Method SendSessionRequest

libi2pd/SSU2Session.cpp:712–828

	}

	bool SSU2Session::SendSessionRequest (uint64_t token)
	{
		// we are Alice
#if OPENSSL_PQ
		if (m_Server.GetVersion () > 2) // we support post quantum in config
			SetVersion (m_Address->v);
#endif
		m_EphemeralKeys = i2p::transport::transports.GetNextX25519KeysPair ();
		m_SentHandshakePacket.reset (new HandshakePacket);
		auto ts = i2p::util::GetMillisecondsSinceEpoch ();
		m_SentHandshakePacket->sendTime = ts;

		Header& header = m_SentHandshakePacket->header;
		uint8_t * headerX = m_SentHandshakePacket->headerX,
				* payload = m_SentHandshakePacket->payload;
		// fill packet
		header.h.connID = m_DestConnID; // dest id
		RAND_bytes (header.buf + 8, 4); // random packet num
		header.h.type = eSSU2SessionRequest;
		header.h.flags[0] = m_Version; // ver
		header.h.flags[1] = (uint8_t)i2p::context.GetNetID (); // netID
		header.h.flags[2] = 0; // flag
		memcpy (headerX, &m_SourceConnID, 8); // source id
		memcpy (headerX + 8, &token, 8); // token
		memcpy (headerX + 16, m_EphemeralKeys->GetPublicKey (), 32); // X
		// payload
		size_t payloadSize = 0, offset = 0;
#if OPENSSL_PQ
		if (m_Version > 2)
		{
			i2p::data::CryptoKeyType cryptoType = (i2p::data::CryptoKeyType)(m_Version + 2);
			m_PQKeys = i2p::crypto::CreateMLKEMKeys (cryptoType);
            m_PQKeys->GenerateKeys ();
            offset = m_PQKeys->GetKeyLen () + 16;
			payloadSize += offset;
		}
#endif
		payload[payloadSize] = eSSU2BlkDateTime;
		htobe16buf (payload + payloadSize + 1, 4);
		htobe32buf (payload + payloadSize + 3, (ts + 500)/1000);
		payloadSize += 7;
		if (GetRouterStatus () == eRouterStatusFirewalled && m_Address->IsIntroducer ())
		{
			if (!m_Server.IsMaxNumIntroducers (m_RemoteEndpoint.address ().is_v4 ()) ||
			    m_Server.GetRng ()() & 0x01) // request tag with probability 1/2 if we have enough introducers
			{
				// relay tag request
				payload[payloadSize] = eSSU2BlkRelayTagRequest;
				memset (payload + payloadSize + 1, 0, 2); // size = 0
				payloadSize += 3;
			}
		}
		if (payloadSize <= m_MaxPayloadSize - 48)
			payloadSize += CreatePaddingBlock (payload + payloadSize, std::min (m_MaxPayloadSize - payloadSize - 48, (size_t)32));
		else
		{
			LogPrint (eLogError, "SSU2: SessionRequest max payload size is too small ", m_MaxPayloadSize);
			return false;