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|
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from __future__ import absolute_import, division, print_function
import itertools
import os
import pytest
from cryptography import exceptions, utils
from cryptography.hazmat.backends.interfaces import EllipticCurveBackend
from cryptography.hazmat.primitives import hashes, interfaces
from cryptography.hazmat.primitives.asymmetric import ec
from ...utils import (
der_encode_dsa_signature, load_fips_ecdsa_key_pair_vectors,
load_fips_ecdsa_signing_vectors, load_vectors_from_file,
raises_unsupported_algorithm
)
_HASH_TYPES = {
"SHA-1": hashes.SHA1,
"SHA-224": hashes.SHA224,
"SHA-256": hashes.SHA256,
"SHA-384": hashes.SHA384,
"SHA-512": hashes.SHA512,
}
def _skip_ecdsa_vector(backend, curve_type, hash_type):
if not backend.elliptic_curve_signature_algorithm_supported(
ec.ECDSA(hash_type()),
curve_type()
):
pytest.skip(
"ECDSA not supported with this hash {0} and curve {1}".format(
hash_type().name, curve_type().name
)
)
def _skip_curve_unsupported(backend, curve):
if not backend.elliptic_curve_supported(curve):
pytest.skip(
"Curve {0} is not supported by this backend {1}".format(
curve.name, backend
)
)
@utils.register_interface(interfaces.EllipticCurve)
class DummyCurve(object):
name = "dummy-curve"
key_size = 1
@utils.register_interface(interfaces.EllipticCurveSignatureAlgorithm)
class DummySignatureAlgorithm(object):
pass
@utils.register_interface(EllipticCurveBackend)
class DeprecatedDummyECBackend(object):
def elliptic_curve_private_key_from_numbers(self, numbers):
return b"private_key"
def elliptic_curve_public_key_from_numbers(self, numbers):
return b"public_key"
@pytest.mark.elliptic
def test_skip_curve_unsupported(backend):
with pytest.raises(pytest.skip.Exception):
_skip_curve_unsupported(backend, DummyCurve())
def test_ec_numbers():
numbers = ec.EllipticCurvePrivateNumbers(
1,
ec.EllipticCurvePublicNumbers(
2, 3, DummyCurve()
)
)
assert numbers.private_value == 1
assert numbers.public_numbers.x == 2
assert numbers.public_numbers.y == 3
assert isinstance(numbers.public_numbers.curve, DummyCurve)
with pytest.raises(TypeError):
ec.EllipticCurvePrivateNumbers(
None,
ec.EllipticCurvePublicNumbers(
2, 3, DummyCurve()
)
)
with pytest.raises(TypeError):
ec.EllipticCurvePrivateNumbers(
1,
ec.EllipticCurvePublicNumbers(
None, 3, DummyCurve()
)
)
with pytest.raises(TypeError):
ec.EllipticCurvePrivateNumbers(
1,
ec.EllipticCurvePublicNumbers(
2, None, DummyCurve()
)
)
with pytest.raises(TypeError):
ec.EllipticCurvePrivateNumbers(
1,
ec.EllipticCurvePublicNumbers(
2, 3, None
)
)
with pytest.raises(TypeError):
ec.EllipticCurvePrivateNumbers(
1,
None
)
@pytest.mark.elliptic
class TestECWithNumbers(object):
@pytest.mark.parametrize(
("vector", "hash_type"),
list(itertools.product(
load_vectors_from_file(
os.path.join(
"asymmetric", "ECDSA", "FIPS_186-3", "KeyPair.rsp"),
load_fips_ecdsa_key_pair_vectors
),
_HASH_TYPES.values()
))
)
def test_with_numbers(self, backend, vector, hash_type):
curve_type = ec._CURVE_TYPES[vector['curve']]
_skip_ecdsa_vector(backend, curve_type, hash_type)
key = ec.EllipticCurvePrivateNumbers(
vector['d'],
ec.EllipticCurvePublicNumbers(
vector['x'],
vector['y'],
curve_type()
)
).private_key(backend)
assert key
if isinstance(key, interfaces.EllipticCurvePrivateKeyWithNumbers):
priv_num = key.private_numbers()
assert priv_num.private_value == vector['d']
assert priv_num.public_numbers.x == vector['x']
assert priv_num.public_numbers.y == vector['y']
assert curve_type().name == priv_num.public_numbers.curve.name
@pytest.mark.elliptic
class TestECDSAVectors(object):
@pytest.mark.parametrize(
("vector", "hash_type"),
