_NumAttempts (0)
+		m_IsActive (true), m_IsSentDirectly (false),
+		m_CreationTime (i2p::util::GetMillisecondsSinceEpoch ()), 
+		m_LastRequestTime (0), m_NumAttempts (0)
 	{
 		if (i2p::context.IsFloodfill ())
 			m_ExcludedPeers.insert (i2p::context.GetIdentHash ()); // exclude self if floodfill
@@ -46,6 +48,7 @@ namespace data
 			m_ExcludedPeers.insert (router->GetIdentHash ());
 		m_LastRequestTime = i2p::util::GetMillisecondsSinceEpoch ();
 		m_NumAttempts++;
+		m_IsSentDirectly = false;
 		return msg;
 	}
 
@@ -56,6 +59,7 @@ namespace data
 		m_ExcludedPeers.insert (floodfill);
 		m_NumAttempts++;
 		m_LastRequestTime = i2p::util::GetMillisecondsSinceEpoch ();
+		m_IsSentDirectly = true;
 		return msg;
 	}
 
@@ -222,7 +226,8 @@ namespace data
 					bool done = false;
 					if (ts < dest->GetCreationTime () + MAX_REQUEST_TIME)
 					{
-						if (ts > dest->GetLastRequestTime () + MIN_REQUEST_TIME) // try next floodfill if no response after min interval
+						if (ts > dest->GetLastRequestTime () + (dest->IsSentDirectly () ? MIN_DIRECT_REQUEST_TIME : MIN_REQUEST_TIME)) 
+						// try next floodfill if no response after min interval
 							done = !SendNextRequest (dest);
 					}
 					else // request is expired
@@ -355,11 +360,12 @@ namespace data
 	void NetDbRequests::HandleDatabaseSearchReplyMsg (std::shared_ptr<const I2NPMessage> msg)
 	{
 		const uint8_t * buf = msg->GetPayload ();
-		char key[48];
+		std::string key;
-		int l = i2p::data::ByteStreamToBase64 (buf, 32, key, 48);
-		key[l] = 0;
 		size_t num = buf[32]; // num
+		if (CheckLogLevel (eLogInfo))
+			key = i2p::data::ByteStreamToBase64 (buf, 32);
 		LogPrint (eLogDebug, "NetDbReq: DatabaseSearchReply for ", key, " num=", num);
+
 		IdentHash ident (buf);
 		bool isExploratory = false;
 		auto dest = FindRequest (ident);

libi2pd/NetDbRequests.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -28,6 +28,7 @@ namespace data
 	const uint64_t MANAGE_REQUESTS_INTERVAL_VARIANCE = 300; // in milliseconds
 	const uint64_t MIN_REQUEST_TIME = 1200; // in milliseconds
 	const uint64_t MAX_REQUEST_TIME = MAX_NUM_REQUEST_ATTEMPTS * (MIN_REQUEST_TIME + MANAGE_REQUESTS_INTERVAL + MANAGE_REQUESTS_INTERVAL_VARIANCE);
+	const uint64_t MIN_DIRECT_REQUEST_TIME = 600; // in milliseconds
 	const uint64_t EXPLORATORY_REQUEST_INTERVAL = 55; // in seconds
 	const uint64_t EXPLORATORY_REQUEST_INTERVAL_VARIANCE = 170; // in seconds 
 	const uint64_t DISCOVERED_REQUEST_INTERVAL = 360; // in milliseconds
@@ -52,6 +53,7 @@ namespace data
 			bool IsExploratory () const { return m_IsExploratory; };
 			bool IsDirect () const { return m_IsDirect; };
 			bool IsActive () const { return m_IsActive; };
+			bool IsSentDirectly () const { return m_IsSentDirectly; };
 			bool IsExcluded (const IdentHash& ident) const;
 			uint64_t GetCreationTime () const { return m_CreationTime; };
 			uint64_t GetLastRequestTime () const { return m_LastRequestTime; };
@@ -70,7 +72,7 @@ namespace data
 		private:
 
 			IdentHash m_Destination;
-			bool m_IsExploratory, m_IsDirect, m_IsActive;
+			bool m_IsExploratory, m_IsDirect, m_IsActive, m_IsSentDirectly;
 			std::unordered_set<IdentHash> m_ExcludedPeers;
 			uint64_t m_CreationTime, m_LastRequestTime; // in milliseconds
 			std::list<RequestComplete> m_RequestComplete;

libi2pd/PostQuantum.cpp

@@ -0,0 +1,160 @@
+/*
+* Copyright (c) 2025, The PurpleI2P Project
+*
+* This file is part of Purple i2pd project and licensed under BSD3
+*
+* See full license text in LICENSE file at top of project tree
+*/
+
+#include "Log.h"
+#include "PostQuantum.h"
+
+#if OPENSSL_PQ
+
+#include <openssl/param_build.h>
+#include <openssl/core_names.h>
+
+namespace i2p
+{
+namespace crypto
+{
+	MLKEMKeys::MLKEMKeys (MLKEMTypes type):
+		m_Name (std::get<0>(MLKEMS[type])), m_KeyLen (std::get<1>(MLKEMS[type])), 
+		m_CTLen (std::get<2>(MLKEMS[type])), m_Pkey (nullptr)
+	{
+	}
+	
+	MLKEMKeys::~MLKEMKeys ()
+	{
+		if (m_Pkey) EVP_PKEY_free (m_Pkey);
+	}	
+
+	void MLKEMKeys::GenerateKeys ()
+	{
+		if (m_Pkey) EVP_PKEY_free (m_Pkey);
+		m_Pkey = EVP_PKEY_Q_keygen(NULL, NULL, m_Name.c_str ());
+	}
+
+	void MLKEMKeys::GetPublicKey (uint8_t * pub) const
+	{	
+		if (m_Pkey)
+		{	
+			size_t len = m_KeyLen;
+		    EVP_PKEY_get_octet_string_param (m_Pkey, OSSL_PKEY_PARAM_PUB_KEY, pub, m_KeyLen, &len);
+		}	
+	}
+
+	void MLKEMKeys::SetPublicKey (const uint8_t * pub)
+	{
+		if (m_Pkey)
+		{	
+			EVP_PKEY_free (m_Pkey);
+			m_Pkey = nullptr;
+		}	
+		OSSL_PARAM params[] =
+		{
+			OSSL_PARAM_octet_string (OSSL_PKEY_PARAM_PUB_KEY, (uint8_t *)pub, m_KeyLen),
+			OSSL_PARAM_END
+		};		
+		EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new_from_name (NULL, m_Name.c_str (), NULL);
+		if (ctx)
+		{
+			EVP_PKEY_fromdata_init (ctx);
+			EVP_PKEY_fromdata (ctx, &m_Pkey, OSSL_KEYMGMT_SELECT_PUBLIC_KEY, params);
+			EVP_PKEY_CTX_free (ctx);
+		}
+		else
+			LogPrint (eLogError, "MLKEM can't create PKEY context");
+	}
+
+	void MLKEMKeys::Encaps (uint8_t * ciphertext, uint8_t * shared)
+	{
+		if (!m_Pkey) return;
+		auto ctx = EVP_PKEY_CTX_new_from_pkey (NULL, m_Pkey, NULL);
+		if (ctx)
+		{	
+			EVP_PKEY_encapsulate_init (ctx, NULL);
+			size_t len = m_CTLen, sharedLen = 32;
+			EVP_PKEY_encapsulate (ctx, ciphertext, &len, shared, &sharedLen);
+			EVP_PKEY_CTX_free (ctx);
+		}
+		else
+			LogPrint (eLogError, "MLKEM can't create PKEY context");
+	}	
+
+	void MLKEMKeys::Decaps (const uint8_t * ciphertext, uint8_t * shared)
+	{
+		if (!m_Pkey) return;
+		auto ctx = EVP_PKEY_CTX_new_from_pkey (NULL, m_Pkey, NULL);
+		if (ctx)
+		{	
+			EVP_PKEY_decapsulate_init (ctx, NULL);
+			size_t sharedLen = 32;
+			EVP_PKEY_decapsulate (ctx, shared, &sharedLen, ciphertext, m_CTLen);
+			EVP_PKEY_CTX_free (ctx);
+		}
+		else
+			LogPrint (eLogError, "MLKEM can't create PKEY context");
+	}	
+
+	std::unique_ptr<MLKEMKeys> CreateMLKEMKeys (i2p::data::CryptoKeyType type)
+	{
+		if (type <= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ||
+		    type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD > (int)MLKEMS.size ()) return nullptr;
+		return std::make_unique<MLKEMKeys>((MLKEMTypes)(type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD - 1));
+	}	
+
+	static constexpr std::array<std::pair<std::array<uint8_t, 32>, std::array<uint8_t, 32> >, 3> NoiseIKInitMLKEMKeys =
+	{
+		std::make_pair
+		(
+			std::array<uint8_t, 32>
+		 	{
+				0xb0, 0x8f, 0xb1, 0x73, 0x92, 0x66, 0xc9, 0x90, 0x45, 0x7f, 0xdd, 0xc6, 0x4e, 0x55, 0x40, 0xd8, 
+				0x0a, 0x37, 0x99, 0x06, 0x92, 0x2a, 0x78, 0xc4, 0xb1, 0xef, 0x86, 0x06, 0xd0, 0x15, 0x9f, 0x4d
+			}, // SHA256("Noise_IKhfselg2_25519+MLKEM512_ChaChaPoly_SHA256")
+			std::array<uint8_t, 32>
+		 	{
+				0x95, 0x8d, 0xf6, 0x6c, 0x95, 0xce, 0xa9, 0xf7, 0x42, 0xfc, 0xfa, 0x62, 0x71, 0x36, 0x1e, 0xa7,
+				0xdc, 0x7a, 0xc0, 0x75, 0x01, 0xcf, 0xf9, 0xfc, 0x9f, 0xdb, 0x4c, 0x68, 0x3a, 0x53, 0x49, 0xeb
+			} // SHA256 (first)
+		),
+		std::make_pair
+		(
+			std::array<uint8_t, 32>
+		 	{
+				0x36, 0x03, 0x90, 0x2d, 0xf9, 0xa2, 0x2a, 0x5e, 0xc9, 0x3d, 0xdb, 0x8f, 0xa8, 0x1b, 0xdb, 0x4b,
+				0xae, 0x9d, 0x93, 0x9c, 0xdf, 0xaf, 0xde, 0x55, 0x49, 0x13, 0xfe, 0x98, 0xf8, 0x4a, 0xd4, 0xbd
+			}, // SHA256("Noise_IKhfselg2_25519+MLKEM768_ChaChaPoly_SHA256")
+		 	std::array<uint8_t, 32>
+		 	{
+				0x15, 0x44, 0x89, 0xbf, 0x30, 0xf0, 0xc9, 0x77, 0x66, 0x10, 0xcb, 0xb1, 0x57, 0x3f, 0xab, 0x68,
+				0x79, 0x57, 0x39, 0x57, 0x0a, 0xe7, 0xc0, 0x31, 0x8a, 0xa2, 0x96, 0xef, 0xbf, 0xa9, 0x6a, 0xbb
+			} // SHA256 (first)
+		),
+		std::make_pair
+		(
+			std::array<uint8_t, 32>
+		 	{
+				0x86, 0xa5, 0x36, 0x44, 0xc6, 0x12, 0xd5, 0x71, 0xa1, 0x2d, 0xd8, 0xb6, 0x0a, 0x00, 0x9f, 0x2c,
+				0x1a, 0xa8, 0x7d, 0x22, 0xa4, 0xff, 0x2b, 0xcd, 0x61, 0x34, 0x97, 0x6d, 0xa1, 0x49, 0xeb, 0x4a
+			}, // SHA256("Noise_IKhfselg2_25519+MLKEM1024_ChaChaPoly_SHA256")
+		 	std::array<uint8_t, 32>
+		 	{
+				0x42, 0x0d, 0xc2, 0x1c, 0x7b, 0x18, 0x61, 0xb7, 0x4a, 0x04, 0x3d, 0xae, 0x0f, 0xdc, 0xf2, 0x71,
+				0xb9, 0xba, 0x19, 0xbb, 0xbd, 0x5f, 0xd4, 0x9c, 0x3f, 0x4b, 0x01, 0xed, 0x6d, 0x13, 0x1d, 0xa2
+			} // SHA256 (first)
+		)
+	};
+		
+	void InitNoiseIKStateMLKEM (NoiseSymmetricState& state, i2p::data::CryptoKeyType type, const uint8_t * pub)
+	{
+		if (type <= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ||
+		    type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD > (int)NoiseIKInitMLKEMKeys.size ()) return;
+		auto ind = type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD - 1;
+		state.Init (NoiseIKInitMLKEMKeys[ind].first.data(), NoiseIKInitMLKEMKeys[ind].second.data(), pub);
+	}		
+}	
+}	
+
+#endif

libi2pd/PostQuantum.h

@@ -0,0 +1,88 @@
+/*
+* Copyright (c) 2025, The PurpleI2P Project
+*
+* This file is part of Purple i2pd project and licensed under BSD3
+*
+* See full license text in LICENSE file at top of project tree
+*/
+
+#ifndef POST_QUANTUM_H__
+#define POST_QUANTUM_H__
+
+#include <memory>
+#include <string_view>
+#include <array>
+#include <tuple>
+#include "Crypto.h"
+#include "Identity.h"
+
+#if OPENSSL_PQ
+
+namespace i2p
+{
+namespace crypto
+{
+	enum MLKEMTypes
+	{
+		eMLKEM512 = 0,
+		eMLKEM768,
+		eMLKEM1024
+	};	
+	
+	constexpr size_t MLKEM512_KEY_LENGTH = 800;
+	constexpr size_t MLKEM512_CIPHER_TEXT_LENGTH = 768;
+	constexpr size_t MLKEM768_KEY_LENGTH = 1184;
+	constexpr size_t MLKEM768_CIPHER_TEXT_LENGTH = 1088;
+	constexpr size_t MLKEM1024_KEY_LENGTH = 1568;
+	constexpr size_t MLKEM1024_CIPHER_TEXT_LENGTH = 1568;
+
+	constexpr std::array<std::tuple<std::string_view, size_t, size_t>, 3> MLKEMS =
+	{
+		std::make_tuple ("ML-KEM-512", MLKEM512_KEY_LENGTH, MLKEM512_CIPHER_TEXT_LENGTH),
+		std::make_tuple ("ML-KEM-768", MLKEM768_KEY_LENGTH, MLKEM768_CIPHER_TEXT_LENGTH),
+		std::make_tuple ("ML-KEM-1024", MLKEM1024_KEY_LENGTH, MLKEM1024_CIPHER_TEXT_LENGTH)
+	};	
+
+	constexpr size_t GetMLKEMPublicKeyLen (i2p::data::CryptoKeyType type)
+	{
+		if (type <= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ||
+		    type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD > (int)MLKEMS.size ()) return 0;
+		return std::get<1>(MLKEMS[type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD - 1]);
+	}	
+
+	constexpr size_t GetMLKEMCipherTextLen (i2p::data::CryptoKeyType type)
+	{
+		if (type <= i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD ||
+		    type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD > (int)MLKEMS.size ()) return 0;
+		return std::get<2>(MLKEMS[type - i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD - 1]);
+	}
+	
+	class MLKEMKeys
+	{
+		public:
+
+			MLKEMKeys (MLKEMTypes type);
+			~MLKEMKeys ();
+
+			void GenerateKeys ();
+			void GetPublicKey (uint8_t * pub) const;
+			void SetPublicKey (const uint8_t * pub);
+			void Encaps (uint8_t * ciphertext, uint8_t * shared);
+			void Decaps (const uint8_t * ciphertext, uint8_t * shared);
+			
+		private:
+
+			const std::string m_Name;
+			const size_t m_KeyLen, m_CTLen;
+			EVP_PKEY * m_Pkey;		
+	};
+
+	std::unique_ptr<MLKEMKeys> CreateMLKEMKeys (i2p::data::CryptoKeyType type);
+
+	void InitNoiseIKStateMLKEM (NoiseSymmetricState& state, i2p::data::CryptoKeyType type, const uint8_t * pub); // Noise_IK (ratchets) PQ ML-KEM5
+}	
+}	
+
+#endif
+
+#endif

libi2pd/Profiling.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -27,13 +27,15 @@ namespace data
 	static i2p::fs::HashedStorage g_ProfilesStorage("peerProfiles", "p", "profile-", "txt");
 	static std::unordered_map<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > g_Profiles;
 	static std::mutex g_ProfilesMutex;
+	static std::list<std::pair<i2p::data::IdentHash, std::function<void (std::shared_ptr<RouterProfile>)> > > g_PostponedUpdates;
+	static std::mutex g_PostponedUpdatesMutex;
 	
 	RouterProfile::RouterProfile ():
 		m_IsUpdated (false), m_LastDeclineTime (0), m_LastUnreachableTime (0),
-		m_LastUpdateTime (i2p::util::GetSecondsSinceEpoch ()), 
+		m_LastUpdateTime (i2p::util::GetSecondsSinceEpoch ()), m_LastAccessTime (0),
-		m_NumTunnelsAgreed (0), m_NumTunnelsDeclined (0), m_NumTunnelsNonReplied (0),
+		m_LastPersistTime (0), m_NumTunnelsAgreed (0), m_NumTunnelsDeclined (0),
-		m_NumTimesTaken (0), m_NumTimesRejected (0), m_HasConnected (false),
+		m_NumTunnelsNonReplied (0),m_NumTimesTaken (0), m_NumTimesRejected (0),
-		m_IsDuplicated (false)
+		m_HasConnected (false), m_IsDuplicated (false)
 	{
 	}
 
@@ -78,6 +80,7 @@ namespace data
 
 	void RouterProfile::Load (const IdentHash& identHash)
 	{
+		m_IsUpdated = false;
 		std::string ident = identHash.ToBase64 ();
 		std::string path = g_ProfilesStorage.Path(ident);
 		boost::property_tree::ptree pt;
@@ -255,24 +258,36 @@ namespace data
 			std::unique_lock<std::mutex> l(g_ProfilesMutex);
 			auto it = g_Profiles.find (identHash);
 			if (it != g_Profiles.end ())
+			{
+				it->second->SetLastAccessTime (i2p::util::GetSecondsSinceEpoch ());
 				return it->second;
+			}	
 		}
 		auto profile = netdb.NewRouterProfile ();
 		profile->Load (identHash); // if possible
-		std::unique_lock<std::mutex> l(g_ProfilesMutex);
+		std::lock_guard<std::mutex> l(g_ProfilesMutex);
 		g_Profiles.emplace (identHash, profile);
 		return profile;
 	}
 
 	bool IsRouterBanned (const IdentHash& identHash)
 	{
-		std::unique_lock<std::mutex> l(g_ProfilesMutex);
+		std::lock_guard<std::mutex> l(g_ProfilesMutex);
 		auto it = g_Profiles.find (identHash);
 		if (it != g_Profiles.end ())
 			return it->second->IsUnreachable ();
 		return false;
 	}	
 
+	bool IsRouterDuplicated (const IdentHash& identHash)
+	{
+		std::lock_guard<std::mutex> l(g_ProfilesMutex);
+		auto it = g_Profiles.find (identHash);
+		if (it != g_Profiles.end ())
+			return it->second->IsDuplicated ();
+		return false;
+	}	
+		
 	void InitProfilesStorage ()
 	{
 		g_ProfilesStorage.SetPlace(i2p::fs::GetDataDir());
@@ -290,15 +305,17 @@ namespace data
 		auto ts = i2p::util::GetSecondsSinceEpoch ();
 		std::list<std::pair<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > > tmp;
 		{
-			std::unique_lock<std::mutex> l(g_ProfilesMutex);
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
 			for (auto it = g_Profiles.begin (); it != g_Profiles.end ();)
 			{
-				if (ts - it->second->GetLastUpdateTime () > PEER_PROFILE_PERSIST_INTERVAL)
+				if (it->second->IsUpdated () && ts > it->second->GetLastPersistTime () + PEER_PROFILE_PERSIST_INTERVAL)
 				{
-					if (it->second->IsUpdated ())
+					tmp.push_back (*it);
-						tmp.push_back (std::make_pair (it->first, it->second));
+					it->second->SetLastPersistTime (ts);
-					it = g_Profiles.erase (it);
+					it->second->SetUpdated (false);
 				}	
+				if (!it->second->IsUpdated () && ts > std::max (it->second->GetLastUpdateTime (), it->second->GetLastAccessTime ()) + PEER_PROFILE_PERSIST_INTERVAL)
+					it = g_Profiles.erase (it);
 				else
 					it++;
 			}
@@ -312,7 +329,7 @@ namespace data
 	{
 		std::unordered_map<i2p::data::IdentHash, std::shared_ptr<RouterProfile> > tmp;
 		{
-			std::unique_lock<std::mutex> l(g_ProfilesMutex);
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
 			std::swap (tmp, g_Profiles);
 		}
 		auto ts = i2p::util::GetSecondsSinceEpoch ();
@@ -347,7 +364,7 @@ namespace data
 	{
 		{
 			auto ts = i2p::util::GetSecondsSinceEpoch ();
-			std::unique_lock<std::mutex> l(g_ProfilesMutex);
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
 			for (auto it = g_Profiles.begin (); it != g_Profiles.end ();)
 			{
 				if (ts - it->second->GetLastUpdateTime () >= PEER_PROFILE_EXPIRATION_TIMEOUT)
@@ -359,5 +376,47 @@ namespace data
 
 		return std::async (std::launch::async, DeleteFilesFromDisk);
 	}
+
+	bool UpdateRouterProfile (const IdentHash& identHash, std::function<void (std::shared_ptr<RouterProfile>)> update)
+	{
+		if (!update) return true;
+		std::shared_ptr<RouterProfile> profile;
+		{
+			std::lock_guard<std::mutex> l(g_ProfilesMutex);
+			auto it = g_Profiles.find (identHash);
+			if (it != g_Profiles.end ())
+				profile = it->second;
+		}
+		if (profile)
+		{
+			update (profile);
+			return true;
+		}	
+		// postpone
+		std::lock_guard<std::mutex> l(g_PostponedUpdatesMutex);
+		g_PostponedUpdates.emplace_back (identHash, update);
+		return false;
+	}	
+
+	static void ApplyPostponedUpdates (std::list<std::pair<i2p::data::IdentHash, std::function<void (std::shared_ptr<RouterProfile>)> > >&& updates)
+	{
+		for (const auto& [ident, update] : updates)
+		{
+			auto profile = GetRouterProfile (ident);
+			update (profile);
+		}	
+	}	
+		
+	std::future<void> FlushPostponedRouterProfileUpdates ()
+	{
+		if (g_PostponedUpdates.empty ()) return std::future<void>();
+
+		std::list<std::pair<i2p::data::IdentHash, std::function<void (std::shared_ptr<RouterProfile>)> > > updates;
+		{
+			std::lock_guard<std::mutex> l(g_PostponedUpdatesMutex);
+			g_PostponedUpdates.swap (updates);
+		}		
+		return std::async (std::launch::async, ApplyPostponedUpdates, std::move (updates));	
+	}	
 }
 }

libi2pd/Profiling.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,6 +11,7 @@
 
 #include <memory>
 #include <future>
+#include <functional>
 #include <boost/asio.hpp>
 #include "Identity.h"
 
