Common/CookiesHelper.cs

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

namespace BLL
{
  public  class CookiesHelper
    {
        static string _QueryStringKey = "e2345678";
        /// <summary>
        /// 加密算法
        /// </summary>
        public static string EncryptQueryString(string QueryString)
        {
            return Encrypt(QueryString, _QueryStringKey);
        }

        /// <summary>
        /// 解密算法
        /// </summary>
        public static string DecryptQueryString(string QueryString)
        {
            return Decrypt(QueryString, _QueryStringKey);
        }

        public static string Encrypt(string originalString, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            // 把字符串放到byte数组中
            byte[] inputByteArray = Encoding.Default.GetBytes(originalString);
            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey); //建立加密对象的密钥和偏移量
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);  //原文使用ASCIIEncoding.ASCII方法的
                                                          // GetBytes方法
            MemoryStream ms = new MemoryStream();         //使得输入密码必须输入英文文本
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            StringBuilder ret = new StringBuilder();
            foreach (byte b in ms.ToArray())
            {
                ret.AppendFormat("{0:X2}", b);
            }
            ret.ToString();
            return ret.ToString();
        }
        public static string Decrypt(string originalString, string sKey)
        {
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = new byte[originalString.Length / 2];
            for (int x = 0; x < originalString.Length / 2; x++)
            {
                int i = (Convert.ToInt32(originalString.Substring(x * 2, 2), 16));
                inputByteArray[x] = (byte)i;
            }
            //建立加密对象的密钥和偏移量，此值重要，不能修改
            des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
            des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);