js加密，解密

来源：互联网发布：湖北快三数据编辑：程序博客网时间：2024/04/30 20:58

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Login.aspx.cs" Inherits="BaiYu.WebUI.Login" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
<title>检察机关案件质量督查平台</title>
<script type="text/javascript">
if (window != window.top) {
window.open(window.location.href, "_top");
}
</script>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">

</style>
<script type="text/javascript">
/***************加密，解密方法*****************/
//加密
function Encrypt(str, pwd) {
if (str == "") return "";
str = escape(str);
if (!pwd || pwd == "") { var pwd = "123456"; }
pwd = escape(pwd);
if (pwd == null || pwd.length <= 0) {
alert("Please enter a password with which to encrypt the message.");
return null;
}
var prand = "";
for (var I = 0; I < pwd.length; I++) {
prand += pwd.charCodeAt(I).toString();
}
var sPos = Math.floor(prand.length / 5);
var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos * 2) + prand.charAt(sPos * 3) + prand.charAt(sPos * 4) + prand.charAt(sPos * 5));
var incr = Math.ceil(pwd.length / 2);
var modu = Math.pow(2, 31) - 1;
if (mult < 2) {
alert("Algorithm cannot find a suitable hash. Please choose a different password. /nPossible considerations are to choose a more complex or longer password.");

return null;
}
var salt = Math.round(Math.random() * 1000000000) % 100000000;
prand += salt;
while (prand.length > 10) {
prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
}
prand = (mult * prand + incr) % modu;
var enc_chr = "";
var enc_str = "";
for (var I = 0; I < str.length; I++) {
enc_chr = parseInt(str.charCodeAt(I) ^ Math.floor((prand / modu) * 255));
if (enc_chr < 16) {
enc_str += "0" + enc_chr.toString(16);
} else
enc_str += enc_chr.toString(16);
prand = (mult * prand + incr) % modu;
}
salt = salt.toString(16);
while (salt.length < 8) salt = "0" + salt;
enc_str += salt;
return enc_str;
}

//解密
function Decrypt(str, pwd) {
if (str == "") return "";
if (!pwd || pwd == "") { var pwd = "123456"; }
pwd = escape(pwd);
if (str == null || str.length < 8) {
//alert("A salt value could not be extracted from the encrypted message because it's length is too short. The message cannot be decrypted.");
return "";
}
if (pwd == null || pwd.length <= 0) {
alert("Please enter a password with which to decrypt the message.");
return;
}
var prand = "";
for (var I = 0; I < pwd.length; I++) {
prand += pwd.charCodeAt(I).toString();
}
var sPos = Math.floor(prand.length / 5);
var mult = parseInt(prand.charAt(sPos) + prand.charAt(sPos * 2) + prand.charAt(sPos * 3) + prand.charAt(sPos * 4) + prand.charAt(sPos * 5));
var incr = Math.round(pwd.length / 2);
var modu = Math.pow(2, 31) - 1;
var salt = parseInt(str.substring(str.length - 8, str.length), 16);
str = str.substring(0, str.length - 8);
prand += salt;
while (prand.length > 10) {
prand = (parseInt(prand.substring(0, 10)) + parseInt(prand.substring(10, prand.length))).toString();
}
prand = (mult * prand + incr) % modu;
var enc_chr = "";
var enc_str = "";
for (var I = 0; I < str.length; I += 2) {
enc_chr = parseInt(parseInt(str.substring(I, I + 2), 16) ^ Math.floor((prand / modu) * 255));
enc_str += String.fromCharCode(enc_chr);
prand = (mult * prand + incr) % modu;
}
return unescape(enc_str);
}

// End -->

window.onload = function () {
document.getElementById("BrowserWidth").value = window.screen.width;
document.getElementById("BrowserHeight").value = window.screen.height;
var UserName = document.getElementById("Username").vlaue;
document.getElementById('Username').focus();

