Coverage for /pythoncovmergedfiles/medio/medio/usr/local/lib/python3.8/site-packages/cryptography/hazmat/primitives/kdf/__init__.py: 100%

1# This file is dual licensed under the terms of the Apache License, Version 

2# 2.0, and the BSD License. See the LICENSE file in the root of this repository 

3# for complete details. 

4 

5from __future__ import annotations 

6 

7import abc 

8 

9 

10class KeyDerivationFunction(metaclass=abc.ABCMeta): 

11 @abc.abstractmethod 

12 def derive(self, key_material: bytes) -> bytes: 

13 """ 

14 Deterministically generates and returns a new key based on the existing 

15 key material. 

16 """ 

17 

18 @abc.abstractmethod 

19 def verify(self, key_material: bytes, expected_key: bytes) -> None: 

20 """ 

21 Checks whether the key generated by the key material matches the 

22 expected derived key. Raises an exception if they do not match. 

23 """