private void ProcessClient()
{
ExchangeAgent = new DiffieHellmanKeyExchange(ppk, pbn, pk);
client.Send(Encoding.ASCII.GetBytes("100 " + ExchangeAgent.midkey.ToString("X")));
Thread.Sleep(100);
client.Send(Encoding.ASCII.GetBytes("120 " + ExchangeAgent.n.ToString("X")));
Thread.Sleep(100);
client.Send(Encoding.ASCII.GetBytes("130 " + ExchangeAgent.g.ToString("X")));
client.Send(Encoding.ASCII.GetBytes(""));
try {
while (true)
{
byte[] data = new byte[1024];
int size = client.Receive(data);
if (size == 0)
{
PrintLine("Connection Closed...\n", ok_color);
break;
}
var incomingdata = "";
for (int i = 0; i < size; i++)
{
incomingdata += Convert.ToChar(data[i]).ToString();
}
if (EnableEncryption)
{
incomingdata = ExchangeAgent.Decrypt(incomingdata);
PrintLine("Client : " + incomingdata + "\n", re_message);
playNewMessage();
}
else
{
if (incomingdata.Substring(0, 3) == "100")
{
ExchangeAgent.CalculatePrivateKey(
BigInteger.Parse(
incomingdata.Substring(4, incomingdata.Length - 4),
System.Globalization.NumberStyles.HexNumber
));
EnableEncryption = true;
PrintLine("Secure Connection Ready...\n\n", ok_color);
playSuccess();
}
else
{
PrintLine("Unsecure : Client : " + incomingdata + "\n", er_color);
playNewMessage();
}
}
}
} catch (System.Net.Sockets.SocketException e) {
PrintLine("Closed Connection...\n", er_color);
}
}
public void Connect()
{
var client = new TcpClient();
client.Connect(servername, port); // Connect to the server
networkStream = client.GetStream();
var reader = new StreamReader(networkStream, Encoding.UTF8);
string g = null;
string n = null;
string midkey = null;
PrintLine("Connecting to server...\n", color: ok_color);
while (true)
{
byte[] data = new byte[1024];
int size = networkStream.Read(data, 0, 1024);
var incomingdata = "";
for (int i = 0; i < size; i++) // Convert the ByteStream into a string... or something...
{
incomingdata += Convert.ToChar(data[i]).ToString();
}
if (EnableEncryption) // if the encryption is enabled, then decrypt it before processeding...
{
incomingdata = ExchangeAgent.Decrypt(incomingdata);
PrintLine("Server : " + incomingdata + "\n", color: re_message);
playNewMessage();
}
else
{
if (String.IsNullOrWhiteSpace(incomingdata))
{
continue;
}
var substr = "";
var inc_data = "";
try {
substr = incomingdata.Substring(0, 3);
inc_data = incomingdata.Substring(4, incomingdata.Length - 4);
} catch { }
if (substr == "100") // if the header is 100 its a public key
{
midkey = inc_data;
PrintLine("Received Public Key...\n", color: ok_color);
}
else if (substr == "120") // if its 120 its the public large key
{
n = inc_data;
PrintLine("Recieved Large Key...\n", color: ok_color);
}
else if (substr == "130") // if its 130 its the public prime key
{
g = inc_data;
PrintLine("Recieved Public Prime Key...\n", color: ok_color);
}
else // otherwise, just print the data
{
PrintLine("Unsecure : Server : " + incomingdata, color: er_color);
}
if ((g != null) && (n != null) && (midkey != null)) // if all needed components are collected, Enable encryption...
{
PrintLine("Sending Public Key...\n", color: ok_color);
ExchangeAgent = new DiffieHellmanKeyExchange(
Int32.Parse(g, System.Globalization.NumberStyles.HexNumber),
BigInteger.Parse(n, System.Globalization.NumberStyles.HexNumber),
private_key_p
);
Send("100 " + ExchangeAgent.midkey.ToString("X"), false); // and send local public key
ExchangeAgent.CalculatePrivateKey(BigInteger.Parse(midkey, System.Globalization.NumberStyles.HexNumber));
EnableEncryption = true;
PrintLine("Connection successful...\n\n", color: ok_color);
playSuccess();
}
}
}
}