using System;
using System.Collections.Generic;
using System.IO;
using System.Security.Cryptography;
using System.Text;

namespace ReportTemplateTool.Helper
{
    public class DesHelper
    {
        public static string DesDecrypt(string data)
        {
            byte[] bytes = Encoding.ASCII.GetBytes("Lis2021W");
            byte[] bytes2 = Encoding.ASCII.GetBytes("xbd2021W");
            byte[] buffer;
            try
            {
                buffer = Convert.FromBase64String(data);
            }
            catch
            {
                return null;
            }

            DESCryptoServiceProvider dESCryptoServiceProvider = new DESCryptoServiceProvider();
            MemoryStream stream = new MemoryStream(buffer);
            CryptoStream stream2 = new CryptoStream(stream, ((SymmetricAlgorithm)(object)dESCryptoServiceProvider).CreateDecryptor(bytes, bytes2), CryptoStreamMode.Read);
            StreamReader streamReader = new StreamReader(stream2);
            return streamReader.ReadToEnd();
        }
    }
}