using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

using System.Web;

​

​

​

public class Program

{

            public static string strKey = "11223344";//"12345678";

        public static string strIV = "HdsAdmin";//"Edward.K";

​

    public static void Main()

    {

        Console.WriteLine(Encrypt("KB30002012"));

        Console.WriteLine(Decrypt("itpXB9HkOmOEaCOV5XS4CA=="));

        //

    }

        /// <summary>

        /// 資料加密

        /// </summary>

        /// <param name="_strQ"></param>

        /// <returns></returns>

        public static string Encrypt(string _strQ)

        {

            if (String.IsNullOrEmpty(_strQ))

                return _strQ;

​

            byte[] buffer = Encoding.UTF8.GetBytes(_strQ);

            MemoryStream ms = new MemoryStream();

            DESCryptoServiceProvider tdes = new DESCryptoServiceProvider();

            CryptoStream encStream = new CryptoStream(ms, tdes.CreateEncryptor(Encoding.UTF8.GetBytes(strKey), Encoding.UTF8.GetBytes(strIV)), CryptoStreamMode.Write);

            encStream.Write(buffer, 0, buffer.Length);

            encStream.FlushFinalBlock();

            return Convert.ToBase64String(ms.ToArray()).Replace("+", "%");

        }

        /// <summary>

        /// 資料解密

        /// </summary>

        /// <param name="_strQ"></param>

        /// <returns></returns>

        public static string Decrypt(string _strQ)

        {

            try

            {

​

                _strQ = _strQ.Replace("%", "+");

                byte[] buffer = Convert.FromBase64String(_strQ);

                MemoryStream ms = new MemoryStream();

                DESCryptoServiceProvider tdes = new DESCryptoServiceProvider();

                CryptoStream encStream = new CryptoStream(ms, tdes.CreateDecryptor(Encoding.UTF8.GetBytes(strKey), Encoding.UTF8.GetBytes(strIV)), CryptoStreamMode.Write);

                encStream.Write(buffer, 0, buffer.Length);

                encStream.FlushFinalBlock();

                return Encoding.UTF8.GetString(ms.ToArray());

            }

            catch

            {

                return _strQ;

            }

        }

}

​

​

​