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#
# -------------------------------------------------------------------------
# Copyright (c) 2015-2017 AT&T Intellectual Property
#
# 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
import hashlib
from Crypto import Random
from Crypto.Cipher import AES
from oslo_config import cfg
CONF = cfg.CONF
cipher_opts = [
cfg.StrOpt('appkey',
default='ch00se@g003ntropy',
help='Master key to secure other secrets')
]
CONF.register_opts(cipher_opts, group='auth')
class AESCipher(object):
__instance = None
@staticmethod
def get_instance(key = None):
if AESCipher.__instance is None:
print ('Creating the singleton instance')
AESCipher(key)
return AESCipher.__instance
def __init__(self, key=None):
if AESCipher.__instance is not None:
raise Exception("This class is a singleton!")
else:
AESCipher.__instance = self
self.bs = 32
if key is None:
key = CONF.auth.appkey # ---> python3.8 Code version code
# key= CONF.auth.appkey.encode() ---> Python 2.7 version code
# in Python 3+ key is already a b'' type so no need to encode it again.
self.key = hashlib.sha256(key.encode()).digest()
def encrypt(self, raw):
raw = self._pad(raw)
iv = Random.new().read(AES.block_size)
cipher = AES.new(self.key, AES.MODE_CBC, iv)
return base64.b64encode(iv + cipher.encrypt(raw))
def decrypt(self, enc):
enc = base64.b64decode(enc)
iv = enc[:AES.block_size]
cipher = AES.new(self.key, AES.MODE_CBC, iv)
return self._unpad(cipher.decrypt(enc[AES.block_size:])).decode('utf-8')
def _pad(self, s):
return s + (self.bs - len(s) % self.bs) * chr(self.bs - len(s) % self.bs)
@staticmethod
def _unpad(s):
return s[:-ord(s[len(s)-1:])]
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