一个可逆加密的例子

2024-07-21 02:30:02

字体：大中小

来源：转载

供稿：网友

    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。

  查看例子

  vb.net代码

  <%@ page language="vb" autoeventwireup="false" codebehind="encstring.<a href="http://dev.21tx.com/web/asp/" target="_blank">asp</a>x.vb"
   inherits="aspx<a href="http://dev.21tx.com/web/" target="_blank">web</a>.encstring" %>
  <!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="<a href="http://dev.21tx.com/web/javascript/" target="_blank">javascript</a>">
   <meta name="vs_targetschema" content="http://schemas.microsoft.com/intellisense/ie5">
   </head>
   <body ms_positioning="gridlayout">
   <asp:label id="label1" runat="server"></asp:label>
   <p align="center">
   <form id="form1" method="post" runat="server">
   <font face="宋体">
   <asp:textbox id="textbox1" runat="server" width="96%"></asp:textbox>
   <asp:radiobuttonlist id="radiobuttonlist1" runat="server" font-bold="true"
   repeatdirection="horizontal" autopostback="true" onselectedindexchanged="showres">
   </asp:radiobuttonlist>
   <asp:textbox id="textbox2" runat="server" width="96%"></asp:textbox>
   </font>
   </form>
   </p>
   </body>
  </html>

  后端代码encstring.aspx.vb：
  imports system
  imports system.io
  imports system.xml
  imports system.text
  imports system.security.cryptography
  public class encstring
   inherits system.web.ui.page
   protected withevents textbox1 as system.web.ui.webcontrols.textbox
   protected withevents textbox2 as system.web.ui.webcontrols.textbox
   protected withevents form1 as system.web.ui.htmlcontrols.htmlform
   protected withevents label1 as system.web.ui.webcontrols.label
   protected withevents radiobuttonlist1 as system.web.ui.webcontrols.radiobuttonlist

  #region " web form designer generated code "

   'this call is required by the web form designer.
   <system.diagnostics.debuggerstepthrough()> private sub initializecomponent()

   end sub

   private sub page_init(byval sender as system.object, byval e as system.eventargs) handles

  mybase.init
   'codegen: this method call is required by the web form designer
   'do not modify it using the code editor.
   initializecomponent()
   end sub

  #end region

   private sub page_load(byval sender as system.object, byval e as system.eventargs) handles

  mybase.load
   'put user code to initialize the page here
   label1.text = "<h3 align='center'>一个可逆加密的例子</h3>"
   if not ispostback then
   dim mylist as new arraylist()
   mylist.add("加密")
   mylist.add("解密")
   radiobuttonlist1.datasource = mylist
   radiobuttonlist1.databind()
   end if
   end sub

   ' 加密
   public shared function encrypttext(byval strtext as string) as string
   return encrypt(strtext, "&%#@?,:*")
   end function

   '解密
   public shared function decrypttext(byval strtext as string) as string
   return decrypt(strtext, "&%#@?,:*")
   end function

   '加密函数
   private shared function encrypt(byval strtext as string, byval strencrkey as string) as string
   dim bykey() as byte = {}
   dim iv() as byte = {&h12, &h34, &h56, &h78, &h90, &hab, &hcd, &hef}
   try
   bykey = system.text.encoding.utf8.getbytes(left(strencrkey, 8))
   dim des as new descryptoserviceprovider()
   dim inputbytearray() as byte = encoding.utf8.getbytes(strtext)
   dim ms as new memorystream()
   dim cs as new cryptostream(ms, des.createencryptor(bykey, iv), cryptostreammode.write)
   cs.write(inputbytearray, 0, inputbytearray.length)
   cs.flushfinalblock()
   return convert.tobase64string(ms.toarray())
   catch ex as exception
   return ex.message
   end try
   end function

   '解密函数
   private shared function decrypt(byval strtext as string, byval sdecrkey as string) as string
   dim bykey() as byte = {}
   dim iv() as byte = {&h12, &h34, &h56, &h78, &h90, &hab, &hcd, &hef}
   dim inputbytearray(strtext.length) as byte
   try
   bykey = system.text.encoding.utf8.getbytes(left(sdecrkey, 8))
   dim des as new descryptoserviceprovider()
   inputbytearray = convert.frombase64string(strtext)
   dim ms as new memorystream()
   dim cs as new cryptostream(ms, des.createdecryptor(bykey, iv), cryptostreammode.write)
   cs.write(inputbytearray, 0, inputbytearray.length)
   cs.flushfinalblock()
   dim encoding as system.text.encoding = system.text.encoding.utf8
   return encoding.getstring(ms.toarray())
   catch ex as exception
   return ex.message
   end try
   end function

   public sub showres(byval sender as object, byval e as system.eventargs)_
   handles radiobuttonlist1.selectedindexchanged
   if radiobuttonlist1.selectedindex = 0 then
   textbox2.text = encrypttext(textbox1.text)
   else
   textbox2.text = decrypttext(textbox1.text)
   end if
   end sub
  end class

   c#代码

  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>

  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();
  }
  }

  #region web 窗体设计器生成的代码
  override protected void oninit(eventargs e)
  {
  //
  // codegen: 该调用是 asp.net web 窗体设计器所必需的。
  //
  initializecomponent();
  base.oninit(e);
  }
  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void initializecomponent()
  {
  this.radiobuttonlist1.selectedindexchanged += new system.eventhandler(this.radiobuttonlist1_selectedindexchanged);
  this.load += new system.eventhandler(this.page_load);

  }
  #endregion

  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;
  }
  }
  }
  }