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<?php
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// +----------------------------------------------------------------------
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// | OneThink [ WE CAN DO IT JUST THINK IT ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2013 http://www.onethink.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Author: 麦当苗儿 <zuojiazi@vip.qq.com> <http://www.zjzit.cn>
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// +----------------------------------------------------------------------
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/**
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* 系统非常规MD5加密方法
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* @param string $str 要加密的字符串
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* @return string
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*/
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function think_ucenter_md5($str, $key = 'ThinkUCenter'){
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return '' === $str ? '' : md5(sha1($str) . $key);
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}
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/**
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* 系统加密方法
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* @param string $data 要加密的字符串
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* @param string $key 加密密钥
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* @param int $expire 过期时间 (单位:秒)
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* @return string
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*/
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function think_ucenter_encrypt($data, $key, $expire = 0) {
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$key = md5($key);
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$data = base64_encode($data);
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$x = 0;
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$len = strlen($data);
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$l = strlen($key);
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$char = '';
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for ($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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$str = sprintf('%010d', $expire ? $expire + time() : 0);
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for ($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('=', '', base64_encode($str));
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}
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/**
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* 系统解密方法
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* @param string $data 要解密的字符串 （必须是think_encrypt方法加密的字符串）
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* @param string $key 加密密钥
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* @return string
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*/
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function think_ucenter_decrypt($data, $key){
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$key = md5($key);
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$x = 0;
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$data = base64_decode($data);
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$expire = substr($data, 0, 10);
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$data = substr($data, 10);
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if($expire > 0 && $expire < time()) {
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return '';
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}
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$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, $i, 1)));
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}
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}
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return base64_decode($str);
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}
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