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# Copyright (c) 2017-2021 by Ron Frederick <ronf@timeheart.net> and others.
#
# This program and the accompanying materials are made available under
# the terms of the Eclipse Public License v2.0 which accompanies this
# distribution and is available at:
#
# http://www.eclipse.org/legal/epl-2.0/
#
# This program may also be made available under the following secondary
# licenses when the conditions for such availability set forth in the
# Eclipse Public License v2.0 are satisfied:
#
# GNU General Public License, Version 2.0, or any later versions of
# that license
#
# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
#
# Contributors:
# Ron Frederick - initial implementation, API, and documentation
"""A shim around PyCA for key derivation functions"""
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
from .misc import hashes
def pbkdf2_hmac(hash_name: str, passphrase: bytes, salt: bytes,
count: int, key_size: int) -> bytes:
"""A shim around PyCA for PBKDF2 HMAC key derivation"""
return PBKDF2HMAC(hashes[hash_name](), key_size, salt,
count).derive(passphrase)