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test_rsa.py
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test_rsa.py
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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 copy
import itertools
import os
import pytest
from cryptography.exceptions import (
InvalidSignature,
UnsupportedAlgorithm,
_Reasons,
)
from cryptography.hazmat.primitives import hashes, serialization
from cryptography.hazmat.primitives.asymmetric import padding, rsa
from cryptography.hazmat.primitives.asymmetric import utils as asym_utils
from cryptography.hazmat.primitives.asymmetric.rsa import (
RSAPrivateNumbers,
RSAPublicNumbers,
)
from ...doubles import (
DummyAsymmetricPadding,
DummyHashAlgorithm,
DummyKeySerializationEncryption,
)
from ...utils import (
load_nist_vectors,
load_pkcs1_vectors,
load_rsa_nist_vectors,
load_vectors_from_file,
raises_unsupported_algorithm,
)
from .fixtures_rsa import (
RSA_KEY_512,
RSA_KEY_522,
RSA_KEY_599,
RSA_KEY_745,
RSA_KEY_1024,
RSA_KEY_1025,
RSA_KEY_1026,
RSA_KEY_1027,
RSA_KEY_1028,
RSA_KEY_1029,
RSA_KEY_1030,
RSA_KEY_1031,
RSA_KEY_1536,
RSA_KEY_2048,
RSA_KEY_2048_ALT,
RSA_KEY_CORRUPTED,
)
from .utils import (
_check_rsa_private_numbers,
generate_rsa_verification_test,
skip_fips_traditional_openssl,
)
@pytest.fixture(scope="session")
def rsa_key_512() -> rsa.RSAPrivateKey:
return RSA_KEY_512.private_key(unsafe_skip_rsa_key_validation=True)
@pytest.fixture(scope="session")
def rsa_key_2048() -> rsa.RSAPrivateKey:
return RSA_KEY_2048.private_key(unsafe_skip_rsa_key_validation=True)
class DummyMGF(padding.MGF):
_salt_length = 0
_algorithm = hashes.SHA1()
def _check_fips_key_length(backend, private_key):
if (
backend._fips_enabled
and private_key.key_size < backend._fips_rsa_min_key_size
):
pytest.skip(f"Key size not FIPS compliant: {private_key.key_size}")
def _flatten_pkcs1_examples(vectors):
flattened_vectors = []
for vector in vectors:
examples = vector[0].pop("examples")
for example in examples:
merged_vector = (vector[0], vector[1], example)
flattened_vectors.append(merged_vector)
return flattened_vectors
def _build_oaep_sha2_vectors():
base_path = os.path.join("asymmetric", "RSA", "oaep-custom")
vectors = []
hashalgs = [
hashes.SHA1(),
hashes.SHA224(),
hashes.SHA256(),
hashes.SHA384(),
hashes.SHA512(),
]
for mgf1alg, oaepalg in itertools.product(hashalgs, hashalgs):
if mgf1alg.name == "sha1" and oaepalg.name == "sha1":
# We need to generate the cartesian product of the permutations
# of all the SHAs above, but SHA1/SHA1 is something we already
# tested previously and thus did not generate custom vectors for.
continue
examples = _flatten_pkcs1_examples(
load_vectors_from_file(
os.path.join(
base_path,
f"oaep-{mgf1alg.name}-{oaepalg.name}.txt",
),
load_pkcs1_vectors,
)
)
# We've loaded the files, but the loaders don't give us any information
# about the mgf1 or oaep hash algorithms. We know this info so we'll
# just add that to the end of the tuple
for private, public, vector in examples:
vectors.append((private, public, vector, mgf1alg, oaepalg))
return vectors
def _skip_pss_hash_algorithm_unsupported(backend, hash_alg):
if not backend.rsa_padding_supported(
padding.PSS(
mgf=padding.MGF1(hash_alg), salt_length=padding.PSS.MAX_LENGTH
)
):
pytest.skip(f"Does not support {hash_alg.name} in MGF1 using PSS.")
