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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 pretend
import pytest
import six
from cryptography import utils
from cryptography.exceptions import (
AlreadyFinalized, InvalidSignature, _Reasons
)
from cryptography.hazmat.backends.interfaces import HMACBackend
from cryptography.hazmat.primitives import hashes, hmac, interfaces
from .utils import generate_base_hmac_test
from ..backends.test_multibackend import DummyHMACBackend
from ...utils import raises_unsupported_algorithm
@utils.register_interface(interfaces.HashAlgorithm)
class UnsupportedDummyHash(object):
name = "unsupported-dummy-hash"
block_size = None
digest_size = None
@pytest.mark.supported(
only_if=lambda backend: backend.hmac_supported(hashes.MD5()),
skip_message="Does not support MD5",
)
@pytest.mark.requires_backend_interface(interface=HMACBackend)
class TestHMACCopy(object):
test_copy = generate_base_hmac_test(
hashes.MD5(),
)
@pytest.mark.requires_backend_interface(interface=HMACBackend)
class TestHMAC(object):
def test_hmac_reject_unicode(self, backend):
h = hmac.HMAC(b"mykey", hashes.SHA1(), backend=backend)
with pytest.raises(TypeError):
h.update(six.u("\u00FC"))
def test_copy_backend_object(self):
backend = DummyHMACBackend([hashes.SHA1])
copied_ctx = pretend.stub()
pretend_ctx = pretend.stub(copy=lambda: copied_ctx)
h = hmac.HMAC(b"key", hashes.SHA1(), backend=backend, ctx=pretend_ctx)
assert h._backend is backend
assert h.copy()._backend is backend
def test_hmac_algorithm_instance(self, backend):
with pytest.raises(TypeError):
hmac.HMAC(b"key", hashes.SHA1, backend=backend)
def test_raises_after_finalize(self, backend):
h = hmac.HMAC(b"key", hashes.SHA1(), backend=backend)
h.finalize()
with pytest.raises(AlreadyFinalized):
h.update(b"foo")
with pytest.raises(AlreadyFinalized):
h.copy()
with pytest.raises(AlreadyFinalized):
h.finalize()
def test_verify(self, backend):
h = hmac.HMAC(b'', hashes.SHA1(), backend=backend)
digest = h.finalize()
h = hmac.HMAC(b'', hashes.SHA1(), backend=backend)
h.verify(digest)
with pytest.raises(AlreadyFinalized):
h.verify(b'')
def test_invalid_verify(self, backend):
h = hmac.HMAC(b'', hashes.SHA1(), backend=backend)
with pytest.raises(InvalidSignature):
h.verify(b'')
with pytest.raises(AlreadyFinalized):
h.verify(b'')
def test_verify_reject_unicode(self, backend):
h = hmac.HMAC(b'', hashes.SHA1(), backend=backend)
with pytest.raises(TypeError):
h.verify(six.u(''))
def test_unsupported_hash(self, backend):
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
hmac.HMAC(b"key", UnsupportedDummyHash(), backend)
def test_invalid_backend():
pretend_backend = object()
with raises_unsupported_algorithm(_Reasons.BACKEND_MISSING_INTERFACE):
hmac.HMAC(b"key", hashes.SHA1(), pretend_backend)
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