protected override byte[] OnBeforeSendPacket(byte[] body, bool encrypt, bool compress, Pointer bodyPointer)
{
if (encrypt && m_ConnectionKey.Length > 0)
{
// Log.LogMsg("Pre Encryption packet size " + body.Length.ToString());
body = CryptoManager.RijEncrypt(body, 0, bodyPointer.Position, m_ConnectionKey);
// Log.LogMsg("Encrypted packet size " + body.Length.ToString());
bodyPointer.Position = body.Length;
}
if (compress)
{
body = Compression.CompressData(body, bodyPointer);
}
return(body);
}
/// <summary>
/// Encryption helper method.
/// </summary>
private void OnRijndaelExchange(INetworkConnection con, Packet pck)
{
PacketRijndaelExchange msg = pck as PacketRijndaelExchange;
try
{
m_ConnectionKey = CryptoManager.DecryptRijndaelKey(msg.RijndaelExchangeData);
PacketLineSecured p = (PacketLineSecured)CreatePacket((int)PacketType.LineSecured, 0, false, true);
p.Key = CryptoManager.RijEncrypt(m_ConnectionKey, 0, m_ConnectionKey.Length, m_ConnectionKey);
p.ReplyCode = ReplyType.OK;
msg.ReplyPacket = p;
RemoteRsaKey = msg.PublicRSAKey;
}
catch (Exception e)
{
KillConnection("Encryption key exchange error. Disconnecting client connection. " + e.Message);
}
}
private void OnRijndaelExchangeRequest(INetworkConnection con, Packet msg)
{
PacketRijndaelExchangeRequest p = msg as PacketRijndaelExchangeRequest;
// Server said hello. Generate, encrypt with public RSA key and finally send the key. this will be our
// connection key for as long as this connection is valid
// Generate & Store new key
m_ConnectionKey = CryptoManager.GetRandomRijndaelKey();
RemoteRsaKey = p.PublicRSAKey;
// Encrypt it with the public RSA key from the server
byte[] encryptedKey = CryptoManager.EncryptRijndaelKey(p.PublicRSAKey, m_ConnectionKey);
// Send it
PacketRijndaelExchange re = (PacketRijndaelExchange)CreatePacket((int)PacketType.RijndaelExchange, 0, false, false);
re.RijndaelExchangeData = encryptedKey;
re.PublicRSAKey = CryptoManager.PublicRSAKey;
re.ReplyCode = m_ConnectionKey != null && m_ConnectionKey.Length > 0 ? ReplyType.OK : ReplyType.Failure;
re.ReplyPacketType = msg.PacketTypeID;
re.ReplyPacketID = msg.PacketID;
msg.ReplyPacket = re;
}