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encrypt.py
60 lines
| 2.0 KiB
| text/x-python
|
PythonLexer
r1 | # -*- coding: utf-8 -*- | ||
# Copyright (C) 2014-2016 RhodeCode GmbH | |||
# | |||
# This program is free software: you can redistribute it and/or modify | |||
# it under the terms of the GNU Affero General Public License, version 3 | |||
# (only), as published by the Free Software Foundation. | |||
# | |||
# This program is distributed in the hope that it will be useful, | |||
# but WITHOUT ANY WARRANTY; without even the implied warranty of | |||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |||
# GNU General Public License for more details. | |||
# | |||
# You should have received a copy of the GNU Affero General Public License | |||
# along with this program. If not, see <http://www.gnu.org/licenses/>. | |||
# | |||
# This program is dual-licensed. If you wish to learn more about the | |||
# RhodeCode Enterprise Edition, including its added features, Support services, | |||
# and proprietary license terms, please see https://rhodecode.com/licenses/ | |||
""" | |||
Generic encryption library for RhodeCode | |||
""" | |||
import hashlib | |||
import base64 | |||
from Crypto.Cipher import AES | |||
from Crypto import Random | |||
from rhodecode.lib.utils2 import safe_str | |||
class AESCipher(object): | |||
def __init__(self, key): | |||
# create padding, trim to long enc key | |||
if not key: | |||
raise ValueError('passed key variable is empty') | |||
self.block_size = 32 | |||
self.key = hashlib.sha256(safe_str(key)).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:])) | |||
def _pad(self, s): | |||
return (s + (self.block_size - len(s) % self.block_size) | |||
* chr(self.block_size - len(s) % self.block_size)) | |||
@staticmethod | |||
def _unpad(s): | |||
return s[:-ord(s[len(s)-1:])] |