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- # 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.
- """
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