@@ -40,10 +41,12 @@ namespace data
 	const int PEER_PROFILE_OBSOLETE_PROFILES_CLEAN_VARIANCE = 2400; // in seconds (40 minutes)
 	const int PEER_PROFILE_DECLINED_RECENTLY_INTERVAL = 330; // in seconds (5.5 minutes)
 	const int PEER_PROFILE_MAX_DECLINED_INTERVAL = 4400; // in second (1.5 hours)
-	const int PEER_PROFILE_PERSIST_INTERVAL = 3300; // in seconds (55 minutes)
+	const int PEER_PROFILE_PERSIST_INTERVAL = 1320; // in seconds (22 minutes)
 	const int PEER_PROFILE_UNREACHABLE_INTERVAL = 480; // in seconds (8 minutes)
 	const int PEER_PROFILE_USEFUL_THRESHOLD = 3;
 	const int PEER_PROFILE_ALWAYS_DECLINING_NUM = 5; // num declines in row to consider always declined
+	const int PEER_PROFILE_APPLY_POSTPONED_TIMEOUT = 2100; // in milliseconds	
+	const int PEER_PROFILE_APPLY_POSTPONED_TIMEOUT_VARIANCE = 500; // in milliseconds	
 	
 	class RouterProfile
 	{
@@ -67,6 +70,11 @@ namespace data
 
 			uint64_t GetLastUpdateTime () const { return m_LastUpdateTime; };
 			bool IsUpdated () const { return m_IsUpdated; };
+			void SetUpdated (bool updated) { m_IsUpdated = updated; }
+			uint64_t GetLastAccessTime () const { return m_LastAccessTime; };
+			void SetLastAccessTime (uint64_t ts) { m_LastAccessTime = ts; };
+			uint64_t GetLastPersistTime () const { return m_LastPersistTime; };
+			void SetLastPersistTime (uint64_t ts) { m_LastPersistTime = ts; };
 			
 			bool IsUseful() const;
 			bool IsDuplicated () const { return m_IsDuplicated; };
@@ -88,7 +96,8 @@ namespace data
 		private:
 
 			bool m_IsUpdated;
-			uint64_t m_LastDeclineTime, m_LastUnreachableTime, m_LastUpdateTime; // in seconds
+			uint64_t m_LastDeclineTime, m_LastUnreachableTime, m_LastUpdateTime, 
+				m_LastAccessTime, m_LastPersistTime; // in seconds
 			// participation
 			uint32_t m_NumTunnelsAgreed;
 			uint32_t m_NumTunnelsDeclined;
@@ -104,10 +113,13 @@ namespace data
 
 	std::shared_ptr<RouterProfile> GetRouterProfile (const IdentHash& identHash);
 	bool IsRouterBanned (const IdentHash& identHash); // check only existing profiles
+	bool IsRouterDuplicated (const IdentHash& identHash); // check only existing profiles
 	void InitProfilesStorage ();
 	std::future<void> DeleteObsoleteProfiles ();
 	void SaveProfiles ();
 	std::future<void> PersistProfiles ();
+	bool UpdateRouterProfile (const IdentHash& identHash, std::function<void (std::shared_ptr<RouterProfile>)> update); // return true if updated immediately, and false if postponed
+	std::future<void> FlushPostponedRouterProfileUpdates ();
 }
 }
 

libi2pd/RouterContext.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -22,6 +22,7 @@
 #include "ECIESX25519AEADRatchetSession.h"
 #include "Transports.h"
 #include "Tunnel.h"
+#include "CryptoKey.h"
 #include "RouterContext.h"
 
 namespace i2p
@@ -33,13 +34,14 @@ namespace i2p
 		m_ShareRatio (100), m_Status (eRouterStatusUnknown), m_StatusV6 (eRouterStatusUnknown),
 		m_Error (eRouterErrorNone), m_ErrorV6 (eRouterErrorNone),
 		m_Testing (false), m_TestingV6 (false), m_NetID (I2PD_NET_ID),
-		m_PublishReplyToken (0), m_IsHiddenMode (false)
+		m_PublishReplyToken (0), m_IsHiddenMode (false), 
+		m_Rng(i2p::util::GetMonotonicMicroseconds () % 1000000LL), m_IsSaving (false)
 	{
 	}
 
 	void RouterContext::Init ()
 	{
-		srand (i2p::util::GetMillisecondsSinceEpoch () % 1000);
+		srand (m_Rng () % 1000);
 		m_StartupTime = i2p::util::GetMonotonicSeconds ();
 
 		if (!Load ())
@@ -253,11 +255,36 @@ namespace i2p
 
 	void RouterContext::UpdateRouterInfo ()
 	{
+		std::shared_ptr<i2p::data::RouterInfo::Buffer> buffer;
 		{
 			std::lock_guard<std::mutex> l(m_RouterInfoMutex);
 			m_RouterInfo.CreateBuffer (m_Keys);
+			buffer = m_RouterInfo.CopyBuffer ();
+		}
+		{
+			// update save buffer to latest
+			std::lock_guard<std::mutex> l(m_SaveBufferMutex);
+			m_SaveBuffer = buffer;
+		}
+		bool isSaving = false;
+		if (m_IsSaving.compare_exchange_strong (isSaving, true)) // try to save only if not being saved
+		{	
+			auto savingRouterInfo = std::async (std::launch::async, [this]() 
+				{
+					std::shared_ptr<i2p::data::RouterInfo::Buffer> buffer;
+					while (m_SaveBuffer)
+					{
+						{
+							std::lock_guard<std::mutex> l(m_SaveBufferMutex);
+							buffer = m_SaveBuffer;
+							m_SaveBuffer = nullptr;
+						}
+						if (buffer)
+							i2p::data::RouterInfo::SaveToFile (i2p::fs::DataDirPath (ROUTER_INFO), buffer);
+					}	
+					m_IsSaving = false;
+				});
 		}	
-		m_RouterInfo.SaveToFile (i2p::fs::DataDirPath (ROUTER_INFO));
 		m_LastUpdateTime = i2p::util::GetSecondsSinceEpoch ();
 	}
 
@@ -649,12 +676,12 @@ namespace i2p
 
 	void RouterContext::SetBandwidth (int limit)
 	{
-		if      (limit > 2000) { SetBandwidth('X'); }
+		if      (limit > (int)i2p::data::EXTRA_BANDWIDTH_LIMIT) { SetBandwidth('X'); }
-		else if (limit >  256) { SetBandwidth('P'); }
+		else if (limit > (int)i2p::data::HIGH_BANDWIDTH_LIMIT) { SetBandwidth('P'); }
-		else if (limit >  128) { SetBandwidth('O'); }
+		else if (limit > 128) { SetBandwidth('O'); }
-		else if (limit >   64) { SetBandwidth('N'); }
+		else if (limit > 64) { SetBandwidth('N'); }
-		else if (limit >   48) { SetBandwidth('M'); }
+		else if (limit > (int)i2p::data::LOW_BANDWIDTH_LIMIT) { SetBandwidth('M'); }
-		else if (limit >   12) { SetBandwidth('L'); }
+		else if (limit > 12) { SetBandwidth('L'); }
 		else                   { SetBandwidth('K'); }
 		m_BandwidthLimit = limit; // set precise limit
 	}
@@ -1167,7 +1194,8 @@ namespace i2p
 		i2p::HandleI2NPMessage (CreateI2NPMessage (buf, GetI2NPMessageLength (buf, len)));
 	}
 
-	bool RouterContext::HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, size_t len, uint32_t msgID)
+	bool RouterContext::HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, 
+		size_t len, uint32_t msgID, i2p::garlic::ECIESX25519AEADRatchetSession * from)
 	{
 		if (typeID == eI2NPTunnelTest)
 		{
@@ -1359,7 +1387,7 @@ namespace i2p
 		{	
 			m_PublishTimer->cancel ();
 			m_PublishTimer->expires_from_now (boost::posix_time::seconds(ROUTER_INFO_PUBLISH_INTERVAL + 
-				rand () % ROUTER_INFO_PUBLISH_INTERVAL_VARIANCE));
+				m_Rng () % ROUTER_INFO_PUBLISH_INTERVAL_VARIANCE));
 			m_PublishTimer->async_wait (std::bind (&RouterContext::HandlePublishTimer,
 				this, std::placeholders::_1));
 		}	
@@ -1434,7 +1462,7 @@ namespace i2p
 						i2p::garlic::WrapECIESX25519MessageForRouter (msg, floodfill->GetIdentity ()->GetEncryptionPublicKey ()));
 				}	
 				else
-					LogPrint (eLogInfo, "Router: Can't publish our RouterInfo. No tunnles. Try again in ", ROUTER_INFO_CONFIRMATION_TIMEOUT, " seconds");
+					LogPrint (eLogInfo, "Router: Can't publish our RouterInfo. No tunnels. Try again in ", ROUTER_INFO_CONFIRMATION_TIMEOUT, " milliseconds");
 			}
 			m_PublishExcluded.insert (floodfill->GetIdentHash ());
 			m_PublishReplyToken = replyToken;
@@ -1448,7 +1476,7 @@ namespace i2p
 		if (m_PublishTimer)
 		{
 			m_PublishTimer->cancel ();
-			m_PublishTimer->expires_from_now (boost::posix_time::seconds(ROUTER_INFO_CONFIRMATION_TIMEOUT));
+			m_PublishTimer->expires_from_now (boost::posix_time::milliseconds(ROUTER_INFO_CONFIRMATION_TIMEOUT));
 			m_PublishTimer->async_wait (std::bind (&RouterContext::HandlePublishResendTimer,
 				this, std::placeholders::_1));
 		}	
@@ -1471,7 +1499,8 @@ namespace i2p
 		if (m_CongestionUpdateTimer)
 		{	
 			m_CongestionUpdateTimer->cancel ();
-			m_CongestionUpdateTimer->expires_from_now (boost::posix_time::seconds(ROUTER_INFO_CONGESTION_UPDATE_INTERVAL));
+			m_CongestionUpdateTimer->expires_from_now (boost::posix_time::seconds(
+				ROUTER_INFO_CONGESTION_UPDATE_INTERVAL + m_Rng () % ROUTER_INFO_CONGESTION_UPDATE_INTERVAL_VARIANCE));
 			m_CongestionUpdateTimer->async_wait (std::bind (&RouterContext::HandleCongestionUpdateTimer,
 				this, std::placeholders::_1));
 		}	

libi2pd/RouterContext.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -12,6 +12,7 @@
 #include <inttypes.h>
 #include <string>
 #include <memory>
+#include <random>
 #include <unordered_set>
 #include <boost/asio.hpp>
 #include "Identity.h"
@@ -34,9 +35,10 @@ namespace garlic
 	const int ROUTER_INFO_PUBLISH_INTERVAL = 39*60; // in seconds
 	const int ROUTER_INFO_INITIAL_PUBLISH_INTERVAL = 10; // in seconds
 	const int ROUTER_INFO_PUBLISH_INTERVAL_VARIANCE = 105;// in seconds
-	const int ROUTER_INFO_CONFIRMATION_TIMEOUT = 5; // in seconds
+	const int ROUTER_INFO_CONFIRMATION_TIMEOUT = 1600; // in milliseconds
 	const int ROUTER_INFO_MAX_PUBLISH_EXCLUDED_FLOODFILLS = 15;
-	const int ROUTER_INFO_CONGESTION_UPDATE_INTERVAL = 12*60; // in seconds
+	const int ROUTER_INFO_CONGESTION_UPDATE_INTERVAL = 11*60; // in seconds
+	const int ROUTER_INFO_CONGESTION_UPDATE_INTERVAL_VARIANCE = 130; // in seconds 
 	const int ROUTER_INFO_CLEANUP_INTERVAL = 102; // in seconds
 
 	enum RouterStatus
@@ -202,7 +204,8 @@ namespace garlic
 
 			// implements GarlicDestination
 			void HandleI2NPMessage (const uint8_t * buf, size_t len) override;
-			bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload, size_t len, uint32_t msgID) override;
+			bool HandleCloveI2NPMessage (I2NPMessageType typeID, const uint8_t * payload,
+				size_t len, uint32_t msgID, i2p::garlic::ECIESX25519AEADRatchetSession * from) override;
 
 		private:
 
@@ -263,6 +266,10 @@ namespace garlic
 			uint32_t m_PublishReplyToken;
 			bool m_IsHiddenMode; // not publish
 			mutable std::mutex m_RouterInfoMutex;
+			std::mt19937 m_Rng;
+			std::shared_ptr<i2p::data::RouterInfo::Buffer> m_SaveBuffer;
+			std::mutex m_SaveBufferMutex; // TODO: make m_SaveBuffer atomic
+			std::atomic<bool> m_IsSaving;
 	};
 
 	extern RouterContext context;

libi2pd/RouterInfo.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,7 +11,7 @@
 #include "I2PEndian.h"
 #include <fstream>
 #include <memory>
-#include <boost/lexical_cast.hpp>
+#include <charconv>
 #include <boost/algorithm/string.hpp> // for boost::to_lower
 #ifndef __cpp_lib_atomic_shared_ptr
 #include <boost/atomic.hpp>
@@ -25,6 +25,7 @@
 #include "Transports.h"
 #include "NetDb.hpp"
 #include "RouterContext.h"
+#include "CryptoKey.h"
 #include "RouterInfo.h"
 
 namespace i2p
@@ -106,8 +107,7 @@ namespace data
 			// skip identity
 			size_t identityLen = m_RouterIdentity->GetFullLen ();
 			// read new RI
-			std::stringstream str (std::string ((char *)buf + identityLen, len - identityLen));
+			ReadFromBuffer (buf + identityLen, len - identityLen);
-			ReadFromStream (str);
 			if (!m_IsUnreachable)
 				UpdateBuffer (buf, len); // save buffer	
 			// don't delete buffer until saved to the file
@@ -195,39 +195,34 @@ namespace data
 			}
 		}
 		// parse RI
-		std::stringstream str;
+		if (!ReadFromBuffer (m_Buffer->data () + identityLen, bufferLen - identityLen))
-		str.write ((const char *)m_Buffer->data () + identityLen, bufferLen - identityLen);
-		ReadFromStream (str);
-		if (!str)
 		{
 			LogPrint (eLogError, "RouterInfo: Malformed message");
 			m_IsUnreachable = true;
 		}	
 	}
 
-	void RouterInfo::ReadFromStream (std::istream& s)
+	bool RouterInfo::ReadFromBuffer (const uint8_t * buf, size_t len)
 	{
-		if (!s) return;
+		if (len < 9) return false;
 		m_Caps = 0; m_Congestion = eLowCongestion;
-		s.read ((char *)&m_Timestamp, sizeof (m_Timestamp));
+		m_Timestamp = bufbe64toh (buf);
-		m_Timestamp = be64toh (m_Timestamp);
+		size_t offset = 8; // timestamp
 		// read addresses
 		auto addresses = NewAddresses ();
-		uint8_t numAddresses;
+		uint8_t numAddresses = buf[offset]; offset++;
-		s.read ((char *)&numAddresses, sizeof (numAddresses));
 		for (int i = 0; i < numAddresses; i++)
 		{
+			if (offset + 9 > len) return false; // 1 byte cost + 8 bytes date
 			uint8_t supportedTransports = 0;
 			auto address = NewAddress ();
-			uint8_t cost; // ignore
+			offset++; // cost, ignore
-			s.read ((char *)&cost, sizeof (cost));
+			address->date = bufbe64toh (buf + offset); offset += 8; // date
-			s.read ((char *)&address->date, sizeof (address->date));
 			bool isHost = false, isStaticKey = false, isV2 = false, isIntroKey = false;
-			char transportStyle[6];
+			auto transportStyle = ExtractString (buf + offset, len - offset); offset += transportStyle.length () + 1;
-			ReadString (transportStyle, 6, s);
+			if (!transportStyle.compare (0, 4, "NTCP")) // NTCP or NTCP2
-			if (!strncmp (transportStyle, "NTCP", 4)) // NTCP or NTCP2
 				address->transportStyle = eTransportNTCP2;
-			else if (!strncmp (transportStyle, "SSU", 3)) // SSU or SSU2
+			else if (!transportStyle.compare (0, 3, "SSU")) // SSU or SSU2
 			{
 				address->transportStyle = eTransportSSU2;
 				address->ssu.reset (new SSUExt ());
@@ -237,24 +232,22 @@ namespace data
 				address->transportStyle = eTransportUnknown;
 			address->caps = 0;
 			address->port = 0;
-			uint16_t size, r = 0;
+			if (offset + 2 > len) return false;
-			s.read ((char *)&size, sizeof (size)); if (!s) return;
+			uint16_t size = bufbe16toh (buf + offset); offset += 2; // size
-			size = be16toh (size);
+			if (offset + size >= len) return false;
 			if (address->transportStyle == eTransportUnknown)
 			{
 				// skip unknown address
-				s.seekg (size, std::ios_base::cur);
+				offset += size;
-				if (s) continue; else return;
+				continue;
 			}
+			size_t r = 0;
 			while (r < size)
 			{
-				char key[255], value[255];
+				auto [key, value, sz] = ExtractParam (buf + offset, len - offset);
-				r += ReadString (key, 255, s);
+				r += sz; offset += sz;
-				s.seekg (1, std::ios_base::cur); r++; // =
+				if (key.empty ()) continue;
-				r += ReadString (value, 255, s);
+				if (key == "host")
-				s.seekg (1, std::ios_base::cur); r++; // ;
-				if (!s) return;
-				if (!strcmp (key, "host"))
 				{
 					boost::system::error_code ecode;
 					address->host = boost::asio::ip::make_address (value, ecode);
@@ -268,63 +261,53 @@ namespace data
 							address->transportStyle = eTransportUnknown;
 					}
 				}
-				else if (!strcmp (key, "port"))
+				else if (key == "port")
 				{
-					try
+					auto res = std::from_chars(value.data(), value.data() + value.size(), address->port);
-					{
+					if (res.ec != std::errc())
-						address->port = boost::lexical_cast<int>(value);
+						LogPrint (eLogWarning, "RouterInfo: 'port' conversion error: ", std::make_error_code (res.ec).message ());
-					}
-					catch (std::exception& ex)
-					{
-						LogPrint (eLogWarning, "RouterInfo: 'port' exception ", ex.what ());
-					}
 				}
-				else if (!strcmp (key, "mtu"))
+				else if (key == "mtu")
 				{
 					if (address->ssu)
 					{
-						try
+						auto res = std::from_chars(value.data(), value.data() + value.size(), address->ssu->mtu);
-						{
+						if (res.ec != std::errc())
-							address->ssu->mtu = boost::lexical_cast<int>(value);
+							LogPrint (eLogWarning, "RouterInfo: 'mtu' conversion error: ", std::make_error_code (res.ec).message ());
-						}
-						catch (std::exception& ex)
-						{
-							LogPrint (eLogWarning, "RouterInfo: 'mtu' exception ", ex.what ());
-						}
 					}
 					else
 						LogPrint (eLogWarning, "RouterInfo: Unexpected field 'mtu' for NTCP2");
 				}
-				else if (!strcmp (key, "caps"))
+				else if (key == "caps")
 					address->caps = ExtractAddressCaps (value);
-				else if (!strcmp (key, "s")) // ntcp2 or ssu2 static key
+				else if (key == "s") // ntcp2 or ssu2 static key
 				{
-					if (Base64ToByteStream (value, strlen (value), address->s, 32) == 32 &&
+					if (Base64ToByteStream (value, address->s, 32) == 32 &&
 						!(address->s[31] & 0x80)) // check if x25519 public key
 							isStaticKey = true;
 					else
 						address->transportStyle = eTransportUnknown; // invalid address
 				}
-				else if (!strcmp (key, "i")) // ntcp2 iv or ssu2 intro
+				else if (key == "i") // ntcp2 iv or ssu2 intro
 				{
 					if (address->IsNTCP2 ())
 					{
-						if (Base64ToByteStream (value, strlen (value), address->i, 16) == 16)
+						if (Base64ToByteStream (value, address->i, 16) == 16)
 							address->published = true; // presence of "i" means "published" NTCP2
 						else
 							address->transportStyle = eTransportUnknown; // invalid address
 					}
 					else if (address->IsSSU2 ())
 					{	
-						if (Base64ToByteStream (value, strlen (value), address->i, 32) == 32)
+						if (Base64ToByteStream (value, address->i, 32) == 32)
 							isIntroKey = true;
 						else
 							address->transportStyle = eTransportUnknown; // invalid address
 					}	
 				}
-				else if (!strcmp (key, "v"))
+				else if (key == "v")
 				{
-					if (!strcmp (value, "2"))
+					if (value == "2")
 						isV2 = true;
 					else
 					{	
@@ -340,13 +323,11 @@ namespace data
 						LogPrint (eLogError, "RouterInfo: Introducer is presented for non-SSU address. Skipped");
 						continue;
 					}
-					size_t l = strlen(key);
+					unsigned char index = key[key.length () - 1] - '0'; // TODO:
-					unsigned char index = key[l-1] - '0'; // TODO:
-					key[l-1] = 0;
 					if (index > 9)
 					{
 						LogPrint (eLogError, "RouterInfo: Unexpected introducer's index ", index, " skipped");
-						if (s) continue; else return;
+						continue;
 					}
 					if (index >= address->ssu->introducers.size ())
 					{
@@ -355,34 +336,23 @@ namespace data
 						address->ssu->introducers.resize (index + 1);
 					}
 					Introducer& introducer = address->ssu->introducers.at (index);
-					if (!strcmp (key, "itag"))
+					auto key1 = key.substr(0, key.length () - 1);
+					if (key1 == "itag")
 					{
-						try
+						auto res = std::from_chars(value.data(), value.data() + value.size(), introducer.iTag);
-						{
+						if (res.ec != std::errc())
-							introducer.iTag = boost::lexical_cast<uint32_t>(value);
+							LogPrint (eLogWarning, "RouterInfo: 'itag' conversion error: ", std::make_error_code (res.ec).message ());
-						}
-						catch (std::exception& ex)
-						{
-							LogPrint (eLogWarning, "RouterInfo: 'itag' exception ", ex.what ());
-						}
 					}
-					else if (!strcmp (key, "ih"))
+					else if (key1 == "ih")
-						Base64ToByteStream (value, strlen (value), introducer.iH, 32);
+						Base64ToByteStream (value, introducer.iH, 32);
-					else if (!strcmp (key, "iexp"))
+					else if (key1 == "iexp")
 					{
-						try
+						auto res = std::from_chars(value.data(), value.data() + value.size(), introducer.iExp);
-						{
+						if (res.ec != std::errc())
-							introducer.iExp = boost::lexical_cast<uint32_t>(value);
+							LogPrint (eLogWarning, "RouterInfo: 'iexp' conversion error: ", std::make_error_code (res.ec).message ());
-						}
-						catch (std::exception& ex)
-						{
-							LogPrint (eLogWarning, "RouterInfo: 'iexp' exception ", ex.what ());
-						}
 					}
 				}
-				if (!s) return;
 			}	
-			
 			if (address->transportStyle == eTransportNTCP2)
 			{
 				if (isStaticKey)
@@ -446,66 +416,73 @@ namespace data
 		boost::atomic_store (&m_Addresses, addresses);
 #endif
 		// read peers
-		uint8_t numPeers;
+		if (offset + 1 > len) return false;
-		s.read ((char *)&numPeers, sizeof (numPeers)); if (!s) return;
+		uint8_t numPeers = buf[offset]; offset++; // num peers
-		s.seekg (numPeers*32, std::ios_base::cur); // TODO: read peers
+		offset += numPeers*32; // TODO: read peers
 		// read properties
+		if (offset + 2 > len) return false;
 		m_Version = 0;
 		bool isNetId = false;
 		std::string family;
-		uint16_t size, r = 0;
+		uint16_t size = bufbe16toh (buf + offset); offset += 2; // size
-		s.read ((char *)&size, sizeof (size)); if (!s) return;
+		if (offset + size > len) return false;
-		size = be16toh (size);
+		size_t r = 0;
 		while (r < size)
 		{
-			char key[255], value[255];
+			auto [key, value, sz] = ExtractParam (buf + offset, len - offset);
-			r += ReadString (key, 255, s);
+			r += sz; offset += sz;
-			s.seekg (1, std::ios_base::cur); r++; // =
+			if (key.empty ()) continue;
-			r += ReadString (value, 255, s);
-			s.seekg (1, std::ios_base::cur); r++; // ;
-			if (!s) return;
 			SetProperty (key, value);
 