if (isPostBack == "False") {
//取最后一个cookie赋值密码、用户框
GetLastUser();
}
}

//获取最后一个用户cookie（包括用户名和密码）
function GetLastUser() {
var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67"; //GUID标识符
var usr = GetCookie(id);
if (usr != null) {
document.getElementById('Username').value = usr;
document.getElementById('Password').focus();
} else {
document.getElementById('Username').value = "";
}
GetPwdAndChk();
}
//加密字符串
var mima = "123456";
//加密后的字符串
var DePass = "";
//输入的真实密码
var TruePass = "";
//点击登录时触发客户端事件
function SetPwdAndChk() {
//取用户名
var usr = document.getElementById('Username').value;
//将最后一个用户信息写入到Cookie
SetLastUser(usr);
//如果记住密码选项被选中
if (document.getElementById('chkRememberPwd').checked == true) {
//取密码值
var pwd = document.getElementById('Password').value;
TruePass = pwd;
pwd = Encrypt(mima, pwd);
DePass = pwd;
var expdate = new Date();
expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000));
//将用户名和密码写入到Cookie
SetCookie(usr, pwd, expdate);
} else {
//如果没有选中记住密码,则立即过期
ResetCookie();
}
}
//设置最后一个用户cookie
function SetLastUser(usr) {
var id = "49BAC005-7D5B-4231-8CEA-16939BEACD67";
var expdate = new Date();
//当前时间加上两周的时间
expdate.setTime(expdate.getTime() + 14 * (24 * 60 * 60 * 1000));
SetCookie(id, usr, expdate);
}
//用户名失去焦点时调用该方法
function GetPwdAndChk() {
var usr = document.getElementById('Username').value;
//var pwd = GetCookie(usr);
var pwd = Decrypt(GetCookie(usr), TruePass);
//alert(TruePass);
if (pwd != null) {
document.getElementById('chkRememberPwd').checked = true;
document.getElementById('Password').value = pwd;
} else {
document.getElementById('chkRememberPwd').checked = false;
document.getElementById('Password').value = "";
}
}
//取Cookie的值
function GetCookie(name) {
var arg = name + "=";
var alen = arg.length;
var clen = document.cookie.length;
var i = 0;
while (i < clen) {
var j = i + alen;
//alert(j);
if (document.cookie.substring(i, j) == arg) return getCookieVal(j);
i = document.cookie.indexOf(" ", i) + 1;
if (i == 0) break;
}
return null;
}
var isPostBack = "<%= IsPostBack %>";
function getCookieVal(offset) {
var endstr = document.cookie.indexOf(";", offset);
if (endstr == -1) endstr = document.cookie.length;
return unescape(document.cookie.substring(offset, endstr));
}
//写入到Cookie
function SetCookie(name, value, expires) {
var argv = SetCookie.arguments;
//本例中length = 3
var argc = SetCookie.arguments.length;
var expires = (argc > 2) ? argv[2] : null;
var path = (argc > 3) ? argv[3] : null;
var domain = (argc > 4) ? argv[4] : null;
var secure = (argc > 5) ? argv[5] : false;
document.cookie = name + "=" + escape(value) + ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + ((path == null) ? "" : ("; path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) + ((secure == true) ? "; secure" : "");
}
//重置cookie
function ResetCookie() {
var usr = document.getElementById('Username').value;
var expdate = new Date();
SetCookie(usr, null, expdate);
}
</script>
</head>
<body scroll="no">
<form action="?action=login&<%=url %>" method="post" id="formLogin">
<table class="warper">
<tr>
<td valign="top">
<table width="1003" border="0" cellspacing="0" cellpadding="0">
<tr>
<td width="425" height="315">
 
</td>
<td width="221">
 
</td>
<td width="357">
 
</td>
</tr>
<tr>
<td height="181">
 
</td>
<td valign="top">
<form id="form1" name="form1" method="post" action="">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
<label>
<input class="login_input" id="Username" name="Username" type="text" maxlength="10" onblur="GetPwdAndChk()"
value="" />
</label>
</td>
</tr>
<tr>
<td height="5">
</td>
</tr>
<tr>
<td>
<label>
<input class="login_input" id="Password" name="Password" type="password" runat="server" />
</label>
</td>
</tr>
<tr>
<td align="right" class="inpass">
<label>
<input name="chkRememberPwd" id="chkRememberPwd" type="checkbox" checked="checked" runat="server" />
记住密码
</label>
</td>
</tr>
<tr>
<td height="5">
</td>
</tr>
<tr>
<td align="right">
<label>
<input type="submit" name="Submit" value="" class="in_bnt" onclick="SetPwdAndChk()" />
</label>
<input type="hidden" name="BrowserWidth" id="BrowserWidth" runat="server" />
<input type="hidden" name="BrowserHeight" id="BrowserHeight" runat="server" />
</td>
</tr>
</table>
</form>
</td>
<td>
 
</td>
</tr>
<tr>
<td>
 
</td>
<td>
 
</td>
<td>
 
</td>
</tr>
</table>
</td>
</tr>
</table>
</form>
</body>
</html>