MonoTorrent.Client.ConnectionManager.EndCheckEncryption C# (CSharp) Method

        private void EndCheckEncryption(IAsyncResult result)
        {
            PeerId id = (PeerId)result.AsyncState;
            byte[] initialData;
            try
            {
                EncryptorFactory.EndCheckEncryption(result, out initialData);
                if (initialData != null && initialData.Length > 0)
                    throw new EncryptionException("unhandled initial data");

                EncryptionTypes e = engine.Settings.AllowedEncryption;
                if (id.Encryptor is RC4 && !Toolbox.HasEncryption(e, EncryptionTypes.RC4Full) ||
                    id.Encryptor is RC4Header && !Toolbox.HasEncryption(e, EncryptionTypes.RC4Header) ||
                    id.Encryptor is PlainTextEncryption && !Toolbox.HasEncryption(e, EncryptionTypes.PlainText))
                {
                    CleanupSocket(id, id.Encryptor.GetType().Name + " encryption is not enabled");
                }
                else
                {
                    // Create a handshake message to send to the peer
                    HandshakeMessage handshake = new HandshakeMessage(id.TorrentManager.InfoHash, engine.PeerId, VersionInfo.ProtocolStringV100);
                    SendMessage(id, handshake, this.handshakeSentCallback);
                }
            }
            catch
            {
                id.Peer.Encryption &= ~EncryptionTypes.RC4Full;
                id.Peer.Encryption &= ~EncryptionTypes.RC4Header;
                CleanupSocket(id, "Failed encryptor check");
            }
        }