 			// extract caps
-			if (!strcmp (key, "caps"))
+			if (key == "caps")
 			{	
 				ExtractCaps (value);
 				m_IsFloodfill = IsDeclaredFloodfill ();
 			}	
 			// extract version
-			else if (!strcmp (key, ROUTER_INFO_PROPERTY_VERSION))
+			else if (key == ROUTER_INFO_PROPERTY_VERSION)
 			{
 				m_Version = 0;
-				char * ch = value;
+				for (auto ch: value)
-				while (*ch)
 				{
-					if (*ch >= '0' && *ch <= '9')
+					if (ch >= '0' && ch <= '9')
 					{
 						m_Version *= 10;
-						m_Version += (*ch - '0');
+						m_Version += (ch - '0');
+					}
+				}
+				if (m_Version < NETDB_MIN_PEER_TEST_VERSION && (m_SupportedTransports & (eSSU2V4 | eSSU2V6)))
+				{
+					auto addresses = GetAddresses ();
+					if (addresses)
+					{
+						if ((*addresses)[eSSU2V4Idx]) (*addresses)[eSSU2V4Idx]->caps &= ~eSSUTesting;
+						if ((*addresses)[eSSU2V6Idx]) (*addresses)[eSSU2V6Idx]->caps &= ~eSSUTesting;
 					}	
-					ch++;
 				}	
 			}
 			// check netId
-			else if (!strcmp (key, ROUTER_INFO_PROPERTY_NETID))
+			else if (key == ROUTER_INFO_PROPERTY_NETID)
 			{
 				isNetId = true;
-				if (atoi (value) != i2p::context.GetNetID ())
+				int netID;
+				auto res = std::from_chars(value.data(), value.data() + value.size(), netID);
+				if (res.ec != std::errc() || netID != i2p::context.GetNetID ())
 				{
 					LogPrint (eLogError, "RouterInfo: Unexpected ", ROUTER_INFO_PROPERTY_NETID, "=", value);
 					m_IsUnreachable = true;
 				}
 			}
 			// family
-			else if (!strcmp (key, ROUTER_INFO_PROPERTY_FAMILY))
+			else if (key == ROUTER_INFO_PROPERTY_FAMILY)
 			{
 				family = value;
 				boost::to_lower (family);
 			}
-			else if (!strcmp (key, ROUTER_INFO_PROPERTY_FAMILY_SIG))
+			else if (key == ROUTER_INFO_PROPERTY_FAMILY_SIG)
 			{
-				if (netdb.GetFamilies ().VerifyFamily (family, GetIdentHash (), value))
+				if (netdb.GetFamilies ().VerifyFamily (family, GetIdentHash (), value)) // TODO
 					m_FamilyID = netdb.GetFamilies ().GetFamilyID (family);
 				else
 				{	
@@ -513,12 +490,12 @@ namespace data
 					SetUnreachable (true);	
 				}		
 			}
-
-			if (!s) return;
 		}
 
 		if (!m_SupportedTransports || !isNetId || !m_Version)
 			SetUnreachable (true);
+		
+		return true;
 	}	
 		
 	bool RouterInfo::IsFamily (FamilyID famid) const
@@ -526,12 +503,11 @@ namespace data
 		return m_FamilyID == famid;
 	}
 
-	void RouterInfo::ExtractCaps (const char * value)
+	void RouterInfo::ExtractCaps (std::string_view value)
 	{
-		const char * cap = value;
+		for (auto cap: value)
-		while (*cap)
 		{
-			switch (*cap)
+			switch (cap)
 			{
 				case CAPS_FLAG_FLOODFILL:
 					m_Caps |= Caps::eFloodfill;
@@ -540,16 +516,16 @@ namespace data
 				case CAPS_FLAG_LOW_BANDWIDTH2:
 				case CAPS_FLAG_LOW_BANDWIDTH3:
 				case CAPS_FLAG_LOW_BANDWIDTH4:
-					m_BandwidthCap = *cap;
+					m_BandwidthCap = cap;
 				break;
 				case CAPS_FLAG_HIGH_BANDWIDTH:
 					m_Caps |= Caps::eHighBandwidth;
-					m_BandwidthCap = *cap;
+					m_BandwidthCap = cap;
 				break;
 				case CAPS_FLAG_EXTRA_BANDWIDTH1:
 				case CAPS_FLAG_EXTRA_BANDWIDTH2:
 					m_Caps |= Caps::eExtraBandwidth | Caps::eHighBandwidth;
-					m_BandwidthCap = *cap;
+					m_BandwidthCap = cap;
 				break;
 				case CAPS_FLAG_HIDDEN:
 					m_Caps |= Caps::eHidden;
@@ -571,17 +547,15 @@ namespace data
 				break;	
 				default: ;
 			}
-			cap++;
 		}
 	}	
 	
-	uint8_t RouterInfo::ExtractAddressCaps (const char * value) const
+	uint8_t RouterInfo::ExtractAddressCaps (std::string_view value) const
 	{
 		uint8_t caps = 0;
-		const char * cap = value;
+		for (auto cap: value)
-		while (*cap)
 		{
-			switch (*cap)
+			switch (cap)
 			{
 				case CAPS_FLAG_V4:
 					caps |= AddressCaps::eV4;
@@ -597,7 +571,6 @@ namespace data
 				break;
 				default: ;
 			}
-			cap++;
 		}
 		return caps;
 	}	
@@ -661,23 +634,39 @@ namespace data
 		return SaveToFile (fullPath, m_Buffer);
 	}
 
-	size_t RouterInfo::ReadString (char * str, size_t len, std::istream& s) const
+	std::string_view RouterInfo::ExtractString (const uint8_t * buf, size_t len) const
 	{
-		uint8_t l;
+		uint8_t l = buf[0];
-		s.read ((char *)&l, 1);
+		if (l > len)
-		if (l < len)
-		{
-			s.read (str, l);
-			if (!s) l = 0; // failed, return empty string
-			str[l] = 0;
-		}
-		else
 		{
 			LogPrint (eLogWarning, "RouterInfo: String length ", (int)l, " exceeds buffer size ", len);
-			s.seekg (l, std::ios::cur); // skip
+			l = len;
-			str[0] = 0;
 		}	
-		return l+1;
+		return { (const char *)(buf + 1), l };
+	}
+
+	std::tuple<std::string_view, std::string_view, size_t> RouterInfo::ExtractParam (const uint8_t * buf, size_t len) const
+	{
+		auto key = ExtractString (buf, len);
+		size_t offset = key.length () + 1;
+		if (offset >= len) return { std::string_view(), std::string_view(), len };
+		if (buf[offset] != '=')
+		{	
+			LogPrint (eLogWarning, "RouterInfo: Unexpected character ", buf[offset], " instead '=' after ", key);
+			key = std::string_view();
+		}	
+		offset++;
+		if (offset >= len) return { key, std::string_view(), len };
+		auto value = ExtractString (buf + offset, len - offset);
+		offset += value.length () + 1;
+		if (offset >= len) return { key, std::string_view(), len };
+		if (buf[offset] != ';')
+		{	
+			LogPrint (eLogWarning, "RouterInfo: Unexpected character ", buf[offset], " instead ';' after ", value);
+			value = std::string_view();
+		}	
+		offset++;
+		return { key, value, offset };
 	}	
 		
 	void RouterInfo::AddNTCP2Address (const uint8_t * staticKey, const uint8_t * iv,int port, uint8_t caps)
@@ -1136,12 +1125,12 @@ namespace data
 		
 	void RouterInfo::UpdateBuffer (const uint8_t * buf, size_t len)
 	{
+		m_IsBufferScheduledToDelete = false;
 		if (!m_Buffer)
 			m_Buffer = NewBuffer ();
 		if (len > m_Buffer->size ()) len = m_Buffer->size ();
 		memcpy (m_Buffer->data (), buf, len);
 		m_Buffer->SetBufferLen (len);
-		m_IsBufferScheduledToDelete = false;
 	}
 
 	std::shared_ptr<RouterInfo::Buffer> RouterInfo::CopyBuffer () const
@@ -1393,9 +1382,9 @@ namespace data
 						if (!introducer.iTag) continue;
 						if (introducer.iExp) // expiration is specified
 						{
-							WriteString ("iexp" + boost::lexical_cast<std::string>(i), properties);
+							WriteString ("iexp" + std::to_string(i), properties);
 							properties << '=';
-							WriteString (boost::lexical_cast<std::string>(introducer.iExp), properties);
+							WriteString (std::to_string(introducer.iExp), properties);
 							properties << ';';
 						}
 						i++;
@@ -1404,11 +1393,9 @@ namespace data
 					for (const auto& introducer: address.ssu->introducers)
 					{
 						if (!introducer.iTag) continue;
-						WriteString ("ih" + boost::lexical_cast<std::string>(i), properties);
+						WriteString ("ih" + std::to_string(i), properties);
 						properties << '=';
-						char value[64];
+						auto value = ByteStreamToBase64 (introducer.iH, 32);
-						size_t l = ByteStreamToBase64 (introducer.iH, 32, value, 64);
-						value[l] = 0;
 						WriteString (value, properties);
 						properties << ';';
 						i++;
@@ -1417,9 +1404,9 @@ namespace data
 					for (const auto& introducer: address.ssu->introducers)
 					{
 						if (!introducer.iTag) continue;
-						WriteString ("itag" + boost::lexical_cast<std::string>(i), properties);
+						WriteString ("itag" + std::to_string(i), properties);
 						properties << '=';
-						WriteString (boost::lexical_cast<std::string>(introducer.iTag), properties);
+						WriteString (std::to_string(introducer.iTag), properties);
 						properties << ';';
 						i++;
 					}
@@ -1433,7 +1420,7 @@ namespace data
 				{
 					WriteString ("mtu", properties);
 					properties << '=';
-					WriteString (boost::lexical_cast<std::string>(address.ssu->mtu), properties);
+					WriteString (std::to_string(address.ssu->mtu), properties);
 					properties << ';';
 				}
 			}
@@ -1441,7 +1428,7 @@ namespace data
 			{
 				WriteString ("port", properties);
 				properties << '=';
-				WriteString (boost::lexical_cast<std::string>(address.port), properties);
+				WriteString (std::to_string(address.port), properties);
 				properties << ';';
 			}
 			if (address.IsNTCP2 () || address.IsSSU2 ())
@@ -1476,9 +1463,11 @@ namespace data
 		s.write (properties.str ().c_str (), properties.str ().size ());
 	}
 
-	void LocalRouterInfo::SetProperty (const std::string& key, const std::string& value)
+	void LocalRouterInfo::SetProperty (std::string_view key, std::string_view value)
 	{
-		m_Properties[key] = value;
+		auto [it, inserted] = m_Properties.emplace (key, value);
+		if (!inserted)
+			it->second = value;
 	}
 
 	void LocalRouterInfo::DeleteProperty (const std::string& key)

libi2pd/RouterInfo.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -11,6 +11,8 @@
 
 #include <inttypes.h>
 #include <string>
+#include <string_view>
+#include <tuple>
 #include <map>
 #include <vector>
 #include <array>
@@ -208,8 +210,8 @@ namespace data
 			typedef boost::shared_ptr<Addresses> AddressesPtr;
 #endif			
 			RouterInfo (const std::string& fullPath);
-			RouterInfo (const RouterInfo& ) = default;
+			RouterInfo (const RouterInfo& ) = delete;
-			RouterInfo& operator=(const RouterInfo& ) = default;
+			RouterInfo& operator=(const RouterInfo& ) = delete;
 			RouterInfo (std::shared_ptr<Buffer>&& buf, size_t len);
 			RouterInfo (const uint8_t * buf, size_t len);
 			virtual ~RouterInfo ();
@@ -219,7 +221,7 @@ namespace data
 			std::string GetIdentHashBase64 () const { return GetIdentHash ().ToBase64 (); };
 			uint64_t GetTimestamp () const { return m_Timestamp; };
 			int GetVersion () const { return m_Version; };
-			virtual void SetProperty (const std::string& key, const std::string& value) {};
+			virtual void SetProperty (std::string_view key, std::string_view value) {};
 			virtual void ClearProperties () {};
 			AddressesPtr GetAddresses () const; // should be called for local RI only, otherwise must return shared_ptr
 			std::shared_ptr<const Address> GetNTCP2V4Address () const;
@@ -294,6 +296,7 @@ namespace data
 			std::shared_ptr<Buffer> GetSharedBuffer () const { return m_Buffer; };	
 			std::shared_ptr<Buffer> CopyBuffer () const;
 			void ScheduleBufferToDelete () { m_IsBufferScheduledToDelete = true; };
+			void CancelBufferToDelete () { m_IsBufferScheduledToDelete = false; };
 			bool IsBufferScheduledToDelete () const { return m_IsBufferScheduledToDelete; };
 
 			bool IsUpdated () const { return m_IsUpdated; };
@@ -332,11 +335,12 @@ namespace data
 
 			bool LoadFile (const std::string& fullPath);
 			void ReadFromFile (const std::string& fullPath);
-			void ReadFromStream (std::istream& s);
+			bool ReadFromBuffer (const uint8_t * buf, size_t len); // return false if malformed
 			void ReadFromBuffer (bool verifySignature);
-			size_t ReadString (char* str, size_t len, std::istream& s) const;
+			std::string_view ExtractString (const uint8_t * buf, size_t len) const;
-			void ExtractCaps (const char * value);
+			std::tuple<std::string_view, std::string_view, size_t> ExtractParam (const uint8_t * buf, size_t len) const;
-			uint8_t ExtractAddressCaps (const char * value) const;
+			void ExtractCaps (std::string_view value);
+			uint8_t ExtractAddressCaps (std::string_view value) const;
 			void UpdateIntroducers (std::shared_ptr<Address> address, uint64_t ts); 
 			template<typename Filter>
 			std::shared_ptr<const Address> GetAddress (Filter filter) const;
@@ -378,7 +382,7 @@ namespace data
 			void UpdateCaps (uint8_t caps);
 			bool UpdateCongestion (Congestion c); // returns true if updated
 
-			void SetProperty (const std::string& key, const std::string& value) override;
+			void SetProperty (std::string_view key, std::string_view value) override;
 			void DeleteProperty (const std::string& key);
 			std::string GetProperty (const std::string& key) const;
 			void ClearProperties () override { m_Properties.clear (); };

libi2pd/SSU2.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2024, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -890,7 +890,7 @@ namespace transport
 			}
 
 			auto session = std::make_shared<SSU2Session> (*this, router, address);
-			if (!isValidEndpoint && router->GetProfile ()->HasLastEndpoint (address->IsV4 ()))
+			if (!isValidEndpoint && router->HasProfile () && router->GetProfile ()->HasLastEndpoint (address->IsV4 ()))
 			{
 				// router doesn't publish endpoint, but we connected before and hole punch might be alive
 				auto ep = router->GetProfile ()->GetLastEndpoint ();
@@ -1251,18 +1251,21 @@ namespace transport
 		}
 		uint64_t token;
 		RAND_bytes ((uint8_t *)&token, 8);
-		m_IncomingTokens.emplace (ep, std::make_pair (token, uint32_t(ts + SSU2_TOKEN_EXPIRATION_TIMEOUT)));
+		if (!token) token = 1; // token can't be zero
+		m_IncomingTokens.try_emplace (ep, token, uint32_t(ts + SSU2_TOKEN_EXPIRATION_TIMEOUT));
 		return token;
 	}
 
 	std::pair<uint64_t, uint32_t> SSU2Server::NewIncomingToken (const boost::asio::ip::udp::endpoint& ep)
 	{
-		m_IncomingTokens.erase (ep); // drop previous
 		uint64_t token;
 		RAND_bytes ((uint8_t *)&token, 8);
-		auto ret = std::make_pair (token, uint32_t(i2p::util::GetSecondsSinceEpoch () + SSU2_NEXT_TOKEN_EXPIRATION_TIMEOUT));
+		if (!token) token = 1; // token can't be zero
-		m_IncomingTokens.emplace (ep, ret);
+		uint32_t expires = i2p::util::GetSecondsSinceEpoch () + SSU2_NEXT_TOKEN_EXPIRATION_TIMEOUT;
-		return ret;
+		auto [it, inserted] = m_IncomingTokens.try_emplace (ep, token, expires);
+		if (!inserted)
+			it->second = { token, expires }; // override
+		return it->second;
 	}
 
 	std::vector<std::shared_ptr<SSU2Session> > SSU2Server::FindIntroducers (int maxNumIntroducers,
@@ -1528,6 +1531,11 @@ namespace transport
 		return m_Decryptor.Decrypt (msg, msgLen, ad, adLen, key, nonce, buf, len);
 	}
 
+	void SSU2Server::ChaCha20 (const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out)
+	{
+		m_ChaCha20 (msg, msgLen, key, nonce, out);
+	}	
+		
 	void SSU2Server::SendThroughProxy (const uint8_t * header, size_t headerLen, const uint8_t * headerX, size_t headerXLen,
 		const uint8_t * payload, size_t payloadLen, const boost::asio::ip::udp::endpoint& to)
 	{

libi2pd/SSU2.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2024, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -86,6 +86,7 @@ namespace transport
 				const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len); 
 			bool AEADChaCha20Poly1305Decrypt (const uint8_t * msg, size_t msgLen, const uint8_t * ad, size_t adLen,
 				const uint8_t * key, const uint8_t * nonce, uint8_t * buf, size_t len); 
+			void ChaCha20 (const uint8_t * msg, size_t msgLen, const uint8_t * key, const uint8_t * nonce, uint8_t * out);
 			bool IsMaxNumIntroducers (bool v4) const { return (v4 ? m_Introducers.size () : m_IntroducersV6.size ()) >= SSU2_MAX_NUM_INTRODUCERS; }
 			bool IsSyncClockFromPeers () const { return m_IsSyncClockFromPeers; };
 			void AdjustTimeOffset (int64_t offset, std::shared_ptr<const i2p::data::IdentityEx> from);
@@ -206,6 +207,7 @@ namespace transport
 			mutable std::mutex m_ReceivedPacketsQueueMutex;
 			i2p::crypto::AEADChaCha20Poly1305Encryptor m_Encryptor;
 			i2p::crypto::AEADChaCha20Poly1305Decryptor m_Decryptor;
+			i2p::crypto::ChaCha20Context m_ChaCha20;
 		
 			// proxy
 			bool m_IsThroughProxy;

libi2pd/SSU2OutOfSession.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2024, The PurpleI2P Project
+* Copyright (c) 2024-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -46,7 +46,7 @@ namespace transport
 		}
 		uint8_t nonce[12] = {0};
 		uint64_t headerX[2]; // sourceConnID, token
-		i2p::crypto::ChaCha20 (buf + 16, 16, i2p::context.GetSSU2IntroKey (), nonce, (uint8_t *)headerX);
+		GetServer ().ChaCha20 (buf + 16, 16, i2p::context.GetSSU2IntroKey (), nonce, (uint8_t *)headerX);
 		SetDestConnID (headerX[0]);
 		// decrypt and handle payload
 		uint8_t * payload = buf + 32;
@@ -183,7 +183,7 @@ namespace transport
 		header.ll[0] ^= CreateHeaderMask (addr->i, payload + (payloadSize - 24));
 		header.ll[1] ^= CreateHeaderMask (addr->i, payload + (payloadSize - 12));
 		memset (n, 0, 12);
-		i2p::crypto::ChaCha20 (h + 16, 16, addr->i, n, h + 16);
+		GetServer ().ChaCha20 (h + 16, 16, addr->i, n, h + 16);
 		// send
 		GetServer ().Send (header.buf, 16, h + 16, 16, payload, payloadSize, GetRemoteEndpoint ());
 		UpdateNumSentBytes (payloadSize + 32);
@@ -191,12 +191,7 @@ namespace transport
 
 	void SSU2PeerTestSession::SendPeerTest (uint8_t msg, const uint8_t * signedData, size_t signedDataLen, bool delayed)
 	{
-#if __cplusplus >= 202002L // C++20
 		m_SignedData.assign (signedData, signedData + signedDataLen);
-#else		
-		m_SignedData.resize (signedDataLen);
-		memcpy (m_SignedData.data (), signedData, signedDataLen);
-#endif		
 		if (!delayed)
 			SendPeerTest (msg);
 		// schedule resend for msgs 5 or 6
@@ -257,7 +252,7 @@ namespace transport
 	{
 		// we are Charlie
 		uint64_t destConnID = htobe64 (((uint64_t)nonce << 32) | nonce); // dest id
-		uint32_t sourceConnID = ~destConnID;
+		uint64_t sourceConnID = ~destConnID;
 		SetSourceConnID (sourceConnID);
 		SetDestConnID (destConnID);	
 		SetState (eSSU2SessionStateHolePunch);
@@ -305,7 +300,7 @@ namespace transport
 		header.ll[0] ^= CreateHeaderMask (addr->i, payload + (payloadSize - 24));
 		header.ll[1] ^= CreateHeaderMask (addr->i, payload + (payloadSize - 12));
 		memset (n, 0, 12);
-		i2p::crypto::ChaCha20 (h + 16, 16, addr->i, n, h + 16);
+		GetServer ().ChaCha20 (h + 16, 16, addr->i, n, h + 16);
 		// send
 		GetServer ().Send (header.buf, 16, h + 16, 16, payload, payloadSize, ep);
 		UpdateNumSentBytes (payloadSize + 32);
@@ -313,12 +308,7 @@ namespace transport
 
 	void SSU2HolePunchSession::SendHolePunch (const uint8_t * relayResponseBlock, size_t relayResponseBlockLen)
 	{
-#if __cplusplus >= 202002L // C++20
 		m_RelayResponseBlock.assign (relayResponseBlock, relayResponseBlock + relayResponseBlockLen);
-#else		
-		m_RelayResponseBlock.resize (relayResponseBlockLen);
-		memcpy (m_RelayResponseBlock.data (), relayResponseBlock, relayResponseBlockLen);
-#endif		
 		SendHolePunch ();
 		ScheduleResend ();
 	}	

libi2pd/SSU2Session.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2024, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -92,7 +92,7 @@ namespace transport
 		m_RTO (SSU2_INITIAL_RTO), m_RelayTag (0),m_ConnectTimer (server.GetService ()), 
 		m_TerminationReason (eSSU2TerminationReasonNormalClose),
 		m_MaxPayloadSize (SSU2_MIN_PACKET_SIZE - IPV6_HEADER_SIZE - UDP_HEADER_SIZE - 32), // min size
-		m_LastResendTime (0), m_LastResendAttemptTime (0)
+		m_LastResendTime (0), m_LastResendAttemptTime (0), m_NumRanges (0)
 	{
 		if (noise)	
 			m_NoiseState.reset (new i2p::crypto::NoiseSymmetricState);
@@ -189,7 +189,7 @@ namespace transport
 		if (!asz) return false;
 		payload[17] = asz;
 		packet->payloadSize = asz + 18;
-		SignedData s;
+		SignedData<128> s;
 		s.Insert ((const uint8_t *)"RelayRequestData", 16); // prologue
 		s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash
 		s.Insert (session->GetRemoteIdentity ()->GetIdentHash (), 32); // chash
@@ -623,7 +623,8 @@ namespace transport
 				}
 				else
 				{
-					uint32_t packetNum = SendData (it->second->payload, it->second->payloadSize);
+					uint32_t packetNum = SendData (it->second->payload, it->second->payloadSize, 
+						it->second->numResends > 1 ? SSU2_FLAG_IMMEDIATE_ACK_REQUESTED : 0);
 					it->second->numResends++;
 					it->second->sendTime = ts;
 					resentPackets.emplace (packetNum, it->second);
@@ -682,7 +683,7 @@ namespace transport
 				}
 				const uint8_t nonce[12] = {0};
 				uint64_t headerX[2];
-				i2p::crypto::ChaCha20 (buf + 16, 16, i2p::context.GetSSU2IntroKey (), nonce, (uint8_t *)headerX);
+				m_Server.ChaCha20 (buf + 16, 16, i2p::context.GetSSU2IntroKey (), nonce, (uint8_t *)headerX);
 				LogPrint (eLogWarning, "SSU2: Unexpected PeerTest message SourceConnID=", connID, " DestConnID=", headerX[0]);
 				break;
 			}
@@ -748,7 +749,7 @@ namespace transport
 		payloadSize += 16;
 		header.ll[0] ^= CreateHeaderMask (m_Address->i, payload + (payloadSize - 24));
 		header.ll[1] ^= CreateHeaderMask (m_Address->i, payload + (payloadSize - 12));
-		i2p::crypto::ChaCha20 (headerX, 48, m_Address->i, nonce, headerX);
+		m_Server.ChaCha20 (headerX, 48, m_Address->i, nonce, headerX);
 		m_NoiseState->MixHash (payload, payloadSize); // h = SHA256(h || encrypted payload from Session Request) for SessionCreated
 		m_SentHandshakePacket->payloadSize = payloadSize;
 		// send
@@ -775,7 +776,7 @@ namespace transport
 		}
 		const uint8_t nonce[12] = {0};
 		uint8_t headerX[48];
-		i2p::crypto::ChaCha20 (buf + 16, 48, i2p::context.GetSSU2IntroKey (), nonce, headerX);
+		m_Server.ChaCha20 (buf + 16, 48, i2p::context.GetSSU2IntroKey (), nonce, headerX);
 		memcpy (&m_DestConnID, headerX, 8);
 		uint64_t token;
 		memcpy (&token, headerX + 8, 8);
@@ -874,7 +875,7 @@ namespace transport
 		m_NoiseState->MixHash (payload, payloadSize); // h = SHA256(h || encrypted Noise payload from Session Created)
 		header.ll[0] ^= CreateHeaderMask (i2p::context.GetSSU2IntroKey (), payload + (payloadSize - 24));
 		header.ll[1] ^= CreateHeaderMask (kh2, payload + (payloadSize - 12));
-		i2p::crypto::ChaCha20 (headerX, 48, kh2, nonce, headerX);
+		m_Server.ChaCha20 (headerX, 48, kh2, nonce, headerX);
 		m_State = eSSU2SessionStateSessionCreatedSent;
 		m_SentHandshakePacket->payloadSize = payloadSize;
 		// send
@@ -902,7 +903,7 @@ namespace transport
 		m_HandshakeInterval = i2p::util::GetMillisecondsSinceEpoch () - m_HandshakeInterval;
 		const uint8_t nonce[12] = {0};
 		uint8_t headerX[48];
-		i2p::crypto::ChaCha20 (buf + 16, 48, kh2, nonce, headerX);
+		m_Server.ChaCha20 (buf + 16, 48, kh2, nonce, headerX);
 		// KDF for SessionCreated
 		m_NoiseState->MixHash ( { {header.buf, 16}, {headerX, 16} } ); // h = SHA256(h || header)
 		m_NoiseState->MixHash (headerX + 16, 32); // h = SHA256(h || bepk);
@@ -1178,13 +1179,18 @@ namespace transport
 			LogPrint (eLogError, "SSU2: Couldn't update RouterInfo from SessionConfirmed in netdb");
 			return false;
 		}
-		std::shared_ptr<i2p::data::RouterProfile> profile; // not null if older 
+		
+		bool isOlder = false;
 		if (ri->GetTimestamp () + i2p::data::NETDB_EXPIRATION_TIMEOUT_THRESHOLD*1000LL < ri1->GetTimestamp ())
 		{	
 			// received RouterInfo is older than one in netdb
-			profile = i2p::data::GetRouterProfile (ri->GetIdentHash ()); // retrieve profile	
+			isOlder = true;
-			if (profile && profile->IsDuplicated ())
+			if (ri->HasProfile ())
-				return false;
+			{	
+				auto profile = i2p::data::GetRouterProfile (ri->GetIdentHash ()); // retrieve profile	
+				if (profile && profile->IsDuplicated ())
+					return false;
+			}	
 		}	
 		ri = ri1;
 		
