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Code Editor : pbkdf2.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 annotations import typing from cryptography import utils from cryptography.exceptions import ( AlreadyFinalized, InvalidKey, UnsupportedAlgorithm, _Reasons, ) from cryptography.hazmat.bindings._rust import openssl as rust_openssl from cryptography.hazmat.primitives import constant_time, hashes from cryptography.hazmat.primitives.kdf import KeyDerivationFunction class PBKDF2HMAC(KeyDerivationFunction): def __init__( self, algorithm: hashes.HashAlgorithm, length: int, salt: bytes, iterations: int, backend: typing.Any = None, ): from cryptography.hazmat.backends.openssl.backend import ( backend as ossl, ) if not ossl.pbkdf2_hmac_supported(algorithm): raise UnsupportedAlgorithm( "{} is not supported for PBKDF2 by this backend.".format( algorithm.name ), _Reasons.UNSUPPORTED_HASH, ) self._used = False self._algorithm = algorithm self._length = length utils._check_bytes("salt", salt) self._salt = salt self._iterations = iterations def derive(self, key_material: bytes) -> bytes: if self._used: raise AlreadyFinalized("PBKDF2 instances can only be used once.") self._used = True return rust_openssl.kdf.derive_pbkdf2_hmac( key_material, self._algorithm, self._salt, self._iterations, self._length, ) def verify(self, key_material: bytes, expected_key: bytes) -> None: derived_key = self.derive(key_material) if not constant_time.bytes_eq(derived_key, expected_key): raise InvalidKey("Keys do not match.")
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