Think/Upload/Driver/Qiniu/QiniuStorage.php
protected static function sign($ak, $sk, $data)
    {
        $sign = hash_hmac('sha1', $data, $sk, true);

        return $ak.':'.static::Qiniu_Encode($sign);
    }
protected static function sign($ak, $sk, $data)
    {
        $sign = hash_hmac('sha1', $data, $sk, true);

        return $ak.':'.static::Qiniu_Encode($sign);
    }
@param $ak
@param $sk
@param $data

@return string