forked from pyca/cryptography
-
Notifications
You must be signed in to change notification settings - Fork 0
/
test_aes.py
96 lines (84 loc) · 3.78 KB
/
test_aes.py
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
86
87
88
89
90
91
92
93
94
95
96
# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.
from __future__ import absolute_import, division, print_function
import binascii
import pytest
from cryptography.hazmat.backends.interfaces import CipherBackend
from cryptography.hazmat.primitives import padding
from cryptography.hazmat.primitives.ciphers import (
Cipher, algorithms, modes
)
from cryptography.hazmat.primitives.ciphers.aead import AESGCM
@pytest.mark.requires_backend_interface(interface=CipherBackend)
@pytest.mark.wycheproof_tests("aes_cbc_pkcs5_test.json")
def test_aes_cbc_pkcs5(backend, wycheproof):
key = binascii.unhexlify(wycheproof.testcase["key"])
iv = binascii.unhexlify(wycheproof.testcase["iv"])
msg = binascii.unhexlify(wycheproof.testcase["msg"])
ct = binascii.unhexlify(wycheproof.testcase["ct"])
padder = padding.PKCS7(128).padder()
cipher = Cipher(algorithms.AES(key), modes.CBC(iv), backend)
enc = cipher.encryptor()
computed_ct = enc.update(
padder.update(msg) + padder.finalize()) + enc.finalize()
dec = cipher.decryptor()
padded_msg = dec.update(ct) + dec.finalize()
unpadder = padding.PKCS7(128).unpadder()
if wycheproof.valid or wycheproof.acceptable:
assert computed_ct == ct
computed_msg = unpadder.update(padded_msg) + unpadder.finalize()
assert computed_msg == msg
else:
assert computed_ct != ct
with pytest.raises(ValueError):
unpadder.update(padded_msg) + unpadder.finalize()
@pytest.mark.requires_backend_interface(interface=CipherBackend)
@pytest.mark.wycheproof_tests("aes_gcm_test.json")
def test_aes_gcm(backend, wycheproof):
key = binascii.unhexlify(wycheproof.testcase["key"])
iv = binascii.unhexlify(wycheproof.testcase["iv"])
aad = binascii.unhexlify(wycheproof.testcase["aad"])
msg = binascii.unhexlify(wycheproof.testcase["msg"])
ct = binascii.unhexlify(wycheproof.testcase["ct"])
tag = binascii.unhexlify(wycheproof.testcase["tag"])
if wycheproof.valid or wycheproof.acceptable:
enc = Cipher(algorithms.AES(key), modes.GCM(iv), backend).encryptor()
enc.authenticate_additional_data(aad)
computed_ct = enc.update(msg) + enc.finalize()
computed_tag = enc.tag
assert computed_ct == ct
assert computed_tag == tag
dec = Cipher(
algorithms.AES(key),
modes.GCM(iv, tag, min_tag_length=len(tag)),
backend
).decryptor()
dec.authenticate_additional_data(aad)
computed_msg = dec.update(ct) + dec.finalize()
assert computed_msg == msg
else:
# All invalid GCM tests are IV len 0 right now
assert len(iv) == 0
with pytest.raises(ValueError):
Cipher(algorithms.AES(key), modes.GCM(iv), backend)
@pytest.mark.requires_backend_interface(interface=CipherBackend)
@pytest.mark.wycheproof_tests("aes_gcm_test.json")
def test_aes_gcm_aead_api(backend, wycheproof):
key = binascii.unhexlify(wycheproof.testcase["key"])
iv = binascii.unhexlify(wycheproof.testcase["iv"])
aad = binascii.unhexlify(wycheproof.testcase["aad"])
msg = binascii.unhexlify(wycheproof.testcase["msg"])
ct = binascii.unhexlify(wycheproof.testcase["ct"])
tag = binascii.unhexlify(wycheproof.testcase["tag"])
aesgcm = AESGCM(key)
if wycheproof.valid or wycheproof.acceptable:
computed_ct = aesgcm.encrypt(iv, msg, aad)
assert computed_ct == ct + tag
computed_msg = aesgcm.decrypt(iv, ct + tag, aad)
assert computed_msg == msg
else:
# All invalid GCM tests are IV len 0 right now
assert len(iv) == 0
with pytest.raises(ValueError):
aesgcm.encrypt(iv, msg, aad)