@@ -1198,15 +1204,28 @@ namespace transport
 		    (!m_RemoteEndpoint.address ().is_v6 () ||
 			 memcmp (m_RemoteEndpoint.address ().to_v6 ().to_bytes ().data (), m_Address->host.to_v6 ().to_bytes ().data (), 8))) // temporary address
 		{
-			if (profile) // older router?
+			if (isOlder) // older router?
-				profile->Duplicated (); // mark router as duplicated in profile
+				i2p::data::UpdateRouterProfile (ri->GetIdentHash (),
+					[](std::shared_ptr<i2p::data::RouterProfile> profile)
+					{
+						if (profile) profile->Duplicated (); // mark router as duplicated in profile
+					});
 			else	
 				LogPrint (eLogInfo, "SSU2: Host mismatch between published address ", m_Address->host,
 					" and actual endpoint ", m_RemoteEndpoint.address (), " from ", i2p::data::GetIdentHashAbbreviation (ri->GetIdentHash ()));
 			return false;
 		}
 		if (!m_Address->published)
-			ri->GetProfile ()->SetLastEndpoint (m_RemoteEndpoint);
+		{	
+			if (ri->HasProfile ())	
+				ri->GetProfile ()->SetLastEndpoint (m_RemoteEndpoint);
+			else
+				i2p::data::UpdateRouterProfile (ri->GetIdentHash (), 
+					[ep = m_RemoteEndpoint](std::shared_ptr<i2p::data::RouterProfile> profile)
+				    {
+						if (profile) profile->SetLastEndpoint (ep);
+					});	
+		}	
 		SetRemoteIdentity (ri->GetRouterIdentity ());
 		AdjustMaxPayloadSize ();
 		m_Server.AddSessionByRouterHash (shared_from_this ()); // we know remote router now
@@ -1264,7 +1283,7 @@ namespace transport
 		header.ll[0] ^= CreateHeaderMask (m_Address->i, payload + (payloadSize - 24));
 		header.ll[1] ^= CreateHeaderMask (m_Address->i, payload + (payloadSize - 12));
 		memset (nonce, 0, 12);
-		i2p::crypto::ChaCha20 (h + 16, 16, m_Address->i, nonce, h + 16);
+		m_Server.ChaCha20 (h + 16, 16, m_Address->i, nonce, h + 16);
 		// send
 		if (m_Server.AddPendingOutgoingSession (shared_from_this ()))
 			m_Server.Send (header.buf, 16, h + 16, 16, payload, payloadSize, m_RemoteEndpoint);
@@ -1286,7 +1305,7 @@ namespace transport
 		uint8_t nonce[12] = {0};
 		uint8_t h[32];
 		memcpy (h, header.buf, 16);
-		i2p::crypto::ChaCha20 (buf + 16, 16, i2p::context.GetSSU2IntroKey (), nonce, h + 16);
+		m_Server.ChaCha20 (buf + 16, 16, i2p::context.GetSSU2IntroKey (), nonce, h + 16);
 		memcpy (&m_DestConnID, h + 16, 8);
 		// decrypt
 		CreateNonce (be32toh (header.h.packetNum), nonce);
@@ -1338,7 +1357,7 @@ namespace transport
 		header.ll[0] ^= CreateHeaderMask (i2p::context.GetSSU2IntroKey (), payload + (payloadSize - 24));
 		header.ll[1] ^= CreateHeaderMask (i2p::context.GetSSU2IntroKey (), payload + (payloadSize - 12));
 		memset (nonce, 0, 12);
-		i2p::crypto::ChaCha20 (h + 16, 16, i2p::context.GetSSU2IntroKey (), nonce, h + 16);
+		m_Server.ChaCha20 (h + 16, 16, i2p::context.GetSSU2IntroKey (), nonce, h + 16);
 		// send
 		m_Server.Send (header.buf, 16, h + 16, 16, payload, payloadSize, m_RemoteEndpoint);
 	}
@@ -1362,7 +1381,7 @@ namespace transport
 		}
 		uint8_t nonce[12] = {0};
 		uint64_t headerX[2]; // sourceConnID, token
-		i2p::crypto::ChaCha20 (buf + 16, 16, m_Address->i, nonce, (uint8_t *)headerX);
+		m_Server.ChaCha20 (buf + 16, 16, m_Address->i, nonce, (uint8_t *)headerX);
 		uint64_t token = headerX[1];
 		if (token)
 			m_Server.UpdateOutgoingToken (m_RemoteEndpoint, token, i2p::util::GetSecondsSinceEpoch () + SSU2_TOKEN_EXPIRATION_TIMEOUT);
@@ -1411,7 +1430,7 @@ namespace transport
 		}
 		uint8_t nonce[12] = {0};
 		uint64_t headerX[2]; // sourceConnID, token
-		i2p::crypto::ChaCha20 (buf + 16, 16, i2p::context.GetSSU2IntroKey (), nonce, (uint8_t *)headerX);
+		m_Server.ChaCha20 (buf + 16, 16, i2p::context.GetSSU2IntroKey (), nonce, (uint8_t *)headerX);
 		m_DestConnID = headerX[0];
 		// decrypt and handle payload
 		uint8_t * payload = buf + 32;
@@ -1479,11 +1498,11 @@ namespace transport
 				ResendHandshakePacket (); // assume we receive
 			return;
 		}
-		if (from != m_RemoteEndpoint && !i2p::transport::transports.IsInReservedRange (from.address ()))
+		if (from != m_RemoteEndpoint && !i2p::transport::transports.IsInReservedRange (from.address ()) &&
+		    (!m_PathChallenge || from != m_PathChallenge->second)) // path challenge was not sent to this endpoint yet 
 		{
 			LogPrint (eLogInfo, "SSU2: Remote endpoint update ", m_RemoteEndpoint, "->", from);
-			m_RemoteEndpoint = from;
+			SendPathChallenge (from);
-			SendPathChallenge ();
 		}
 		if (len < 32)
 		{
@@ -1641,10 +1660,11 @@ namespace transport
 					LogPrint (eLogDebug, "SSU2: Path response");
 					if (m_PathChallenge)
 					{
-						i2p::data::IdentHash hash;
+						if (buf64toh (buf + offset) == m_PathChallenge->first)
-						SHA256 (buf + offset, size, hash);
+						{
-						if (hash == *m_PathChallenge)
+							m_RemoteEndpoint = m_PathChallenge->second;
 							m_PathChallenge.reset (nullptr);
+						}	
 					}
 					break;
 				}
@@ -1744,6 +1764,7 @@ namespace transport
 		HandleAckRange (firstPacketNum, ackThrough, i2p::util::GetMillisecondsSinceEpoch ()); // acnt
 		// ranges
 		len -= 5;
+		if (!len || m_SentPackets.empty ()) return; // don't handle ranges if nothing to acknowledge
 		const uint8_t * ranges = buf + 5;
 		while (len > 0 && firstPacketNum && ackThrough - firstPacketNum < SSU2_MAX_NUM_ACK_PACKETS)
 		{
@@ -1945,6 +1966,7 @@ namespace transport
 	void SSU2Session::HandleRelayRequest (const uint8_t * buf, size_t len)
 	{
 		// we are Bob
+		if (len < 9) return;
 		auto mts = i2p::util::GetMillisecondsSinceEpoch ();
 		uint32_t nonce = bufbe32toh (buf + 1); // nonce
 		uint32_t relayTag = bufbe32toh (buf + 5); // relay tag
@@ -1978,7 +2000,7 @@ namespace transport
 			packet->payloadSize = r ? CreateRouterInfoBlock (packet->payload, m_MaxPayloadSize - len - 32, r) : 0;
 			if (!packet->payloadSize && r)
 				session->SendFragmentedMessage (CreateDatabaseStoreMsg (r));
-			packet->payloadSize += CreateRelayIntroBlock (packet->payload + packet->payloadSize, m_MaxPayloadSize - packet->payloadSize, buf + 1, len -1);
+			packet->payloadSize += CreateRelayIntroBlock (packet->payload + packet->payloadSize, m_MaxPayloadSize - packet->payloadSize, buf + 1, len - 1);
 			if (packet->payloadSize < m_MaxPayloadSize)
 				packet->payloadSize += CreatePaddingBlock (packet->payload + packet->payloadSize, m_MaxPayloadSize - packet->payloadSize);
 			uint32_t packetNum = session->SendData (packet->payload, packet->payloadSize);
@@ -1993,18 +2015,24 @@ namespace transport
 	void SSU2Session::HandleRelayIntro (const uint8_t * buf, size_t len, int attempts)
 	{
 		// we are Charlie
+		if (len < 47) return;
 		SSU2RelayResponseCode code = eSSU2RelayResponseCodeAccept;
 		boost::asio::ip::udp::endpoint ep;
 		std::shared_ptr<const i2p::data::RouterInfo::Address> addr;
 		auto r = i2p::data::netdb.FindRouter (buf + 1); // Alice
 		if (r)
 		{
-			SignedData s;
+			SignedData<128> s;
 			s.Insert ((const uint8_t *)"RelayRequestData", 16); // prologue
 			s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash
 			s.Insert (i2p::context.GetIdentHash (), 32); // chash
 			s.Insert (buf + 33, 14); // nonce, relay tag, timestamp, ver, asz
 			uint8_t asz = buf[46];
+			if (asz + 47 + r->GetIdentity ()->GetSignatureLen () > len) 
+			{	
+				LogPrint (eLogWarning, "SSU2: Malformed RelayIntro len=", len);
+				return; 
+			}	
 			s.Insert (buf + 47, asz); // Alice Port, Alice IP
 			if (s.Verify (r->GetIdentity (), buf + 47 + asz))
 			{
@@ -2093,6 +2121,7 @@ namespace transport
 
 	void SSU2Session::HandleRelayResponse (const uint8_t * buf, size_t len)
 	{
+		if (len < 6) return;
 		uint32_t nonce = bufbe32toh (buf + 2);
 		if (m_State == eSSU2SessionStateIntroduced)
 		{
@@ -2113,7 +2142,9 @@ namespace transport
 		auto it = m_RelaySessions.find (nonce);
 		if (it != m_RelaySessions.end ())
 		{
-			if (it->second.first && it->second.first->IsEstablished ())
+			auto relaySession = it->second.first;
+			m_RelaySessions.erase (it);
+			if (relaySession && relaySession->IsEstablished ())
 			{
 				// we are Bob, message from Charlie
 				auto packet = m_Server.GetSentPacketsPool ().AcquireShared ();
@@ -2123,12 +2154,12 @@ namespace transport
 				memcpy (payload + 3, buf, len); // forward to Alice as is
 				packet->payloadSize = len + 3;
 				packet->payloadSize += CreatePaddingBlock (payload + packet->payloadSize, m_MaxPayloadSize - packet->payloadSize);
-				uint32_t packetNum = it->second.first->SendData (packet->payload, packet->payloadSize);
+				uint32_t packetNum = relaySession->SendData (packet->payload, packet->payloadSize);
 				if (m_RemoteVersion >= SSU2_MIN_RELAY_RESPONSE_RESEND_VERSION)
 				{	
 					// sometimes Alice doesn't ack this RelayResponse in older versions
 					packet->sendTime = i2p::util::GetMillisecondsSinceEpoch ();
-					it->second.first->m_SentPackets.emplace (packetNum, packet);
+					relaySession->m_SentPackets.emplace (packetNum, packet);
 				}	
 			}
 			else
@@ -2137,25 +2168,31 @@ namespace transport
 				if (!buf[1]) // status code accepted?
 				{
 					// verify signature
-					uint8_t csz = buf[11];
+					uint8_t csz = (len >= 12) ? buf[11] : 0;
-					SignedData s;
+					if (csz + 12 + relaySession->GetRemoteIdentity ()->GetSignatureLen () > len)
+					{
+						LogPrint (eLogWarning, "SSU2: Malformed RelayResponse len=", len);
+						relaySession->Done ();
+						return;
+					}	
+					SignedData<128> s;
 					s.Insert ((const uint8_t *)"RelayAgreementOK", 16); // prologue
 					s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash
 					s.Insert (buf + 2, 10 + csz); // nonce, timestamp, ver, csz and Charlie's endpoint
-					if (s.Verify (it->second.first->GetRemoteIdentity (), buf + 12 + csz))
+					if (s.Verify (relaySession->GetRemoteIdentity (), buf + 12 + csz))
 					{
-						if (it->second.first->m_State == eSSU2SessionStateIntroduced) // HolePunch not received yet
+						if (relaySession->m_State == eSSU2SessionStateIntroduced) // HolePunch not received yet
 						{
 							// update Charlie's endpoint
-							if (ExtractEndpoint (buf + 12, csz, it->second.first->m_RemoteEndpoint))
+							if (ExtractEndpoint (buf + 12, csz, relaySession->m_RemoteEndpoint))
 							{
 								// update token
 								uint64_t token;
 								memcpy (&token, buf + len - 8, 8);
-								m_Server.UpdateOutgoingToken (it->second.first->m_RemoteEndpoint,
+								m_Server.UpdateOutgoingToken (relaySession->m_RemoteEndpoint,
 									token, i2p::util::GetSecondsSinceEpoch () + SSU2_TOKEN_EXPIRATION_TIMEOUT);
 								// connect to Charlie, HolePunch will be ignored
-								it->second.first->ConnectAfterIntroduction ();
+								relaySession->ConnectAfterIntroduction ();
 							}
 							else
 								LogPrint (eLogWarning, "SSU2: RelayResponse can't extract endpoint");
@@ -2164,16 +2201,15 @@ namespace transport
 					else
 					{
 						LogPrint (eLogWarning, "SSU2: RelayResponse signature verification failed");
-						it->second.first->Done ();
+						relaySession->Done ();
 					}
 				}
 				else
 				{
 					LogPrint (eLogInfo, "SSU2: RelayResponse status code=", (int)buf[1], " nonce=", bufbe32toh (buf + 2));
-					it->second.first->Done ();
+					relaySession->Done ();
 				}
 			}
-			m_RelaySessions.erase (it);
 		}
 		else
 			LogPrint (eLogDebug, "SSU2: RelayResponse unknown nonce ", bufbe32toh (buf + 2));
@@ -2242,10 +2278,13 @@ namespace transport
 			case 2: // Charlie from Bob
 			{
 				// sign with Charlie's key
+				if (len < offset + 9) return;
 				uint8_t asz = buf[offset + 9];
-				std::vector<uint8_t> newSignedData (asz + 10 + i2p::context.GetIdentity ()->GetSignatureLen ());
+				size_t l = asz + 10 + i2p::context.GetIdentity ()->GetSignatureLen ();
+				if (len < offset + l) return;
+				std::vector<uint8_t> newSignedData (l);
 				memcpy (newSignedData.data (), buf + offset, asz + 10);
-				SignedData s;
+				SignedData<128> s;
 				s.Insert ((const uint8_t *)"PeerTestValidate", 16); // prologue
 				s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash
 				s.Insert (buf + 3, 32); // ahash
@@ -2353,10 +2392,16 @@ namespace transport
 						if (GetRouterStatus () == eRouterStatusUnknown)
 							SetTestingState (true);
 						auto r = i2p::data::netdb.FindRouter (buf + 3); // find Charlie
-						if (r)
+						if (r && len >= offset + 9)
 						{
 							uint8_t asz = buf[offset + 9];
-							SignedData s;
+							if (len < offset + asz + 10 + r->GetIdentity ()->GetSignatureLen ())
+							{
+								LogPrint (eLogWarning, "Malformed PeerTest 4 len=", len);
+								session->Done ();
+								return;
+							}	
+							SignedData<128> s;
 							s.Insert ((const uint8_t *)"PeerTestValidate", 16); // prologue
 							s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash
 							s.Insert (i2p::context.GetIdentity ()->GetIdentHash (), 32); // ahash
@@ -2515,17 +2560,19 @@ namespace transport
 		return nullptr;
 	}
 
