Crypt.class.php
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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>
// +----------------------------------------------------------------------
namespace Think\Crypt\Driver;
/**
* Crypt 加密实现类
*
* @category ORG
* @package ORG
* @subpackage Crypt
* @author liu21st <liu21st@gmail.com>
*/
class Crypt
{
/**
* 加密字符串
*
* @param string $str
* 字符串
* @param string $key
* 加密key
* @param integer $expire
* 有效期（秒）
* @return string
*/
public static function encrypt($str, $key, $expire = 0)
{
$expire = sprintf('%010d', $expire ? $expire + time() : 0);
$r = md5($key);
$c = 0;
$v = "";
$str = $expire . $str;
$len = strlen($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));
$c ++;
}
return self::ed($v, $key);
}
/**
* 解密字符串
*
* @param string $str
* 字符串
* @param string $key
* 加密key
* @return string
*/
public static function decrypt($str, $key)
{
$str = self::ed($str, $key);
$v = "";
$len = strlen($str);
for ($i = 0; $i < $len; $i ++) {
$md5 = substr($str, $i, 1);
$i ++;
$v .= (substr($str, $i, 1) ^ $md5);
}
$data = $v;
$expire = substr($data, 0, 10);
if ($expire > 0 && $expire < time()) {
return '';
}
$data = substr($data, 10);
return $data;
}
function ed($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;
}
}