using System;

using System.IO; 

using System.Text;

using System.Security.Cryptography;

​

namespace Rextester {

​

  public class Program {

    public static void Main(string[] args) {

      string val = String.Empty;

      byte[] Key = ASCIIEncoding.UTF8.GetBytes("bzDsoqaIYsJCfjY9DswiTxvGFq3SnShQ");

      byte[] IV = ASCIIEncoding.UTF8.GetBytes("bzDsoqaIYsJCfjY9DswiTxvGFq3SnShQ");

​

      string encrypted = null;

      RijndaelManaged rj = new RijndaelManaged();

      rj.KeySize = 256;

      rj.BlockSize = 256;

      rj.Padding = PaddingMode.Zeros;

      rj.Mode = CipherMode.CBC;

      rj.Key = Key;

      rj.IV = IV;

​

      try {

        MemoryStream ms = new MemoryStream();

​

        using (CryptoStream cs = new CryptoStream(ms, rj.CreateEncryptor(Key, IV), CryptoStreamMode.Write)) {

          using (StreamWriter sw = new StreamWriter(cs)) {

            sw.Write("{\"params\":{\"full_name\":\"Mi nombre\"}}");

            sw.Close();

          }

          cs.Close();

        }

​

        byte[] encoded = ms.ToArray();

        encrypted = Convert.ToBase64String(encoded);

        encrypted = encrypted.Replace("+", "-").Replace("/", "_").TrimEnd(new Char[] {'='});

        ms.Close();

      }

      catch (Exception e) {

        Console.WriteLine("An error occurred: {0}", e.Message);

      }

​

      rj.Clear();

​

      Console.Write("Resultado: ");

      Console.WriteLine(encrypted);

      Console.WriteLine(" Esperado: 2iORZV89GnHnebTjipDjtNU1m-wNk4mesPwU5ww_GdFlo2e77ds-YBpy7bAVm0Lo6kH0qV6TIGZaCkX6xiG3JQ");

    }

  }

}

​