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83 lines
2.3 KiB
PHP
83 lines
2.3 KiB
PHP
<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: liu21st <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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namespace Think\Crypt\Driver;
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/**
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* Crypt 加密实现类
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* @category ORG
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* @package ORG
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* @subpackage Crypt
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* @author liu21st <liu21st@gmail.com>
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*/
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class Crypt {
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/**
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* 加密字符串
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* @param string $str 字符串
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* @param string $key 加密key
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* @param integer $expire 有效期（秒）
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* @return string
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*/
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public static function encrypt($str,$key,$expire=0){
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$expire = sprintf('%010d', $expire ? $expire + time():0);
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$r = md5($key);
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$c = 0;
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$v = "";
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$str = $expire.$str;
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$len = strlen($str);
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$l = strlen($r);
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for ($i=0;$i<$len;$i++){
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if ($c== $l) $c=0;
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$v .= substr($r,$c,1) .
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(substr($str,$i,1) ^ substr($r,$c,1));
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$c++;
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}
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return self::ed($v,$key);
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}
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/**
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* 解密字符串
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* @param string $str 字符串
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* @param string $key 加密key
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* @return string
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*/
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public static function decrypt($str,$key) {
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$str = self::ed($str,$key);
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$v = "";
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$len = strlen($str);
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for ($i=0;$i<$len;$i++){
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$md5 = substr($str,$i,1);
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$i++;
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$v .= (substr($str,$i,1) ^ $md5);
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}
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$data = $v;
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$expire = substr($data,0,10);
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if($expire > 0 && $expire < time()) {
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return '';
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}
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$data = substr($data,10);
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return $data;
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}
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static private function ed($str,$key) {
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$r = md5($key);
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$c = 0;
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$v = '';
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$len = strlen($str);
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$l = strlen($r);
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for ($i=0;$i<$len;$i++) {
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if ($c==$l) $c=0;
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$v .= substr($str,$i,1) ^ substr($r,$c,1);
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$c++;
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}
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return $v;
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}
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} |