def test_skip_pss_hash_algorithm_unsupported(backend):
with pytest.raises(pytest.skip.Exception):
_skip_pss_hash_algorithm_unsupported(backend, DummyHashAlgorithm())
def test_modular_inverse():
p = int(
"d1f9f6c09fd3d38987f7970247b85a6da84907753d42ec52bc23b745093f4fff5cff3"
"617ce43d00121a9accc0051f519c76e08cf02fc18acfe4c9e6aea18da470a2b611d2e"
"56a7b35caa2c0239bc041a53cc5875ca0b668ae6377d4b23e932d8c995fd1e58ecfd8"
"c4b73259c0d8a54d691cca3f6fb85c8a5c1baf588e898d481",
16,
)
q = int(
"d1519255eb8f678c86cfd06802d1fbef8b664441ac46b73d33d13a8404580a33a8e74"
"cb2ea2e2963125b3d454d7a922cef24dd13e55f989cbabf64255a736671f4629a47b5"
"b2347cfcd669133088d1c159518531025297c2d67c9da856a12e80222cd03b4c6ec0f"
"86c957cb7bb8de7a127b645ec9e820aa94581e4762e209f01",
16,
)
assert rsa._modinv(q, p) == int(
"0275e06afa722999315f8f322275483e15e2fb46d827b17800f99110b269a6732748f"
"624a382fa2ed1ec68c99f7fc56fb60e76eea51614881f497ba7034c17dde955f92f15"
"772f8b2b41f3e56d88b1e096cdd293eba4eae1e82db815e0fadea0c4ec971bc6fd875"
"c20e67e48c31a611e98d32c6213ae4c4d7b53023b2f80c538",
16,
)
class TestRSA:
@pytest.mark.parametrize(
("public_exponent", "key_size"),
itertools.product(
(3, 65537),
(1024, 1536, 2048),
),
)
def test_generate_rsa_keys(self, backend, public_exponent, key_size):
if backend._fips_enabled:
if key_size < backend._fips_rsa_min_key_size:
pytest.skip(f"Key size not FIPS compliant: {key_size}")
if public_exponent < backend._fips_rsa_min_public_exponent:
pytest.skip(f"Exponent not FIPS compliant: {public_exponent}")
skey = rsa.generate_private_key(public_exponent, key_size, backend)
assert skey.key_size == key_size
_check_rsa_private_numbers(skey.private_numbers())
pkey = skey.public_key()
assert isinstance(pkey.public_numbers(), rsa.RSAPublicNumbers)
def test_generate_bad_public_exponent(self, backend):
with pytest.raises(ValueError):
rsa.generate_private_key(
public_exponent=1, key_size=2048, backend=backend
)
with pytest.raises(ValueError):
rsa.generate_private_key(
public_exponent=4, key_size=2048, backend=backend
)
with pytest.raises(ValueError):
rsa.generate_private_key(
public_exponent=65535, key_size=2048, backend=backend
)
def test_cant_generate_insecure_tiny_key(self, backend):
with pytest.raises(ValueError):
rsa.generate_private_key(
public_exponent=65537, key_size=511, backend=backend
)
with pytest.raises(ValueError):
rsa.generate_private_key(
public_exponent=65537, key_size=256, backend=backend
)
@pytest.mark.parametrize(
"pkcs1_example",
load_vectors_from_file(
os.path.join(
"asymmetric", "RSA", "pkcs-1v2-1d2-vec", "pss-vect.txt"
),
load_pkcs1_vectors,
),
)
def test_load_pss_vect_example_keys(self, pkcs1_example):
secret, public = pkcs1_example
private_num = rsa.RSAPrivateNumbers(
p=secret["p"],
q=secret["q"],
d=secret["private_exponent"],
dmp1=secret["dmp1"],
dmq1=secret["dmq1"],
iqmp=secret["iqmp"],
public_numbers=rsa.RSAPublicNumbers(
e=secret["public_exponent"], n=secret["modulus"]
),
)
_check_rsa_private_numbers(private_num)
public_num = rsa.RSAPublicNumbers(
e=public["public_exponent"], n=public["modulus"]
)
assert public_num
public_num2 = private_num.public_numbers
assert public_num2
assert public_num.n == public_num2.n
assert public_num.e == public_num2.e
@pytest.mark.supported(
only_if=lambda backend: (
not backend._lib.CRYPTOGRAPHY_IS_BORINGSSL
and (
not backend._lib.CRYPTOGRAPHY_OPENSSL_LESS_THAN_111E
or backend._lib.CRYPTOGRAPHY_IS_LIBRESSL
and not backend._lib.CRYPTOGRAPHY_LIBRESSL_LESS_THAN_380
)
),
skip_message="Does not support RSA PSS loading",
)
@pytest.mark.parametrize(
"path",
[
os.path.join("asymmetric", "PKCS8", "rsa_pss_2048.pem"),
os.path.join("asymmetric", "PKCS8", "rsa_pss_2048_hash.pem"),
os.path.join("asymmetric", "PKCS8", "rsa_pss_2048_hash_mask.pem"),
os.path.join(
"asymmetric", "PKCS8", "rsa_pss_2048_hash_mask_diff.pem"
),
os.path.join(
"asymmetric", "PKCS8", "rsa_pss_2048_hash_mask_salt.pem"
),
],
)
def test_load_pss_keys_strips_constraints(self, path, backend):
key = load_vectors_from_file(
filename=path,
loader=lambda p: serialization.load_pem_private_key(
p.read(), password=None, unsafe_skip_rsa_key_validation=True
),
mode="rb",
)
