1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
|
# 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 __future__ import absolute_import, division, print_function
import binascii
import pytest
from cryptography.primitives.block import BlockCipher, ciphers, modes
class TestBlockCipher(object):
def test_instantiate_without_api(self):
BlockCipher(
ciphers.AES(binascii.unhexlify(b"0" * 32)),
modes.CBC(binascii.unhexlify(b"0" * 32))
)
def test_creates_encryptor(self):
cipher = BlockCipher(
ciphers.AES(binascii.unhexlify(b"0" * 32)),
modes.CBC(binascii.unhexlify(b"0" * 32))
)
assert cipher.encryptor() is not None
def test_creates_decryptor(self):
cipher = BlockCipher(
ciphers.AES(binascii.unhexlify(b"0" * 32)),
modes.CBC(binascii.unhexlify(b"0" * 32))
)
assert cipher.decryptor() is not None
class TestBlockCipherContext(object):
def test_use_after_finalize(self, api):
cipher = BlockCipher(
ciphers.AES(binascii.unhexlify(b"0" * 32)),
modes.CBC(binascii.unhexlify(b"0" * 32)),
api
)
encryptor = cipher.encryptor()
encryptor.update(b"a" * 16)
encryptor.finalize()
with pytest.raises(ValueError):
encryptor.update(b"b" * 16)
with pytest.raises(ValueError):
encryptor.finalize()
decryptor = cipher.decryptor()
decryptor.update(b"a" * 16)
decryptor.finalize()
with pytest.raises(ValueError):
decryptor.update(b"b" * 16)
with pytest.raises(ValueError):
decryptor.finalize()
def test_unaligned_block_encryption(self, api):
cipher = BlockCipher(
ciphers.AES(binascii.unhexlify(b"0" * 32)),
modes.ECB(),
api
)
encryptor = cipher.encryptor()
ct = encryptor.update(b"a" * 15)
assert ct == b""
ct += encryptor.update(b"a" * 65)
assert len(ct) == 80
ct += encryptor.finalize()
decryptor = cipher.decryptor()
pt = decryptor.update(ct[:3])
assert pt == b""
pt += decryptor.update(ct[3:])
assert len(pt) == 80
assert pt == b"a" * 80
decryptor.finalize()
|
