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
|
# 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 os
import pytest
from cryptography.hazmat.backends.interfaces import HashBackend
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.x963kdf import X963KDF
from ...doubles import DummyHashAlgorithm
from ...utils import load_vectors_from_file, load_x963_vectors
def _skip_hashfn_unsupported(backend, hashfn):
if not backend.hash_supported(hashfn):
pytest.skip(
"Hash {} is not supported by this backend {}".format(
hashfn.name, backend
)
)
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestX963(object):
_algorithms_dict = {
"SHA-1": hashes.SHA1,
"SHA-224": hashes.SHA224,
"SHA-256": hashes.SHA256,
"SHA-384": hashes.SHA384,
"SHA-512": hashes.SHA512,
}
@pytest.mark.parametrize(
("vector"),
load_vectors_from_file(
os.path.join("KDF", "ansx963_2001.txt"), load_x963_vectors
),
)
def test_x963(self, backend, vector):
hashfn = self._algorithms_dict[vector["hash"]]
_skip_hashfn_unsupported(backend, hashfn())
key = binascii.unhexlify(vector["Z"])
sharedinfo = None
if vector["sharedinfo_length"] != 0:
sharedinfo = binascii.unhexlify(vector["sharedinfo"])
key_data_len = vector["key_data_length"] // 8
key_data = binascii.unhexlify(vector["key_data"])
xkdf = X963KDF(
algorithm=hashfn(),
length=key_data_len,
sharedinfo=sharedinfo,
backend=backend,
)
xkdf.verify(key, key_data)
def test_unsupported_hash(self, backend):
with pytest.raises(pytest.skip.Exception):
_skip_hashfn_unsupported(backend, DummyHashAlgorithm())
|
