php加密類

這篇文章的主要內容是介紹了關於php加密類 ，有著一定的參考價值，現在分享給大家，有需要的朋友可以參考一下

<?phpnamespace app\index\controller;class Crypt{    private $key = "";      public function __construct($key = null)        {            if (!is_null($key)) {                        $this->key = $key;                                }         }         //加密函數         public function passport_encrypt($txt)     {             srand((double)microtime() * 1000000);                     $encrypt_key = md5(rand(0, 32000));                     $ctr = 0;                     $tmp = '';                     for ($i = 0; $i < strlen($txt); $i++) {                         $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;                                     $tmp .= $encrypt_key[$ctr] . ($txt[$i] ^ $encrypt_key[$ctr++]);                                 }                                 return urlencode(base64_encode($this->passport_key($tmp, $this->key)));            }            //解密函數            public function passport_decrypt($txt)            {                $txt = $this->passport_key(base64_decode(urldecode($txt)), $this->key);                $tmp = '';                for ($i = 0; $i < strlen($txt); $i++) {                    $md5 = $txt[$i];                                $tmp .= $txt[++$i] ^ $md5;                            }                            return $tmp;           }           private function passport_key($txt, $encrypt_key)           {               $encrypt_key = md5($encrypt_key);               $ctr = 0;               $tmp = '';               for ($i = 0; $i < strlen($txt); $i++) {                   $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;                               $tmp .= $txt[$i] ^ $encrypt_key[$ctr++];                           }                           return $tmp;                       }           }