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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.
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.
"""