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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 pytest
from cryptography.hazmat.primitives.asymmetric.x448 import (
X448PrivateKey, X448PublicKey
)
@pytest.mark.supported(
only_if=lambda backend: backend.x448_supported(),
skip_message="Requires OpenSSL with X448 support"
)
@pytest.mark.wycheproof_tests("x448_test.json")
def test_x448(backend, wycheproof):
assert set(wycheproof.testgroup.items()) == {
("curve", "curve448"), ("type", "XdhComp")
}
private_key = X448PrivateKey.from_private_bytes(
binascii.unhexlify(wycheproof.testcase["private"])
)
public_key_bytes = binascii.unhexlify(wycheproof.testcase["public"])
if len(public_key_bytes) == 57:
assert wycheproof.acceptable
assert wycheproof.has_flag("NonCanonicalPublic")
with pytest.raises(ValueError):
X448PublicKey.from_public_bytes(public_key_bytes)
return
public_key = X448PublicKey.from_public_bytes(public_key_bytes)
assert wycheproof.valid or wycheproof.acceptable
expected = binascii.unhexlify(wycheproof.testcase["shared"])
if expected == b"\x00" * 56:
assert wycheproof.acceptable
# OpenSSL returns an error on all zeros shared key
with pytest.raises(ValueError):
private_key.exchange(public_key)
else:
assert private_key.exchange(public_key) == expected
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