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74 lines
2.3 KiB
PHP
74 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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* Base64 加密实现类
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*/
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class Base64 {
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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 $expire 有效期（秒）
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* @return string
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*/
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public static function encrypt($data,$key,$expire=0) {
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$expire = sprintf('%010d', $expire ? $expire + time():0);
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$key = md5($key);
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$data = base64_encode($expire.$data);
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$x=0;
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$len = strlen($data);
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$l = strlen($key);
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for ($i=0;$i< $len;$i++) {
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if ($x== $l) $x=0;
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$char .=substr($key,$x,1);
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$x++;
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}
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for ($i=0;$i< $len;$i++) {
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$str .=chr(ord(substr($data,$i,1))+(ord(substr($char,$i,1)))%256);
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}
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return $str;
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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 $key 加密key
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* @return string
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*/
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public static function decrypt($data,$key) {
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$key = md5($key);
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$x=0;
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$len = strlen($data);
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$l = strlen($key);
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for ($i=0;$i< $len;$i++) {
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if ($x== $l) $x=0;
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$char .=substr($key,$x,1);
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$x++;
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}
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for ($i=0;$i< $len;$i++) {
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if (ord(substr($data,$i,1))<ord(substr($char,$i,1))) {
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$str .=chr((ord(substr($data,$i,1))+256)-ord(substr($char,$i,1)));
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}else{
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$str .=chr(ord(substr($data,$i,1))-ord(substr($char,$i,1)));
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}
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}
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$data = base64_decode($str);
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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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} |