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# 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 import default_backend
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=default_backend())
xkdf.verify(key, key_data)
def test_unsupported_hash(self, backend):
with pytest.raises(pytest.skip.Exception):
_skip_hashfn_unsupported(backend, DummyHashAlgorithm())
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