offline signature for close packet

libi2pd/Streaming.cpp

@@ -1225,7 +1225,6 @@ namespace stream
 		htobe16buf (packet + size, flags);
 		size += 2; // flags
 		size_t identityLen = m_LocalDestination.GetOwner ()->GetIdentity ()->GetFullLen ();
-		size_t signatureLen = m_LocalDestination.GetOwner ()->GetPrivateKeys ().GetSignatureLen ();
 		uint8_t * optionsSize = packet + size; // set options size later
 		size += 2; // options size
 		m_LocalDestination.GetOwner ()->GetIdentity ()->ToBuffer (packet + size, identityLen);
@@ -1240,6 +1239,7 @@ namespace stream
 				memcpy (packet + size, offlineSignature.data (), offlineSignature.size ());
 				size += offlineSignature.size (); // offline signature
 			}
+			size_t signatureLen = m_LocalDestination.GetOwner ()->GetPrivateKeys ().GetSignatureLen ();
 			uint8_t * signature = packet + size; // set it later
 			memset (signature, 0, signatureLen); // zeroes for now
 			size += signatureLen; // signature
@@ -1301,6 +1301,8 @@ namespace stream
 		size++; // resend delay
 		uint16_t flags = PACKET_FLAG_CLOSE;
 		if (!m_DontSign) flags |= PACKET_FLAG_SIGNATURE_INCLUDED;
+		bool isOfflineSignature = m_LocalDestination.GetOwner ()->GetPrivateKeys ().IsOfflineSignature ();
+		if (isOfflineSignature) flags |= PACKET_FLAG_OFFLINE_SIGNATURE;
 		htobe16buf (packet + size, flags);
 		size += 2; // flags
 		if (m_DontSign)
@@ -1310,6 +1312,12 @@ namespace stream
 		}	
 		else
 		{	
+			if (isOfflineSignature)
+			{
+				const auto& offlineSignature = m_LocalDestination.GetOwner ()->GetPrivateKeys ().GetOfflineSignature ();
+				memcpy (packet + size, offlineSignature.data (), offlineSignature.size ());
+				size += offlineSignature.size (); // offline signature
+			}
 			size_t signatureLen = m_LocalDestination.GetOwner ()->GetPrivateKeys ().GetSignatureLen ();
 			htobe16buf (packet + size, signatureLen); // signature only
 			size += 2; // options size