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# Copyright 2016-2018 Yubico AB
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Various utility functions used throughout the library."""
from typing import Tuple
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.pbkdf2 import PBKDF2HMAC
def password_to_key(password: str) -> Tuple[bytes, bytes]:
"""Derive keys for establishing a YubiHSM session from a password.
:return: A tuple containing the encryption key, and MAC key.
"""
pw_bytes = password.encode()
key = PBKDF2HMAC(
algorithm=hashes.SHA256(),
length=32,
salt=b"Yubico",
iterations=10000,
backend=default_backend(),
).derive(pw_bytes)
key_enc, key_mac = key[:16], key[16:]
return key_enc, key_mac
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