list(itertools.product(
load_vectors_from_file(
os.path.join(
"asymmetric", "ECDSA", "FIPS_186-3", "KeyPair.rsp"),
load_fips_ecdsa_key_pair_vectors
),
_HASH_TYPES.values()
))
)
def test_signing_with_example_keys(self, backend, vector, hash_type):
curve_type = ec._CURVE_TYPES[vector['curve']]
_skip_ecdsa_vector(backend, curve_type, hash_type)
key = ec.EllipticCurvePrivateNumbers(
vector['d'],
ec.EllipticCurvePublicNumbers(
vector['x'],
vector['y'],
curve_type()
)
).private_key(backend)
assert key
pkey = key.public_key()
assert pkey
signer = key.signer(ec.ECDSA(hash_type()))
signer.update(b"YELLOW SUBMARINE")
signature = signer.finalize()
verifier = pkey.verifier(signature, ec.ECDSA(hash_type()))
verifier.update(b"YELLOW SUBMARINE")
verifier.verify()
@pytest.mark.parametrize(
"curve", ec._CURVE_TYPES.values()
)
def test_generate_vector_curves(self, backend, curve):
_skip_curve_unsupported(backend, curve())
key = ec.generate_private_key(curve(), backend)
assert key
assert isinstance(key.curve, curve)
assert key.curve.key_size
pkey = key.public_key()
assert pkey
assert isinstance(pkey.curve, curve)
assert key.curve.key_size == pkey.curve.key_size
def test_generate_unknown_curve(self, backend):
with raises_unsupported_algorithm(
exceptions._Reasons.UNSUPPORTED_ELLIPTIC_CURVE
):
ec.generate_private_key(DummyCurve(), backend)
assert backend.elliptic_curve_signature_algorithm_supported(
ec.ECDSA(hashes.SHA256()),
DummyCurve()
) is False
def test_unknown_signature_algoritm(self, backend):
_skip_curve_unsupported(backend, ec.SECP192R1())
key = ec.generate_private_key(ec.SECP192R1(), backend)
with raises_unsupported_algorithm(
exceptions._Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM
):
key.signer(DummySignatureAlgorithm())
with raises_unsupported_algorithm(
exceptions._Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM
):
key.public_key().verifier(b"", DummySignatureAlgorithm())
assert backend.elliptic_curve_signature_algorithm_supported(
DummySignatureAlgorithm(),
ec.SECP192R1()
) is False
@pytest.mark.parametrize(
"vector",
load_vectors_from_file(
os.path.join(
"asymmetric", "ECDSA", "FIPS_186-3", "SigGen.txt"),
load_fips_ecdsa_signing_vectors
)
)
def test_signatures(self, backend, vector):
hash_type = _HASH_TYPES[vector['digest_algorithm']]
curve_type = ec._CURVE_TYPES[vector['curve']]
_skip_ecdsa_vector(backend, curve_type, hash_type)
key = ec.EllipticCurvePublicNumbers(
vector['x'],
vector['y'],
curve_type()
).public_key(backend)
signature = der_encode_dsa_signature(
vector['r'],
vector['s']
)
verifier = key.verifier(
signature,
ec.ECDSA(hash_type())
)
verifier.update(vector['message'])
assert verifier.verify()
@pytest.mark.parametrize(
"vector",
load_vectors_from_file(
os.path.join(
"asymmetric", "ECDSA", "FIPS_186-3", "SigVer.rsp"),
load_fips_ecdsa_signing_vectors
)
)
def test_signature_failures(self, backend, vector):
hash_type = _HASH_TYPES[vector['digest_algorithm']]
curve_type = ec._CURVE_TYPES[vector['curve']]
_skip_ecdsa_vector(backend, curve_type, hash_type)
key = ec.EllipticCurvePublicNumbers(
vector['x'],
vector['y'],
curve_type()
).public_key(backend)
signature = der_encode_dsa_signature(
vector['r'],
vector['s']
)
verifier = key.verifier(
signature,
ec.ECDSA(hash_type())
)
verifier.update(vector['message'])
if vector["fail"] is True:
with pytest.raises(exceptions.InvalidSignature):
verifier.verify()
else:
verifier.verify()
def test_deprecated_public_private_key_load(self):
b = DeprecatedDummyECBackend()
pub_numbers = ec.EllipticCurvePublicNumbers(
2,
3,
ec.SECT283K1()
)
numbers = ec.EllipticCurvePrivateNumbers(1, pub_numbers)
assert numbers.private_key(b) == b"private_key"
assert pub_numbers.public_key(b) == b"public_key"
|
