public override void PacketHandler(N2HBinaryReader reader) { if(Checked){ lock (Writer) { base.PacketHandler(reader); } return; } var marker = reader.ReadByte(); if (marker != 0x0b) { Logger.FATAL("Marker hand shake wrong:should be 0b and not {0:X}", marker); return; } var time = reader.ReadUInt16(); var type = reader.ReadByte(); var length = reader.ReadUInt16(); byte[] tag; Logger.Debug("handshake {0:X} len:{1}",type,length); switch (type) { case 0x70: tag = reader.ReadBytes(reader.ReadByte()); var cookieBytes = reader.ReadBytes(reader.ReadByte()); var targetCertificat = reader.ReadBytes((int)reader.BaseStream.GetAvaliableByteCounts()); var nonce = new byte[0]; _dh = RtmfpUtils.BeginDiffieHellman(ref nonce, true); Peer.Id = Target.Sha256.ComputeHash(nonce, 0, nonce.Length); HandShake38(cookieBytes, nonce); _handshake = () => HandShake38(cookieBytes, nonce); break; case 0x71: tag = reader.ReadBytes(reader.ReadByte()); var flag = reader.ReadByte(); var address = new IPEndPoint(new IPAddress(reader.ReadBytes(4)), reader.ReadInt16()); Target.Address.Port = address.Port; Logger.Debug("redirect to {0}",address.ToString()); Handler.FarProtocol.IOHandler.Socket.Connect(Target.Address); _handshake(); break; case 0x78: FarId = reader.ReadUInt32(); var targetNonce = reader.ReadBytes((int)reader.Read7BitLongValue()); var must58 = reader.ReadByte(); Debug.WriteLineIf(must58!=0x58,$"must58!{must58}"); var key = new byte[RtmfpUtils.KEY_SIZE]; Buffer.BlockCopy(targetNonce, targetNonce.Length - RtmfpUtils.KEY_SIZE, key, 0, RtmfpUtils.KEY_SIZE); var sharedSecret = _dh.CreateSharedKey(key); byte[] decryptKey; byte[] encryptKey; RtmfpUtils.ComputeAsymetricKeys(sharedSecret, _certificat, targetNonce, out encryptKey, out decryptKey); Checked = true; _handshakeTimeoutTimer.Stop(); AesEncrypt = new AESEngine(encryptKey, AESEngine.Direction.ENCRYPT); AesDecrypt = new AESEngine(decryptKey); PrevAesType = AESEngine.AESType.DEFAULT; Application = Handler.Application; Handler.CreateSession(Peer, null); break; default: break; } }