skip transient signature verification if verified through ECIESx25519 session

libi2pd/Streaming.cpp

@@ -444,6 +444,22 @@ namespace stream
 				LogPrint (eLogInfo, "Streaming: offline signature without identity");
 				return false;
 			}
+			if (sessionVerified)
+			{
+				// skip offline signature
+				optionData += 4; // timestamp 
+				uint16_t keyType = bufbe16toh (optionData); optionData += 2; // key type
+				std::unique_ptr<i2p::crypto::Verifier> transientVerifier (i2p::data::IdentityEx::CreateVerifier (keyType));
+				if (!transientVerifier)
+				{
+					LogPrint (eLogInfo, "Streaming: Unknown offline signature key type ", (int)keyType);
+					return false;
+				}
+				optionData += transientVerifier->GetPublicKeyLen (); // public key
+				optionData += m_RemoteIdentity->GetSignatureLen (); // signature
+			}
+			else
+			{	
 				// if we have it in LeaseSet already we don't need to parse it again
 				if (m_RemoteLeaseSet) m_TransientVerifier = m_RemoteLeaseSet->GetTransientVerifier ();
 				if (m_TransientVerifier)
@@ -466,6 +482,7 @@ namespace stream
 					}
 				}
 			}	
+		}
 
 		if (flags & PACKET_FLAG_SIGNATURE_INCLUDED)
 		{