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# -*- coding: utf-8 -*-
# test_crypto2.py
# Copyright (C) 2016 LEAP Encryption Access Project
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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 General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Tests for the _crypto module
"""
import StringIO
import leap.soledad.client
from leap.soledad.client import _crypto
from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
from cryptography.hazmat.backends import default_backend
def _aes_encrypt(key, iv, data):
backend = default_backend()
cipher = Cipher(algorithms.AES(key), modes.CTR(iv), backend=backend)
encryptor = cipher.encryptor()
return encryptor.update(data) + encryptor.finalize()
def test_chunked_encryption():
key = 'A' * 32
iv = 'A' * 16
data = (
"You can't come up against "
"the world's most powerful intelligence "
"agencies and not accept the risk. "
"If they want to get you, over time "
"they will.")
fd = StringIO.StringIO()
aes = _crypto.AESWriter(key, fd, iv)
block = 16
for i in range(len(data)/block):
chunk = data[i * block:(i+1)*block]
aes.write(chunk)
aes.end()
ciphertext_chunked = fd.getvalue()
ciphertext = _aes_encrypt(key, iv, data)
assert ciphertext_chunked == ciphertext
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