Parse digests

def parse_signatures_or_digests(self, digest_bytes):
        """ Parse digests """

        if not len(digest_bytes):
            return []
        
        digests = []
        block = io.BytesIO(digest_bytes)

        data_len = self.read_uint32_le(block)
        while block.tell() < data_len:

            algorithm_id = self.read_uint32_le(block)
            digest_len = self.read_uint32_le(block)
            digest = block.read(digest_len)

            digests.append((algorithm_id, digest))

        return digests