using System;

using System.Security.Cryptography;

using System.IO;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("ENcrypted: " + Encrypt("mk00848558@techmahindra.com#d7406010-0461-472f-8f8a-733e0fa5a3c9"));             

        //Console.WriteLine("Decrypted: " + Decrypt("uJkT2odyE///lCbEB43XvjGoKmpfLnj1eqwgvPB/t3tNK90v/gEq9O0uJC2Np4Gfor1LTaQ3GCnWKKvOwvrTWTlgcQrh3nrN"));

    }

​

    // This constant string is used as a "salt" value for the PasswordDeriveBytes function calls.

    // This size of the IV (in bytes) must = (keysize / 8).  Default keysize is 256, so the IV must be

    // 32 bytes long.  Using a 16 character string here gives us 32 bytes when converted to a byte array.

    // ^ all of that is completely wrong.

    // 16 Characters in ascii is 16 bytes. Each character is 1 byte in ASCII. 

    // our "initvector" is used in our AES (Rijndael) encryption function only. 

    // it also shouldn't have been a constant variable but hey who needs security anyways.

    private const string initVector = "h7g3e4m3t5st5zjw";

    // This constant is used to determine the keysize of the encryption algorithm.

    private const int keysize = 256;

    public static string Decrypt(string str)

        {

            if (string.IsNullOrEmpty(str))

            {

                return null;

            }

            str = str.Replace(" ", "+");

            string DecryptKey = "2013;[pnuLIT)WebCodeExpert";

            byte[] byKey = { };

            byte[] IV = { 18, 52, 86, 120, 144, 171, 205, 239 };

            byte[] inputByteArray = new byte[str.Length];

​

            byKey = System.Text.Encoding.UTF8.GetBytes(DecryptKey.Substring(0, 8));

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            inputByteArray = Convert.FromBase64String(str.Replace(" ", "+"));

            MemoryStream ms = new MemoryStream();

            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);

            cs.FlushFinalBlock();

            System.Text.Encoding encoding = System.Text.Encoding.UTF8;

            return encoding.GetString(ms.ToArray());

        }

    public static string Encrypt(string str)

        {

            if (string.IsNullOrEmpty(str))

            {

                return null;

            }

            string EncrptKey = "2013;[pnuLIT)WebCodeExpert";

            byte[] byKey = { };

            byte[] IV = { 18, 52, 86, 120, 144, 171, 205, 239 };

            byKey = System.Text.Encoding.UTF8.GetBytes(EncrptKey.Substring(0, 8));

            DESCryptoServiceProvider des = new DESCryptoServiceProvider();

            byte[] inputByteArray = Encoding.UTF8.GetBytes(str);

            MemoryStream ms = new MemoryStream();

            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);

            cs.Write(inputByteArray, 0, inputByteArray.Length);

            cs.FlushFinalBlock();

            return Convert.ToBase64String(ms.ToArray());

​

        }

}