-	void SSU2Session::AdjustMaxPayloadSize ()
+	void SSU2Session::AdjustMaxPayloadSize (size_t maxMtu)
 	{
 		auto addr = FindLocalAddress ();
 		if (addr && addr->ssu)
 		{
 			int mtu = addr->ssu->mtu;
 			if (!mtu && addr->IsV4 ()) mtu = SSU2_MAX_PACKET_SIZE;
+			if (mtu > (int)maxMtu) mtu = maxMtu;
 			if (m_Address && m_Address->ssu && (!mtu || m_Address->ssu->mtu < mtu))
 				mtu = m_Address->ssu->mtu;
 			if (mtu)
 			{
+				if (mtu > (int)SSU2_MAX_PACKET_SIZE) mtu = SSU2_MAX_PACKET_SIZE;
 				if (mtu < (int)SSU2_MIN_PACKET_SIZE) mtu = SSU2_MIN_PACKET_SIZE;
 				m_MaxPayloadSize = mtu - (addr->IsV6 () ? IPV6_HEADER_SIZE: IPV4_HEADER_SIZE) - UDP_HEADER_SIZE - 32;
 				LogPrint (eLogDebug, "SSU2: Session MTU=", mtu, ", max payload size=", m_MaxPayloadSize);
@@ -2624,17 +2671,17 @@ namespace transport
 	size_t SSU2Session::CreateAckBlock (uint8_t * buf, size_t len)
 	{
 		if (len < 8) return 0;
-		int maxNumRanges = (len - 8) >> 1;
-		if (maxNumRanges > SSU2_MAX_NUM_ACK_RANGES) maxNumRanges = SSU2_MAX_NUM_ACK_RANGES;
 		buf[0] = eSSU2BlkAck;
 		uint32_t ackThrough = m_OutOfSequencePackets.empty () ? m_ReceivePacketNum : *m_OutOfSequencePackets.rbegin ();
 		htobe32buf (buf + 3, ackThrough); // Ack Through
 		uint16_t acnt = 0;
-		int numRanges = 0;
 		if (ackThrough)
 		{
 			if (m_OutOfSequencePackets.empty ())
+			{	
 				acnt = std::min ((int)ackThrough, SSU2_MAX_NUM_ACNT); // no gaps
+				m_NumRanges = 0;
+			}	
 			else
 			{
 				auto it = m_OutOfSequencePackets.rbegin (); it++; // prev packet num
@@ -2647,93 +2694,102 @@ namespace transport
 						it++;
 				}
 				// ranges
-				uint32_t lastNum = ackThrough - acnt;
+				if (!m_NumRanges)
-				if (acnt > SSU2_MAX_NUM_ACNT)
 				{	
-					auto d = std::div (acnt - SSU2_MAX_NUM_ACNT, SSU2_MAX_NUM_ACNT);
+					int maxNumRanges = (len - 8) >> 1;
-					acnt = SSU2_MAX_NUM_ACNT;
+					if (maxNumRanges > SSU2_MAX_NUM_ACK_RANGES) maxNumRanges = SSU2_MAX_NUM_ACK_RANGES;
-					if (d.quot > maxNumRanges)
+					int numRanges = 0;
+					uint32_t lastNum = ackThrough - acnt;
+					if (acnt > SSU2_MAX_NUM_ACNT)
 					{
-						d.quot = maxNumRanges;
+						auto d = std::div (acnt - SSU2_MAX_NUM_ACNT, SSU2_MAX_NUM_ACNT);
-						d.rem = 0;
+						acnt = SSU2_MAX_NUM_ACNT;
-					}
+						if (d.quot > maxNumRanges)
-					// Acks only ranges for acnt
-					for (int i = 0; i < d.quot; i++)
-					{
-						buf[8 + numRanges*2] = 0; buf[8 + numRanges*2 + 1] = SSU2_MAX_NUM_ACNT; // NACKs 0, Acks 255
-						numRanges++;
-					}
-					if (d.rem > 0)
-					{
-						buf[8 + numRanges*2] = 0; buf[8 + numRanges*2 + 1] = d.rem;
-						numRanges++;
-					}
-				}
-				int numPackets = acnt + numRanges*SSU2_MAX_NUM_ACNT;
-				while (it != m_OutOfSequencePackets.rend () &&
-					numRanges < maxNumRanges && numPackets < SSU2_MAX_NUM_ACK_PACKETS)
-				{
-					if (lastNum - (*it) > SSU2_MAX_NUM_ACNT)
-					{
-						// NACKs only ranges
-						if (lastNum > (*it) + SSU2_MAX_NUM_ACNT*(maxNumRanges - numRanges)) break; // too many NACKs
-						while (lastNum - (*it) > SSU2_MAX_NUM_ACNT)
 						{
-							buf[8 + numRanges*2] = SSU2_MAX_NUM_ACNT; buf[8 + numRanges*2 + 1] = 0; // NACKs 255, Acks 0
+							d.quot = maxNumRanges;
-							lastNum -= SSU2_MAX_NUM_ACNT;
+							d.rem = 0;
+						}
+						// Acks only ranges for acnt
+						for (int i = 0; i < d.quot; i++)
+						{
+							m_Ranges[numRanges*2] = 0; m_Ranges[numRanges*2 + 1] = SSU2_MAX_NUM_ACNT; // NACKs 0, Acks 255
+							numRanges++;
+						}
+						if (d.rem > 0)
+						{
+							m_Ranges[numRanges*2] = 0; m_Ranges[numRanges*2 + 1] = d.rem;
 							numRanges++;
-							numPackets += SSU2_MAX_NUM_ACNT;
 						}
 					}
-					// NACKs and Acks ranges
+					int numPackets = acnt + numRanges*SSU2_MAX_NUM_ACNT;
-					buf[8 + numRanges*2] = lastNum - (*it) - 1; // NACKs
+					while (it != m_OutOfSequencePackets.rend () &&
-					numPackets += buf[8 + numRanges*2];
+						numRanges < maxNumRanges && numPackets < SSU2_MAX_NUM_ACK_PACKETS)
-					lastNum = *it; it++;
-					int numAcks = 1;
-					while (it != m_OutOfSequencePackets.rend () && lastNum > 0 && *it == lastNum - 1)
 					{
-						numAcks++; lastNum--;
+						if (lastNum - (*it) > SSU2_MAX_NUM_ACNT)
-						it++;
+						{
-					}
+							// NACKs only ranges
-					while (numAcks > SSU2_MAX_NUM_ACNT)
+							if (lastNum > (*it) + SSU2_MAX_NUM_ACNT*(maxNumRanges - numRanges)) break; // too many NACKs
-					{
+							while (lastNum - (*it) > SSU2_MAX_NUM_ACNT)
-						// Acks only ranges
+							{
-						buf[8 + numRanges*2 + 1] = SSU2_MAX_NUM_ACNT; // Acks 255
+								m_Ranges[numRanges*2] = SSU2_MAX_NUM_ACNT; m_Ranges[numRanges*2 + 1] = 0; // NACKs 255, Acks 0
-						numAcks -= SSU2_MAX_NUM_ACNT;
+								lastNum -= SSU2_MAX_NUM_ACNT;
-						numRanges++;
+								numRanges++;
-						numPackets += SSU2_MAX_NUM_ACNT;
+								numPackets += SSU2_MAX_NUM_ACNT;
-						buf[8 + numRanges*2] = 0; // NACKs 0
+							}
-						if (numRanges >= maxNumRanges || numPackets >= SSU2_MAX_NUM_ACK_PACKETS) break;
+						}
-					}
+						// NACKs and Acks ranges
-					if (numAcks > SSU2_MAX_NUM_ACNT) numAcks = SSU2_MAX_NUM_ACNT;
+						m_Ranges[numRanges*2] = lastNum - (*it) - 1; // NACKs
-					buf[8 + numRanges*2 + 1] = (uint8_t)numAcks; // Acks
+						numPackets += m_Ranges[numRanges*2];
-					numPackets += numAcks;
+						lastNum = *it; it++;
-					numRanges++;
+						int numAcks = 1;
-				}
+						while (it != m_OutOfSequencePackets.rend () && lastNum > 0 && *it == lastNum - 1)
-				if (it == m_OutOfSequencePackets.rend () &&
+						{
-					numRanges < maxNumRanges && numPackets < SSU2_MAX_NUM_ACK_PACKETS)
+							numAcks++; lastNum--;
-				{
+							it++;
-					// add range between out-of-sequence and received
+						}
-					int nacks = *m_OutOfSequencePackets.begin () - m_ReceivePacketNum - 1;
+						while (numAcks > SSU2_MAX_NUM_ACNT)
-					if (nacks > 0)
+						{
-					{
+							// Acks only ranges
-						if (nacks > SSU2_MAX_NUM_ACNT) nacks = SSU2_MAX_NUM_ACNT;
+							m_Ranges[numRanges*2 + 1] = SSU2_MAX_NUM_ACNT; // Acks 255
-						buf[8 + numRanges*2] = nacks;
+							numAcks -= SSU2_MAX_NUM_ACNT;
-						buf[8 + numRanges*2 + 1] = std::min ((int)m_ReceivePacketNum + 1, SSU2_MAX_NUM_ACNT);
+							numRanges++;
+							numPackets += SSU2_MAX_NUM_ACNT;
+							m_Ranges[numRanges*2] = 0; // NACKs 0
+							if (numRanges >= maxNumRanges || numPackets >= SSU2_MAX_NUM_ACK_PACKETS) break;
+						}
+						if (numAcks > SSU2_MAX_NUM_ACNT) numAcks = SSU2_MAX_NUM_ACNT;
+						m_Ranges[numRanges*2 + 1] = (uint8_t)numAcks; // Acks
+						numPackets += numAcks;
 						numRanges++;
 					}
+					if (it == m_OutOfSequencePackets.rend () &&
+						numRanges < maxNumRanges && numPackets < SSU2_MAX_NUM_ACK_PACKETS)
+					{
+						// add range between out-of-sequence and received
+						int nacks = *m_OutOfSequencePackets.begin () - m_ReceivePacketNum - 1;
+						if (nacks > 0)
+						{
+							if (nacks > SSU2_MAX_NUM_ACNT) nacks = SSU2_MAX_NUM_ACNT;
+							m_Ranges[numRanges*2] = nacks;
+							m_Ranges[numRanges*2 + 1] = std::min ((int)m_ReceivePacketNum + 1, SSU2_MAX_NUM_ACNT);
+							numRanges++;
+						}
+					}
+					m_NumRanges = numRanges;
 				}	
+				if (m_NumRanges)
+					memcpy (buf + 8, m_Ranges, m_NumRanges*2);
 			}
 		}
 		buf[7] = (uint8_t)acnt; // acnt
-		htobe16buf (buf + 1, 5 + numRanges*2);
+		htobe16buf (buf + 1, 5 + m_NumRanges*2);
-		return 8 + numRanges*2;
+		return 8 + m_NumRanges*2;
 	}
 
 	size_t SSU2Session::CreatePaddingBlock (uint8_t * buf, size_t len, size_t minSize)
 	{
 		if (len < 3 || len < minSize) return 0;
-		size_t paddingSize = m_Server.GetRng ()() & 0x0F; // 0 - 15
+		size_t paddingSize = m_Server.GetRng ()() & 0x1F; // 0 - 31
 		if (paddingSize + 3 > len) paddingSize = len - 3;
 		else if (paddingSize + 3 < minSize) paddingSize = minSize - 3;
 		buf[0] = eSSU2BlkPadding;
@@ -2835,7 +2891,7 @@ namespace transport
 			LogPrint (eLogError, "SSU2: Buffer for RelayResponse signature is too small ", len);
 			return 0;
 		}
-		SignedData s;
+		SignedData<128> s;
 		s.Insert ((const uint8_t *)"RelayAgreementOK", 16); // prologue
 		if (code == eSSU2RelayResponseCodeAccept || code >= 64) // Charlie
 			s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash
@@ -2897,7 +2953,7 @@ namespace transport
 		size_t asz = CreateEndpoint (signedData + 10, 86, boost::asio::ip::udp::endpoint (localAddress->host, localAddress->port));
 		signedData[9] = asz;
 		// signature
-		SignedData s;
+		SignedData<128> s;
 		s.Insert ((const uint8_t *)"PeerTestValidate", 16); // prologue
 		s.Insert (GetRemoteIdentity ()->GetIdentHash (), 32); // bhash
 		s.Insert (signedData, 10 + asz); // ver, nonce, ts, asz, Alice's endpoint
@@ -2961,11 +3017,17 @@ namespace transport
 					}
 					m_OutOfSequencePackets.erase (m_OutOfSequencePackets.begin (), it);
 				}
+				m_NumRanges = 0; // recalculate ranges when create next Ack
 			}
 			m_ReceivePacketNum = packetNum;
 		}
 		else
+		{
+			if (m_NumRanges && (m_OutOfSequencePackets.empty () ||
+				packetNum != (*m_OutOfSequencePackets.rbegin ()) + 1))
+				m_NumRanges = 0; // reset ranges if received packet is not next
 			m_OutOfSequencePackets.insert (packetNum);
+		}	
 		return true;
 	}
 
@@ -2996,38 +3058,67 @@ namespace transport
 
 	void SSU2Session::SendPathResponse (const uint8_t * data, size_t len)
 	{
-		if (len > m_MaxPayloadSize - 3)
+		uint8_t payload[SSU2_MAX_PACKET_SIZE];
+		size_t payloadSize = 0;
+		// datetime block
+		payload[0] = eSSU2BlkDateTime;
+		htobe16buf (payload + 1, 4);
+		htobe32buf (payload + 3, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000);
+		payloadSize += 7;
+		// address block 
+		payloadSize += CreateAddressBlock (payload + payloadSize, m_MaxPayloadSize  - payloadSize, m_RemoteEndpoint);
+		// path response
+		if (payloadSize + len > m_MaxPayloadSize)
 		{
 			LogPrint (eLogWarning, "SSU2: Incorrect data size for path response ", len);
 			return;
 		}	
-		uint8_t payload[SSU2_MAX_PACKET_SIZE];
+		payload[payloadSize] = eSSU2BlkPathResponse;
-		payload[0] = eSSU2BlkPathResponse;
+		htobe16buf (payload + payloadSize + 1, len);
-		htobe16buf (payload + 1, len);
+		memcpy (payload + payloadSize + 3, data, len);
-		memcpy (payload + 3, data, len);
+		payloadSize += len + 3;	
-		size_t payloadSize = len + 3;	
+		// ack block
 		if (payloadSize < m_MaxPayloadSize)
-			payloadSize += CreatePaddingBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize, payloadSize < 8 ? 8 : 0);
+			payloadSize += CreateAckBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize);
+		// padding
+		if (payloadSize < m_MaxPayloadSize)
+			payloadSize += CreatePaddingBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize);
 		SendData (payload, payloadSize);
 	}
 
-	void SSU2Session::SendPathChallenge ()
+	void SSU2Session::SendPathChallenge (const boost::asio::ip::udp::endpoint& to)
 	{
+		AdjustMaxPayloadSize (SSU2_MIN_PACKET_SIZE); // reduce to minimum 
+		m_WindowSize = SSU2_MIN_WINDOW_SIZE; // reduce window to minimum
+		
 		uint8_t payload[SSU2_MAX_PACKET_SIZE];
-		payload[0] = eSSU2BlkPathChallenge;
+		size_t payloadSize = 0;
-		size_t len = m_Server.GetRng ()() % (m_MaxPayloadSize - 3);
+		// datetime block
-		htobe16buf (payload + 1, len);
+		payload[0] = eSSU2BlkDateTime;
-		if (len > 0)
+		htobe16buf (payload + 1, 4);
-		{
+		htobe32buf (payload + 3, (i2p::util::GetMillisecondsSinceEpoch () + 500)/1000);
-			RAND_bytes (payload + 3, len);
+		payloadSize += 7;
-			i2p::data::IdentHash * hash = new i2p::data::IdentHash ();
+		// address block with new address
-			SHA256 (payload + 3, len, *hash);
+		payloadSize += CreateAddressBlock (payload + payloadSize, m_MaxPayloadSize  - payloadSize, to);
-			m_PathChallenge.reset (hash);
+		// path challenge block
-		}
+		payload[payloadSize] = eSSU2BlkPathChallenge;
-		len += 3;
+		uint64_t challenge;
-		if (len < m_MaxPayloadSize)
+		RAND_bytes ((uint8_t *)&challenge, 8);		
-			len += CreatePaddingBlock (payload + len, m_MaxPayloadSize - len, len < 8 ? 8 : 0);
+		htobe16buf (payload + payloadSize + 1, 8); // always 8 bytes
-		SendData (payload, len);
+		htobuf64 (payload + payloadSize + 3, challenge);
+		payloadSize += 11;
+		m_PathChallenge = std::make_unique<std::pair<uint64_t, boost::asio::ip::udp::endpoint> >(challenge, to);	
+		// ack block
+		if (payloadSize < m_MaxPayloadSize)
+			payloadSize += CreateAckBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize);
+		// padding block
+		if (payloadSize < m_MaxPayloadSize)
+			payloadSize += CreatePaddingBlock (payload + payloadSize, m_MaxPayloadSize - payloadSize);
+		// send to new endpoint
+		auto existing = m_RemoteEndpoint;
+		m_RemoteEndpoint = to; // send path challenge to new endpoint
+		SendData (payload, payloadSize);
+		m_RemoteEndpoint = existing; // restore endpoint back until path response received
 	}
 
 	void SSU2Session::CleanUp (uint64_t ts)

libi2pd/SSU2Session.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2022-2024, The PurpleI2P Project
+* Copyright (c) 2022-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -327,7 +327,7 @@ namespace transport
 			void SendQuickAck ();
 			void SendTermination ();
 			void SendPathResponse (const uint8_t * data, size_t len);
-			void SendPathChallenge ();
+			void SendPathChallenge (const boost::asio::ip::udp::endpoint& to);
 
 			void HandleDateTime (const uint8_t * buf, size_t len);
 			void HandleRouterInfo (const uint8_t * buf, size_t len);
@@ -336,7 +336,7 @@ namespace transport
 			virtual void HandleAddress (const uint8_t * buf, size_t len);
 			size_t CreateEndpoint (uint8_t * buf, size_t len, const boost::asio::ip::udp::endpoint& ep);
 			std::shared_ptr<const i2p::data::RouterInfo::Address> FindLocalAddress () const;
-			void AdjustMaxPayloadSize ();
+			void AdjustMaxPayloadSize (size_t maxMtu = SSU2_MAX_PACKET_SIZE);
 			bool GetTestingState () const;
 			void SetTestingState(bool testing) const;
 			std::shared_ptr<const i2p::data::RouterInfo> ExtractRouterInfo (const uint8_t * buf, size_t size);
@@ -394,9 +394,11 @@ namespace transport
 			boost::asio::deadline_timer m_ConnectTimer;
 			SSU2TerminationReason m_TerminationReason;
 			size_t m_MaxPayloadSize;
-			std::unique_ptr<i2p::data::IdentHash> m_PathChallenge;
+			std::unique_ptr<std::pair<uint64_t, boost::asio::ip::udp::endpoint> > m_PathChallenge;
 			std::unordered_map<uint32_t, uint32_t> m_ReceivedI2NPMsgIDs; // msgID -> timestamp in seconds
 			uint64_t m_LastResendTime, m_LastResendAttemptTime; // in milliseconds
+			int m_NumRanges;
+			uint8_t m_Ranges[SSU2_MAX_NUM_ACK_RANGES*2]; // ranges sent with previous Ack if any
 	};
 	
 	inline uint64_t CreateHeaderMask (const uint8_t * kh, const uint8_t * nonce)

libi2pd/Signature.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -7,6 +7,10 @@
 */
 
 #include <memory>
+#include <openssl/evp.h>
+#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
+#include <openssl/core_names.h>
+#endif
 #include "Log.h"
 #include "Signature.h"
 
@@ -14,6 +18,163 @@ namespace i2p
 {
 namespace crypto
 {
+#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
+	DSAVerifier::DSAVerifier ():
+		m_PublicKey (nullptr)
+	{
+	}
+
+	DSAVerifier::~DSAVerifier ()
+	{
+		if (m_PublicKey)
+			EVP_PKEY_free (m_PublicKey);
+	}
+
+	void DSAVerifier::SetPublicKey (const uint8_t * signingKey)
+	{
+		if (m_PublicKey)
+			EVP_PKEY_free (m_PublicKey);
+		BIGNUM * pub = BN_bin2bn (signingKey, DSA_PUBLIC_KEY_LENGTH, NULL);
+		m_PublicKey = CreateDSA (pub);
+		BN_free (pub);
+	}
+	
+	bool DSAVerifier::Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
+	{
+		// calculate SHA1 digest
+		uint8_t digest[20], sign[48];
+		SHA1 (buf, len, digest);
+		// signature
+		DSA_SIG * sig = DSA_SIG_new();
+		DSA_SIG_set0 (sig, BN_bin2bn (signature, DSA_SIGNATURE_LENGTH/2, NULL), BN_bin2bn (signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2, NULL));
+		// to DER format
+		uint8_t * s = sign;
+		auto l = i2d_DSA_SIG (sig, &s);
+		DSA_SIG_free(sig);
+		// verify
+		auto ctx = EVP_PKEY_CTX_new (m_PublicKey, NULL);
+        EVP_PKEY_verify_init(ctx);
+        EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha1());
+        bool ret = EVP_PKEY_verify(ctx, sign, l, digest, 20);
+		EVP_PKEY_CTX_free(ctx);
+		return ret;
+	}
+
+	DSASigner::DSASigner (const uint8_t * signingPrivateKey, const uint8_t * signingPublicKey)
+	{
+		BIGNUM * priv = BN_bin2bn (signingPrivateKey, DSA_PRIVATE_KEY_LENGTH, NULL);
+		m_PrivateKey = CreateDSA (nullptr, priv);
+		BN_free (priv);
+	}
+
+	DSASigner::~DSASigner ()
+	{
+		if (m_PrivateKey)
+			EVP_PKEY_free (m_PrivateKey);
+	}
+
+	void DSASigner::Sign (const uint8_t * buf, int len, uint8_t * signature) const
+	{
+		uint8_t digest[20], sign[48];
+		SHA1 (buf, len, digest);
+		auto ctx = EVP_PKEY_CTX_new (m_PrivateKey, NULL);
+        EVP_PKEY_sign_init(ctx);
+        EVP_PKEY_CTX_set_signature_md(ctx, EVP_sha1());
+		size_t l = 48;
+        EVP_PKEY_sign(ctx, sign, &l, digest, 20);
+		const uint8_t * s1 = sign;
+    	DSA_SIG * sig = d2i_DSA_SIG (NULL, &s1, l);
+		const BIGNUM * r, * s;
+		DSA_SIG_get0 (sig, &r, &s);
+		bn2buf (r, signature, DSA_SIGNATURE_LENGTH/2);
+		bn2buf (s, signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2);
+		DSA_SIG_free(sig);
+		EVP_PKEY_CTX_free(ctx);
+	}
+	
+	void CreateDSARandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
+	{
+		EVP_PKEY * paramskey = CreateDSA();
+		EVP_PKEY_CTX * ctx = EVP_PKEY_CTX_new_from_pkey(NULL, paramskey, NULL);
+		EVP_PKEY_keygen_init(ctx);
+		EVP_PKEY * pkey = nullptr;
+		EVP_PKEY_keygen(ctx, &pkey);
+		BIGNUM * pub = NULL, * priv = NULL;
+		EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_PUB_KEY, &pub);
+		bn2buf (pub, signingPublicKey, DSA_PUBLIC_KEY_LENGTH);
+		EVP_PKEY_get_bn_param(pkey, OSSL_PKEY_PARAM_PRIV_KEY, &priv);
+		bn2buf (priv, signingPrivateKey, DSA_PRIVATE_KEY_LENGTH);
+		BN_free (pub); BN_free (priv);
+		EVP_PKEY_free (pkey);
+		EVP_PKEY_free (paramskey);
+		EVP_PKEY_CTX_free (ctx);
+	}	
+#else	
+	
+	DSAVerifier::DSAVerifier ()
+	{
+		m_PublicKey = CreateDSA ();
+	}
+
+	DSAVerifier::~DSAVerifier ()
+	{
+		DSA_free (m_PublicKey);
+	}
+
+	void DSAVerifier::SetPublicKey (const uint8_t * signingKey)
+	{
+		DSA_set0_key (m_PublicKey, BN_bin2bn (signingKey, DSA_PUBLIC_KEY_LENGTH, NULL), NULL);
+	}
+	
+	bool DSAVerifier::Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
+	{
+		// calculate SHA1 digest
+		uint8_t digest[20];
+		SHA1 (buf, len, digest);
+		// signature
+		DSA_SIG * sig = DSA_SIG_new();
+		DSA_SIG_set0 (sig, BN_bin2bn (signature, DSA_SIGNATURE_LENGTH/2, NULL), BN_bin2bn (signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2, NULL));
+		// DSA verification
+		int ret = DSA_do_verify (digest, 20, sig, m_PublicKey);
+		DSA_SIG_free(sig);
+		return ret;
+	}
+
+	DSASigner::DSASigner (const uint8_t * signingPrivateKey, const uint8_t * signingPublicKey)
+	{
+		m_PrivateKey = CreateDSA ();
+		DSA_set0_key (m_PrivateKey, BN_bin2bn (signingPublicKey, DSA_PUBLIC_KEY_LENGTH, NULL), BN_bin2bn (signingPrivateKey, DSA_PRIVATE_KEY_LENGTH, NULL));
+	}
+
+	DSASigner::~DSASigner ()
+	{
+		DSA_free (m_PrivateKey);
+	}
+
+	void DSASigner::Sign (const uint8_t * buf, int len, uint8_t * signature) const
+	{
+		uint8_t digest[20];
+		SHA1 (buf, len, digest);
+		DSA_SIG * sig = DSA_do_sign (digest, 20, m_PrivateKey);
+		const BIGNUM * r, * s;
+		DSA_SIG_get0 (sig, &r, &s);
+		bn2buf (r, signature, DSA_SIGNATURE_LENGTH/2);
+		bn2buf (s, signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2);
+		DSA_SIG_free(sig);
+	}
+
+	void CreateDSARandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
+	{
+		DSA * dsa = CreateDSA ();
+		DSA_generate_key (dsa);
+		const BIGNUM * pub_key, * priv_key;
+		DSA_get0_key(dsa, &pub_key, &priv_key);
+		bn2buf (priv_key, signingPrivateKey, DSA_PRIVATE_KEY_LENGTH);
+		bn2buf (pub_key, signingPublicKey, DSA_PUBLIC_KEY_LENGTH);
+		DSA_free (dsa);
+	}
+#endif	
+	
 #if OPENSSL_EDDSA
 	EDDSA25519Verifier::EDDSA25519Verifier ():
 		m_Pkey (nullptr)
@@ -149,5 +310,178 @@ namespace crypto
 			LogPrint (eLogError, "EdDSA signing key is not set");
 	}
 #endif
+
+#if (OPENSSL_VERSION_NUMBER >= 0x030000000)
+	static const OSSL_PARAM EDDSA25519phParams[] =
+	{
+		OSSL_PARAM_utf8_string ("instance", (char *)"Ed25519ph", 9),
+		OSSL_PARAM_END
+	};
+		
+	bool EDDSA25519phVerifier::Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
+	{
+		auto pkey = GetPkey ();
+		if (pkey)
+		{	
+			uint8_t digest[64];
+			SHA512 (buf, len, digest);
+			EVP_MD_CTX * ctx = EVP_MD_CTX_create ();
+			EVP_DigestVerifyInit_ex (ctx, NULL, NULL, NULL, NULL, pkey, EDDSA25519phParams);
+			auto ret = EVP_DigestVerify (ctx, signature, 64, digest, 64);
+			EVP_MD_CTX_destroy (ctx);	
+			return ret;	
+		}	
+		else
+			LogPrint (eLogError, "EdDSA verification key is not set");
+		return false;
+	}
+
+	EDDSA25519phSigner::EDDSA25519phSigner (const uint8_t * signingPrivateKey): 
+		EDDSA25519Signer (signingPrivateKey)
+	{		
+	}
+		
+	void EDDSA25519phSigner::Sign (const uint8_t * buf, int len, uint8_t * signature) const
+	{
+		auto pkey = GetPkey ();
+		if (pkey)
+		{	
+			uint8_t digest[64];
+			SHA512 (buf, len, digest);
+			EVP_MD_CTX * ctx = EVP_MD_CTX_create ();
+			size_t l = 64;
+			uint8_t sig[64];
+			EVP_DigestSignInit_ex (ctx, NULL, NULL, NULL, NULL, pkey, EDDSA25519phParams);
+			if (!EVP_DigestSign (ctx, sig, &l, digest, 64))
+				LogPrint (eLogError, "EdDSA signing failed");
+			memcpy (signature, sig, 64);
+			EVP_MD_CTX_destroy (ctx);
+		}
+		else
+			LogPrint (eLogError, "EdDSA signing key is not set");
+	}		
+#endif	
+		
+#if OPENSSL_PQ
+		
+	MLDSA44Verifier::MLDSA44Verifier ():
+		m_Pkey (nullptr)
+	{
+	}
+
+	MLDSA44Verifier::~MLDSA44Verifier ()
+	{
+		EVP_PKEY_free (m_Pkey);
+	}
+
+	void MLDSA44Verifier::SetPublicKey (const uint8_t * signingKey)
+	{
+		if (m_Pkey) 
+		{ 
+			EVP_PKEY_free (m_Pkey);
+			m_Pkey = nullptr;
+		}	
+		OSSL_PARAM params[] =
+		{
+			OSSL_PARAM_octet_string (OSSL_PKEY_PARAM_PUB_KEY, (uint8_t *)signingKey, GetPublicKeyLen ()),
+			OSSL_PARAM_END
+		};		
+		EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new_from_name (NULL, "ML-DSA-44", NULL);
+		if (ctx)
+		{
+			EVP_PKEY_fromdata_init (ctx);
+			EVP_PKEY_fromdata (ctx, &m_Pkey, OSSL_KEYMGMT_SELECT_PUBLIC_KEY, params);
+			EVP_PKEY_CTX_free (ctx);
+		}
+		else
+			LogPrint (eLogError, "MLDSA44 can't create PKEY context");
+	}
+
+	bool MLDSA44Verifier::Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
+	{
+		bool ret = false;
+		if (m_Pkey)
+		{	
+			EVP_PKEY_CTX * vctx = EVP_PKEY_CTX_new_from_pkey (NULL, m_Pkey, NULL);
+			if (vctx)
+			{
+				EVP_SIGNATURE * sig = EVP_SIGNATURE_fetch (NULL, "ML-DSA-44", NULL);
+				if (sig)
+				{
+					int encode = 1;
+					OSSL_PARAM params[] =
+					{
+						OSSL_PARAM_int(OSSL_SIGNATURE_PARAM_MESSAGE_ENCODING, &encode),
+						OSSL_PARAM_END
+					};		
+					EVP_PKEY_verify_message_init (vctx, sig, params);
+					ret = EVP_PKEY_verify (vctx, signature, GetSignatureLen (), buf, len);
+					EVP_SIGNATURE_free (sig);
+				}	
+				EVP_PKEY_CTX_free (vctx);
+			}	
+			else
+				LogPrint (eLogError, "MLDSA44 can't obtain context from PKEY");
+		}	
+		else
+			LogPrint (eLogError, "MLDSA44 verification key is not set");
+		return ret;
+	}
+
+	MLDSA44Signer::MLDSA44Signer (const uint8_t * signingPrivateKey):
+		m_Pkey (nullptr)
+	{
+		OSSL_PARAM params[] =
+		{
+			OSSL_PARAM_octet_string (OSSL_PKEY_PARAM_PRIV_KEY, (uint8_t *)signingPrivateKey, MLDSA44_PRIVATE_KEY_LENGTH),
+			OSSL_PARAM_END
+		};		
+		EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new_from_name (NULL, "ML-DSA-44", NULL);
+		if (ctx)
+		{
+			EVP_PKEY_fromdata_init (ctx);
+			EVP_PKEY_fromdata (ctx, &m_Pkey, OSSL_KEYMGMT_SELECT_PRIVATE_KEY, params);
+			EVP_PKEY_CTX_free (ctx);
+		}
+		else
+			LogPrint (eLogError, "MLDSA44 can't create PKEY context");
+	}
+
+	MLDSA44Signer::~MLDSA44Signer ()
+	{
+		if (m_Pkey) EVP_PKEY_free (m_Pkey);
+	}
+
+	void MLDSA44Signer::Sign (const uint8_t * buf, int len, uint8_t * signature) const
+	{
+		if (m_Pkey)
+		{	
+			EVP_PKEY_CTX * sctx = EVP_PKEY_CTX_new_from_pkey (NULL, m_Pkey, NULL);
+			if (sctx)
+			{
+				EVP_SIGNATURE * sig = EVP_SIGNATURE_fetch (NULL, "ML-DSA-44", NULL);
+				if (sig)
+				{
+					int encode = 1;
+					OSSL_PARAM params[] =
+					{
+						OSSL_PARAM_int(OSSL_SIGNATURE_PARAM_MESSAGE_ENCODING, &encode),
+						OSSL_PARAM_END
+					};		
+					EVP_PKEY_sign_message_init (sctx, sig, params);
+					size_t siglen = MLDSA44_SIGNATURE_LENGTH;
+					EVP_PKEY_sign (sctx, signature, &siglen, buf, len);
+					EVP_SIGNATURE_free (sig);
+				}	
+				EVP_PKEY_CTX_free (sctx);
+			}	
+			else
+				LogPrint (eLogError, "MLDSA44 can't obtain context from PKEY");
+		}	
+		else
+			LogPrint (eLogError, "MLDSA44 signing key is not set");
+	}	
+		
+#endif		
 }
 }

