using System;

using System.IO;

using System.Security.Cryptography;

using System.Text;

​

public static class CryptMPM

    {

        private static string INIT_VECTOR = "aUCCRX775iuX2W2m";

        private static string PASS_PHRASE = "mPmS0fTw4R3";

        private static string SALT_VALUE = "H4rD3gU4r3";

​

        public static string Decrypt(string value)

        {

            string str = "";

            ICryptoTransform transform = null;

            MemoryStream stream = null;

            CryptoStream stream2 = null;

            try

            {

                byte[] bytes = Encoding.ASCII.GetBytes(INIT_VECTOR);

                byte[] rgbSalt = Encoding.ASCII.GetBytes(SALT_VALUE);

                byte[] buffer = Convert.FromBase64String(value);

                byte[] rgbKey = new PasswordDeriveBytes(PASS_PHRASE, rgbSalt, "SHA1", 2).GetBytes(0x20);

                transform = new RijndaelManaged

                {

                    Mode = CipherMode.CBC,

                    Padding = PaddingMode.PKCS7

                }.CreateDecryptor(rgbKey, bytes);

                stream = new MemoryStream(buffer);

                stream2 = new CryptoStream(stream, transform, CryptoStreamMode.Read);

                byte[] buffer5 = new byte[buffer.Length];

                int count = stream2.Read(buffer5, 0, buffer5.Length);

                str = Encoding.UTF8.GetString(buffer5, 0, count);

            }

            catch

            {

            }

            finally

            {

                if ((stream2 != null) && (str != ""))

                {

                    stream2.Close();

                }

                if (stream != null)

                {

                    stream.Close();

                }

            }

            return str;

        }

​

        public static string Encrypt(string value)

        {

            string str = "";

            PasswordDeriveBytes bytes = null;

            ICryptoTransform transform = null;

            MemoryStream stream = null;

            CryptoStream stream2 = null;

            try

            {

                byte[] rgbIV = Encoding.ASCII.GetBytes(INIT_VECTOR);

                byte[] rgbSalt = Encoding.ASCII.GetBytes(SALT_VALUE);

                byte[] buffer = Encoding.UTF8.GetBytes(value);

                bytes = new PasswordDeriveBytes(PASS_PHRASE, rgbSalt, "SHA1", 2);

                transform = new RijndaelManaged

                {

                    Mode = CipherMode.CBC,

                    Padding = PaddingMode.PKCS7

                }.CreateEncryptor(bytes.GetBytes(0x20), rgbIV);

                stream = new MemoryStream();

                stream2 = new CryptoStream(stream, transform, CryptoStreamMode.Write);

                stream2.Write(buffer, 0, buffer.Length);

                stream2.FlushFinalBlock();

                str = Convert.ToBase64String(stream.ToArray());

            }

            catch

            {

            }

            finally

            {

                if (stream2 != null)

                {

                    stream2.Close();

                }

                if (stream != null)

                {

                    stream.Close();

                }

            }

            return str;

        }

    }

public class Program

{

    public static void Main()

    {

        Console.WriteLine(CryptMPM.Encrypt("volkswagen")); //wPOJvd0tuc46NOie/mv9TQ==

        Console.WriteLine(CryptMPM.Decrypt("wPOJvd0tuc46NOie/mv9TQ=="));

        Console.WriteLine(CryptMPM.Encrypt("00064")); //L6wcrEQKjQnZSzc8qlb64Q==

        Console.WriteLine(CryptMPM.Decrypt("L6wcrEQKjQnZSzc8qlb64Q=="));

    }

}