//************************************************************************************
//
// Copyright (c) 2007 Mohammad Sadeq Dousti
// All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, provided that the above
// copyright notice(s) and this permission notice appear in all copies of
// the Software and that both the above copyright notice(s) and this
// permission notice appear in supporting documentation.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT
// OF THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
// HOLDERS INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
// INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
// FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
// NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
// WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
//************************************************************************************

using System;
using System.Collections.Generic;
using System.Text;
using System.Security.Cryptography;
using System.IO;

class Program
{
    static void Main(string[] args)
    {
        //When creating a DES cipher, .NET sets its Key and IV to random values.
        DES des = DES.Create();

        /*
         * You may set your own Key and IV as follows:
         * des.Key = new byte[] { 0xBE, 0xC9, 0x52, 0x01, 0x96, 0x18, 0xE1, 0xAB };
         * des.IV = new byte[] { 0x8E, 0x2F, 0xCB, 0xFC, 0x92, 0xE9, 0x96, 0xAF };
         */

        //Set operating mode to ECB; default mode is CBC
        des.Mode = CipherMode.ECB;

        //Set padding algorithm to none; default mode is PKCS7
        des.Padding = PaddingMode.None;

        //DES plain texts are 64 bits (8 bytes)
        byte[] plain = new byte[8];
        
        // Create a random number generator to fill plain text with random data
        RandomNumberGenerator rng = RandomNumberGenerator.Create();
        rng.GetBytes(plain);

        //Please refer to MSDN to see what the heck is going on here ;)
        MemoryStream ms= new MemoryStream();
        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
        cs.Write(plain, 0, plain.Length);
        cs.Close();

        byte[] cipher = ms.ToArray();

        ms.Close();

        Console.WriteLine("Plaintext:\t{0}", BitConverter.ToString(plain));
        Console.WriteLine("Key:\t\t{0}", BitConverter.ToString(des.Key));
        Console.WriteLine("Ciphertext:\t{0}", BitConverter.ToString(cipher));
        
        // Release resources!
        des.Clear();
    }
}