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#
# -------------------------------------------------------------------------
# Copyright (C) 2020 Wipro Limited.
#
# 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.
#
# -------------------------------------------------------------------------
from Crypto.Cipher import AES
from osdf.config.base import osdf_config
from Crypto.Util.Padding import unpad
from Crypto.Util.Padding import pad
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 = osdf_config.deployment["appkey"]
self.key = key.encode()
def encrypt(self, data):
data = data.encode()
cipher = AES.new(self.key, AES.MODE_CBC)
ciphered_data = cipher.encrypt(pad(data, AES.block_size))
enc = (cipher.iv.hex())+(ciphered_data.hex())
return enc
def decrypt(self, enc):
iv = bytes.fromhex(enc[:32])
ciphered_data = bytes.fromhex(enc[32:])
cipher = AES.new(self.key, AES.MODE_CBC, iv=iv)
original_data = unpad(cipher.decrypt(ciphered_data), AES.block_size).decode()
return original_data
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