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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.hazmat.primitives import hashes, hmac
from .utils import generate_base_hmac_test
class TestHMAC(object):
test_copy = generate_base_hmac_test(
hashes.MD5(),
only_if=lambda backend: backend.hash_supported(hashes.MD5),
skip_message="Does not support MD5",
)
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):
pretend_hmac = pretend.stub()
pretend_backend = pretend.stub(hmacs=pretend_hmac)
copied_ctx = pretend.stub()
pretend_ctx = pretend.stub(copy=lambda: copied_ctx)
h = hmac.HMAC(b"key", hashes.SHA1(), backend=pretend_backend,
ctx=pretend_ctx)
assert h._backend is pretend_backend
assert h.copy()._backend is pretend_backend
def test_hmac_algorithm_instance(self):
with pytest.raises(TypeError):
hmac.HMAC(b"key", hashes.SHA1)
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