using System;

using System.IO;

using System.Security.Cryptography;

using System.Text;

​

public class Program

{

    public static void Main()

    {

        var key = "BD42BEEA3F749557534480FEE899BFC247ECFBE6B22175D5E99A32772E21C721";

        var data = Convert.FromBase64String("aj8ww362WfgiBY+KMn9qBa6UB0IuP24UnAvKFKQ+wQZJXrZQedWqn2J+g3cB+Fqp1QZrDoPSuEa6ievKIr5/svvZDCjCAOUnAZxz9DSA7qUvQvbkspKXOIUjzxWKTlxdUAAAAA==");

        Console.Write(Encoding.Unicode.GetString(DecryptData(data, key)));

    }

        private static byte[] DecryptData(byte[] data, string key)

        {

            byte[] numArray;

            byte[] numArray1 = new byte[8];

            Array.Copy(data, (int)data.Length - 12, numArray1, 0, 8);

            int num = BitConverter.ToInt32(data, (int)data.Length - 4);

            byte[] numArray2 = new byte[num];

            using (MemoryStream memoryStream = new MemoryStream(data, 0, (int)data.Length - 12))

            {

                var provider = BuildProvider(key);

                using (CryptoStream cryptoStream = new CryptoStream(memoryStream, provider.CreateDecryptor(provider.Key, numArray1), CryptoStreamMode.Read))

                {

                    cryptoStream.Read(numArray2, 0, num);

                    numArray = numArray2;

                }

            }

            return numArray;

        }   

        public static TripleDESCryptoServiceProvider BuildProvider(string key)

        {

            TripleDESCryptoServiceProvider tripleDESCryptoServiceProvider = new TripleDESCryptoServiceProvider();

            int length = (int)tripleDESCryptoServiceProvider.Key.Length;

            string str = key;

            while (str.Length / 2 < length)

            {

                str = string.Concat(str, str);

            }

            tripleDESCryptoServiceProvider.Key = HexToBytes(str.Substring(0, length * 2));

            return tripleDESCryptoServiceProvider;

        }   

            public static byte[] HexToBytes(string hexString)

        {

            byte[] num = new byte[hexString.Length / 2];

            for (int i = 0; i < (int)num.Length; i++)

            {

                num[i] = Convert.ToByte(hexString.Substring(i * 2, 2), 16);

            }

            return num;

        }

​

}