#
# 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.
import base64
from cryptography import fernet
from oslo_config import cfg
from oslo_utils import encodeutils
from zun.common import exception
def encrypt(value, encryption_key=None):
if value is None:
return None
encryption_key = get_valid_encryption_key(encryption_key)
encoded_key = base64.b64encode(encryption_key.encode('utf-8'))
sym = fernet.Fernet(encoded_key)
res = sym.encrypt(encodeutils.safe_encode(value))
return encodeutils.safe_decode(res)
def decrypt(data, encryption_key=None):
if data is None:
return None
encryption_key = get_valid_encryption_key(encryption_key)
encoded_key = base64.b64encode(encryption_key.encode('utf-8'))
sym = fernet.Fernet(encoded_key)
try:
value = sym.decrypt(encodeutils.safe_encode(data))
if value is not None:
return encodeutils.safe_decode(value, 'utf-8')
except fernet.InvalidToken:
raise exception.InvalidEncryptionKey()
def get_valid_encryption_key(encryption_key):
if encryption_key is None:
encryption_key = cfg.CONF.auth_encryption_key
return encryption_key[:32]
