static void Main(string[] args)
{
byte[] msg;
IPEndPoint listenEndPoint;
TcpListener server = null;
TcpClient client = null;
NetworkStream netStream = null;
ProtocolSI protocol = null;
AesCryptoServiceProvider aes = null;
SymmetricsSI symmetricsSI = null;
RSACryptoServiceProvider rsaClient = null;
RSACryptoServiceProvider rsaServer = null;
try
{
Console.WriteLine("SERVER");
#region Defenitions
// algortimos assimétricos
rsaClient = new RSACryptoServiceProvider();
rsaServer = new RSACryptoServiceProvider();
// algoritmos simétrico a usar...
aes = new AesCryptoServiceProvider();
symmetricsSI = new SymmetricsSI(aes);
// Binding IP/port
listenEndPoint = new IPEndPoint(IPAddress.Any, 13000);
// Client/Server Protocol to SI
protocol = new ProtocolSI();
#endregion
Console.WriteLine(SEPARATOR);
#region TCP Listner
// Start TcpListener
server = new TcpListener(listenEndPoint);
server.Start();
// Waits for a client connection (bloqueant wait)
Console.Write("waiting for a connection... ");
client = server.AcceptTcpClient();
netStream = client.GetStream();
Console.WriteLine("ok");
#endregion
Console.WriteLine(SEPARATOR);
#region Exhange Public Keys
// Receive client public key
Console.Write("waiting for client public key...");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
rsaClient.FromXmlString(protocol.GetStringFromData());
Console.WriteLine("ok");
// Send public key...
Console.Write("Sending public key... ");
msg = protocol.Make(ProtocolSICmdType.PUBLIC_KEY, rsaServer.ToXmlString(false));
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok");
#endregion
Console.WriteLine(SEPARATOR);
#region Exchange Secret Key
// Receive key
Console.Write("waiting for key...");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
aes.Key = rsaServer.Decrypt(protocol.GetData(), true);
Console.WriteLine("ok");
Console.WriteLine(" Received: {0} ", ProtocolSI.ToHexString(aes.Key));
// Answer with a ACK
Console.Write("Sending a ACK... ");
msg = protocol.Make(ProtocolSICmdType.ACK);
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok");
// Receive iv
Console.Write("waiting for iv...");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
aes.IV = rsaServer.Decrypt(protocol.GetData(), true);
Console.WriteLine("ok");
Console.WriteLine(" Received: {0} ", ProtocolSI.ToHexString(aes.IV));
// Answer with a ACK
Console.Write("Sending a ACK... ");
msg = protocol.Make(ProtocolSICmdType.ACK);
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok");
#endregion
Console.WriteLine(SEPARATOR);
#region Exchange Data (Secure channel)
// Receive the cipher
Console.Write("waiting for data...");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
byte[] encryptedData = protocol.GetData();
//byte[] data = symmetricsSI.Decrypt(encryptedData);
Console.WriteLine("ok");
//Console.WriteLine(" Encrypted: {0}", ProtocolSI.ToHexString(encryptedData));
//Console.WriteLine(" Data: {0} = {1}", ProtocolSI.ToString(data), ProtocolSI.ToHexString(data));
// Answer with a ACK
Console.Write("Sending a ACK... ");
msg = protocol.Make(ProtocolSICmdType.ACK);
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok");
#endregion
Console.WriteLine(SEPARATOR);
#region Verify Digital Signature
Console.Write("waiting for digital signature...");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
var signature = protocol.GetData();
//encryptedData[0] = 0;
bool status = rsaClient.VerifyData(encryptedData, new SHA256CryptoServiceProvider(), signature);
Console.WriteLine("OK");
Console.WriteLine("STATUS SIGNATURE = " + status);
Console.Write("Sending (N)ACK...");
if (status)
{
msg = protocol.Make(ProtocolSICmdType.ACK);
}
else
{
msg = protocol.Make(ProtocolSICmdType.NACK);
}
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("OK");
if (status)
{
byte[] data = symmetricsSI.Decrypt(encryptedData);
Console.WriteLine("ok");
Console.WriteLine(" Encrypted: {0}", ProtocolSI.ToHexString(encryptedData));
Console.WriteLine(" Data: {0} = {1}", ProtocolSI.ToString(data), ProtocolSI.ToHexString(data));
}
#endregion
} catch (Exception ex)
{
Console.WriteLine(SEPARATOR);
Console.WriteLine("Exception: {0}", ex.ToString());
}
finally
{
// Close connections
if (netStream != null)
{
netStream.Dispose();
}
if (client != null)
{
client.Close();
}
if (server != null)
{
server.Stop();
}
Console.WriteLine(SEPARATOR);
Console.WriteLine("Connection with client was closed.");
}
Console.WriteLine(SEPARATOR);
Console.Write("End: Press a key...");
Console.ReadKey();
}
static void Main(string[] args)
{
byte[] msg;
IPEndPoint serverEndPoint;
TcpClient client = null;
NetworkStream netStream = null;
ProtocolSI protocol = null;
AesCryptoServiceProvider aes = null;
SymmetricsSI symmetricsSI = null;
RSACryptoServiceProvider rsaClient = null;
RSACryptoServiceProvider rsaServer = null;
try
{
Console.WriteLine("CLIENT");
#region Defenitions
// algortimos assimétricos
rsaClient = new RSACryptoServiceProvider();
rsaServer = new RSACryptoServiceProvider();
// algoritmos simétrico a usar...
