php暗号化および復号化処理クラス

class SysCrypt {

private $crypt_key;

// 构造関数
public function __construct($crypt_key) {
 $this -> crypt_key = $crypt_key;
}

public function php_encrypt($txt) {
 srand((double)microtime() * 1000000);
 $encrypt_key = md5(rand(0,32000));
 $ctr = 0;
 $tmp = '';
 for($i = 0;$i $ctr = $ctr == strlen($encrypt_key) ? 0 : $ctr;
 $tmp .= $encrypt_key[$ctr].($txt[$i]^$encrypt_key[$ctr++]);
 }
 returnbase64_encode(self::__key($tmp,$this - > crypt_key));
}

 public function php_decrypt($txt) {
 $txt = self::__key(base64_decode($txt),$this -> crypt_key);
 $tmp = '';
 ($i = 0;$i  $md5 = $txt[$i];
 $tmp .= $txt[++$i] ^ $md5;
 }
 return $tmp;
}

プライベート関数 __key($txt,$encrypt_key) {
 $encrypt_key = md5($encrypt_key);
 $ctr = 0;
 $tmp = '';
 for($i = 0 ; $i  $ctr == strlen($encrypt_key) 0 : $ctr;
 $tmp .= $txt[$i] ^ $encrypt_key[$ctr++];
 }
 return $tmp;
}

public function __destruct() {
 $this -> crypt_key = null;
}
}


$sc = new SysCrypt('phpwms');
$text = '110';
print($sc -> php_encrypt($text));
print('< ;br>');
print($sc -> php_decrypt($sc -> php_encrypt($text)));
?>

加密解密、php