Common/encrypt.cs

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using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Text;
using System.Security.Cryptography;
using System.IO;
/// <summary>
/// 密码加密
/// </summary>
public class encrypt
{
	public encrypt()
	{
		//
		// TODO: 在此处添加构造函数逻辑
		//
	}
    const string KEY_64 = "VavicApp";//注意了，是8个字符，64位

    const string IV_64 = "VavicApp";

  

    /// <summary>
    /// 可逆加密
    /// </summary>
    /// <param name="data"></param>
    /// <returns></returns>
    public static string Encode(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>
    ///可逆解密 
    /// </summary>
    /// <param name="data"></param>
    /// <returns></returns>
    public static String Decode(string data)
    {