/// <summary>
/// IMPORTANTE: a cada RECEÇÃO deve seguir-se, obrigatóriamente, um ENVIO de dados
/// IMPORTANT: each network .Read() must be fallowed by a network .Write()
/// </summary>
static void Main(string[] args)
{
byte[] msg;
IPEndPoint serverEndPoint;
TcpClient client = null;
NetworkStream netStream = null;
ProtocolSI protocol = null;
TripleDESCryptoServiceProvider tripleDES = null;
SymmetricsSI symmetricsSI = null;
RSACryptoServiceProvider rsaClient = null;
RSACryptoServiceProvider rsaServer = null;
try {
Console.WriteLine("CLIENT");
#region Definitions
// Client/Server Protocol to SI
protocol = new ProtocolSI();
// Defenitions for TcpClient: IP:port (127.0.0.1:9999)
serverEndPoint = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 9999);
// algoritmo simétrico a usar
tripleDES = new TripleDESCryptoServiceProvider();
symmetricsSI = new SymmetricsSI(tripleDES);
rsaClient = new RSACryptoServiceProvider();
rsaServer = new RSACryptoServiceProvider();
if (File.Exists(FILENAME_PUBLIC_PRIVATE_KEY))
{
rsaClient.FromXmlString(File.ReadAllText(FILENAME_PUBLIC_PRIVATE_KEY));
}
else
{
File.WriteAllText(FILENAME_PUBLIC_PRIVATE_KEY, rsaClient.ToXmlString(true));
}
#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 Key
// partilhar a chave publica do cliente com o servidor
Console.Write("Sending client public key .. ");
msg = protocol.Make(ProtocolSICmdType.PUBLIC_KEY, rsaClient.ToXmlString(false));
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok");
Console.WriteLine($"client public key = {rsaClient.ToXmlString(false)}");
// receber a chave publica do servidor
Console.Write("Waiting server public key .. ");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
rsaServer.FromXmlString(protocol.GetStringFromData());
Console.WriteLine("ok");
Console.WriteLine($"server public key = {protocol.GetStringFromData()}");
#endregion
#region Exchange Secret Key
// Send key...
Console.Write("Sending key... ");
msg = protocol.Make(ProtocolSICmdType.SECRET_KEY, rsaServer.Encrypt(tripleDES.Key, true));
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok.");
Console.WriteLine("Key: " + ProtocolSI.ToHexString(tripleDES.Key));
// Receive ack from server
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(tripleDES.IV, true));
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok.");
Console.WriteLine("IV: " + ProtocolSI.ToHexString(tripleDES.IV));
// Receive ack from server
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!!!");
byte[] encryptedData = symmetricsSI.Encrypt(clearData);
Console.Write("Sending data... ");
msg = protocol.Make(ProtocolSICmdType.DATA, encryptedData);
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok.");
Console.WriteLine("Data to encrypt.... (STR): {0}", ProtocolSI.ToString(clearData));
Console.WriteLine("Data to encrypt.... (HEX): {0}", ProtocolSI.ToHexString(clearData));
Console.WriteLine("Encrypted data sent (HEX): {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
} catch (Exception ex) {
Console.WriteLine(SEPARATOR);
Console.WriteLine("Exception: {0}", ex.ToString());
} finally {
if (tripleDES != null)
{
tripleDES.Dispose();
}
// 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();
}
/// <summary>
/// IMPORTANTE: a cada RECEÇÃO deve seguir-se, obrigatóriamente, um ENVIO de dados
/// IMPORTANT: each network .Read() must be fallowed by a network .Write()
/// </summary>
static void Main(string[] args)
{
byte[] msg;
IPEndPoint listenEndPoint;
TcpListener server = null;
TcpClient client = null;
NetworkStream netStream = null;
ProtocolSI protocol = null;
TripleDESCryptoServiceProvider tripleDES = null;
SymmetricsSI symmetricsSI = null;
RSACryptoServiceProvider rsaClient = null;
RSACryptoServiceProvider rsaServer = null;
try {
Console.WriteLine("SERVER");
#region Definitions
// Binding IP/port
listenEndPoint = new IPEndPoint(IPAddress.Any, 9999);
// Client/Server Protocol to SI
protocol = new ProtocolSI();
// algoritmo simétrico a usar
tripleDES = new TripleDESCryptoServiceProvider();
symmetricsSI = new SymmetricsSI(tripleDES);
rsaClient = new RSACryptoServiceProvider();
rsaServer = new RSACryptoServiceProvider();
if (File.Exists(FILENAME_PUBLIC_PRIVATE_KEY))
{
rsaServer.FromXmlString(File.ReadAllText(FILENAME_PUBLIC_PRIVATE_KEY));
}
else
{
File.WriteAllText(FILENAME_PUBLIC_PRIVATE_KEY, rsaServer.ToXmlString(true));
}
#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 Exchange Public Key
// receber a chave publica do cliente
Console.Write("Waiting client public key .. ");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
rsaClient.FromXmlString(protocol.GetStringFromData());
Console.WriteLine("ok");
Console.WriteLine($"client public key = {protocol.GetStringFromData()}");
// partilhar a chave publica do servidor com o cliente
Console.Write("Sending server public key .. ");
msg = protocol.Make(ProtocolSICmdType.PUBLIC_KEY, rsaServer.ToXmlString(false));
netStream.Write(msg, 0, msg.Length);
Console.WriteLine("ok");
Console.WriteLine($"server public key = {rsaServer.ToXmlString(false)}");
#endregion
#region Exchange Secret Key
// Receive the key
Console.Write("waiting for key... ");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
tripleDES.Key = rsaServer.Decrypt(protocol.GetData(), true);
Console.WriteLine("ok.");
Console.WriteLine("Received: {0}", ProtocolSI.ToHexString(tripleDES.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 the iv
Console.Write("waiting for iv... ");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
tripleDES.IV = rsaServer.Decrypt(protocol.GetData(), true);
Console.WriteLine("ok.");
Console.WriteLine("Received: {0}", ProtocolSI.ToHexString(tripleDES.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 data
Console.Write("waiting for data... ");
netStream.Read(protocol.Buffer, 0, protocol.Buffer.Length);
byte[] data = symmetricsSI.Decrypt(protocol.GetData());
Console.WriteLine("ok.");
Console.WriteLine("Encrypted data received (HEX): {0}", ProtocolSI.ToHexString(protocol.GetData()));
Console.WriteLine("Decrypted data......... (HEX): {0}", ProtocolSI.ToHexString(data));
Console.WriteLine("Decrypted data......... (STR): {0}", ProtocolSI.ToString(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
} 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();
}