# These keys have constraints that prohibit PKCS1v15 signing,
# but for now we load them without the constraint and test that
# it's truly removed by performing a disallowed signature.
assert isinstance(key, rsa.RSAPrivateKey)
signature = key.sign(b"whatever", padding.PKCS1v15(), hashes.SHA224())
key.public_key().verify(
signature, b"whatever", padding.PKCS1v15(), hashes.SHA224()
)
def test_load_pss_pub_keys_strips_constraints(self, backend):
key = load_vectors_from_file(
filename=os.path.join(
"asymmetric", "PKCS8", "rsa_pss_2048_pub.der"
),
loader=lambda p: serialization.load_der_public_key(
p.read(),
),
mode="rb",
)
assert isinstance(key, rsa.RSAPublicKey)
with pytest.raises(InvalidSignature):
key.verify(
b"badsig", b"whatever", padding.PKCS1v15(), hashes.SHA256()
)
@pytest.mark.supported(
only_if=lambda backend: (
backend._lib.CRYPTOGRAPHY_IS_BORINGSSL
and (
not backend._lib.CRYPTOGRAPHY_OPENSSL_LESS_THAN_111E
or backend._lib.CRYPTOGRAPHY_IS_LIBRESSL
and not backend._lib.CRYPTOGRAPHY_LIBRESSL_LESS_THAN_380
)
),
skip_message="Test requires a backend without RSA-PSS key support",
)
def test_load_pss_unsupported(self, backend):
# Key loading errors unfortunately have multiple paths so
# we need to allow ValueError and UnsupportedAlgorithm
with pytest.raises((UnsupportedAlgorithm, ValueError)):
load_vectors_from_file(
filename=os.path.join(
"asymmetric", "PKCS8", "rsa_pss_2048.pem"
),
loader=lambda p: serialization.load_pem_private_key(
p.read(), password=None
),
mode="rb",
)
@pytest.mark.parametrize(
"vector",
load_vectors_from_file(
os.path.join("asymmetric", "RSA", "oaep-label.txt"),
load_nist_vectors,
),
)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=b"label",
)
),
skip_message="Does not support RSA OAEP labels",
)
def test_oaep_label_decrypt(self, vector, backend):
private_key = serialization.load_der_private_key(
binascii.unhexlify(vector["key"]),
None,
backend,
unsafe_skip_rsa_key_validation=True,
)
assert isinstance(private_key, rsa.RSAPrivateKey)
assert vector["oaepdigest"] == b"SHA512"
decrypted = private_key.decrypt(
binascii.unhexlify(vector["input"]),
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA512()),
algorithm=hashes.SHA512(),
label=binascii.unhexlify(vector["oaeplabel"]),
),
)
assert vector["output"][1:-1] == decrypted
@pytest.mark.parametrize(
("msg", "label"),
[
(b"amazing encrypted msg", b"some label"),
(b"amazing encrypted msg", b""),
],
)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=b"label",
)
),
skip_message="Does not support RSA OAEP labels",
)
def test_oaep_label_roundtrip(self, rsa_key_2048, msg, label, backend):
private_key = rsa_key_2048
ct = private_key.public_key().encrypt(
msg,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=label,
),
)
pt = private_key.decrypt(
ct,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=label,
),
)
