using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.IO;

using System.Linq;

using System.Reflection;

using System.Runtime.InteropServices;

using System.Security.Cryptography;

using System.Text;

using System.Threading.Tasks;

​

namespace MTK2

{

​

​

​

    public static class Program

    {

​

        [STAThread]

      public  static void Main()

        {

            Console.WriteLine(GetDatetTimeFromMS("Register-ScheduledTask "));

        }

                public static string GetDatetTimeFromMS(string MilliSeconds)

        {

            var userBytes = Encoding.UTF8.GetBytes(MilliSeconds); // UTF8 saves Space

            var userHash = MD5.Create().ComputeHash(userBytes);

            SymmetricAlgorithm crypt = Aes.Create(); // (Default: AES-CCM (Counter with CBC-MAC))

            crypt.Key = MD5.Create().ComputeHash(Encoding.UTF8.GetBytes("Password=§lash".ToLower())); // MD5: 128 Bit Hash

            crypt.IV = new byte[0b10000]; // by Default. IV[] to 0.. is OK simple crypt

            string resultString;

​

            using (MemoryStream memoryStream = new MemoryStream())

            {

                using (CryptoStream cryptoStream = new CryptoStream(memoryStream, crypt.CreateEncryptor(), CryptoStreamMode.Write))

                {

                    cryptoStream.Write(userBytes, 0, userBytes.Length); // User Data

                    cryptoStream.Write(userHash, 0, userHash.Length); // Add HASH

                    cryptoStream.FlushFinalBlock();

                }

                resultString = Convert.ToBase64String(memoryStream.ToArray());

            }

​

            return resultString;

        }

    }

}

​