HyperLesson/Student/Password-S.aspx.cs

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using BLL;
using Model;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace HyperLesson
{
    public partial class Password_S : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        //MD5加密
        // 32 位
        public static String Encrypt(String s)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] bytes = System.Text.Encoding.UTF8.GetBytes(s);
            bytes = md5.ComputeHash(bytes);
            md5.Clear();
            string ret = "";
            for (int i = 0; i < bytes.Length; i++)
            {
                ret += Convert.ToString(bytes[i], 16).PadLeft(2, '0');
            }
            return ret.PadLeft(32, '0');
        }
        // 16 位
        public static string Encrypt16(string ConvertString)
        {
            MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider();
            string t2 = BitConverter.ToString(md5.ComputeHash(UTF8Encoding.Default.GetBytes(ConvertString)), 4, 8);
            t2 = t2.Replace("-", "");
            return t2;
        }

        student user = new student();
        protected void Button1_Click(object sender, EventArgs e)
        {
            user.StudentNum = (Session["userinfo"] as student).StudentNum;
            user.userPwd = Encrypt(this.newpwd.Text);
            if (Page.IsPostBack)
            {
                if (oldpwd.Text.Length < 6 || oldpwd.Text.Length > 16)
                {
                    Response.Write("<script>alert('违法操作！!')</script>");
                    return;
                }
                if ((Session["userinfo"] as student).userPwd != Encrypt(this.oldpwd.Text))
                {
                    Response.Write("<script>alert('旧密码错误！')</script>");
                    return;
                };