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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 base64
import binascii
import time
import struct
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
from twisted.trial import unittest
snowden1 = (
"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.")
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 _aes_decrypt(key, iv, data):
backend = default_backend()
cipher = Cipher(algorithms.AES(key), modes.CTR(iv), backend=backend)
decryptor = cipher.decryptor()
return decryptor.update(data) + decryptor.finalize()
def test_chunked_encryption():
key = 'A' * 32
iv = 'A' * 16
fd = StringIO.StringIO()
aes = _crypto.AESEncryptor(key, iv, fd)
data = snowden1
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
def test_decrypt():
key = 'A' * 32
iv = 'A' * 16
data = snowden1
block = 16
ciphertext = _aes_encrypt(key, iv, data)
fd = StringIO.StringIO()
aes = _crypto.AESDecryptor(key, iv, fd)
for i in range(len(ciphertext)/block):
chunk = ciphertext[i * block:(i+1)*block]
aes.write(chunk)
aes.end()
cleartext_chunked = fd.getvalue()
assert cleartext_chunked == data
class BlobTestCase(unittest.TestCase):
class doc_info:
doc_id = 'D-deadbeef'
rev = '397932e0c77f45fcb7c3732930e7e9b2:1'
def test_blob_encryptor(self):
inf = StringIO.StringIO()
inf.write(snowden1)
inf.seek(0)
outf = StringIO.StringIO()
blob = _crypto.BlobEncryptor(
self.doc_info, inf, result=outf,
secret='A' * 96, iv='B'*16)
d = blob.encrypt()
d.addCallback(self._test_blob_encryptor_cb, outf)
return d
def _test_blob_encryptor_cb(self, _, outf):
encrypted = outf.getvalue()
data = base64.urlsafe_b64decode(encrypted)
assert data[0] == '\x80'
ts, sch, meth = struct.unpack(
'Qbb', data[1:11])
assert sch == 1
assert meth == 1
iv = data[11:27]
assert iv == 'B' * 16
doc_id = data[27:37]
assert doc_id == 'D-deadbeef'
rev = data[37:71]
assert rev == self.doc_info.rev
ciphertext = data[71:-64]
aes_key = _crypto._get_sym_key_for_doc(
self.doc_info.doc_id, 'A'*96)
assert ciphertext == _aes_encrypt(aes_key, 'B'*16, snowden1)
decrypted = _aes_decrypt(aes_key, 'B'*16, ciphertext)
assert str(decrypted) == snowden1
def test_blob_decryptor(self):
inf = StringIO.StringIO()
inf.write(snowden1)
inf.seek(0)
outf = StringIO.StringIO()
blob = _crypto.BlobEncryptor(
self.doc_info, inf, result=outf,
secret='A' * 96, iv='B' * 16)
def do_decrypt(_, outf):
decryptor = _crypto.BlobDecryptor(
self.doc_info, outf,
secret='A' * 96)
d = decryptor.decrypt()
return d
d = blob.encrypt()
d.addCallback(do_decrypt, outf)
d.addCallback(self._test_blob_decryptor_cb)
return d
def _test_blob_decryptor_cb(self, decrypted):
assert decrypted.getvalue() == snowden1
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