def get_cloud_checksum(
            self,
            bucket: str,
            key: str
    ) -> str:
        """
        Retrieves the cloud-provided checksum for a given object in a given bucket.
        :param bucket: the bucket the object resides in.
        :param key: the key of the object for which checksum is being retrieved.
        :return: the cloud-provided checksum
        """
        blob_obj = self._get_blob_obj(bucket, key)
        return self.compute_cloud_checksum(blob_obj)
Retrieves the cloud-provided checksum for a given object in a given bucket.
        :param bucket: the bucket the object resides in.
        :param key: the key of the object for which checksum is being retrieved.
        :return: the cloud-provided checksum