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86 lines
2.7 KiB
PHP
86 lines
2.7 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 Think {
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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($key);
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$char = $str = '';
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for ($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, $i, 1)))%256);
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}
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return str_replace(array('+','/','='),array('-','_',''),base64_encode($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($key);
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$data = str_replace(array('-','_'),array('+','/'),$data);
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$mod4 = strlen($data) % 4;
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if ($mod4) {
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$data .= substr('====', $mod4);
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}
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$data = base64_decode($data);
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$x = 0;
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$len = strlen($data);
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$l = strlen($key);
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$char = $str = '';
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for ($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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} |