php - 我无法打开解密的 Amazon Selling Partner Feed 文档

Question

当我尝试读取文件时，我看到了这张图片。这是正常的吗？

我的代码

 public function openTheFeedDocument() {

        $data = json_decode($this->getFeedDocument());

        $url = $data->payload->url;
        $iv  = base64_decode($data->payload->encryptionDetails->initializationVector);
        $key = base64_decode($data->payload->encryptionDetails->key);

        $decryptedData = openssl_decrypt(file_get_contents($url), 'AES-256-CBC', $key, OPENSSL_RAW_DATA, $iv);

        $raw_document =  mb_convert_encoding($decryptedData, 'UTF-8', 'ASCII, JIS, UTF-8, SJIS');

        echo $raw_document;
    }