NetPro'09 - SecureRecv

[Nati]

using System;

using System.IO;

using System.Net;

using System.Net.Sockets;

using System.Security;

using System.Security.Cryptography;

using System.Text;

namespace SecureRecv

{

    class Program

    {

        static void Main(string[] args)

        {

            TcpListener server = new TcpListener(IPAddress.Parse("127.0.0.1"),9050);

            server.Start();

            Console.WriteLine("Waiting for a client...");

            TcpClient client = server.AcceptTcpClient();

            NetworkStream strm = client.GetStream();

            string str = RecvData(strm);

            Console.WriteLine(str);

            strm.Close();

            server.Stop();

        }

        private static string RecvData(NetworkStream strm)

        {

            MemoryStream memstrm = new MemoryStream();

            byte[] Key = {0x02, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,

          0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};

            byte[] IV = {0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,

          0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16};

            TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();

            CryptoStream csw = new CryptoStream(memstrm, tdes.CreateDecryptor(Key, IV),

                      CryptoStreamMode.Write);

            byte[] data = new byte[2048];

            //int recv = strm.Read(data, 0, 4);

            //int size = BitConverter.ToInt32(data, 0);

            //int offset = 0;

            //while (size > 0)

            {

                int recv = strm.Read(data, 0, data.Length);

                csw.Write(data, 0, recv);

                //offset += recv;

                //size -= recv;

            }

            csw.FlushFinalBlock();

            memstrm.Position = 0;

            string emp = Encoding.ASCII.GetString(memstrm.GetBuffer(),0,(int)memstrm.Length);

            memstrm.Close();

            return emp;

        }  

    }

}