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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.exceptions import InvalidSignature
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import padding, rsa
from .utils import wycheproof_tests
_DIGESTS = {
"SHA-1": hashes.SHA1(),
"SHA-224": hashes.SHA224(),
"SHA-256": hashes.SHA256(),
"SHA-384": hashes.SHA384(),
"SHA-512": hashes.SHA512(),
# Not supported by OpenSSL for RSA signing
"SHA-512/224": None,
"SHA-512/256": None,
"SHA3-224": hashes.SHA3_224(),
"SHA3-256": hashes.SHA3_256(),
"SHA3-384": hashes.SHA3_384(),
"SHA3-512": hashes.SHA3_512(),
}
def should_verify(backend, wycheproof):
if wycheproof.valid:
return True
if wycheproof.acceptable:
return not wycheproof.has_flag("MissingNull")
return False
@wycheproof_tests(
"rsa_signature_test.json",
"rsa_signature_2048_sha224_test.json",
"rsa_signature_2048_sha256_test.json",
"rsa_signature_2048_sha384_test.json",
"rsa_signature_2048_sha512_test.json",
"rsa_signature_2048_sha512_224_test.json",
"rsa_signature_2048_sha512_256_test.json",
"rsa_signature_2048_sha3_224_test.json",
"rsa_signature_2048_sha3_256_test.json",
"rsa_signature_2048_sha3_384_test.json",
"rsa_signature_2048_sha3_512_test.json",
"rsa_signature_3072_sha256_test.json",
"rsa_signature_3072_sha384_test.json",
"rsa_signature_3072_sha512_test.json",
"rsa_signature_3072_sha512_256_test.json",
"rsa_signature_3072_sha3_256_test.json",
"rsa_signature_3072_sha3_384_test.json",
"rsa_signature_3072_sha3_512_test.json",
"rsa_signature_4096_sha384_test.json",
"rsa_signature_4096_sha512_test.json",
"rsa_signature_4096_sha512_256_test.json",
)
def test_rsa_pkcs1v15_signature(backend, wycheproof):
key = serialization.load_der_public_key(
binascii.unhexlify(wycheproof.testgroup["keyDer"]), backend
)
assert isinstance(key, rsa.RSAPublicKey)
digest = _DIGESTS[wycheproof.testgroup["sha"]]
if digest is None or not backend.hash_supported(digest):
pytest.skip(
"Hash {} not supported".format(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,
)
@wycheproof_tests("rsa_sig_gen_misc_test.json")
def test_rsa_pkcs1v15_signature_generation(backend, wycheproof):
key = serialization.load_pem_private_key(
wycheproof.testgroup["privateKeyPem"].encode(),
password=None,
backend=backend,
)
assert isinstance(key, rsa.RSAPrivateKey)
digest = _DIGESTS[wycheproof.testgroup["sha"]]
assert digest is not None
if backend._fips_enabled:
if key.key_size < 2048 or isinstance(digest, hashes.SHA1):
pytest.skip(
"Invalid params for FIPS. key: {} bits, digest: {}".format(
key.key_size, digest.name
)
)
sig = key.sign(
binascii.unhexlify(wycheproof.testcase["msg"]),
padding.PKCS1v15(),
digest,
)
assert sig == binascii.unhexlify(wycheproof.testcase["sig"])
@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_2048_sha512_256_mgf1_28_test.json",
"rsa_pss_2048_sha512_256_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
)
assert isinstance(key, rsa.RSAPublicKey)
digest = _DIGESTS[wycheproof.testgroup["sha"]]
mgf_digest = _DIGESTS[wycheproof.testgroup["mgfSha"]]
if digest is None or mgf_digest is None:
pytest.skip(
"PSS with digest={} and MGF digest={} not supported".format(
wycheproof.testgroup["sha"],
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,
)
@wycheproof_tests(
"rsa_oaep_2048_sha1_mgf1sha1_test.json",
"rsa_oaep_2048_sha224_mgf1sha1_test.json",
"rsa_oaep_2048_sha224_mgf1sha224_test.json",
"rsa_oaep_2048_sha256_mgf1sha1_test.json",
"rsa_oaep_2048_sha256_mgf1sha256_test.json",
"rsa_oaep_2048_sha384_mgf1sha1_test.json",
"rsa_oaep_2048_sha384_mgf1sha384_test.json",
"rsa_oaep_2048_sha512_mgf1sha1_test.json",
"rsa_oaep_2048_sha512_mgf1sha512_test.json",
"rsa_oaep_3072_sha256_mgf1sha1_test.json",
"rsa_oaep_3072_sha256_mgf1sha256_test.json",
"rsa_oaep_3072_sha512_mgf1sha1_test.json",
"rsa_oaep_3072_sha512_mgf1sha512_test.json",
"rsa_oaep_4096_sha256_mgf1sha1_test.json",
"rsa_oaep_4096_sha256_mgf1sha256_test.json",
"rsa_oaep_4096_sha512_mgf1sha1_test.json",
"rsa_oaep_4096_sha512_mgf1sha512_test.json",
"rsa_oaep_misc_test.json",
)
def test_rsa_oaep_encryption(backend, wycheproof):
key = serialization.load_pem_private_key(
wycheproof.testgroup["privateKeyPem"].encode("ascii"),
password=None,
backend=backend,
)
assert isinstance(key, rsa.RSAPrivateKey)
digest = _DIGESTS[wycheproof.testgroup["sha"]]
mgf_digest = _DIGESTS[wycheproof.testgroup["mgfSha"]]
assert digest is not None
assert mgf_digest is not None
padding_algo = padding.OAEP(
mgf=padding.MGF1(algorithm=mgf_digest),
algorithm=digest,
label=binascii.unhexlify(wycheproof.testcase["label"]),
)
if wycheproof.valid or wycheproof.acceptable:
pt = key.decrypt(
binascii.unhexlify(wycheproof.testcase["ct"]), padding_algo
)
assert pt == binascii.unhexlify(wycheproof.testcase["msg"])
else:
with pytest.raises(ValueError):
key.decrypt(
binascii.unhexlify(wycheproof.testcase["ct"]), padding_algo
)
@wycheproof_tests(
"rsa_pkcs1_2048_test.json",
"rsa_pkcs1_3072_test.json",
"rsa_pkcs1_4096_test.json",
)
def test_rsa_pkcs1_encryption(backend, wycheproof):
key = serialization.load_pem_private_key(
wycheproof.testgroup["privateKeyPem"].encode("ascii"),
password=None,
backend=backend,
)
assert isinstance(key, rsa.RSAPrivateKey)
if wycheproof.valid:
pt = key.decrypt(
binascii.unhexlify(wycheproof.testcase["ct"]), padding.PKCS1v15()
)
assert pt == binascii.unhexlify(wycheproof.testcase["msg"])
else:
with pytest.raises(ValueError):
key.decrypt(
binascii.unhexlify(wycheproof.testcase["ct"]),
padding.PKCS1v15(),
)
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