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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, _Reasons
)
from cryptography.hazmat.backends.interfaces import HashBackend
from cryptography.hazmat.primitives import hashes, interfaces
from .utils import generate_base_hash_test
from ...utils import raises_unsupported_algorithm
@utils.register_interface(interfaces.HashAlgorithm)
class UnsupportedDummyHash(object):
name = "unsupported-dummy-hash"
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestHashContext(object):
def test_hash_reject_unicode(self, backend):
m = hashes.Hash(hashes.SHA1(), backend=backend)
with pytest.raises(TypeError):
m.update(six.u("\u00FC"))
def test_copy_backend_object(self):
@utils.register_interface(HashBackend)
class PretendBackend(object):
pass
pretend_backend = PretendBackend()
copied_ctx = pretend.stub()
pretend_ctx = pretend.stub(copy=lambda: copied_ctx)
h = hashes.Hash(hashes.SHA1(), backend=pretend_backend,
ctx=pretend_ctx)
assert h._backend is pretend_backend
assert h.copy()._backend is h._backend
def test_hash_algorithm_instance(self, backend):
with pytest.raises(TypeError):
hashes.Hash(hashes.SHA1, backend=backend)
def test_raises_after_finalize(self, backend):
h = hashes.Hash(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_unsupported_hash(self, backend):
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
hashes.Hash(UnsupportedDummyHash(), backend)
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(hashes.SHA1()),
skip_message="Does not support SHA1",
)
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestSHA1(object):
test_SHA1 = generate_base_hash_test(
hashes.SHA1(),
digest_size=20,
block_size=64,
)
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(hashes.SHA224()),
skip_message="Does not support SHA224",
)
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestSHA224(object):
test_SHA224 = generate_base_hash_test(
hashes.SHA224(),
digest_size=28,
block_size=64,
)
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(hashes.SHA256()),
skip_message="Does not support SHA256",
)
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestSHA256(object):
test_SHA256 = generate_base_hash_test(
hashes.SHA256(),
digest_size=32,
block_size=64,
)
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(hashes.SHA384()),
skip_message="Does not support SHA384",
)
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestSHA384(object):
test_SHA384 = generate_base_hash_test(
hashes.SHA384(),
digest_size=48,
block_size=128,
)
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(hashes.SHA512()),
skip_message="Does not support SHA512",
)
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestSHA512(object):
test_SHA512 = generate_base_hash_test(
hashes.SHA512(),
digest_size=64,
block_size=128,
)
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(hashes.RIPEMD160()),
skip_message="Does not support RIPEMD160",
)
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestRIPEMD160(object):
test_RIPEMD160 = generate_base_hash_test(
hashes.RIPEMD160(),
digest_size=20,
block_size=64,
)
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(hashes.Whirlpool()),
skip_message="Does not support Whirlpool",
)
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestWhirlpool(object):
test_Whirlpool = generate_base_hash_test(
hashes.Whirlpool(),
digest_size=64,
block_size=64,
)
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(hashes.MD5()),
skip_message="Does not support MD5",
)
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestMD5(object):
test_MD5 = generate_base_hash_test(
hashes.MD5(),
digest_size=16,
block_size=64,
)
def test_invalid_backend():
pretend_backend = object()
with raises_unsupported_algorithm(_Reasons.BACKEND_MISSING_INTERFACE):
hashes.Hash(hashes.SHA1(), pretend_backend)
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