libi2pd/Signature.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -43,6 +43,7 @@ namespace crypto
 			virtual void Sign (const uint8_t * buf, int len, uint8_t * signature) const = 0;
 	};
 
+	// DSA
 	const size_t DSA_PUBLIC_KEY_LENGTH = 128;
 	const size_t DSA_SIGNATURE_LENGTH = 40;
 	const size_t DSA_PRIVATE_KEY_LENGTH = DSA_SIGNATURE_LENGTH/2;
@@ -50,87 +51,47 @@ namespace crypto
 	{
 		public:
 			
-			DSAVerifier ()
+			DSAVerifier ();
-			{
+			~DSAVerifier ();
-				m_PublicKey = CreateDSA ();
-			}
 
-			void SetPublicKey (const uint8_t * signingKey)
+			// implements Verifier
-			{
+			void SetPublicKey (const uint8_t * signingKey) override;
-				DSA_set0_key (m_PublicKey, BN_bin2bn (signingKey, DSA_PUBLIC_KEY_LENGTH, NULL), NULL);
+			bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const override;
-			}
+			size_t GetPublicKeyLen () const override { return DSA_PUBLIC_KEY_LENGTH; };
-
+			size_t GetSignatureLen () const override { return DSA_SIGNATURE_LENGTH; };
-			~DSAVerifier ()
-			{
-				DSA_free (m_PublicKey);
-			}
-
-			bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const
-			{
-				// calculate SHA1 digest
-				uint8_t digest[20];
-				SHA1 (buf, len, digest);
-				// signature
-				DSA_SIG * sig = DSA_SIG_new();
-				DSA_SIG_set0 (sig, BN_bin2bn (signature, DSA_SIGNATURE_LENGTH/2, NULL), BN_bin2bn (signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2, NULL));
-				// DSA verification
-				int ret = DSA_do_verify (digest, 20, sig, m_PublicKey);
-				DSA_SIG_free(sig);
-				return ret;
-			}
-
-			size_t GetPublicKeyLen () const { return DSA_PUBLIC_KEY_LENGTH; };
-			size_t GetSignatureLen () const { return DSA_SIGNATURE_LENGTH; };
 			
 		private:
 
+#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
+			EVP_PKEY * m_PublicKey;
+#else			
 			DSA * m_PublicKey;
+#endif			
 	};
 
 	class DSASigner: public Signer
 	{
 		public:
 
-			DSASigner (const uint8_t * signingPrivateKey, const uint8_t * signingPublicKey)
+			DSASigner (const uint8_t * signingPrivateKey, const uint8_t * signingPublicKey);
 			// openssl 1.1 always requires DSA public key even for signing
-			{
+			~DSASigner ();
-				m_PrivateKey = CreateDSA ();
-				DSA_set0_key (m_PrivateKey, BN_bin2bn (signingPublicKey, DSA_PUBLIC_KEY_LENGTH, NULL), BN_bin2bn (signingPrivateKey, DSA_PRIVATE_KEY_LENGTH, NULL));
-			}
 
-			~DSASigner ()
+			// implements Signer
-			{
+			void Sign (const uint8_t * buf, int len, uint8_t * signature) const override;
-				DSA_free (m_PrivateKey);
-			}
-
-			void Sign (const uint8_t * buf, int len, uint8_t * signature) const
-			{
-				uint8_t digest[20];
-				SHA1 (buf, len, digest);
-				DSA_SIG * sig = DSA_do_sign (digest, 20, m_PrivateKey);
-				const BIGNUM * r, * s;
-				DSA_SIG_get0 (sig, &r, &s);
-				bn2buf (r, signature, DSA_SIGNATURE_LENGTH/2);
-				bn2buf (s, signature + DSA_SIGNATURE_LENGTH/2, DSA_SIGNATURE_LENGTH/2);
-				DSA_SIG_free(sig);
-			}
 
 		private:
 
+#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
+			EVP_PKEY * m_PrivateKey;
+#else
 			DSA * m_PrivateKey;
+#endif			
 	};
 
-	inline void CreateDSARandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
+	void CreateDSARandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey);
-	{
-		DSA * dsa = CreateDSA ();
-		DSA_generate_key (dsa);
-		const BIGNUM * pub_key, * priv_key;
-		DSA_get0_key(dsa, &pub_key, &priv_key);
-		bn2buf (priv_key, signingPrivateKey, DSA_PRIVATE_KEY_LENGTH);
-		bn2buf (pub_key, signingPublicKey, DSA_PUBLIC_KEY_LENGTH);
-		DSA_free (dsa);
-	}
 
+	// ECDSA	
 	struct SHA256Hash
 	{
 		static void CalculateHash (const uint8_t * buf, size_t len, uint8_t * digest)
@@ -161,7 +122,6 @@ namespace crypto
 		enum { hashLen = 64 };
 	};
 
-	// EcDSA
 	template<typename Hash, int curve, size_t keyLen>
 	class ECDSAVerifier: public Verifier
 	{
@@ -304,13 +264,27 @@ namespace crypto
 		private:
 
 #if OPENSSL_EDDSA	
+			
 			EVP_PKEY * m_Pkey;
+			
+		protected:
+
+			EVP_PKEY * GetPkey () const { return m_Pkey; };
 #else
 			EDDSAPoint m_PublicKey;
 			uint8_t m_PublicKeyEncoded[EDDSA25519_PUBLIC_KEY_LENGTH];
 #endif
 	};
 
+#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
+	class EDDSA25519phVerifier: public EDDSA25519Verifier
+	{
+		public:
+
+			bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const;
+	};
+#endif	
+	
 	class EDDSA25519SignerCompat: public Signer
 	{
 		public:
@@ -339,6 +313,10 @@ namespace crypto
 
 			void Sign (const uint8_t * buf, int len, uint8_t * signature) const;
 
+		protected:
+
+			EVP_PKEY * GetPkey () const { return m_Pkey; };
+			
 		private:
 
 			EVP_PKEY * m_Pkey;
@@ -348,6 +326,18 @@ namespace crypto
 
 	typedef EDDSA25519SignerCompat EDDSA25519Signer;
 
+#endif
+
+#if (OPENSSL_VERSION_NUMBER >= 0x030000000) // since 3.0.0
+	class EDDSA25519phSigner: public EDDSA25519Signer
+	{
+		public:
+
+			EDDSA25519phSigner (const uint8_t * signingPrivateKey);
+		
+			void Sign (const uint8_t * buf, int len, uint8_t * signature) const;
+	};
+	
 #endif	
 	
 	inline void CreateEDDSA25519RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
@@ -530,6 +520,57 @@ namespace crypto
 		RedDSA25519Signer signer (signingPrivateKey);
 		memcpy (signingPublicKey, signer.GetPublicKey (), EDDSA25519_PUBLIC_KEY_LENGTH);
 	}
+	
+#if OPENSSL_PQ
+#include <openssl/core_names.h>
+	
+	// Post-Quantum
+	const size_t MLDSA44_PUBLIC_KEY_LENGTH = 1312;
+	const size_t MLDSA44_SIGNATURE_LENGTH = 2420;
+	const size_t MLDSA44_PRIVATE_KEY_LENGTH = 2560;
+	class MLDSA44Verifier: public Verifier
+	{
+		public:
+
+			MLDSA44Verifier ();
+			void SetPublicKey (const uint8_t * signingKey);
+			~MLDSA44Verifier ();
+
+			bool Verify (const uint8_t * buf, size_t len, const uint8_t * signature) const;
+
+			size_t GetPublicKeyLen () const { return MLDSA44_PUBLIC_KEY_LENGTH; };
+			size_t GetSignatureLen () const { return MLDSA44_SIGNATURE_LENGTH; };
+			size_t GetPrivateKeyLen () const { return MLDSA44_PRIVATE_KEY_LENGTH; };
+
+		private:
+			
+			EVP_PKEY * m_Pkey;
+	};
+
+	class MLDSA44Signer: public Signer
+	{
+		public:
+
+			MLDSA44Signer (const uint8_t * signingPrivateKey);
+			~MLDSA44Signer ();
+
+			void Sign (const uint8_t * buf, int len, uint8_t * signature) const;
+			
+		private:
+
+			EVP_PKEY * m_Pkey;
+	};
+	
+	inline void CreateMLDSA44RandomKeys (uint8_t * signingPrivateKey, uint8_t * signingPublicKey)
+	{
+		EVP_PKEY * pkey = EVP_PKEY_Q_keygen (NULL, NULL, "ML-DSA-44");
+		size_t len = MLDSA44_PUBLIC_KEY_LENGTH;
+        EVP_PKEY_get_octet_string_param (pkey, OSSL_PKEY_PARAM_PUB_KEY, signingPublicKey, MLDSA44_PUBLIC_KEY_LENGTH, &len);
+		len = MLDSA44_PRIVATE_KEY_LENGTH;
+		EVP_PKEY_get_octet_string_param (pkey, OSSL_PKEY_PARAM_PRIV_KEY, signingPrivateKey, MLDSA44_PRIVATE_KEY_LENGTH, &len);
+		EVP_PKEY_free (pkey);
+	}	
+#endif	
 }
 }
 

libi2pd/Streaming.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -19,39 +19,55 @@ namespace i2p
 {
 namespace stream
 {
-	void SendBufferQueue::Add (std::shared_ptr<SendBuffer> buf)
+	void SendBufferQueue::Add (std::shared_ptr<SendBuffer>&& buf)
 	{
 		if (buf)
 		{
-			m_Buffers.push_back (buf);
 			m_Size += buf->len;
+			m_Buffers.push_back (std::move (buf));
 		}
 	}
 
 	size_t SendBufferQueue::Get (uint8_t * buf, size_t len)
 	{
+		if (!m_Size) return 0;
 		size_t offset = 0;
-		while (!m_Buffers.empty () && offset < len)
+		if (len >= m_Size)
 		{
-			auto nextBuffer = m_Buffers.front ();
+			for (auto& it: m_Buffers)
-			auto rem = nextBuffer->GetRemainingSize ();
-			if (offset + rem <= len)
 			{
-				// whole buffer
+				auto rem = it->GetRemainingSize ();
-				memcpy (buf + offset, nextBuffer->GetRemaningBuffer (), rem);
+				memcpy (buf + offset, it->GetRemaningBuffer (), rem);
 				offset += rem;
-				m_Buffers.pop_front (); // delete it
-			}
-			else
-			{
-				// partially
-				rem = len - offset;
-				memcpy (buf + offset, nextBuffer->GetRemaningBuffer (), rem);
-				nextBuffer->offset += rem;
-				offset = len; // break
 			}
+			m_Buffers.clear ();
+			m_Size = 0;
+			return offset;
+		}	
+		else
+		{	
+			while (!m_Buffers.empty () && offset < len)
+			{
+				auto nextBuffer = m_Buffers.front ();
+				auto rem = nextBuffer->GetRemainingSize ();
+				if (offset + rem <= len)
+				{
+					// whole buffer
+					memcpy (buf + offset, nextBuffer->GetRemaningBuffer (), rem);
+					offset += rem;
+					m_Buffers.pop_front (); // delete it
+				}
+				else
+				{
+					// partially
+					rem = len - offset;
+					memcpy (buf + offset, nextBuffer->GetRemaningBuffer (), rem);
+					nextBuffer->offset += rem;
+					offset = len; // break
+				}
+			}
+			m_Size -= offset;
 		}	
-		m_Size -= offset;
 		return offset;
 	}
 
@@ -59,7 +75,7 @@ namespace stream
 	{
 		if (!m_Buffers.empty ())
 		{
-			for (auto it: m_Buffers)
+			for (auto& it: m_Buffers)
 				it->Cancel ();
 			m_Buffers.clear ();
 			m_Size = 0;
@@ -80,7 +96,7 @@ namespace stream
 		m_WindowDropTargetSize (0), m_WindowIncCounter (0), m_RTO (INITIAL_RTO),
 		m_AckDelay (local.GetOwner ()->GetStreamingAckDelay ()), m_PrevRTTSample (INITIAL_RTT), m_WindowSizeTail (0), 
 		m_Jitter (0), m_MinPacingTime (0),
-		m_PacingTime (INITIAL_PACING_TIME), m_PacingTimeRem (0), m_LastSendTime (0), m_LastACKRecieveTime (0), m_ACKRecieveInterval (local.GetOwner ()->GetStreamingAckDelay ()), m_RemoteLeaseChangeTime (0),
+		m_PacingTime (INITIAL_PACING_TIME), m_PacingTimeRem (0), m_LastSendTime (0), m_LastACKRecieveTime (0), m_ACKRecieveInterval (local.GetOwner ()->GetStreamingAckDelay ()), m_RemoteLeaseChangeTime (0), m_LastWindowIncTime (0),
 		m_LastACKSendTime (0), m_PacketACKInterval (1), m_PacketACKIntervalRem (0), // for limit inbound speed
 		m_NumResendAttempts (0), m_NumPacketsToSend (0), m_MTU (STREAMING_MTU)
 	{
@@ -107,7 +123,7 @@ namespace stream
 		m_WindowSize (INITIAL_WINDOW_SIZE), m_LastWindowDropSize  (0), m_WindowDropTargetSize (0), m_WindowIncCounter (0), 
 		m_RTO (INITIAL_RTO), m_AckDelay (local.GetOwner ()->GetStreamingAckDelay ()),
 		m_PrevRTTSample (INITIAL_RTT), m_WindowSizeTail (0), m_Jitter (0), m_MinPacingTime (0),
-		m_PacingTime (INITIAL_PACING_TIME), m_PacingTimeRem (0), m_LastSendTime (0), m_LastACKRecieveTime (0), m_ACKRecieveInterval (local.GetOwner ()->GetStreamingAckDelay ()), m_RemoteLeaseChangeTime (0),
+		m_PacingTime (INITIAL_PACING_TIME), m_PacingTimeRem (0), m_LastSendTime (0), m_LastACKRecieveTime (0), m_ACKRecieveInterval (local.GetOwner ()->GetStreamingAckDelay ()), m_RemoteLeaseChangeTime (0), m_LastWindowIncTime (0),
 		m_LastACKSendTime (0), m_PacketACKInterval (1), m_PacketACKIntervalRem (0), // for limit inbound speed
 		m_NumResendAttempts (0), m_NumPacketsToSend (0), m_MTU (STREAMING_MTU)
 	{
@@ -613,10 +629,8 @@ namespace stream
 			if (wasInitial)
 				ScheduleResend ();
 		}
-		if (m_IsClientChoked && ackThrough > m_DropWindowDelaySequenceNumber)
+		if (m_IsClientChoked && ackThrough >= m_DropWindowDelaySequenceNumber)
-		{
 			m_IsClientChoked = false;
-		}
 		if (m_IsWinDropped && ackThrough > m_DropWindowDelaySequenceNumber)
 		{
 			m_IsFirstRttSample = true;
@@ -719,10 +733,10 @@ namespace stream
 		else if (handler)
 			handler(boost::system::error_code ());
 		auto s = shared_from_this ();
-		boost::asio::post (m_Service, [s, buffer]()
+		boost::asio::post (m_Service, [s, buffer = std::move(buffer)]() mutable
 			{
 				if (buffer)
-					s->m_SendBuffer.Add (buffer);
+					s->m_SendBuffer.Add (std::move(buffer));
 				s->SendBuffer ();
 			});	
 	}
@@ -1297,8 +1311,14 @@ namespace stream
 					m_NumPacketsToSend = 1; m_PacingTimeRem = 0;
 				}	
 				m_IsSendTime = true;
-				if (m_WindowIncCounter && (m_WindowSize < MAX_WINDOW_SIZE || m_WindowDropTargetSize) && !m_SendBuffer.IsEmpty () && m_PacingTime > m_MinPacingTime)
+				if (m_WindowIncCounter && (m_WindowSize < MAX_WINDOW_SIZE || m_WindowDropTargetSize) && !m_SendBuffer.IsEmpty () && m_PacingTime > m_MinPacingTime && m_RTT <= m_SlowRTT)
 				{
+					float winSize = m_WindowSize;
+					if (m_WindowDropTargetSize)
+						winSize = m_WindowDropTargetSize;
+					float maxWinSize = MAX_WINDOW_SIZE;
+					if (m_LastWindowIncTime)
+						maxWinSize = (ts - m_LastWindowIncTime) / (m_RTT / MAX_WINDOW_SIZE_INC_PER_RTT) + winSize;
 					for (int i = 0; i < m_NumPacketsToSend; i++)
 					{
 						if (m_WindowIncCounter)
@@ -1307,12 +1327,17 @@ namespace stream
 							{
 								if (m_LastWindowDropSize && (m_LastWindowDropSize >= m_WindowDropTargetSize))
 									m_WindowDropTargetSize += 1 - (1 / ((m_LastWindowDropSize + PREV_SPEED_KEEP_TIME_COEFF) / m_WindowDropTargetSize)); // some magic here
-								else if (m_LastWindowDropSize && (m_LastWindowDropSize < m_WindowSize))
+								else if (m_LastWindowDropSize && (m_LastWindowDropSize < m_WindowDropTargetSize))
 									m_WindowDropTargetSize += (m_WindowDropTargetSize - (m_LastWindowDropSize - PREV_SPEED_KEEP_TIME_COEFF)) / m_WindowDropTargetSize; // some magic here
 								else
 									m_WindowDropTargetSize += (m_WindowDropTargetSize - (1 - PREV_SPEED_KEEP_TIME_COEFF)) / m_WindowDropTargetSize;
 								if (m_WindowDropTargetSize > MAX_WINDOW_SIZE) m_WindowDropTargetSize = MAX_WINDOW_SIZE;
 								m_WindowIncCounter--;
+								if (m_WindowDropTargetSize >= maxWinSize)
+								{
+									m_WindowDropTargetSize = maxWinSize;
+									break;
+								}
 							}
 							else
 							{
@@ -1324,11 +1349,17 @@ namespace stream
 									m_WindowSize += (m_WindowSize - (1 - PREV_SPEED_KEEP_TIME_COEFF)) / m_WindowSize;
 								if (m_WindowSize > MAX_WINDOW_SIZE) m_WindowSize = MAX_WINDOW_SIZE;
 								m_WindowIncCounter--;
+								if (m_WindowSize >= maxWinSize)
+								{
+									m_WindowSize = maxWinSize;
+									break;
+								}
 							}
 						}
 						else
 							break;
 					}
+					m_LastWindowIncTime = ts;
 					UpdatePacingTime ();
 				}
 				else if (m_WindowIncCounter && m_WindowSize == MAX_WINDOW_SIZE && !m_SendBuffer.IsEmpty () && m_PacingTime > m_MinPacingTime)
@@ -1646,14 +1677,22 @@ namespace stream
 
 	void Stream::ProcessWindowDrop ()
 	{
-		if (m_WindowSize > m_LastWindowDropSize)
+		if (m_WindowDropTargetSize)
-		{
+			m_WindowDropTargetSize = (m_WindowDropTargetSize / 2) * 0.75; // congestion window size and -25% to drain queue
-			m_LastWindowDropSize = (m_LastWindowDropSize + m_WindowSize + m_WindowSizeTail) / 2;
-			if (m_LastWindowDropSize > MAX_WINDOW_SIZE) m_LastWindowDropSize = MAX_WINDOW_SIZE;
-		}
 		else
-			m_LastWindowDropSize = m_WindowSize;
+		{
-		m_WindowDropTargetSize = m_LastWindowDropSize - (m_LastWindowDropSize / 4); // -25%;
+			if (m_WindowSize < m_LastWindowDropSize)
+			{
+				m_LastWindowDropSize = std::max ((m_WindowSize - MAX_WINDOW_SIZE_INC_PER_RTT), (m_WindowSize - (m_LastWindowDropSize - m_WindowSize)));
+				if (m_LastWindowDropSize < MIN_WINDOW_SIZE) m_LastWindowDropSize = MIN_WINDOW_SIZE;
+			}
+			else
+			{
+				m_LastWindowDropSize = std::max ((m_WindowSize - MAX_WINDOW_SIZE_INC_PER_RTT), ((m_LastWindowDropSize + m_WindowSize + m_WindowSizeTail) / 2));
+				if (m_LastWindowDropSize > MAX_WINDOW_SIZE) m_LastWindowDropSize = MAX_WINDOW_SIZE;
+			}
+			m_WindowDropTargetSize = m_LastWindowDropSize * 0.75; // -25% to drain queue
+		}
 		if (m_WindowDropTargetSize < MIN_WINDOW_SIZE)
 			m_WindowDropTargetSize = MIN_WINDOW_SIZE;
 		m_WindowIncCounter = 0; // disable window growth

libi2pd/Streaming.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -57,6 +57,7 @@ namespace stream
 	const int INITIAL_WINDOW_SIZE = 10;
 	const int MIN_WINDOW_SIZE = 3;
 	const int MAX_WINDOW_SIZE = 512;
+	const int MAX_WINDOW_SIZE_INC_PER_RTT = 16;
 	const double RTT_EWMA_ALPHA = 0.25;
 	const double SLOWRTT_EWMA_ALPHA = 0.05;
 	const double PREV_SPEED_KEEP_TIME_COEFF = 0.35; // 0.1 - 1 // how long will the window size stay around the previous drop level, less is longer
@@ -149,7 +150,7 @@ namespace stream
 			SendBufferQueue (): m_Size (0) {};
 			~SendBufferQueue () { CleanUp (); };
 
