private void IWriteNetClientConnect(plBufferedStream s, byte[] seed)
{
s.WriteByte(plNetCore.kNetCliConnect);
s.WriteByte(66);
s.WriteBytes(seed);
s.Flush();
}
protected bool SetupEncryption(byte[] pubKey, byte[] privKey)
{
NetworkStream ns = new NetworkStream(fSocket, false);
plBufferedStream temp = new plBufferedStream(ns);
byte[] yData = IReadNetCliConnect(temp);
if (yData != null) {
BigNum Y = new BigNum(yData);
BigNum N = new BigNum(pubKey);
BigNum K = new BigNum(privKey);
// Generate some randomness and do Y**K%N to get the key components
byte[] server_seed = RNG.Random(7);
BigNum client_seed = Y.PowMod(K, N);
byte[] seed_data = client_seed.ToLittleArray();
// Grab the first 7 bytes and xor it with some randomness to make our key
byte[] key = new byte[7];
for (int i = 0; i < key.Length; i++)
if (i >= seed_data.Length) key[i] = server_seed[i];
else key[i] = (byte)(seed_data[i] ^ server_seed[i]);
// Final setup
fStream = new plBufferedStream(new pnSocketStream(fSocket, key));
IWriteNetCliEncrypt(temp, server_seed);
// Explicitly clean up some resources so that we don't pressure the GC too much.
// Those explicit finalizers really suck.
Y.Dispose();
N.Dispose();
K.Dispose();
client_seed.Dispose();
} else
// Write the error code to the unencrypted buffer
temp.WriteByte(plNetCore.kNetCliError);
temp.Flush();
temp.Close();
ns.Close();
return (yData != null);
}
