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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id: Crypt.class.php 2504 2011-12-28 07:35:29Z liu21st $
/**
+------------------------------------------------------------------------------
* Crypt 加密实现类
+------------------------------------------------------------------------------
* @category ORG
* @package ORG
* @subpackage Crypt
* @author liu21st <liu21st@gmail.com>
* @version $Id: Crypt.class.php 2504 2011-12-28 07:35:29Z liu21st $
+------------------------------------------------------------------------------
*/
class Crypt {
/**
+----------------------------------------------------------
* 加密字符串
+----------------------------------------------------------
* @access static
+----------------------------------------------------------
* @param string $str 字符串
* @param string $key 加密key
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
function encrypt($str,$key,$toBase64=false){
$r = md5($key);
$c=0;
$v = "";
$len = strlen($str);
$l = strlen($r);
for ($i=0;$i<$len;$i++){
if ($c== $l) $c=0;
$v.= substr($r,$c,1) .
(substr($str,$i,1) ^ substr($r,$c,1));
$c++;
}
if($toBase64) {
return base64_encode(self::ed($v,$key));
}else {
return self::ed($v,$key);
}
}
/**
+----------------------------------------------------------
* 解密字符串
+----------------------------------------------------------
* @access static
+----------------------------------------------------------
* @param string $str 字符串
* @param string $key 加密key
+----------------------------------------------------------
* @return string
+----------------------------------------------------------
* @throws ThinkExecption
+----------------------------------------------------------
*/
function decrypt($str,$key,$toBase64=false) {
if($toBase64) {
$str = self::ed(base64_decode($str),$key);
}else {
$str = self::ed($str,$key);
}
$v = "";
$len = strlen($str);
for ($i=0;$i<$len;$i++){
$md5 = substr($str,$i,1);
$i++;
$v.= (substr($str,$i,1) ^ $md5);
}
return $v;
}
function ed($str,$key) {
$r = md5($key);
$c=0;
$v = "";
$len = strlen($str);
$l = strlen($r);
for ($i=0;$i<$len;$i++) {
if ($c==$l) $c=0;
$v.= substr($str,$i,1) ^ substr($r,$c,1);
$c++;
}
return $v;
}
}
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