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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 pytest
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.kdf.hkdf import HKDF
from .utils import wycheproof_tests
_HASH_ALGORITHMS = {
"HKDF-SHA-1": hashes.SHA1(),
"HKDF-SHA-256": hashes.SHA256(),
"HKDF-SHA-384": hashes.SHA384(),
"HKDF-SHA-512": hashes.SHA512(),
}
@wycheproof_tests(
"hkdf_sha1_test.json",
"hkdf_sha256_test.json",
"hkdf_sha384_test.json",
"hkdf_sha512_test.json",
)
def test_hkdf(backend, wycheproof):
hash_algo = _HASH_ALGORITHMS[wycheproof.testfiledata["algorithm"]]
if wycheproof.invalid:
with pytest.raises(ValueError):
HKDF(
algorithm=hash_algo,
length=wycheproof.testcase["size"],
salt=binascii.unhexlify(wycheproof.testcase["salt"]),
info=binascii.unhexlify(wycheproof.testcase["info"]),
backend=backend,
)
return
h = HKDF(
algorithm=hash_algo,
length=wycheproof.testcase["size"],
salt=binascii.unhexlify(wycheproof.testcase["salt"]),
info=binascii.unhexlify(wycheproof.testcase["info"]),
backend=backend,
)
result = h.derive(binascii.unhexlify(wycheproof.testcase["ikm"]))
assert result == binascii.unhexlify(wycheproof.testcase["okm"])
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