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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, UnsupportedAlgorithm
from cryptography.hazmat.backends.interfaces import EllipticCurveBackend
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import ec
_DIGESTS = {
"SHA-1": hashes.SHA1(),
"SHA-224": hashes.SHA224(),
"SHA-256": hashes.SHA256(),
"SHA-384": hashes.SHA384(),
"SHA-512": hashes.SHA512(),
"SHA3-224": hashes.SHA3_224(),
"SHA3-256": hashes.SHA3_256(),
"SHA3-384": hashes.SHA3_384(),
"SHA3-512": hashes.SHA3_512(),
}
@pytest.mark.requires_backend_interface(interface=EllipticCurveBackend)
@pytest.mark.wycheproof_tests(
"ecdsa_test.json",
"ecdsa_brainpoolP224r1_sha224_test.json",
"ecdsa_brainpoolP256r1_sha256_test.json",
"ecdsa_brainpoolP320r1_sha384_test.json",
"ecdsa_brainpoolP384r1_sha384_test.json",
"ecdsa_brainpoolP512r1_sha512_test.json",
"ecdsa_secp224r1_sha224_test.json",
"ecdsa_secp224r1_sha256_test.json",
"ecdsa_secp224r1_sha512_test.json",
"ecdsa_secp224r1_sha3_224_test.json",
"ecdsa_secp224r1_sha3_256_test.json",
"ecdsa_secp224r1_sha3_512_test.json",
"ecdsa_secp256k1_sha256_test.json",
"ecdsa_secp256k1_sha512_test.json",
"ecdsa_secp256k1_sha3_256_test.json",
"ecdsa_secp256k1_sha3_512_test.json",
"ecdsa_secp256r1_sha256_test.json",
"ecdsa_secp256r1_sha512_test.json",
"ecdsa_secp256r1_sha3_256_test.json",
"ecdsa_secp256r1_sha3_512_test.json",
"ecdsa_secp384r1_sha384_test.json",
"ecdsa_secp384r1_sha512_test.json",
"ecdsa_secp384r1_sha3_384_test.json",
"ecdsa_secp384r1_sha3_512_test.json",
"ecdsa_secp521r1_sha512_test.json",
"ecdsa_secp521r1_sha3_512_test.json",
)
def test_ecdsa_signature(backend, wycheproof):
try:
key = serialization.load_der_public_key(
binascii.unhexlify(wycheproof.testgroup["keyDer"]), backend
)
except (UnsupportedAlgorithm, ValueError):
# In some OpenSSL 1.0.2s, some keys fail to load with ValueError,
# instead of Unsupported Algorithm. We can remove handling for that
# exception when we drop support.
pytest.skip(
"unable to load key (curve {})".format(
wycheproof.testgroup["key"]["curve"]
)
)
digest = _DIGESTS[wycheproof.testgroup["sha"]]
if not backend.hash_supported(digest):
pytest.skip("Hash {} not supported".format(digest))
if (
wycheproof.valid or
(wycheproof.acceptable and not wycheproof.has_flag("MissingZero"))
):
key.verify(
binascii.unhexlify(wycheproof.testcase["sig"]),
binascii.unhexlify(wycheproof.testcase["msg"]),
ec.ECDSA(digest),
)
else:
with pytest.raises(InvalidSignature):
key.verify(
binascii.unhexlify(wycheproof.testcase["sig"]),
binascii.unhexlify(wycheproof.testcase["msg"]),
ec.ECDSA(digest),
)
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