安全--解密

using  System;
using  System.Collections;
using  System.ComponentModel;
using  System.Data;
using  System.Drawing;
using  System.Web;
using  System.Web.SessionState;
using  System.Web.UI;
using  System.Web.UI.WebControls;
using  System.Web.UI.HtmlControls;
using  System.Data.SqlClient;
using  System.Web.Security;
using  System.Security.Cryptography;
using  System.Text;
using  System.IO;
namespace  CommandExample
{
    /**//// <summary>
    /// login 的摘要说明。
    /// </summary>
    public class Login01 : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.Label Label1;
        protected System.Web.UI.WebControls.TextBox tbName;
        protected System.Web.UI.WebControls.TextBox tbPass;
        protected System.Web.UI.WebControls.Button btnLoginBetter;
        protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator1;
        protected System.Web.UI.WebControls.RequiredFieldValidator RequiredFieldValidator2;
        protected System.Web.UI.WebControls.CheckBox PersistCookie;
        protected System.Web.UI.WebControls.Label Label2;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            // 在此处放置用户代码以初始化页面
        }

        Web Form Designer generated code#region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        /// 设计器支持所需的方法 - 不要使用代码编辑器修改
        /// 此方法的内容。
        /// </summary>
        private void InitializeComponent()
        {    
            this.btnLoginBetter.Click += new System.EventHandler(this.btnLoginBetter_Click);
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        private void btnLoginBetter_Click(object sender, System.EventArgs e)
        {
            bool bExist = AuthenticateUser(tbName.Text,tbPass.Text);
            if(bExist)
            {
                //1) //创建一个验证票据//相当于产生一个COOKIE
                FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(1, tbName.Text,DateTime.Now,
                    DateTime.Now.AddMinutes(30),PersistCookie.Checked,"User");
                
                //2) //并且加密票据
                string cookieStr =  FormsAuthentication.Encrypt(ticket);
                //3) 创建cookie//并且是以当前forms name=".MYWEB"命名,你可以自定义名称
                HttpCookie cookie =new HttpCookie(FormsAuthentication.FormsCookieName,cookieStr);//FormsAuthentication.FormsCookieName
                
                if(PersistCookie.Checked) //如果用户选择了保存密码
                    cookie.Expires=ticket.Expiration;//设置cookie有效期为票据有效期
                //cookie存放路径
                cookie.Path = FormsAuthentication.FormsCookiePath;
                //将cookie写入到系统中cookie文件中
                Response.Cookies.Add(cookie);
                // 4) do a redirect
                string strRedirect;
                strRedirect=Request["ReturnUrl"].ToString();
                
                if(strRedirect==null)
                    strRedirect="default.aspx";
                Response.Redirect(strRedirect,true);
            }
            else
                Response.Write("<script language='javascript'>alert('用户名称或密码错误!')</script>");
            
        }
        private bool ArraysEqual(byte[] array1,byte[] array2)
        {
            bool bResult = true;
            if(array1==null)
                throw new ArgumentNullException("array1");
            if(array2==null)
                throw new ArgumentNullException("array2");
            if(array1.Length == array2.Length)
            {
                for(int i=0;i<array1.Length;i++)
                {
                    if(array1[i]!=array2[i])
                    {
                        bResult = false;
                        break;
                    }
                }
            }

            return bResult;
        }
        private bool AuthenticateUser(string strUserName, string strUserPass)
        {
            SqlConnection con = new SqlConnection();
            con.ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["DSN"];
            con.Open();
        
            string strSql = "sp_getuserdetails";
            SqlCommand com = new SqlCommand(strSql,con);
            com.CommandType = CommandType.StoredProcedure;
            SqlParameter sqlpUser = new SqlParameter("@acctname",SqlDbType.NVarChar,64);
            sqlpUser.Value = tbName.Text;
            SqlParameter sqlpPasshash = new SqlParameter("@passhash",SqlDbType.NVarChar,50);
            sqlpPasshash.Direction = ParameterDirection.Output;
            SqlParameter sqlpPasssalt = new SqlParameter("@passsalt",SqlDbType.NVarChar,50);
            sqlpPasssalt.Direction = ParameterDirection.Output;
            com.Parameters.Add(sqlpUser);
            com.Parameters.Add(sqlpPasssalt);
            com.Parameters.Add(sqlpPasshash);
            com.ExecuteNonQuery();

            string hash = com.Parameters["@passhash"].Value.ToString();
            string salt = com.Parameters["@passsalt"].Value.ToString();

            bool bExist = false;
            if(hash==null||salt==null)
                bExist = false;
            else
            {
                byte[] saltBits = Convert.FromBase64String(salt);
                byte[] hashBits = Convert.FromBase64String(hash);
                byte[] passBits = Encoding.Unicode.GetBytes(strUserPass);
                
                HashAlgorithm hashAlg = SHA1.Create();
                CryptoStream cs = new CryptoStream(Stream.Null,hashAlg,CryptoStreamMode.Write);
                cs.Write(passBits,0,passBits.Length);
                cs.Write(saltBits,0,saltBits.Length);
                cs.FlushFinalBlock();
                cs.Close();

                byte[] digest = hashAlg.Hash;
                if (ArraysEqual(digest,hashBits))
                    bExist = true;
                else
                    bExist = false;
            }
            con.Close();
            return bExist;
        }

    }
}

上面代码中使用了一个存储过程 sp_getuserdetails,这个存储过程的代码如下

CREATE   PROCEDURE  sp_getuserdetails
@acctname   varchar ( 64 ),
@passhash   varchar ( 50 ) out,
@passsalt   varchar ( 50 ) out
  AS
select   @passhash = passwordHash, @passsalt = passwordSalt  from  formsUserInfo  where  userName = @acctname
GO