assert pt == msg
@pytest.mark.parametrize(
("enclabel", "declabel"),
[(b"label1", b"label2"), (b"label3", b""), (b"", b"label4")],
)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=b"label",
)
),
skip_message="Does not support RSA OAEP labels",
)
def test_oaep_wrong_label(self, rsa_key_2048, enclabel, declabel, backend):
private_key = rsa_key_2048
msg = b"test"
ct = private_key.public_key().encrypt(
msg,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=enclabel,
),
)
with pytest.raises(ValueError):
private_key.decrypt(
ct,
padding.OAEP(
mgf=padding.MGF1(algorithm=hashes.SHA256()),
algorithm=hashes.SHA256(),
label=declabel,
),
)
class TestRSASignature:
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PKCS1v15()
),
skip_message="Does not support PKCS1v1.5.",
)
@pytest.mark.supported(
only_if=lambda backend: backend.signature_hash_supported(
hashes.SHA1()
),
skip_message="Does not support SHA1 signature.",
)
def test_pkcs1v15_signing(self, backend, subtests):
vectors = _flatten_pkcs1_examples(
load_vectors_from_file(
os.path.join("asymmetric", "RSA", "pkcs1v15sign-vectors.txt"),
load_pkcs1_vectors,
)
)
for private, public, example in vectors:
with subtests.test():
private_key = rsa.RSAPrivateNumbers(
p=private["p"],
q=private["q"],
d=private["private_exponent"],
dmp1=private["dmp1"],
dmq1=private["dmq1"],
iqmp=private["iqmp"],
public_numbers=rsa.RSAPublicNumbers(
e=private["public_exponent"], n=private["modulus"]
),
).private_key(backend, unsafe_skip_rsa_key_validation=True)
signature = private_key.sign(
binascii.unhexlify(example["message"]),
padding.PKCS1v15(),
hashes.SHA1(),
)
assert binascii.hexlify(signature) == example["signature"]
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PSS(
mgf=padding.MGF1(hashes.SHA1()),
salt_length=padding.PSS.MAX_LENGTH,
)
),
skip_message="Does not support PSS.",
)
@pytest.mark.supported(
only_if=lambda backend: backend.signature_hash_supported(
hashes.SHA1()
),
skip_message="Does not support SHA1 signature.",
)
def test_pss_signing(self, subtests, backend):
for private, public, example in _flatten_pkcs1_examples(
load_vectors_from_file(
os.path.join(
"asymmetric", "RSA", "pkcs-1v2-1d2-vec", "pss-vect.txt"
),
load_pkcs1_vectors,
)
):
with subtests.test():
private_key = rsa.RSAPrivateNumbers(
p=private["p"],
q=private["q"],
d=private["private_exponent"],
dmp1=private["dmp1"],
dmq1=private["dmq1"],
iqmp=private["iqmp"],
public_numbers=rsa.RSAPublicNumbers(
e=private["public_exponent"], n=private["modulus"]
),
).private_key(backend, unsafe_skip_rsa_key_validation=True)
public_key = rsa.RSAPublicNumbers(
e=public["public_exponent"], n=public["modulus"]
).public_key(backend)
signature = private_key.sign(
binascii.unhexlify(example["message"]),
padding.PSS(
mgf=padding.MGF1(algorithm=hashes.SHA1()),
salt_length=padding.PSS.MAX_LENGTH,
),
hashes.SHA1(),
)
