ASP.NET中密码保护，MD5和SHA1算法的使用教程

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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