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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 RSABackend
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import padding
_DIGESTS = {
"SHA-1": hashes.SHA1(),
"SHA-224": hashes.SHA224(),
"SHA-256": hashes.SHA256(),
"SHA-384": hashes.SHA384(),
"SHA-512": hashes.SHA512(),
}
def should_verify(backend, wycheproof):
if wycheproof.valid:
return True
if wycheproof.acceptable:
if (
(
backend._lib.CRYPTOGRAPHY_OPENSSL_110_OR_GREATER or
backend._lib.CRYPTOGRAPHY_LIBRESSL_28_OR_GREATER
) and wycheproof.has_flag("MissingNull")
):
return False
return True
return False
@pytest.mark.requires_backend_interface(interface=RSABackend)
@pytest.mark.supported(
only_if=lambda backend: (
not backend._lib.CRYPTOGRAPHY_OPENSSL_LESS_THAN_102 or
backend._lib.CRYPTOGRAPHY_LIBRESSL_28_OR_GREATER
),
skip_message=(
"Many of these tests fail on OpenSSL < 1.0.2 and since upstream isn't"
" maintaining it, they'll never be fixed."
),
)
@pytest.mark.wycheproof_tests(
"rsa_signature_test.json",
"rsa_signature_2048_sha224_test.json",
"rsa_signature_2048_sha256_test.json",
"rsa_signature_2048_sha512_test.json",
"rsa_signature_3072_sha256_test.json",
"rsa_signature_3072_sha384_test.json",
"rsa_signature_3072_sha512_test.json",
"rsa_signature_4096_sha384_test.json",
"rsa_signature_4096_sha512_test.json",
)
def test_rsa_pkcs1v15_signature(backend, wycheproof):
key = serialization.load_der_public_key(
binascii.unhexlify(wycheproof.testgroup["keyDer"]), backend
)
digest = _DIGESTS[wycheproof.testgroup["sha"]]
if should_verify(backend, wycheproof):
key.verify(
binascii.unhexlify(wycheproof.testcase["sig"]),
binascii.unhexlify(wycheproof.testcase["msg"]),
padding.PKCS1v15(),
digest,
)
else:
with pytest.raises(InvalidSignature):
key.verify(
binascii.unhexlify(wycheproof.testcase["sig"]),
binascii.unhexlify(wycheproof.testcase["msg"]),
padding.PKCS1v15(),
digest,
)
@pytest.mark.requires_backend_interface(interface=RSABackend)
@pytest.mark.wycheproof_tests(
"rsa_pss_2048_sha1_mgf1_20_test.json",
"rsa_pss_2048_sha256_mgf1_0_test.json",
"rsa_pss_2048_sha256_mgf1_32_test.json",
"rsa_pss_3072_sha256_mgf1_32_test.json",
"rsa_pss_4096_sha256_mgf1_32_test.json",
"rsa_pss_4096_sha512_mgf1_32_test.json",
"rsa_pss_misc_test.json",
)
def test_rsa_pss_signature(backend, wycheproof):
key = serialization.load_der_public_key(
binascii.unhexlify(wycheproof.testgroup["keyDer"]), backend
)
digest = _DIGESTS[wycheproof.testgroup["sha"]]
mgf_digest = _DIGESTS[wycheproof.testgroup["mgfSha"]]
if wycheproof.valid or wycheproof.acceptable:
key.verify(
binascii.unhexlify(wycheproof.testcase["sig"]),
binascii.unhexlify(wycheproof.testcase["msg"]),
padding.PSS(
mgf=padding.MGF1(mgf_digest),
salt_length=wycheproof.testgroup["sLen"]
),
digest
)
else:
with pytest.raises(InvalidSignature):
key.verify(
binascii.unhexlify(wycheproof.testcase["sig"]),
binascii.unhexlify(wycheproof.testcase["msg"]),
padding.PSS(
mgf=padding.MGF1(mgf_digest),
salt_length=wycheproof.testgroup["sLen"]
),
digest
)
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