Cryp Data Sender : Crypto Connection : Network C# Source Code

    

/*
C# Network Programming 
by Richard Blum

Publisher: Sybex 
ISBN: 0782141765
*/

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Soap;
using System.Security;
using System.Security.Cryptography;
using System.Text;

public class CryptoDataSender
{
   private void SendData(NetworkStream strm, SerialEmployee emp)
   {
      IFormatter formatter = new SoapFormatter();
      MemoryStream memstrm = new MemoryStream();

      byte[] Key = {0x01, 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.CreateEncryptor(Key, IV), CryptoStreamMode.Write);

      formatter.Serialize(csw, emp);
      csw.FlushFinalBlock();
      byte[] data = memstrm.GetBuffer();
      int memsize = (int)memstrm.Length;
      byte[] size = BitConverter.GetBytes(memsize);
      strm.Write(size, 0, 4);
      strm.Write(data, 0, (int)memsize);
      strm.Flush();
      csw.Close();
      memstrm.Close();
   }

   public CryptoDataSender()
   {
      SerialEmployee emp1 = new SerialEmployee();
      SerialEmployee emp2 = new SerialEmployee();

      emp1.EmployeeID = 1;
      emp1.LastName = "Blum";
      emp1.FirstName = "Katie Jane";
      emp1.YearsService = 12;
      emp1.Salary = 35000.50;

      emp2.EmployeeID = 2;
      emp2.LastName = "Blum";
      emp2.FirstName = "Jessica";
      emp2.YearsService = 9;
      emp2.Salary = 23700.30;

      TcpClient client = new TcpClient("127.0.0.1", 9050);
      NetworkStream strm = client.GetStream();

      SendData(strm, emp1);
      SendData(strm, emp2);
      strm.Close();
      client.Close();
   }

   public static void Main()
   {
      CryptoDataSender cds = new CryptoDataSender();
   }
}


[Serializable]
public class SerialEmployee
{
   public int EmployeeID;
   public string LastName;
   public string FirstName;
   public int YearsService;
   public double Salary;

   public SerialEmployee()
   {
      EmployeeID = 0;
      LastName = null;
      FirstName = null;
      YearsService = 0;
      Salary = 0.0;
   }
}