ASP.NET中密码保护，MD5和SHA1算法的使用

领测软件测试网 你的主页或者你管理的网站有各种密码需要保护，把密码直接放在数据库或者文件中存在不少安全隐患，所以密码加密后存储是最常见的做法。在ASP.NET中实现加密非常容易。.NET SDK中提供了CookieAuthentication类，其中的HashPasswordForStoringInConfigFile方法可直接使用MD5和SHA1算法。例子如下：
file: encrypting.aspx
<%@ Page language="c#" Codebehind="encrypting.cs" AutoEventWireup="false" Inherits="encrypting.encrypting" %>
<html><head>
    <meta name="GENERATOR" Content="Microsoft Visual Studio 7.0">
    <meta name="CODE_LANGUAGE" Content="C#"></head>
  <body>

    <form method="post" runat="server">
<p> </p>
<p>
<asp:TextBox id=TextBox1 runat="server"></asp:TextBox>
<asp:Button id=Button1 runat="server" Text="encrypting"></asp:Button></p>
<p>Encrypting Password(MD5):
<asp:Label id=MD5 runat="server"></asp:Label></p>
     </form>

  </body></html>

file:encrypting.cs

namespace encrypting
{
    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.Web.Security;
    /// <summary>
    ///    Summary description for encrypting.
    /// </summary>
    public class encrypting : System.Web.UI.Page
    {
  protected System.Web.UI.WebControls.Label MD5;
  protected System.Web.UI.WebControls.Button Button1;
  protected System.Web.UI.WebControls.TextBox TextBox1;

public encrypting()
{
     Page.Init += new System.EventHandler(Page_Init);
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                //
                // Evals true first time browser hits the page
                //
            }
        }
        protected void Page_Init(object sender, EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP+ Windows Form Designer.
            //
            InitializeComponent();
        }
        /// <summary>
        ///    Required method for Designer support - do not modify
        ///    the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
  {
   Button1.Click += new System.EventHandler (this.Button1_Click);
   this.Load += new System.EventHandler (this.Page_Load);
  }
  public void Button1_Click (object sender, System.EventArgs e)
  {
   MD5.Text = CookieAuthentication.HashPasswordForStoringInConfigFile(TextBox1.Text,"MD5");
   //SHA1 use CookieAuthentication.HashPasswordForStoringInConfigFile(TextBox1.Text,"SHA1");
  }
    }
}
注意：类CookieAuthentication的namespace是System.Web.Security。 

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