using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        Console.WriteLine(encodePassword("12345678901234567890123456789012", "passwordToBeconverted"));

    }

    public static string encodePassword(string salt, string pass)

    {

    pass = mod4(pass);  /// Necesitamos que la cadena sea multiplo de 4

    pass = Convert.ToBase64String(Encoding.UTF8.GetBytes(pass));

    pass += salt;

    pass = mod4(pass);

    pass = Convert.ToBase64String(Encoding.UTF8.GetBytes(pass));

    return pass;

    }

​

    private static string mod4(string a)

    {

        int mod4 = a.Length % 4;

        if (mod4 > 0)

        {

            a += new string('=', 4 - mod4);

        }

        return a;

    }

}