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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.asymmetric.x25519 import (
X25519PrivateKey,
X25519PublicKey,
)
from .utils import wycheproof_tests
@pytest.mark.supported(
only_if=lambda backend: backend.x25519_supported(),
skip_message="Requires OpenSSL with X25519 support",
)
@wycheproof_tests("x25519_test.json")
def test_x25519(backend, wycheproof):
assert set(wycheproof.testgroup.items()) == {
("curve", "curve25519"),
("type", "XdhComp"),
}
private_key = X25519PrivateKey.from_private_bytes(
binascii.unhexlify(wycheproof.testcase["private"])
)
public_key = X25519PublicKey.from_public_bytes(
binascii.unhexlify(wycheproof.testcase["public"])
)
assert wycheproof.valid or wycheproof.acceptable
expected = binascii.unhexlify(wycheproof.testcase["shared"])
if expected == b"\x00" * 32:
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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