assert len(signature) == (private_key.key_size + 7) // 8
# PSS signatures contain randomness so we can't do an exact
# signature check. Instead we'll verify that the signature
# created successfully verifies.
public_key.verify(
signature,
binascii.unhexlify(example["message"]),
padding.PSS(
mgf=padding.MGF1(algorithm=hashes.SHA1()),
salt_length=padding.PSS.MAX_LENGTH,
),
hashes.SHA1(),
)
@pytest.mark.parametrize(
"hash_alg",
[hashes.SHA224(), hashes.SHA256(), hashes.SHA384(), hashes.SHA512()],
)
def test_pss_signing_sha2(self, rsa_key_2048, hash_alg, backend):
_skip_pss_hash_algorithm_unsupported(backend, hash_alg)
private_key = rsa_key_2048
public_key = private_key.public_key()
pss = padding.PSS(
mgf=padding.MGF1(hash_alg), salt_length=padding.PSS.MAX_LENGTH
)
msg = b"testing signature"
signature = private_key.sign(msg, pss, hash_alg)
public_key.verify(signature, msg, pss, hash_alg)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.DIGEST_LENGTH,
)
),
skip_message="Does not support PSS.",
)
def test_pss_digest_length(self, rsa_key_2048, backend):
private_key = rsa_key_2048
signature = private_key.sign(
b"some data",
padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.DIGEST_LENGTH,
),
hashes.SHA256(),
)
public = private_key.public_key()
public.verify(
signature,
b"some data",
padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.DIGEST_LENGTH,
),
hashes.SHA256(),
)
public.verify(
signature,
b"some data",
padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=32,
),
hashes.SHA256(),
)
@pytest.mark.supported(
only_if=lambda backend: (
backend.hash_supported(hashes.SHA512())
and backend.rsa_padding_supported(
padding.PSS(
mgf=padding.MGF1(hashes.SHA1()),
salt_length=padding.PSS.MAX_LENGTH,
)
)
),
skip_message="Does not support SHA512.",
)
@pytest.mark.skip_fips(reason="Unsupported key size in FIPS mode.")
def test_pss_minimum_key_size_for_digest(self, backend):
private_key = RSA_KEY_522.private_key(
backend, unsafe_skip_rsa_key_validation=True
)
private_key.sign(
b"no failure",
padding.PSS(
mgf=padding.MGF1(hashes.SHA1()),
salt_length=padding.PSS.MAX_LENGTH,
),
hashes.SHA512(),
)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PSS(
mgf=padding.MGF1(hashes.SHA1()),
salt_length=padding.PSS.MAX_LENGTH,
)
),
skip_message="Does not support PSS.",
)
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(hashes.SHA512()),
skip_message="Does not support SHA512.",
)
@pytest.mark.skip_fips(reason="Unsupported key size in FIPS mode.")
def test_pss_signing_digest_too_large_for_key_size(
self, rsa_key_512: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_512
with pytest.raises(ValueError):
private_key.sign(
b"msg",
padding.PSS(
mgf=padding.MGF1(hashes.SHA1()),
salt_length=padding.PSS.MAX_LENGTH,
),
hashes.SHA512(),
)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PSS(
mgf=padding.MGF1(hashes.SHA1()),
salt_length=padding.PSS.MAX_LENGTH,
)
),
skip_message="Does not support PSS.",
)
def test_pss_signing_salt_length_too_long(
self, rsa_key_2048: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_2048
with pytest.raises(ValueError):
private_key.sign(
b"failure coming",
padding.PSS(
mgf=padding.MGF1(hashes.SHA1()), salt_length=1000000
),
hashes.SHA256(),
)
def test_unsupported_padding(
self, rsa_key_2048: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_2048
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_PADDING):
private_key.sign(b"msg", DummyAsymmetricPadding(), hashes.SHA1())
def test_padding_incorrect_type(
self, rsa_key_2048: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_2048
with pytest.raises(TypeError):
private_key.sign(
b"msg",
"notpadding", # type: ignore[arg-type]
hashes.SHA256(),
)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PSS(mgf=padding.MGF1(hashes.SHA1()), salt_length=0)
),
skip_message="Does not support PSS.",
)
def test_unsupported_pss_mgf(
self, rsa_key_2048: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_2048
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_MGF):
private_key.sign(
b"msg",
padding.PSS(
mgf=DummyMGF(),
salt_length=padding.PSS.MAX_LENGTH,
),
hashes.SHA1(),
)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.AUTO,
)
),
skip_message="Does not support PSS.",
)
def test_pss_sign_unsupported_auto(
self, rsa_key_2048: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_2048
with pytest.raises(ValueError):
private_key.sign(
b"some data",
padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.AUTO,
),
hashes.SHA256(),
)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PKCS1v15()
),
skip_message="Does not support PKCS1v1.5.",
)
@pytest.mark.skip_fips(reason="Unsupported key size in FIPS mode.")
