ee2d212f81
* Reorder imports * Remove unused code * Add missing copyright header in glance.api.v1.members * Pass in 'pool' to glance.store.scrubber.Scrubber._cleanup * Fix NameError in glance.api.v1.images.Controller: request -> req * Fix except block in glance.notifier to properly catch multiple exceptions Change-Id: I30d895b5ff1246e8d637720ef2f4aacab9cf7ede
69 lines
2.2 KiB
Python
69 lines
2.2 KiB
Python
#!/usr/bin/env python
|
|
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright 2011 OpenStack LLC.
|
|
# All Rights Reserved.
|
|
#
|
|
# 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.
|
|
|
|
"""
|
|
Routines for URL-safe encrypting/decrypting
|
|
"""
|
|
|
|
import base64
|
|
|
|
from Crypto.Cipher import AES
|
|
from Crypto import Random
|
|
from Crypto.Random import random
|
|
|
|
|
|
def urlsafe_encrypt(key, plaintext, blocksize=16):
|
|
"""
|
|
Encrypts plaintext. Resulting ciphertext will contain URL-safe characters
|
|
:param key: AES secret key
|
|
:param plaintext: Input text to be encrypted
|
|
:param blocksize: Non-zero integer multiple of AES blocksize in bytes (16)
|
|
|
|
:returns : Resulting ciphertext
|
|
"""
|
|
def pad(text):
|
|
"""
|
|
Pads text to be encrypted
|
|
"""
|
|
pad_length = (blocksize - len(text) % blocksize)
|
|
sr = random.StrongRandom()
|
|
pad = ''.join(chr(sr.randint(1, 0xFF)) for i in range(pad_length - 1))
|
|
# We use chr(0) as a delimiter between text and padding
|
|
return text + chr(0) + pad
|
|
|
|
# random initial 16 bytes for CBC
|
|
init_vector = Random.get_random_bytes(16)
|
|
cypher = AES.new(key, AES.MODE_CBC, init_vector)
|
|
padded = cypher.encrypt(pad(str(plaintext)))
|
|
return base64.urlsafe_b64encode(init_vector + padded)
|
|
|
|
|
|
def urlsafe_decrypt(key, ciphertext):
|
|
"""
|
|
Decrypts URL-safe base64 encoded ciphertext
|
|
:param key: AES secret key
|
|
:param ciphertext: The encrypted text to decrypt
|
|
|
|
:returns : Resulting plaintext
|
|
"""
|
|
# Cast from unicode
|
|
ciphertext = base64.urlsafe_b64decode(str(ciphertext))
|
|
cypher = AES.new(key, AES.MODE_CBC, ciphertext[:16])
|
|
padded = cypher.decrypt(ciphertext[16:])
|
|
return padded[:padded.rfind(chr(0))]
|