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deccrypt and handle garlic message for ECIES router

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orignal 2020-12-03 22:01:58 -05:00
parent abdf92c084
commit e2fcab34b7
3 changed files with 40 additions and 2 deletions
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24
libi2pd/ECIESX25519AEADRatchetSession.cpp
View file

@ -503,7 +503,7 @@ namespace garlic
m_EphemeralKeys->Agree (m_RemoteStaticKey, sharedSecret); // x25519(aesk, bpk)
MixKey (sharedSecret);
uint8_t nonce[12];
memset (nonce, 0, 12);
CreateNonce (0, nonce);
// encrypt payload
if (!i2p::crypto::AEADChaCha20Poly1305 (payload, len, m_H, 32, m_CK + 32, nonce, out + offset, len + 16, true)) // encrypt
{
@ -770,6 +770,28 @@ namespace garlic
return true;
}
bool ECIESX25519AEADRatchetSession::HandleNextMessageForRouter (const uint8_t * buf, size_t len)
{
if (!GetOwner ()) return false;
// we are Bob
i2p::crypto::InitNoiseNState (*this, GetOwner ()->GetEncryptionPublicKey (i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD)); // bpk
MixHash (buf, 32);
uint8_t sharedSecret[32];
GetOwner ()->Decrypt (buf, sharedSecret, nullptr, i2p::data::CRYPTO_KEY_TYPE_ECIES_X25519_AEAD); // x25519(bsk, aepk)
MixKey (sharedSecret);
buf += 32; len -= 32;
uint8_t nonce[12];
CreateNonce (0, nonce);
std::vector<uint8_t> payload (len - 16);
if (!i2p::crypto::AEADChaCha20Poly1305 (buf, len - 16, m_H, 32, m_CK + 32, nonce, payload.data (), len - 16, false)) // decrypt
{
LogPrint (eLogWarning, "Garlic: Payload for router AEAD verification failed");
return false;
}
HandlePayload (payload.data (), len - 16, nullptr, 0);
return true;
}
std::shared_ptr<I2NPMessage> ECIESX25519AEADRatchetSession::WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg)
{
auto payload = CreatePayload (msg, m_State != eSessionStateEstablished);

1
libi2pd/ECIESX25519AEADRatchetSession.h
View file

@ -158,6 +158,7 @@ namespace garlic
~ECIESX25519AEADRatchetSession ();
bool HandleNextMessage (uint8_t * buf, size_t len, std::shared_ptr<RatchetTagSet> receiveTagset, int index = 0);
bool HandleNextMessageForRouter (const uint8_t * buf, size_t len);
std::shared_ptr<I2NPMessage> WrapSingleMessage (std::shared_ptr<const I2NPMessage> msg);
std::shared_ptr<I2NPMessage> WrapOneTimeMessage (std::shared_ptr<const I2NPMessage> msg, bool isForRouter = false);

17
libi2pd/RouterContext.cpp
View file

@ -19,6 +19,7 @@
#include "version.h"
#include "Log.h"
#include "Family.h"
#include "ECIESX25519AEADRatchetSession.h"
#include "RouterContext.h"
namespace i2p
@ -672,7 +673,21 @@ namespace i2p
void RouterContext::ProcessGarlicMessage (std::shared_ptr<I2NPMessage> msg)
{
std::unique_lock<std::mutex> l(m_GarlicMutex);
i2p::garlic::GarlicDestination::ProcessGarlicMessage (msg);
if (IsECIES ())
{
uint8_t * buf = msg->GetPayload ();
uint32_t len = bufbe32toh (buf);
if (len > msg->GetLength ())
{
LogPrint (eLogWarning, "Router: garlic message length ", len, " exceeds I2NP message length ", msg->GetLength ());
return;
}
buf += 4;
auto session = std::make_shared<i2p::garlic::ECIESX25519AEADRatchetSession>(this, false);
session->HandleNextMessageForRouter (buf, len);
}
else
i2p::garlic::GarlicDestination::ProcessGarlicMessage (msg);
}
void RouterContext::ProcessDeliveryStatusMessage (std::shared_ptr<I2NPMessage> msg)