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
|
# 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.
import binascii
import pytest
from cryptography.exceptions import InvalidSignature
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import dsa
from .utils import wycheproof_tests
_DIGESTS = {
"SHA-1": hashes.SHA1(),
"SHA-224": hashes.SHA224(),
"SHA-256": hashes.SHA256(),
}
@pytest.mark.supported(
only_if=lambda backend: backend.dsa_supported(),
skip_message="Requires OpenSSL with DSA support",
)
@wycheproof_tests(
"dsa_test.json",
"dsa_2048_224_sha224_test.json",
"dsa_2048_224_sha256_test.json",
"dsa_2048_256_sha256_test.json",
"dsa_3072_256_sha256_test.json",
)
def test_dsa_signature(backend, wycheproof):
key = serialization.load_der_public_key(
binascii.unhexlify(wycheproof.testgroup["keyDer"]), backend
)
assert isinstance(key, dsa.DSAPublicKey)
digest = _DIGESTS[wycheproof.testgroup["sha"]]
if wycheproof.valid or (
wycheproof.acceptable and not wycheproof.has_flag("NoLeadingZero")
):
key.verify(
binascii.unhexlify(wycheproof.testcase["sig"]),
binascii.unhexlify(wycheproof.testcase["msg"]),
digest,
)
else:
with pytest.raises(InvalidSignature):
key.verify(
binascii.unhexlify(wycheproof.testcase["sig"]),
binascii.unhexlify(wycheproof.testcase["msg"]),
digest,
)
|
