__init__.py 文件源码

def _encrypted_data_keys_hash(hasher, encrypted_data_keys):
    """Generates the expected hash for the provided encrypted data keys.

    :param hasher: Existing hasher to use
    :type hasher: cryptography.hazmat.primitives.hashes.Hash
    :param iterable encrypted_data_keys: Encrypted data keys to hash
    :returns: Concatenated, sorted, list of all hashes
    :rtype: bytes
    """
    hashed_keys = []
    for edk in encrypted_data_keys:
        serialized_edk = serialize_encrypted_data_key(edk)
        _hasher = hasher.copy()
        _hasher.update(serialized_edk)
        hashed_keys.append(_hasher.finalize())
    return b''.join(sorted(hashed_keys))


# 512 bits of 0 for padding between hashes in decryption materials cache ID generation.