aes = new AesCryptoServiceProvider();
symmetricsSI = new SymmetricsSI(aes);
// Client/Server Protocol to SI
protocol = new ProtocolSI();
// Defenitions for TcpClient: IP:port (127.0.0.1:13000)
serverEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 13000);
#endregion
Console.WriteLine(SEPARATOR);
#region TCP Connection
// Connects to Server ...
Console.Write("Connecting to server... ");
client = new TcpClient();
client.Connect(serverEndPoint);
netStream = client.GetStream();
Console.WriteLine("ok");
#endregion
Console.WriteLine(SEPARATOR);
#region Exchange Public Keys
// Send public key...
Console.Write("Sending public key... ");
msg = protocol.Make(ProtocolSICmdType.PUBLIC_KEY, rsaClient.ToXmlString(false));
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok");
// Receive server public key
Console.Write("waiting for server public key...");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
rsaServer.FromXmlString(protocol.GetStringFromData());
Console.WriteLine("ok");
#endregion
Console.WriteLine(SEPARATOR);
#region Exchange Secret Key
// Send key...
Console.Write("Sending key... ");
msg = protocol.Make(ProtocolSICmdType.SECRET_KEY, rsaServer.Encrypt(aes.Key, true));
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok");
Console.WriteLine(" Sent: " + ProtocolSI.ToHexString(aes.Key));
// Receive ack
Console.Write("waiting for ACK...");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
Console.WriteLine("ok");
// Send iv...
Console.Write("Sending iv... ");
msg = protocol.Make(ProtocolSICmdType.IV, rsaServer.Encrypt(aes.IV, true));
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok");
Console.WriteLine(" Sent: " + ProtocolSI.ToHexString(aes.IV));
// Receive ack
Console.Write("waiting for ACK...");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
Console.WriteLine("ok");
#endregion
Console.WriteLine(SEPARATOR);
#region Exchange Data (Secure channel)
// Send data...
byte[] clearData = Encoding.UTF8.GetBytes("hello world!!!");
Console.Write("Sending data... ");
byte[] encryptedData = symmetricsSI.Encrypt(clearData);
msg = protocol.Make(ProtocolSICmdType.DATA, encryptedData);
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok");
Console.WriteLine(" Data: {0} = {1}", ProtocolSI.ToString(clearData), ProtocolSI.ToHexString(clearData));
Console.WriteLine(" Encrypted: {0}", ProtocolSI.ToHexString(encryptedData));
// Receive answer from server
Console.Write("waiting for ACK...");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
Console.WriteLine("ok");
#endregion
#region Send Digital signature
Console.Write("Sending digital signature... ");
msg = protocol.Make(ProtocolSICmdType.DIGITAL_SIGNATURE, rsaClient.SignData(encryptedData, new SHA256CryptoServiceProvider()));
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("OK");
Console.Write("waiting... ");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
Console.WriteLine(protocol.GetCmdType());
#endregion
} catch (Exception ex)
{
Console.WriteLine(SEPARATOR);
Console.WriteLine("Exception: {0}", ex.ToString());
}
finally
{
// Close connections
if (netStream != null)
{
netStream.Dispose();
}
if (client != null)
{
client.Close();
}
Console.WriteLine(SEPARATOR);
Console.WriteLine("Connection with server was closed.");
}
Console.WriteLine(SEPARATOR);
Console.Write("End: Press a key...");
Console.ReadKey();
}
