File Content: __init__.py # This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function import abc import six @six.add_metaclass(abc.ABCMeta) class KeyDerivationFunction(object): @abc.abstractmethod def derive(self, key_material): """ Deterministically generates and returns a new key based on the existing key material. """ @abc.abstractmethod def verify(self, key_material, expected_key): """ Checks whether the key generated by the key material matches the expected derived key. Raises an exception if they do not match. """ Submit