using System;

using System.Security.Cryptography;

using System.Text;

public class Program

{

    public static string smethod_4(string string_0, string string_1 = null)

        {

            RijndaelManaged rijndaelManaged = new RijndaelManaged();

            MD5CryptoServiceProvider mD5CryptoServiceProvider = new MD5CryptoServiceProvider();

            string result = null;

            try

            {

                byte[] array = new byte[32];

                byte[] bytes = Encoding.ASCII.GetBytes("0e139b9201cb4c319ca12e882de473e8");

                if (string_1 != null)

                {

                    bytes = Encoding.ASCII.GetBytes(string_1);

                }

                byte[] sourceArray = mD5CryptoServiceProvider.ComputeHash(bytes);

                Array.Copy(sourceArray, 0, array, 0, 16);

                Array.Copy(sourceArray, 0, array, 15, 16);

                rijndaelManaged.Key = array;

                rijndaelManaged.Mode = CipherMode.ECB;

                ICryptoTransform cryptoTransform = rijndaelManaged.CreateDecryptor();

                byte[] array2 = Convert.FromBase64String(string_0);

                result = Encoding.ASCII.GetString(cryptoTransform.TransformFinalBlock(array2, 0, array2.Length));

            }

            catch (Exception expr_97)

            {

                Console.WriteLine(expr_97.ToString());

            }

            return result;

        }

    public static void Main()

    {

        String[] strings = {

            "sc5TFmVh7TetHprP8s4QYd8EWXfSJiW6u4kgEw7stA8=",

            "fRTEmhKk6wdOBfy5LHhA5Q==",

            "knPWD68TPXTS+ItJdc0YvQ=="

        };

        foreach(String str in strings){

            Console.WriteLine(smethod_4(str, null));

        }

    }

}