-			void Add (std::shared_ptr<SendBuffer> buf);
+			void Add (std::shared_ptr<SendBuffer>&& buf);
 			size_t Get (uint8_t * buf, size_t len);
 			size_t GetSize () const { return m_Size; };
 			bool IsEmpty () const { return m_Buffers.empty (); };
@@ -299,7 +300,7 @@ namespace stream
 			int m_WindowIncCounter, m_RTO, m_AckDelay, m_PrevRTTSample, m_WindowSizeTail;
 			double m_Jitter;
 			uint64_t m_MinPacingTime, m_PacingTime, m_PacingTimeRem, // microseconds
-				m_LastSendTime, m_LastACKRecieveTime, m_ACKRecieveInterval, m_RemoteLeaseChangeTime;	// milliseconds
+				m_LastSendTime, m_LastACKRecieveTime, m_ACKRecieveInterval, m_RemoteLeaseChangeTime, m_LastWindowIncTime;	// milliseconds
 			uint64_t m_LastACKSendTime, m_PacketACKInterval, m_PacketACKIntervalRem; // for limit inbound speed
 			int m_NumResendAttempts, m_NumPacketsToSend;
 			size_t m_MTU;

libi2pd/Tag.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2023, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -12,10 +12,14 @@
 #include <boost/static_assert.hpp>
 #include <string.h>
 #include <openssl/rand.h>
+#include <string>
+#include <string_view>
 #include "Base.h"
 
-namespace i2p {
+namespace i2p 
-namespace data {
+{
+namespace data 
+{
 	template<size_t sz>
 	class Tag
 	{
@@ -58,26 +62,22 @@ namespace data {
 
 			std::string ToBase64 (size_t len = sz) const
 			{
-				char str[sz*2];
+				return i2p::data::ByteStreamToBase64 (m_Buf, len);
-				size_t l = i2p::data::ByteStreamToBase64 (m_Buf, len, str, sz*2);
-				return std::string (str, str + l);
 			}
 
 			std::string ToBase32 (size_t len = sz) const
 			{
-				char str[sz*2];
+				return i2p::data::ByteStreamToBase32 (m_Buf, len);
-				size_t l = i2p::data::ByteStreamToBase32 (m_Buf, len, str, sz*2);
-				return std::string (str, str + l);
 			}
 
-			size_t FromBase32 (const std::string& s)
+			size_t FromBase32 (std::string_view s)
 			{
-				return i2p::data::Base32ToByteStream (s.c_str (), s.length (), m_Buf, sz);
+				return i2p::data::Base32ToByteStream (s, m_Buf, sz);
 			}
 
-			size_t FromBase64 (const std::string& s)
+			size_t FromBase64 (std::string_view s)
 			{
-				return i2p::data::Base64ToByteStream (s.c_str (), s.length (), m_Buf, sz);
+				return i2p::data::Base64ToByteStream (s, m_Buf, sz);
 			}
 
 			uint8_t GetBit (int i) const

libi2pd/TransitTunnel.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -101,13 +101,13 @@ namespace tunnel
 		TunnelMessageBlock block;
 		block.deliveryType = eDeliveryTypeLocal;
 		block.data = msg;
-		std::unique_lock<std::mutex> l(m_SendMutex);
+		std::lock_guard<std::mutex> l(m_SendMutex);
 		m_Gateway.PutTunnelDataMsg (block);
 	}
 
 	void TransitTunnelGateway::FlushTunnelDataMsgs ()
 	{
-		std::unique_lock<std::mutex> l(m_SendMutex);
+		std::lock_guard<std::mutex> l(m_SendMutex);
 		m_Gateway.SendBuffer ();
 	}
 
@@ -130,20 +130,36 @@ namespace tunnel
 		EncryptTunnelMsg (tunnelMsg, newMsg);
 
 		LogPrint (eLogDebug, "TransitTunnel: handle msg for endpoint ", GetTunnelID ());
-		m_Endpoint.HandleDecryptedTunnelDataMsg (newMsg);
+		std::lock_guard<std::mutex> l(m_HandleMutex);
+		if (!m_Endpoint) m_Endpoint = std::make_unique<TunnelEndpoint>(false); // transit endpoint is always outbound
+		m_Endpoint->HandleDecryptedTunnelDataMsg (newMsg);
 	}
 
 	void TransitTunnelEndpoint::FlushTunnelDataMsgs ()
 	{
-		m_Endpoint.FlushI2NPMsgs ();
+		if (m_Endpoint)
+		{
+			std::lock_guard<std::mutex> l(m_HandleMutex);
+			m_Endpoint->FlushI2NPMsgs ();
+		}	
+	}	
+
+	void TransitTunnelEndpoint::Cleanup ()
+	{ 
+		if (m_Endpoint)
+		{	
+			std::lock_guard<std::mutex> l(m_HandleMutex);
+			m_Endpoint->Cleanup ();
+		}	
 	}	
 		
 	std::string TransitTunnelEndpoint::GetNextPeerName () const
 	{ 
-		auto hash = m_Endpoint.GetCurrentHash ();
+		if (!m_Endpoint) return "";
+		auto hash = m_Endpoint->GetCurrentHash ();
 		if (hash)
 		{	
-			const auto& sender = m_Endpoint.GetSender ();
+			const auto& sender = m_Endpoint->GetSender ();
 			if (sender)
 			{
 				auto transport = sender->GetCurrentTransport ();
@@ -180,7 +196,7 @@ namespace tunnel
 	}
 
 	TransitTunnels::TransitTunnels ():
-		m_IsRunning (false)
+		m_IsRunning (false), m_Rng(i2p::util::GetMonotonicMicroseconds ()%1000000LL)
 	{
 	}
 		
@@ -320,19 +336,44 @@ namespace tunnel
 				// check if we accept this tunnel
 				std::shared_ptr<i2p::tunnel::TransitTunnel> transitTunnel;
 				uint8_t retCode = 0;
-				if (!i2p::context.AcceptsTunnels () || i2p::context.GetCongestionLevel (false) >= CONGESTION_LEVEL_FULL)
+				if (i2p::context.AcceptsTunnels ())
+				{
+					auto congestionLevel = i2p::context.GetCongestionLevel (false);
+					if (congestionLevel < CONGESTION_LEVEL_FULL)
+					{	
+						if (congestionLevel >= CONGESTION_LEVEL_MEDIUM)
+						{	
+							// random reject depending on congestion level
+							int level = m_Rng () % (CONGESTION_LEVEL_FULL - CONGESTION_LEVEL_MEDIUM) + CONGESTION_LEVEL_MEDIUM;
+							if (congestionLevel > level)
+								retCode = 30;
+						}	
+					}	
+					else
+						retCode = 30;
+				}	
+				else	
 					retCode = 30;
+				
 				if (!retCode)
 				{
-					// create new transit tunnel
+					i2p::data::IdentHash nextIdent(clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET);
-					transitTunnel = i2p::tunnel::CreateTransitTunnel (
+					bool isEndpoint = clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG;
-						bufbe32toh (clearText + SHORT_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
+					if (isEndpoint || !i2p::data::IsRouterDuplicated (nextIdent))
-						clearText + SHORT_REQUEST_RECORD_NEXT_IDENT_OFFSET,
+					{	
-						bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
+						// create new transit tunnel
-						layerKey, ivKey,
+						transitTunnel = CreateTransitTunnel (
-						clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
+							bufbe32toh (clearText + SHORT_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
-						clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG);
+							nextIdent,
-					if (!AddTransitTunnel (transitTunnel))
+							bufbe32toh (clearText + SHORT_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
+							layerKey, ivKey,
+							clearText[SHORT_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
+							isEndpoint);
+						if (!AddTransitTunnel (transitTunnel))
+							retCode = 30;
+					}
+					else
+						// decline tunnel going to duplicated router 
 						retCode = 30;
 				}
 
@@ -444,7 +485,7 @@ namespace tunnel
 						if (congestionLevel < CONGESTION_LEVEL_FULL)
 						{
 							// random reject depending on congestion level
-							int level = i2p::tunnel::tunnels.GetRng ()() % (CONGESTION_LEVEL_FULL - CONGESTION_LEVEL_MEDIUM) + CONGESTION_LEVEL_MEDIUM;
+							int level = m_Rng () % (CONGESTION_LEVEL_FULL - CONGESTION_LEVEL_MEDIUM) + CONGESTION_LEVEL_MEDIUM;
 							if (congestionLevel > level)
 								accept = false;
 						}	
@@ -452,23 +493,32 @@ namespace tunnel
 							accept = false;
 					}	
 				}	
-				// replace record to reply
+					
 				if (accept)
 				{
-					auto transitTunnel = i2p::tunnel::CreateTransitTunnel (
+					i2p::data::IdentHash nextIdent(clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET);
-							bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
+					bool isEndpoint = clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG;
-							clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET,
+					if (isEndpoint || !i2p::data::IsRouterDuplicated (nextIdent))
-							bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
+					{	
-							clearText + ECIES_BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET,
+						auto transitTunnel = CreateTransitTunnel (
-							clearText + ECIES_BUILD_REQUEST_RECORD_IV_KEY_OFFSET,
+								bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET),
-							clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
+								nextIdent,
-							clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_ENDPOINT_FLAG);
+								bufbe32toh (clearText + ECIES_BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET),
-					if (!AddTransitTunnel (transitTunnel))
+								clearText + ECIES_BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET,
+								clearText + ECIES_BUILD_REQUEST_RECORD_IV_KEY_OFFSET,
+								clearText[ECIES_BUILD_REQUEST_RECORD_FLAG_OFFSET] & TUNNEL_BUILD_RECORD_GATEWAY_FLAG,
+								isEndpoint);
+						if (!AddTransitTunnel (transitTunnel))
+							retCode = 30;
+					}	
+					else
+						// decline tunnel going to duplicated router 
 						retCode = 30;
 				}
 				else
 					retCode = 30; // always reject with bandwidth reason (30)
 
+				// replace record to reply
 				memset (record + ECIES_BUILD_RESPONSE_RECORD_OPTIONS_OFFSET, 0, 2); // no options
 				record[ECIES_BUILD_RESPONSE_RECORD_RET_OFFSET] = retCode;
 				// encrypt reply

libi2pd/TransitTunnel.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -97,19 +97,19 @@ namespace tunnel
 			TransitTunnelEndpoint (uint32_t receiveTunnelID,
 				const i2p::data::IdentHash& nextIdent, uint32_t nextTunnelID,
 				const i2p::crypto::AESKey& layerKey, const i2p::crypto::AESKey& ivKey):
-				TransitTunnel (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey),
+				TransitTunnel (receiveTunnelID, nextIdent, nextTunnelID, layerKey, ivKey) {}; 
-				m_Endpoint (false) {}; // transit endpoint is always outbound
 
-			void Cleanup () override { m_Endpoint.Cleanup (); }
+			void Cleanup () override;
 		
 			void HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg) override;
 			void FlushTunnelDataMsgs () override;
-			size_t GetNumTransmittedBytes () const override { return m_Endpoint.GetNumReceivedBytes (); }
+			size_t GetNumTransmittedBytes () const override { return m_Endpoint ? m_Endpoint->GetNumReceivedBytes () : 0; }
 			std::string GetNextPeerName () const override;
 			
 		private:
 
-			TunnelEndpoint m_Endpoint;
+			std::mutex m_HandleMutex;
+			std::unique_ptr<TunnelEndpoint> m_Endpoint;
 	};
 
 	std::shared_ptr<TransitTunnel> CreateTransitTunnel (uint32_t receiveTunnelID,
@@ -151,6 +151,7 @@ namespace tunnel
 			std::unique_ptr<std::thread> m_Thread;
 			std::list<std::shared_ptr<TransitTunnel> > m_TransitTunnels;
 			i2p::util::Queue<std::shared_ptr<I2NPMessage> > m_TunnelBuildMsgQueue;
+			std::mt19937 m_Rng;
 			
 		public:
 

libi2pd/TransportSession.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -10,7 +10,7 @@
 #define TRANSPORT_SESSION_H__
 
 #include <inttypes.h>
-#include <iostream>
+#include <string.h>
 #include <memory>
 #include <vector>
 #include <mutex>
@@ -28,45 +28,51 @@ namespace transport
 	const size_t IPV6_HEADER_SIZE = 40;
 	const size_t UDP_HEADER_SIZE = 8;
 
+	template<size_t sz>
 	class SignedData
 	{
 		public:
 
-			SignedData () {}
+			SignedData (): m_Size(0) {}
 			SignedData (const SignedData& other)
 			{
-				m_Stream << other.m_Stream.rdbuf ();
+				m_Size = other.m_Size;
+				memcpy (m_Buf, other.m_Buf, m_Size);
 			}
 
 			void Reset ()
 			{
-				m_Stream.str("");
+				m_Size = 0;
 			}
 
-			void Insert (const uint8_t * buf, size_t len)
+			size_t Insert (const uint8_t * buf, size_t len)
 			{
-				m_Stream.write ((char *)buf, len);
+				if (m_Size + len > sz) len = sz - m_Size;
+				memcpy (m_Buf + m_Size, buf, len); 
+				m_Size += len;
+				return len;
 			}
 
 			template<typename T>
 			void Insert (T t)
 			{
-				m_Stream.write ((char *)&t, sizeof (T));
+				Insert ((const uint8_t *)&t, sizeof (T));
 			}
 
 			bool Verify (std::shared_ptr<const i2p::data::IdentityEx> ident, const uint8_t * signature) const
 			{
-				return ident->Verify ((const uint8_t *)m_Stream.str ().c_str (), m_Stream.str ().size (), signature);
+				return ident->Verify (m_Buf, m_Size, signature);
 			}
 
 			void Sign (const i2p::data::PrivateKeys& keys, uint8_t * signature) const
 			{
-				keys.Sign ((const uint8_t *)m_Stream.str ().c_str (), m_Stream.str ().size (), signature);
+				keys.Sign (m_Buf, m_Size, signature);
 			}
 
 		private:
 
-			std::stringstream m_Stream;
+			uint8_t m_Buf[sz];
+			size_t m_Size;
 	};
 
 	const int64_t TRANSPORT_SESSION_SLOWNESS_THRESHOLD = 500; // in milliseconds

libi2pd/Transports.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -160,7 +160,8 @@ namespace transport
 		m_TotalSentBytes (0), m_TotalReceivedBytes (0), m_TotalTransitTransmittedBytes (0),
 		m_InBandwidth (0), m_OutBandwidth (0), m_TransitBandwidth (0),
 		m_InBandwidth15s (0), m_OutBandwidth15s (0), m_TransitBandwidth15s (0),
-		m_InBandwidth5m (0), m_OutBandwidth5m (0), m_TransitBandwidth5m (0)
+		m_InBandwidth5m (0), m_OutBandwidth5m (0), m_TransitBandwidth5m (0),
+		m_Rng(i2p::util::GetMonotonicMicroseconds () % 1000000LL)
 	{
 	}
 
@@ -338,7 +339,7 @@ namespace transport
 
 		if (m_IsNAT)
 		{
-			m_PeerTestTimer->expires_from_now (boost::posix_time::minutes(PEER_TEST_INTERVAL));
+			m_PeerTestTimer->expires_from_now (boost::posix_time::seconds(PEER_TEST_INTERVAL + m_Rng() % PEER_TEST_INTERVAL_VARIANCE));
 			m_PeerTestTimer->async_wait (std::bind (&Transports::HandlePeerTestTimer, this, std::placeholders::_1));
 		}
 	}
@@ -560,7 +561,14 @@ namespace transport
 	bool Transports::ConnectToPeer (const i2p::data::IdentHash& ident, std::shared_ptr<Peer> peer)
 	{
 		if (!peer->router) // reconnect
-			peer->SetRouter (netdb.FindRouter (ident)); // try to get new one from netdb
+		{	
+			auto r = netdb.FindRouter (ident); // try to get new one from netdb
+			if (r)
+			{	
+				peer->SetRouter (r); 
+				r->CancelBufferToDelete ();
+			}	
+		}	
 		if (peer->router) // we have RI already
 		{
 			if (peer->priority.empty ())
@@ -647,7 +655,7 @@ namespace transport
 		return true;
 	}
 
-	void Transports::SetPriority (std::shared_ptr<Peer> peer) const
+	void Transports::SetPriority (std::shared_ptr<Peer> peer)
 	{
 		static const std::vector<i2p::data::RouterInfo::SupportedTransports>
 			ntcp2Priority =
@@ -672,8 +680,21 @@ namespace transport
 		auto directTransports = compatibleTransports & peer->router->GetPublishedTransports ();
 		peer->numAttempts = 0;
 		peer->priority.clear ();
-		bool isReal = peer->router->GetProfile ()->IsReal (); 
+		
-		bool ssu2 = isReal ? (rand () & 1) : false; // try NTCP2 if router is not confirmed real
+		std::shared_ptr<RouterProfile> profile;
+		if (peer->router->HasProfile ()) profile = peer->router->GetProfile (); // only if in memory
+		bool ssu2 = false; // NTCP2 by default
+		bool isReal = profile ? profile->IsReal () : true;
+		if (isReal) 
+		{	
+			ssu2 = m_Rng () & 1; // 1/2
+			if (ssu2 && !profile)
+			{	
+				profile = peer->router->GetProfile (); // load profile if necessary
+				isReal = profile->IsReal ();  
+				if (!isReal) ssu2 = false; // try NTCP2 if router is not confirmed real
+			}
+		}	
 		const auto& priority = ssu2 ? ssu2Priority : ntcp2Priority;
 		if (directTransports)
 		{	
@@ -701,7 +722,8 @@ namespace transport
 			// try recently connected SSU2 if any
 			auto supportedTransports = context.GetRouterInfo ().GetCompatibleTransports (false) &
 				peer->router->GetCompatibleTransports (false);
-			if (supportedTransports & (i2p::data::RouterInfo::eSSU2V4 | i2p::data::RouterInfo::eSSU2V6))
+			if ((supportedTransports & (i2p::data::RouterInfo::eSSU2V4 | i2p::data::RouterInfo::eSSU2V6)) &&
+			    peer->router->HasProfile ())
 			{
 				auto ep = peer->router->GetProfile ()->GetLastEndpoint ();
 				if (!ep.address ().is_unspecified () && ep.port ())
@@ -791,7 +813,7 @@ namespace transport
 					}	
 					else
 					{
-						testDelay += PEER_TEST_DELAY_INTERVAL + rand() % PEER_TEST_DELAY_INTERVAL_VARIANCE;
+						testDelay += PEER_TEST_DELAY_INTERVAL + m_Rng() % PEER_TEST_DELAY_INTERVAL_VARIANCE;
 						if (m_Service)
 						{	
 							auto delayTimer = std::make_shared<boost::asio::deadline_timer>(*m_Service);
@@ -829,7 +851,7 @@ namespace transport
 					}	
 					else
 					{
-						testDelay += PEER_TEST_DELAY_INTERVAL + rand() % PEER_TEST_DELAY_INTERVAL_VARIANCE;
+						testDelay += PEER_TEST_DELAY_INTERVAL + m_Rng() % PEER_TEST_DELAY_INTERVAL_VARIANCE;
 						if (m_Service)
 						{	
 							auto delayTimer = std::make_shared<boost::asio::deadline_timer>(*m_Service);
@@ -886,7 +908,11 @@ namespace transport
 					auto transport = peer->priority[peer->numAttempts-1];
 					if (transport == i2p::data::RouterInfo::eNTCP2V4 || 
 						transport == i2p::data::RouterInfo::eNTCP2V6 || transport == i2p::data::RouterInfo::eNTCP2V6Mesh)
-						peer->router->GetProfile ()->Connected (); // outgoing NTCP2 connection if always real
+							i2p::data::UpdateRouterProfile (ident,
+								[](std::shared_ptr<i2p::data::RouterProfile> profile)
+								{
+									if (profile) profile->Connected (); // outgoing NTCP2 connection if always real
+								});
 					i2p::data::netdb.SetUnreachable (ident, false); // clear unreachable 
 				}		
 				peer->numAttempts = 0;
@@ -921,7 +947,11 @@ namespace transport
 					session->SendI2NPMessages (msgs); // send DatabaseStore
 				}	
 				auto r = i2p::data::netdb.FindRouter (ident); // router should be in netdb after SessionConfirmed
-				if (r) r->GetProfile ()->Connected ();
+				i2p::data::UpdateRouterProfile (ident,
+					[](std::shared_ptr<i2p::data::RouterProfile> profile)
+					{
+						if (profile) profile->Connected ();
+					});
 				auto ts = i2p::util::GetSecondsSinceEpoch ();
 				auto peer = std::make_shared<Peer>(r, ts);
 				peer->sessions.push_back (session);
@@ -955,8 +985,13 @@ namespace transport
 					}
 					else
 					{
-						std::lock_guard<std::mutex> l(m_PeersMutex);
+						{
-						m_Peers.erase (it);
+							std::lock_guard<std::mutex> l(m_PeersMutex);
+							m_Peers.erase (it);
+						}
+						// delete buffer of just disconnected router 
+						auto r = i2p::data::netdb.FindRouter (ident);
+						if (r && !r->IsUpdated ()) r->ScheduleBufferToDelete ();
 					}
 				}
 			}
@@ -1006,7 +1041,7 @@ namespace transport
 						if (session)
 							session->SendLocalRouterInfo (true);
 						it->second->nextRouterInfoUpdateTime = ts + PEER_ROUTER_INFO_UPDATE_INTERVAL +
-							rand () % PEER_ROUTER_INFO_UPDATE_INTERVAL_VARIANCE;
+							m_Rng() % PEER_ROUTER_INFO_UPDATE_INTERVAL_VARIANCE;
 					}
 					++it;
 				}
@@ -1020,7 +1055,7 @@ namespace transport
 			// if still testing or unknown, repeat peer test
 			if (ipv4Testing || ipv6Testing)
 				PeerTest (ipv4Testing, ipv6Testing);
-			m_PeerCleanupTimer->expires_from_now (boost::posix_time::seconds(3 * SESSION_CREATION_TIMEOUT));
+			m_PeerCleanupTimer->expires_from_now (boost::posix_time::seconds(2 * SESSION_CREATION_TIMEOUT + m_Rng() % SESSION_CREATION_TIMEOUT));
 			m_PeerCleanupTimer->async_wait (std::bind (&Transports::HandlePeerCleanupTimer, this, std::placeholders::_1));
 		}
 	}
@@ -1030,7 +1065,7 @@ namespace transport
 		if (ecode != boost::asio::error::operation_aborted)
 		{
 			PeerTest ();
-			m_PeerTestTimer->expires_from_now (boost::posix_time::minutes(PEER_TEST_INTERVAL));
+			m_PeerTestTimer->expires_from_now (boost::posix_time::seconds(PEER_TEST_INTERVAL + m_Rng() % PEER_TEST_INTERVAL_VARIANCE));
 			m_PeerTestTimer->async_wait (std::bind (&Transports::HandlePeerTestTimer, this, std::placeholders::_1));
 		}
 	}
@@ -1160,7 +1195,7 @@ namespace transport
 		std::lock_guard<std::mutex> lock(m_TrustedRoutersMutex);
 		m_TrustedRouters.clear();
 		for (const auto & ri : routers )
-			m_TrustedRouters.push_back(ri);
+			m_TrustedRouters.insert(ri);
 	}
 
 	bool Transports::RoutesRestricted() const 
@@ -1177,7 +1212,7 @@ namespace transport
 	}
 
