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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.exceptions import InvalidSignature
from cryptography.hazmat.backends.interfaces import DHBackend
from cryptography.hazmat.primitives.asymmetric.ed25519 import (
Ed25519PublicKey
)
@pytest.mark.supported(
only_if=lambda backend: backend.ed25519_supported(),
skip_message="Requires OpenSSL with Ed25519 support"
)
@pytest.mark.requires_backend_interface(interface=DHBackend)
@pytest.mark.wycheproof_tests(
"eddsa_test.json",
)
def test_ed25519_signature(backend, wycheproof):
# We want to fail if/when wycheproof adds more edwards curve tests
# so we can add them as well.
assert wycheproof.testgroup["key"]["curve"] == "edwards25519"
key = Ed25519PublicKey.from_public_bytes(
binascii.unhexlify(wycheproof.testgroup["key"]["pk"])
)
if wycheproof.valid or wycheproof.acceptable:
key.verify(
binascii.unhexlify(wycheproof.testcase["sig"]),
binascii.unhexlify(wycheproof.testcase["msg"]),
)
else:
with pytest.raises(InvalidSignature):
key.verify(
binascii.unhexlify(wycheproof.testcase["sig"]),
binascii.unhexlify(wycheproof.testcase["msg"]),
)
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