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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.
import binascii
import os
import typing
import pytest
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(
f"Hash {hashfn.name} is not supported by this backend {backend}"
)
class TestX963:
_algorithms_dict: typing.ClassVar[
typing.Dict[str, typing.Type[hashes.HashAlgorithm]]
] = {
"SHA-1": hashes.SHA1,
"SHA-224": hashes.SHA224,
"SHA-256": hashes.SHA256,
"SHA-384": hashes.SHA384,
"SHA-512": hashes.SHA512,
}
def test_x963(self, backend, subtests):
vectors = load_vectors_from_file(
os.path.join("KDF", "ansx963_2001.txt"), load_x963_vectors
)
for vector in vectors:
with subtests.test():
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())
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