 	/** XXX: if routes are not restricted this dies */
-	std::shared_ptr<const i2p::data::RouterInfo> Transports::GetRestrictedPeer() const
+	std::shared_ptr<const i2p::data::RouterInfo> Transports::GetRestrictedPeer()
 	{
 		{
 			std::lock_guard<std::mutex> l(m_FamilyMutex);
@@ -1186,7 +1221,7 @@ namespace transport
 			if(sz > 1)
 			{
 				auto it = m_TrustedFamilies.begin ();
-				std::advance(it, rand() % sz);
+				std::advance(it, m_Rng() % sz);
 				fam = *it;
 			}
 			else if (sz == 1)
@@ -1201,23 +1236,32 @@ namespace transport
 			auto sz = m_TrustedRouters.size();
 			if (sz)
 			{
-				if(sz == 1)
-					return i2p::data::netdb.FindRouter(m_TrustedRouters[0]);
 				auto it = m_TrustedRouters.begin();
-				std::advance(it, rand() % sz);
+				if(sz > 1)
+					std::advance(it, m_Rng() % sz);
 				return i2p::data::netdb.FindRouter(*it);
 			}
 		}
 		return nullptr;
 	}
 
-	bool Transports::IsRestrictedPeer(const i2p::data::IdentHash & ih) const
+	bool Transports::IsTrustedRouter (const i2p::data::IdentHash& ih) const
 	{
-		{
+		if (m_TrustedRouters.empty ()) return false;
-			std::lock_guard<std::mutex> l(m_TrustedRoutersMutex);
+		std::lock_guard<std::mutex> l(m_TrustedRoutersMutex);
-			for (const auto & r : m_TrustedRouters )
+#if __cplusplus >= 202002L // C++20
-				if ( r == ih ) return true;
+		if (m_TrustedRouters.contains (ih))
-		}
+#else
+		if (m_TrustedRouters.count (ih) > 0)
+#endif		
+			return true;
+		return false;
+	}	
+		
+	bool Transports::IsRestrictedPeer(const i2p::data::IdentHash& ih) const
+	{
+		if (IsTrustedRouter (ih)) return true;
+		
 		{
 			std::lock_guard<std::mutex> l(m_FamilyMutex);
 			auto ri = i2p::data::netdb.FindRouter(ih);

libi2pd/Transports.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -15,11 +15,13 @@
 #include <condition_variable>
 #include <functional>
 #include <unordered_map>
+#include <unordered_set>
 #include <vector>
 #include <queue>
 #include <string>
 #include <memory>
 #include <atomic>
+#include <random>
 #include <boost/asio.hpp>
 #include "TransportSession.h"
 #include "SSU2.h"
@@ -106,7 +108,8 @@ namespace transport
 	};
 
 	const uint64_t SESSION_CREATION_TIMEOUT = 15; // in seconds
-	const int PEER_TEST_INTERVAL = 71; // in minutes
+	const int PEER_TEST_INTERVAL = 68*60; // in seconds
+	const int PEER_TEST_INTERVAL_VARIANCE = 3*60; // in seconds
 	const int PEER_TEST_DELAY_INTERVAL = 20; // in milliseconds
 	const int PEER_TEST_DELAY_INTERVAL_VARIANCE = 30; // in milliseconds
 	const int MAX_NUM_DELAYED_MESSAGES = 150;
@@ -168,7 +171,7 @@ namespace transport
 			std::shared_ptr<const i2p::data::RouterInfo> GetRandomPeer (bool isHighBandwidth) const;
 
 			/** get a trusted first hop for restricted routes */
-			std::shared_ptr<const i2p::data::RouterInfo> GetRestrictedPeer() const;
+			std::shared_ptr<const i2p::data::RouterInfo> GetRestrictedPeer();
 			/** do we want to use restricted routes? */
 			bool RoutesRestricted() const;
 			/** restrict routes to use only these router families for first hops */
@@ -176,7 +179,8 @@ namespace transport
 			/** restrict routes to use only these routers for first hops */
 			void RestrictRoutesToRouters(const std::set<i2p::data::IdentHash>& routers);
 
-			bool IsRestrictedPeer(const i2p::data::IdentHash & ident) const;
+			bool IsTrustedRouter (const i2p::data::IdentHash& ih) const;
+			bool IsRestrictedPeer(const i2p::data::IdentHash& ih) const;
 
 			void PeerTest (bool ipv4 = true, bool ipv6 = true);
 
@@ -191,7 +195,7 @@ namespace transport
 			void HandleRequestComplete (std::shared_ptr<const i2p::data::RouterInfo> r, i2p::data::IdentHash ident);
 			std::shared_ptr<TransportSession> PostMessages (const i2p::data::IdentHash& ident, std::list<std::shared_ptr<i2p::I2NPMessage> >& msgs);
 			bool ConnectToPeer (const i2p::data::IdentHash& ident, std::shared_ptr<Peer> peer);
-			void SetPriority (std::shared_ptr<Peer> peer) const;
+			void SetPriority (std::shared_ptr<Peer> peer);
 			void HandlePeerCleanupTimer (const boost::system::error_code& ecode);
 			void HandlePeerTestTimer (const boost::system::error_code& ecode);
 			void HandleUpdateBandwidthTimer (const boost::system::error_code& ecode);
@@ -235,10 +239,11 @@ namespace transport
 			mutable std::mutex m_FamilyMutex;
 
 			/** which routers for first hop to trust */
-			std::vector<i2p::data::IdentHash> m_TrustedRouters;
+			std::unordered_set<i2p::data::IdentHash> m_TrustedRouters;
 			mutable std::mutex m_TrustedRoutersMutex;
 
 			i2p::I2NPMessagesHandler m_LoopbackHandler;
+			std::mt19937 m_Rng;
 
 		public:
 

libi2pd/Tunnel.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -103,7 +103,7 @@ namespace tunnel
 			if (m_Config->IsShort ())
 			{
 				auto ident = m_Config->GetFirstHop () ? m_Config->GetFirstHop ()->ident : nullptr;
-				if (ident && ident->GetIdentHash () != outboundTunnel->GetNextIdentHash ()) // don't encrypt if IBGW = OBEP
+				if (ident && ident->GetIdentHash () != outboundTunnel->GetEndpointIdentHash ()) // don't encrypt if IBGW = OBEP
 				{
 					auto msg1 = i2p::garlic::WrapECIESX25519MessageForRouter (msg, ident->GetEncryptionPublicKey ());
 					if (msg1) msg = msg1;
@@ -179,9 +179,12 @@ namespace tunnel
 		{
 			uint8_t ret = hop->GetRetCode (msg + 1);
 			LogPrint (eLogDebug, "Tunnel: Build response ret code=", (int)ret);
-			auto profile = i2p::data::netdb.FindRouterProfile (hop->ident->GetIdentHash ());
+			if (hop->ident)
-			if (profile)
+				i2p::data::UpdateRouterProfile (hop->ident->GetIdentHash (),
-				profile->TunnelBuildResponse (ret);
+					[ret](std::shared_ptr<i2p::data::RouterProfile> profile)
+					{
+						if (profile) profile->TunnelBuildResponse (ret);
+					});
 			if (ret)
 				// if any of participants declined the tunnel is not established
 				established = false;
@@ -278,6 +281,21 @@ namespace tunnel
 		m_Endpoint.HandleDecryptedTunnelDataMsg (msg);
 	}
 
+	bool InboundTunnel::Recreate ()
+	{
+		if (!IsRecreated ())
+		{
+			auto pool = GetTunnelPool ();
+			if (pool)
+			{
+				SetRecreated (true);
+				pool->RecreateInboundTunnel (std::static_pointer_cast<InboundTunnel>(shared_from_this ()));
+				return true;
+			}	
+		}
+		return false;
+	}	
+		
 	ZeroHopsInboundTunnel::ZeroHopsInboundTunnel ():
 		InboundTunnel (std::make_shared<ZeroHopsTunnelConfig> ()),
 		m_NumReceivedBytes (0)
@@ -297,22 +315,28 @@ namespace tunnel
 	void OutboundTunnel::SendTunnelDataMsgTo (const uint8_t * gwHash, uint32_t gwTunnel, std::shared_ptr<i2p::I2NPMessage> msg)
 	{
 		TunnelMessageBlock block;
+		block.tunnelID = 0; // Initialize tunnelID to a default value
+	
 		if (gwHash)
 		{
 			block.hash = gwHash;
 			if (gwTunnel)
 			{
 				block.deliveryType = eDeliveryTypeTunnel;
-				block.tunnelID = gwTunnel;
+				block.tunnelID = gwTunnel; // Set tunnelID only if gwTunnel is non-zero
 			}
 			else
+			{
 				block.deliveryType = eDeliveryTypeRouter;
+			}
 		}
 		else
+		{
 			block.deliveryType = eDeliveryTypeLocal;
-		block.data = msg;
+		}
 	
-		SendTunnelDataMsgs ({block});
+		block.data = msg;
+		SendTunnelDataMsgs({block});
 	}
 
 	void OutboundTunnel::SendTunnelDataMsgs (const std::vector<TunnelMessageBlock>& msgs)
@@ -328,6 +352,21 @@ namespace tunnel
 		LogPrint (eLogError, "Tunnel: Incoming message for outbound tunnel ", GetTunnelID ());
 	}
 
+	bool OutboundTunnel::Recreate ()
+	{
+		if (!IsRecreated ())
+		{
+			auto pool = GetTunnelPool ();
+			if (pool)
+			{
+				SetRecreated (true);
+				pool->RecreateOutboundTunnel (std::static_pointer_cast<OutboundTunnel>(shared_from_this ()));
+				return true;
+			}	
+		}
+		return false;
+	}
+		
 	ZeroHopsOutboundTunnel::ZeroHopsOutboundTunnel ():
 		OutboundTunnel (std::make_shared<ZeroHopsTunnelConfig> ()),
 		m_NumSentBytes (0)
@@ -434,7 +473,7 @@ namespace tunnel
 	std::shared_ptr<OutboundTunnel> Tunnels::GetNextOutboundTunnel ()
 	{
 		if (m_OutboundTunnels.empty ()) return nullptr;
-		uint32_t ind = rand () % m_OutboundTunnels.size (), i = 0;
+		uint32_t ind = m_Rng () % m_OutboundTunnels.size (), i = 0;
 		std::shared_ptr<OutboundTunnel> tunnel;
 		for (const auto& it: m_OutboundTunnels)
 		{
@@ -711,8 +750,17 @@ namespace tunnel
 	void Tunnels::ManageTunnels (uint64_t ts)
 	{
 		ManagePendingTunnels (ts);
-		ManageInboundTunnels (ts);
+		std::vector<std::shared_ptr<Tunnel> > tunnelsToRecreate;
-		ManageOutboundTunnels (ts);
+		ManageInboundTunnels (ts, tunnelsToRecreate);
+		ManageOutboundTunnels (ts, tunnelsToRecreate);
+		// rec-create in random order
+		if (!tunnelsToRecreate.empty ())
+		{	
+			if (tunnelsToRecreate.size () > 1)
+				std::shuffle (tunnelsToRecreate.begin(), tunnelsToRecreate.end(), m_Rng);
+			for (auto& it: tunnelsToRecreate)
+				it->Recreate ();
+		}	
 	}
 
 	void Tunnels::ManagePendingTunnels (uint64_t ts)
@@ -743,11 +791,11 @@ namespace tunnel
 							while (hop)
 							{
 								if (hop->ident)
-								{
+									i2p::data::UpdateRouterProfile (hop->ident->GetIdentHash (),
-									auto profile = i2p::data::netdb.FindRouterProfile (hop->ident->GetIdentHash ());
+										[](std::shared_ptr<i2p::data::RouterProfile> profile)
-									if (profile)
+				    					{
-										profile->TunnelNonReplied ();
+											if (profile) profile->TunnelNonReplied ();
-								}
+										});
 								hop = hop->next;
 							}
 						}
@@ -775,7 +823,7 @@ namespace tunnel
 		}
 	}
 
-	void Tunnels::ManageOutboundTunnels (uint64_t ts)
+	void Tunnels::ManageOutboundTunnels (uint64_t ts, std::vector<std::shared_ptr<Tunnel> >& toRecreate)
 	{
 		for (auto it = m_OutboundTunnels.begin (); it != m_OutboundTunnels.end ();)
 		{
@@ -799,10 +847,7 @@ namespace tunnel
 						auto pool = tunnel->GetTunnelPool ();
 						// let it die if the tunnel pool has been reconfigured and this is old
 						if (pool && tunnel->GetNumHops() == pool->GetNumOutboundHops())
-						{
+							toRecreate.push_back (tunnel);
-							tunnel->SetRecreated (true);
-							pool->RecreateOutboundTunnel (tunnel);
-						}
 					}
 					if (ts + TUNNEL_EXPIRATION_THRESHOLD > tunnel->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT)
 						tunnel->SetState (eTunnelStateExpiring);
@@ -827,7 +872,7 @@ namespace tunnel
 		}
 	}
 
-	void Tunnels::ManageInboundTunnels (uint64_t ts)
+	void Tunnels::ManageInboundTunnels (uint64_t ts, std::vector<std::shared_ptr<Tunnel> >& toRecreate)
 	{
 		for (auto it = m_InboundTunnels.begin (); it != m_InboundTunnels.end ();)
 		{
@@ -851,10 +896,7 @@ namespace tunnel
 						auto pool = tunnel->GetTunnelPool ();
 						// let it die if the tunnel pool was reconfigured and has different number of hops
 						if (pool && tunnel->GetNumHops() == pool->GetNumInboundHops())
-						{
+							toRecreate.push_back (tunnel);
-							tunnel->SetRecreated (true);
-							pool->RecreateInboundTunnel (tunnel);
-						}
 					}
 
 					if (ts + TUNNEL_EXPIRATION_THRESHOLD > tunnel->GetCreationTime () + TUNNEL_EXPIRATION_TIMEOUT)

libi2pd/Tunnel.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -99,6 +99,7 @@ namespace tunnel
 			void SetRecreated (bool recreated) { m_IsRecreated = recreated; };
 			int GetNumHops () const { return m_Hops.size (); };
 			virtual bool IsInbound() const = 0;
+			virtual bool Recreate () = 0;
 
 			std::shared_ptr<TunnelPool> GetTunnelPool () const { return m_Pool; };
 			void SetTunnelPool (std::shared_ptr<TunnelPool> pool) { m_Pool = pool; };
@@ -150,6 +151,7 @@ namespace tunnel
 			void HandleTunnelDataMsg (std::shared_ptr<i2p::I2NPMessage>&& tunnelMsg) override;
 
 			bool IsInbound() const override { return false; }
+			bool Recreate () override;
 
 		private:
 
@@ -166,6 +168,7 @@ namespace tunnel
 			void HandleTunnelDataMsg (std::shared_ptr<I2NPMessage>&& msg) override;
 			virtual size_t GetNumReceivedBytes () const { return m_Endpoint.GetNumReceivedBytes (); };
 			bool IsInbound() const override { return true; }
+			bool Recreate () override;
 
 			// override TunnelBase
 			void Cleanup () override { m_Endpoint.Cleanup (); };
@@ -246,8 +249,6 @@ namespace tunnel
 			uint32_t GetMaxNumTransitTunnels () const { return m_MaxNumTransitTunnels; };
 			int GetCongestionLevel() const { return m_MaxNumTransitTunnels ? CONGESTION_LEVEL_FULL * m_TransitTunnels.GetNumTransitTunnels () / m_MaxNumTransitTunnels : CONGESTION_LEVEL_FULL; }
 			
-			std::mt19937& GetRng () { return m_Rng; };
-			
 		private:
 
 			template<class TTunnel>
@@ -264,8 +265,8 @@ namespace tunnel
 			
 			void Run ();
 			void ManageTunnels (uint64_t ts);
-			void ManageOutboundTunnels (uint64_t ts);
+			void ManageOutboundTunnels (uint64_t ts, std::vector<std::shared_ptr<Tunnel> >& toRecreate);
-			void ManageInboundTunnels (uint64_t ts);
+			void ManageInboundTunnels (uint64_t ts, std::vector<std::shared_ptr<Tunnel> >& toRecreate);
 			void ManagePendingTunnels (uint64_t ts);
 			template<class PendingTunnels>
 			void ManagePendingTunnels (PendingTunnels& pendingTunnels, uint64_t ts);

libi2pd/TunnelEndpoint.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -258,9 +258,8 @@ namespace tunnel
 	void TunnelEndpoint::AddOutOfSequenceFragment (uint32_t msgID, uint8_t fragmentNum,
 		bool isLastFragment, const uint8_t * fragment, size_t size)
 	{
-		std::unique_ptr<Fragment> f(new Fragment (isLastFragment, i2p::util::GetMillisecondsSinceEpoch (), size));
+		if (!m_OutOfSequenceFragments.try_emplace ((uint64_t)msgID << 32 | fragmentNum, 
-		memcpy (f->data.data (), fragment, size);
+			isLastFragment, i2p::util::GetMillisecondsSinceEpoch (), fragment, size).second)
-		if (!m_OutOfSequenceFragments.emplace ((uint64_t)msgID << 32 | fragmentNum, std::move (f)).second)
 			LogPrint (eLogInfo, "TunnelMessage: Duplicate out-of-sequence fragment ", fragmentNum, " of message ", msgID);
 	}
 
@@ -290,7 +289,7 @@ namespace tunnel
 		if (it != m_OutOfSequenceFragments.end ())
 		{
 			LogPrint (eLogDebug, "TunnelMessage: Out-of-sequence fragment ", (int)msg.nextFragmentNum, " of message ", msgID, " found");
-			size_t size = it->second->data.size ();
+			size_t size = it->second.data.size ();
 			if (msg.data->len + size > msg.data->maxLen)
 			{
 				LogPrint (eLogWarning, "TunnelMessage: Tunnel endpoint I2NP message size ", msg.data->maxLen, " is not enough");
@@ -298,9 +297,9 @@ namespace tunnel
 				*newMsg = *(msg.data);
 				msg.data = newMsg;
 			}
-			if (msg.data->Concat (it->second->data.data (), size) < size) // concatenate out-of-sync fragment	
+			if (msg.data->Concat (it->second.data.data (), size) < size) // concatenate out-of-sync fragment	
 				LogPrint (eLogError, "TunnelMessage: Tunnel endpoint I2NP buffer overflow ", msg.data->maxLen);
-			if (it->second->isLastFragment)
+			if (it->second.isLastFragment)
 				// message complete
 				msg.nextFragmentNum = 0;
 			else
@@ -349,7 +348,7 @@ namespace tunnel
 		// out-of-sequence fragments
 		for (auto it = m_OutOfSequenceFragments.begin (); it != m_OutOfSequenceFragments.end ();)
 		{
-			if (ts > it->second->receiveTime + i2p::I2NP_MESSAGE_EXPIRATION_TIMEOUT)
+			if (ts > it->second.receiveTime + i2p::I2NP_MESSAGE_EXPIRATION_TIMEOUT)
 				it = m_OutOfSequenceFragments.erase (it);
 			else
 				++it;

libi2pd/TunnelEndpoint.h

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -32,7 +32,8 @@ namespace tunnel
 
 		struct Fragment
 		{
-			Fragment (bool last, uint64_t t, size_t size): isLastFragment (last), receiveTime (t), data (size) {};
+			Fragment (bool last, uint64_t t, const uint8_t * buf, size_t size): 
+				isLastFragment (last), receiveTime (t), data (size) { memcpy (data.data(), buf, size); };
 			bool isLastFragment;
 			uint64_t receiveTime; // milliseconds since epoch
 			std::vector<uint8_t> data;
@@ -48,7 +49,7 @@ namespace tunnel
 			void HandleDecryptedTunnelDataMsg (std::shared_ptr<I2NPMessage> msg);
 			void FlushI2NPMsgs (); 
 
-			const i2p::data::IdentHash * GetCurrentHash () const; // return null if not avaiable
+			const i2p::data::IdentHash * GetCurrentHash () const; // return null if not available
 			const std::unique_ptr<TunnelTransportSender>& GetSender () const { return m_Sender; };
 		
 		private:
@@ -67,7 +68,7 @@ namespace tunnel
 		private:
 
 			std::unordered_map<uint32_t, TunnelMessageBlockEx> m_IncompleteMessages;
-			std::unordered_map<uint64_t, std::unique_ptr<Fragment> > m_OutOfSequenceFragments; // ((msgID << 8) + fragment#)->fragment
+			std::unordered_map<uint64_t, Fragment> m_OutOfSequenceFragments; // ((msgID << 8) + fragment#)->fragment
 			bool m_IsInbound;
 			size_t m_NumReceivedBytes;
 			TunnelMessageBlockEx m_CurrentMessage;

libi2pd/TunnelPool.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (c) 2013-2024, The PurpleI2P Project
+* Copyright (c) 2013-2025, The PurpleI2P Project
 *
 * This file is part of Purple i2pd project and licensed under BSD3
 *
@@ -351,10 +351,13 @@ namespace tunnel
 				{
 					it.second.first->SetState (eTunnelStateFailed);
 					std::unique_lock<std::mutex> l(m_OutboundTunnelsMutex);
-					if (m_OutboundTunnels.size () > 1 || m_NumOutboundTunnels <= 1) // don't fail last tunnel
+					if (m_OutboundTunnels.size () > 1) // don't fail last tunnel
 						m_OutboundTunnels.erase (it.second.first);
 					else
+					{	
 						it.second.first->SetState (eTunnelStateTestFailed);
+						CreateOutboundTunnel (); // create new tunnel immediately because last one failed
+					}		
 				}
 				else if (it.second.first->GetState () != eTunnelStateExpiring)
 					it.second.first->SetState (eTunnelStateTestFailed);
@@ -368,13 +371,16 @@ namespace tunnel
 						bool failed = false;
 						{
 							std::unique_lock<std::mutex> l(m_InboundTunnelsMutex);
-							if (m_InboundTunnels.size () > 1 || m_NumInboundTunnels <= 1) // don't fail last tunnel
+							if (m_InboundTunnels.size () > 1) // don't fail last tunnel
 							{	
 								m_InboundTunnels.erase (it.second.second);
 								failed = true;	
 							}	
 							else
+							{
 								it.second.second->SetState (eTunnelStateTestFailed);
+								CreateInboundTunnel (); // create new tunnel immediately because last one failed
+							}	
 						}
 						if (failed && m_LocalDestination)
 							m_LocalDestination->SetLeaseSetUpdated (true);
@@ -560,7 +566,7 @@ namespace tunnel
 				i2p::data::netdb.GetRandomRouter (prevHop, reverse, endpoint, false);
 			if (hop)
 			{
-				if (!hop->GetProfile ()->IsBad ())
+				if (!hop->HasProfile () || !hop->GetProfile ()->IsBad ())
 					break;
 			}
 			else if (tryClient)
@@ -588,7 +594,7 @@ namespace tunnel
 			(inbound && i2p::transport::transports.GetNumPeers () > 25))
 		{
 			auto r = i2p::transport::transports.GetRandomPeer (m_IsHighBandwidth && !i2p::context.IsLimitedConnectivity ());
-			if (r && r->IsECIES () && !r->GetProfile ()->IsBad () &&
+			if (r && r->IsECIES () && (!r->HasProfile () || !r->GetProfile ()->IsBad ()) &&
 				(numHops > 1 || (r->IsV4 () && (!inbound || r->IsPublished (true))))) // first inbound must be published ipv4
 			{
 				prevHop = r;