88 lines
1.9 KiB
PHP
88 lines
1.9 KiB
PHP
<?php namespace App\Utils;
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class Encrypt
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{
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/*
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核心，加密解密用的key，加密和解密时的key必须相同
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如果通过其他方法使key为动态可提高破解复杂度
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*/
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static private $key = null;
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static private $keyLen = 0;
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/*
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亦或次数，亦或由于是位运算，故速度非常快，且不会增加数据长度
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增加此数值以提高复杂度，但同时需要更多的性能开销
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*/
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static private $xorCount = 2;
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static private $errno = 0;
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static private $errmsg = '';
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/* 加密 */
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static public function encrypt($content)
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{
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$content = (string)$content;
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self::$key = env('UU_KEY', 'V2V0Q9xcS7Uebem6s48d8fN4Afj331pbz2Y9J695q8h3k2k4bfk1n08cu8Sb44W5');
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self::$keyLen = strlen(self::$key);
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if(self::iscrypted($content))
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return $content;
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$pcontent = rawurlencode(base64_encode( self::loopXor($content)));
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if($pcontent)
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$pcontent = '^+'.$pcontent;
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return $pcontent;
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}
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/* 是否加密
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* return:
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*/
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static public function iscrypted($content)
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{
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if(substr($content, 0, 2) === '^+' && strlen($content)>2){
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return true;
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}
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return false;
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}
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/* 解密
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* return:
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*/
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static public function decrypt($content)
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{
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self::$key = env('UU_KEY', 'V2V0Q9xcS7Uebem6s48d8fN4Afj331pbz2Y9J695q8h3k2k4bfk1n08cu8Sb44W5');
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self::$keyLen = strlen(self::$key);
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if(substr($content, 0, 2) === '^+'){
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$content = substr($content, 2);
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}else{
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return $content;
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}
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return htmlspecialchars(self::loopXor( base64_decode( rawurldecode($content) ) ));
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}
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static public function checkStatus()
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{
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$return = array('errno'=>self::$errno, 'errmsg'=>self::$errmsg);
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if(self::$errno){
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self::$errno = 0;
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self::$errmsg = '';
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}
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return $return;
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}
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static private function loopXor($data)
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{
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$len = strlen($data);
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$xc = self::$xorCount;
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do{
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for( $i=0; $i<$len; $i++ ){
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$data[$i] = $data[$i]^self::$key[$i%self::$keyLen];
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}
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}
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while($xc--);
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return $data;
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}
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}
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?>
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