ASP.NET中密码保护，MD5和SHA1算法的使用

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" %>

<body>

<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。