def test_pkcs1_digest_too_large_for_key_size(self, backend):
private_key = RSA_KEY_599.private_key(
backend, unsafe_skip_rsa_key_validation=True
)
with pytest.raises(ValueError):
private_key.sign(
b"failure coming", padding.PKCS1v15(), hashes.SHA512()
)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PKCS1v15()
),
skip_message="Does not support PKCS1v1.5.",
)
@pytest.mark.skip_fips(reason="Unsupported key size in FIPS mode.")
def test_pkcs1_minimum_key_size(self, backend):
private_key = RSA_KEY_745.private_key(
backend, unsafe_skip_rsa_key_validation=True
)
private_key.sign(b"no failure", padding.PKCS1v15(), hashes.SHA512())
@pytest.mark.parametrize(
"message",
[
b"one little message",
bytearray(b"one little message"),
],
)
def test_sign(self, rsa_key_2048: rsa.RSAPrivateKey, message, backend):
private_key = rsa_key_2048
pkcs = padding.PKCS1v15()
algorithm = hashes.SHA256()
signature = private_key.sign(message, pkcs, algorithm)
public_key = private_key.public_key()
public_key.verify(signature, message, pkcs, algorithm)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PSS(mgf=padding.MGF1(hashes.SHA1()), salt_length=0)
),
skip_message="Does not support PSS.",
)
def test_prehashed_sign(self, rsa_key_2048: rsa.RSAPrivateKey, backend):
private_key = rsa_key_2048
message = b"one little message"
h = hashes.Hash(hashes.SHA256(), backend)
h.update(message)
digest = h.finalize()
pss = padding.PSS(mgf=padding.MGF1(hashes.SHA1()), salt_length=0)
prehashed_alg = asym_utils.Prehashed(hashes.SHA256())
signature = private_key.sign(digest, pss, prehashed_alg)
public_key = private_key.public_key()
public_key.verify(signature, message, pss, hashes.SHA256())
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.DIGEST_LENGTH,
)
),
skip_message="Does not support PSS.",
)
def test_prehashed_digest_length(
self, rsa_key_2048: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_2048
message = b"one little message"
h = hashes.Hash(hashes.SHA256(), backend)
h.update(message)
digest = h.finalize()
pss = padding.PSS(
mgf=padding.MGF1(hashes.SHA256()),
salt_length=padding.PSS.DIGEST_LENGTH,
)
prehashed_alg = asym_utils.Prehashed(hashes.SHA256())
signature = private_key.sign(digest, pss, prehashed_alg)
public_key = private_key.public_key()
public_key.verify(signature, message, pss, hashes.SHA256())
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(
hashes.BLAKE2s(digest_size=32)
),
skip_message="Does not support BLAKE2s",
)
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PSS(mgf=padding.MGF1(hashes.SHA1()), salt_length=0)
),
skip_message="Does not support PSS.",
)
def test_unsupported_hash(self, rsa_key_512: rsa.RSAPrivateKey, backend):
private_key = rsa_key_512
message = b"one little message"
pss = padding.PSS(mgf=padding.MGF1(hashes.SHA256()), salt_length=0)
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
private_key.sign(message, pss, hashes.BLAKE2s(32))
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PSS(mgf=padding.MGF1(hashes.SHA256()), salt_length=0)
),
skip_message="Does not support PSS.",
)
def test_unsupported_hash_pss_mgf1(self, rsa_key_2048: rsa.RSAPrivateKey):
private_key = rsa_key_2048
message = b"my message"
pss = padding.PSS(
mgf=padding.MGF1(DummyHashAlgorithm()), salt_length=0
)
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
private_key.sign(message, pss, hashes.SHA256())
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PSS(mgf=padding.MGF1(hashes.SHA1()), salt_length=0)
),
skip_message="Does not support PSS.",
)
def test_prehashed_digest_mismatch(
self, rsa_key_512: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_512
message = b"one little message"
h = hashes.Hash(hashes.SHA512(), backend)
h.update(message)
digest = h.finalize()
pss = padding.PSS(mgf=padding.MGF1(hashes.SHA1()), salt_length=0)
