ASP.NET中使用MD5和SHA1算法加密

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