private static void ExchangeKeys(object state)
{
byte num = 0;
KeyExchangeParameter parameter = (KeyExchangeParameter)state;
DiffieHellmanKeyExchange exchange = null;
try
{
exchange = new DiffieHellmanKeyExchange();
num = 1;
exchange.DeriveSharedKey(parameter.ClientPublicKey);
parameter.PublicKey = exchange.PublicKey;
parameter.SharedKey = exchange.SharedKey;
}
catch (ThreadAbortException)
{
if (log.IsWarnEnabled)
{
string message = string.Format("Key exchange was aborted\r\nstep={0}\r\nClientKey={1}", num, (parameter.ClientPublicKey == null) ? "{null}" : BitConverter.ToString(parameter.ClientPublicKey));
if (exchange != null)
{
message = message + string.Format("\r\nSecret={0}\r\nPrime={1}\r\nPublicKey={2}\r\nSharedKey={3}", new object[] { (exchange.Secret == null) ? "{null}" : exchange.Secret.ToString(), (exchange.Prime == null) ? "{null}" : exchange.Prime.ToString(), (exchange.PublicKey == null) ? "{null}" : BitConverter.ToString(exchange.PublicKey), (exchange.SharedKey == null) ? "{null}" : BitConverter.ToString(exchange.SharedKey) });
}
log.Warn(message);
}
}
}
public byte[] InitializeEncryption(byte[] otherPartyPublicKey, EncryptionMethod mode)
{
KeyExchangeParameter parameter = new KeyExchangeParameter
{
ClientPublicKey = otherPartyPublicKey
};
Thread thread = new Thread(new ParameterizedThreadStart(PeerBase.ExchangeKeys));
thread.Start(parameter);
if (!thread.Join(0x7d0))
{
thread.Abort();
return(null);
}
switch (mode)
{
case EncryptionMethod.Sha256Pkcs7:
byte[] buffer;
using (SHA256 sha = SHA256.Create())
{
buffer = sha.ComputeHash(parameter.SharedKey);
}
if (log.IsDebugEnabled)
{
log.DebugFormat("InitializeEncryption: conId={0}, HashMode=SHA256, Paddin=PKCS7", new object[] { this.UnmanagedPeer.GetConnectionID() });
}
this.CryptoProvider = new RijndaelCryptoProvider(buffer, PaddingMode.PKCS7);
break;
case EncryptionMethod.Md5Iso10126:
byte[] buffer2;
using (MD5 md = MD5.Create())
{
buffer2 = md.ComputeHash(parameter.SharedKey);
}
if (log.IsDebugEnabled)
{
log.DebugFormat("InitializeEncryption: conId={0}, HashMode=MD5, Paddin=ISO10126", new object[] { this.UnmanagedPeer.GetConnectionID() });
}
this.CryptoProvider = new RijndaelCryptoProvider(buffer2, PaddingMode.ISO10126);
break;
default:
throw new ArgumentOutOfRangeException("mode", "Invalid mode specified. Mode must be between 0 and 1");
}
return(parameter.PublicKey);
}
