private static void Execute(TcpClient client)
{
string RSA = "RSA";
string DSA = "DSA";
byte[] byteRecord = new byte[bufferSize];
string dataReceive = null;
string data = null;
string information = "";
int lengthByteRecord = 0;
Boolean flag = true;
NetworkStream stream = client.GetStream();
try
{
Console.WriteLine("Client {0} is connected", client.Client.RemoteEndPoint);
while (flag)
{
lengthByteRecord = stream.Read(byteRecord, 0, byteRecord.Length);
dataReceive = Encoding.UTF8.GetString(byteRecord, 0, lengthByteRecord);
string[] split = dataReceive.Split(new Char[] { ':' });
dataReceive = split[0];
data = split[1];
if (dataReceive.IndexOf("message") > -1)
{
Console.WriteLine("Server received message");
string[] message = data.Split(new Char[] { ' ' });
if (String.Compare(message[message.Length - 1], RSA) == 0)
{
string text = message[0];
string ESD = message[1];
int d = Convert.ToInt32(message[2]);
int n = Convert.ToInt32(message[3]);
string hashAlgorithm = message[4];
string hash = RSAProvider.Dedoce(ESD, d, n);
if (hash.CompareTo(text) == 0)
{
information += "hash: " + text + ";";
information += "ESD: " + ESD + ";";
information += "size ESD: " + ESD.Length + " bites;";
information += "hash Algorithm: " + hashAlgorithm + ";";
information += "size hash: " + text.Length + " bytes";
Console.WriteLine("Server authentication the message");
Console.WriteLine("Encryption algorithm - RSA");
}
else
{
Console.WriteLine("Server does not authenticate the message");
Console.WriteLine("Encryption algorithm - RSA");
}
}
if (String.Compare(message[message.Length - 1], DSA) == 0)
{
string text = message[0];
string ESD = message[1];
int q = Convert.ToInt32(message[2]);
int y = Convert.ToInt32(message[3]);
int g = Convert.ToInt32(message[4]);
string hashAlgorithm = message[5];
int p = DSAProvider.CalculateP(q);
bool result = DSAProvider.DecodeAndEqual(text, p, q, y, g, ESD);
if (result)
{
information += "hash: " + text + ";";
information += "ESD: " + ESD + ";";
information += "size ESD: " + ESD.Length + " bites;";
information += "hash Algorithm: " + hashAlgorithm + ";";
information += "size hash: " + text.Length + " bytes";
Console.WriteLine("Server authentication the message");
Console.WriteLine("Encryption algorithm - DSA");
}
else
{
Console.WriteLine("Server does not authenticate the message");
Console.WriteLine("Encryption algorithm - DSA");
}
}
}
else if (dataReceive.IndexOf("information") > -1)
{
Console.WriteLine("Server received a request for information");
byteRecord = Encoding.UTF8.GetBytes(information);
stream.Write(byteRecord, 0, byteRecord.Length);
Console.WriteLine("Server sent information to request");
}
else if (dataReceive.IndexOf("exit") > -1)
{
Console.WriteLine("Server received a request for disconnecting client");
flag = false;
}
}
Console.WriteLine("Client {0} is disconnected", client.Client.RemoteEndPoint);
}
catch (Exception e)
{
Console.WriteLine(e + "\n\n" + e.Message);
Console.ReadLine();
flag = false;
}
}