prehashed_alg = asym_utils.Prehashed(hashes.SHA1())
with pytest.raises(ValueError):
private_key.sign(digest, pss, prehashed_alg)
def test_prehashed_unsupported_in_signature_recover(
self, rsa_key_2048: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_2048
public_key = private_key.public_key()
signature = private_key.sign(
b"sign me", padding.PKCS1v15(), hashes.SHA256()
)
prehashed_alg = asym_utils.Prehashed(hashes.SHA256())
with pytest.raises(TypeError):
public_key.recover_data_from_signature(
signature,
padding.PKCS1v15(),
prehashed_alg, # type: ignore[arg-type]
)
def test_corrupted_private_key(self, backend):
with pytest.raises(ValueError):
serialization.load_pem_private_key(
RSA_KEY_CORRUPTED, password=None, backend=backend
)
class TestRSAVerification:
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PKCS1v15()
),
skip_message="Does not support PKCS1v1.5.",
)
@pytest.mark.supported(
only_if=lambda backend: backend.signature_hash_supported(
hashes.SHA1()
),
skip_message="Does not support SHA1 signature.",
)
def test_pkcs1v15_verification(self, backend, subtests):
vectors = _flatten_pkcs1_examples(
load_vectors_from_file(
os.path.join("asymmetric", "RSA", "pkcs1v15sign-vectors.txt"),
load_pkcs1_vectors,
)
)
for private, public, example in vectors:
with subtests.test():
public_key = rsa.RSAPublicNumbers(
e=public["public_exponent"], n=public["modulus"]
).public_key(backend)
signature = binascii.unhexlify(example["signature"])
message = binascii.unhexlify(example["message"])
public_key.verify(
signature, message, padding.PKCS1v15(), hashes.SHA1()
)
# Test digest recovery by providing hash
digest = hashes.Hash(hashes.SHA1())
digest.update(message)
msg_digest = digest.finalize()
rec_msg_digest = public_key.recover_data_from_signature(
signature, padding.PKCS1v15(), hashes.SHA1()
)
assert msg_digest == rec_msg_digest
# Test recovery of all data (full DigestInfo) with hash alg. as
# None
rec_sig_data = public_key.recover_data_from_signature(
signature, padding.PKCS1v15(), None
)
assert len(rec_sig_data) > len(msg_digest)
assert msg_digest == rec_sig_data[-len(msg_digest) :]
@pytest.mark.supported(
only_if=lambda backend: backend.rsa_padding_supported(
padding.PKCS1v15()
),
skip_message="Does not support PKCS1v1.5.",
)
def test_invalid_pkcs1v15_signature_wrong_data(
self, rsa_key_2048: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_2048
public_key = private_key.public_key()
signature = private_key.sign(
b"sign me", padding.PKCS1v15(), hashes.SHA256()
)
with pytest.raises(InvalidSignature):
public_key.verify(
signature,
b"incorrect data",
padding.PKCS1v15(),
hashes.SHA256(),
)
def test_invalid_pkcs1v15_signature_recover_wrong_hash_alg(
self, rsa_key_2048: rsa.RSAPrivateKey, backend
):
private_key = rsa_key_2048
public_key = private_key.public_key()
signature = private_key.sign(
b"sign me", padding.PKCS1v15(), hashes.SHA256()
)
with pytest.raises(InvalidSignature):
public_key.recover_data_from_signature(
signature, padding.PKCS1v15(), hashes.SHA512()
)
def test_invalid_signature_sequence_removed(self, backend):
"""
This test comes from wycheproof
"""
key_der = binascii.unhexlify(
b"30820122300d06092a864886f70d01010105000382010f003082010a02820101"
b"00a2b451a07d0aa5f96e455671513550514a8a5b462ebef717094fa1fee82224"
b"e637f9746d3f7cafd31878d80325b6ef5a1700f65903b469429e89d6eac88450"
b"97b5ab393189db92512ed8a7711a1253facd20f79c15e8247f3d3e42e46e48c9"
b"8e254a2fe9765313a03eff8f17e1a029397a1fa26a8dce26f490ed81299615d9"
b"814c22da610428e09c7d9658594266f5c021d0fceca08d945a12be82de4d1ece"
b"6b4c03145b5d3495d4ed5411eb878daf05fd7afc3e09ada0f1126422f590975a"
b"1969816f48698bcbba1b4d9cae79d460d8f9f85e7975005d9bc22c4e5ac0f7c1"
b"a45d12569a62807d3b9a02e5a530e773066f453d1f5b4c2e9cf7820283f742b9"
b"d50203010001"
)
sig = binascii.unhexlify(