using System;

using System.IO;

using System.Text;

using System.Security.Cryptography;

public class Program

{

    public static void Main()

    {

        var key = "tDXEZtNOVbBuNU8tK27Rl/oE7bbAQquC";       

        var iv = CreateIv();

        Console.WriteLine("Key: {0}", key);

        Console.WriteLine("IV: {0}", iv);

        var userPass = "username=jwtest10&password=!!";

        var encrypted = Encrypt(userPass, key, iv);

        Console.WriteLine(encrypted);

        var decrypted = Decrypt(encrypted, key, iv);

        Console.WriteLine(decrypted);

    }   

    private static string CreateKey()

    {

        var provider = new TripleDESCryptoServiceProvider();

        provider.GenerateKey();

        return Convert.ToBase64String(provider.Key);

    }

    private static string CreateIv()

    {

        var provider = new TripleDESCryptoServiceProvider();

        provider.GenerateIV();

        return Convert.ToBase64String(provider.IV);

    }

​

    //========================================

    private static string Encrypt(string data, string key, string iv)

    {

        var bytes = Encoding.UTF8.GetBytes(data);

        var provider = new TripleDESCryptoServiceProvider();

        provider.Padding = PaddingMode.PKCS7;

        provider.Mode = CipherMode.ECB;

        provider.Key = Convert.FromBase64String(key);

        provider.IV = Convert.FromBase64String(iv);

        var transform = provider.CreateEncryptor();

        var resultArray = transform.TransformFinalBlock(bytes, 0, bytes.Length);

        provider.Clear();

        return Convert.ToBase64String(resultArray, 0, resultArray.Length);

    }

    private static string Decrypt(string data, string key, string iv)

    {

        var bytes = Convert.FromBase64String(data);

        var provider = new TripleDESCryptoServiceProvider();

        provider.Padding = PaddingMode.PKCS7;

        provider.Mode = CipherMode.ECB;

        provider.Key = Convert.FromBase64String(key);

        provider.IV = Convert.FromBase64String(iv);

        var transform = provider.CreateDecryptor();

        var resultArray = transform.TransformFinalBlock(bytes, 0, bytes.Length);              

        provider.Clear();

        return UTF8Encoding.UTF8.GetString(resultArray);

    }

}