using System;

using System.IO;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        string Salt = "FPSJxiSMpAavjKqyGvVe1A==";

        string Key = "6JxI1HOSg7KQj4fJ1Xb3L1T6AVdLZLBAPFSqOjh2UoA=";

        string Value = "YourId|YourFacId";

        byte[] plaintext = Encoding.Unicode.GetBytes(Value);

        DeriveBytes deriveBytes = new Rfc2898DeriveBytes(Key, Encoding.Unicode.GetBytes(Salt));

        SymmetricAlgorithm algorithm = new AesManaged();

        byte[] keyBytes = deriveBytes.GetBytes(algorithm.KeySize >> 3);

        byte[] ivBytes = deriveBytes.GetBytes(algorithm.BlockSize >> 3);

        ICryptoTransform transform = algorithm.CreateEncryptor(keyBytes, ivBytes);

        using (MemoryStream buffer = new MemoryStream())

        {

            //using (CryptoStream stream = new CryptoStream(buffer, transform, CryptoStreamMode.Write))

            //{

            using (StreamWriter writer = new StreamWriter(buffer, Encoding.Unicode))

            {

                writer.Write(Value);

            }

​

            //}

            foreach (byte b in buffer.ToArray())

            {

                Console.Write(String.Format("{0:X2} ", b));

            }

​

            Console.WriteLine();

        }

    }

}