一个可逆加密的例子

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一个可逆加密的例子

发布时间：2008年12月03日点击数：次孟宪会

下面的代码实现了一个可逆加密的方法。可以用于对Cookie，QueryString等加密处理。

前台EncryptString.aspx

<%@ Page language="c#" EnableViewState = "true" Codebehind="EncryptString.aspx.cs" AutoEventWireup="false" Inherits="eMeng.Exam.EncryptString" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title>一个可逆加密的例子</title>
<meta name="GENERATOR" content="Microsoft Visual Studio.NET 7.0">
<meta name="CODE_LANGUAGE" content="Visual Basic 7.0">
<meta name="vs_defaultClientScript" content="JavaScript">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<p align="center">一个可逆加密的例子
<asp:TextBox id="TextBox1" runat="server" Width="96%">http://dotnet.aspx.cc/</asp:TextBox>
<asp:RadioButtonList id="RadioButtonList1" runat="server" Font-Bold="True" RepeatDirection="Horizontal"
AutoPostBack="True"></asp:RadioButtonList>
<asp:TextBox id="TextBox2" runat="server" Width="96%"></asp:TextBox>
<asp:TextBox id="Textbox3" runat="server" Width="96%"></asp:TextBox>
</p>
</form>
</body>
</HTML>

后台EncryptString.aspx.cs

using System;

using System.Collections;

using System.ComponentModel;

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.IO;

using System.Text;

using System.Security.Cryptography;

namespace eMeng.Exam

{

/// <summary>
/// EncryptString 的摘要说明。

/// </summary>

public class EncryptString : System.Web.UI.Page

{

protected System.Web.UI.WebControls.TextBox TextBox1;

protected System.Web.UI.WebControls.RadioButtonList RadioButtonList1;

protected System.Web.UI.WebControls.TextBox TextBox2;

protected System.Web.UI.WebControls.TextBox Textbox3;

protected System.Web.UI.HtmlControls.HtmlForm Form1;

private void Page_Load(object sender, System.EventArgs e)

{

// 在此处放置用户代码以初始化页面

if(!this.IsPostBack)

{

ArrayList MyList = new ArrayList();

MyList.Add("加密");

MyList.Add("解密");

RadioButtonList1.DataSource = MyList;

RadioButtonList1.DataBind();

}

Web 窗体设计器生成的代码

private void RadioButtonList1_SelectedIndexChanged(object sender, System.EventArgs e)

{

if( RadioButtonList1.SelectedIndex == 0)

TextBox2.Text = EncryptText(TextBox1.Text);

else

Textbox3.Text = DecryptText(TextBox2.Text);

}

// 加密

public string EncryptText(String strText)

{

return Encrypt(strText, "&%#@?,:*");

}

//'解密

public String DecryptText(String strText)

{

return Decrypt(strText, "&%#@?,:*");

}

//'加密函数

private String Encrypt(String strText, String strEncrKey)

{

Byte[] byKey = {};

Byte[] IV = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};

try

{

byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

Byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

return Convert.ToBase64String(ms.ToArray());

}

catch(Exception ex)

{

return ex.Message;

}

//'解密函数

private String Decrypt(String strText, String sDecrKey)

{

Byte[] byKey = {};

Byte[] IV = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};

Byte[] inputByteArray = new byte[strText.Length];

try

{

byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));

DESCryptoServiceProvider des = new DESCryptoServiceProvider();

inputByteArray = Convert.FromBase64String(strText);

MemoryStream ms = new MemoryStream();

CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);

cs.Write(inputByteArray, 0, inputByteArray.Length);

cs.FlushFinalBlock();

System.Text.Encoding encoding = System.Text.Encoding.UTF8;

return encoding.GetString(ms.ToArray());

}

catch(Exception ex)

{

return ex.Message;

}

一个可逆加密的例子

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