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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 annotations import abc class KeyDerivationFunction(metaclass=abc.ABCMeta): @abc.abstractmethod def derive(self, key_material: bytes) -> bytes: """ Deterministically generates and returns a new key based on the existing key material. """ @abc.abstractmethod def verify(self, key_material: bytes, expected_key: bytes) -> None: """ 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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