Common/StrHelper.cs

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using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Configuration;
using System.Web;
using System.Drawing;
using System.Text.RegularExpressions;
using System.IO;
using System.Web.Security;
using System.Security.Cryptography;



namespace Common
{
    public abstract class StrHelper
    {
        #region 加密可逆算法
        const string KEY_64 = "tl(_%/*]";//注意了，是8个字符，64位
        const string IV_64 = "tl(_%/*]";
        ///// <summary>
        ///// 加密算法
        ///// </summary>
        public static string EncodePwd(string data)
        {
            byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
            byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

            DESCryptoServiceProvider cryptoProvider = new DESCryptoServiceProvider();
            int i = cryptoProvider.KeySize;
            MemoryStream ms = new MemoryStream();
            CryptoStream cst = new CryptoStream(ms, cryptoProvider.CreateEncryptor(byKey, byIV), CryptoStreamMode.Write);

            StreamWriter sw = new StreamWriter(cst);
            sw.Write(data);
            sw.Flush();
            cst.FlushFinalBlock();
            sw.Flush();
            return Convert.ToBase64String(ms.GetBuffer(), 0, (int)ms.Length);

        }
        ///// <summary>
        ///// 解密算法
        ///// </summary>
        public static string DecodePwd(string data)
        {
            byte[] byKey = System.Text.ASCIIEncoding.ASCII.GetBytes(KEY_64);
            byte[] byIV = System.Text.ASCIIEncoding.ASCII.GetBytes(IV_64);

            byte[] byEnc;
            try
            {
                byEnc = Convert.FromBase64String(data);
            }
            catch
            {
                return null;
            }