private byte[] ReceiveData(Socket handler)
{
RSACryptoServiceProvider cryptoProvider = InitializeAsymmetricCyphering();
byte[] publicKey = cryptoProvider.ExportCspBlob(false);
handler.Send(publicKey);
byte[] encryptedSymmetricKey = new byte[512];
handler.Receive(encryptedSymmetricKey);
byte[] encryptedData = DataExtensions.ReceiveMessageBySocket(handler);
byte[] symmetricKey = cryptoProvider.Decrypt(encryptedSymmetricKey, RSAEncryptionPadding.Pkcs1);
cryptoProvider.Dispose();
return(encryptedData.Decrypt(symmetricKey).Decompress());
}
public override void Send(byte[] data)
{
IPEndPoint remoteEP = new IPEndPoint(serverIpAddress, serverPort);
byte[] encryptedData = data.Compress().Encrypt(out byte[] symmetricKey);
using (Socket client = new Socket(serverIpAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp)
{
ReceiveTimeout = 10000,
SendTimeout = 10000
})
{
client.Connect(remoteEP);
byte[] publicKey = DataExtensions.ReceiveMessageBySocket(client);
if (publicKey.Length == 0)
{
throw new ExchangeException();
}
byte[] encryptedSymmetricKey = EncodeSymmetricKey(symmetricKey, publicKey);
client.Send(encryptedSymmetricKey);
client.Send(encryptedData);
client.Shutdown(SocketShutdown.Both);
}
}