php 3des 加密类

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下面是一个我经常用到的3des加密类：
class STD3Des {     private $key = "";     private $iv = "";     /**     * 构造，传递二个已经进行base64_encode的KEY与IV     *     * @param string $key     * @param string $iv     */     function __construct ($key, $iv)     {         if (empty($key) || empty($iv)) {             echo 'key and iv is not valid';             exit();         }         $this->key = $key;         $this->iv = $iv;     }     /**     *加密     * @param <type> $value     * @return <type>     */     public function encrypt ($value)     {         $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');         $iv = base64_decode($this->iv);         $value = $this->PaddingPKCS7($value);         $key = base64_decode($this->key);         mcrypt_generic_init($td, $key, $iv);         $ret = base64_encode(mcrypt_generic($td, $value));         mcrypt_generic_deinit($td);         mcrypt_module_close($td);         return $ret;     }     /**     *解密     * @param <type> $value     * @return <type>     */     public function decrypt ($value)     {         $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');         $iv = base64_decode($this->iv);         $key = base64_decode($this->key);         mcrypt_generic_init($td, $key, $iv);         $ret = trim(mdecrypt_generic($td, base64_decode($value)));         $ret = $this->UnPaddingPKCS7($ret);         mcrypt_generic_deinit($td);         mcrypt_module_close($td);         return $ret;     }     /**     *pkcs7补足算法     *     */     private function PaddingPKCS7 ($data)     {         $block_size = mcrypt_get_block_size('tripledes', 'cbc');         $padding_char = $block_size - (strlen($data) % $block_size);         $data .= str_repeat(chr($padding_char), $padding_char);         return $data;     }     private function UnPaddingPKCS7($text)     {         $pad = ord($text{strlen($text) - 1});         if ($pad > strlen($text)) {             return false;         }         if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {             return false;         }         return substr($text, 0, - 1 * $pad);     } }
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