/Framework/System/Crypt/Driver/Crypt.class.php
PHP | 96 lines | 57 code | 4 blank | 35 comment | 9 complexity | 16c3c6a7b8cfea2a8879b04823a1bf21 MD5 | raw file
- <?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
- *
- * @static
- * @access public
- * @param string $str 字符串
- * @param string $key 加密key
- * @param integer $expire 有效期(秒)
- * @return string 加密后的密文
- */
- public static function encrypt($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
- *
- * @static
- * @access public
- * @param string $str 字符串
- * @param string $key 加密key
- * @return string 解密后的明文
- */
- public static function decrypt($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;
- }
- }