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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.
from __future__ import absolute_import, division, print_function
import binascii
import pytest
from cryptography.exceptions import AlreadyFinalized, _Reasons
from cryptography.hazmat.backends.interfaces import HashBackend
from cryptography.hazmat.primitives import hashes
from .utils import generate_base_hash_test
from ...doubles import DummyHashAlgorithm
from ...utils import raises_unsupported_algorithm
@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(u"\u00FC")
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(DummyHashAlgorithm(), 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,
)
@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,
)
@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,
)
@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,
)
@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,
)
@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,
)
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(
hashes.BLAKE2b(digest_size=64)),
skip_message="Does not support BLAKE2b",
)
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestBLAKE2b(object):
test_BLAKE2b = generate_base_hash_test(
hashes.BLAKE2b(digest_size=64),
digest_size=64,
)
def test_invalid_digest_size(self, backend):
with pytest.raises(ValueError):
hashes.BLAKE2b(digest_size=65)
with pytest.raises(ValueError):
hashes.BLAKE2b(digest_size=0)
with pytest.raises(ValueError):
hashes.BLAKE2b(digest_size=-1)
@pytest.mark.supported(
only_if=lambda backend: backend.hash_supported(
hashes.BLAKE2s(digest_size=32)),
skip_message="Does not support BLAKE2s",
)
@pytest.mark.requires_backend_interface(interface=HashBackend)
class TestBLAKE2s(object):
test_BLAKE2s = generate_base_hash_test(
hashes.BLAKE2s(digest_size=32),
digest_size=32,
)
def test_invalid_digest_size(self, backend):
with pytest.raises(ValueError):
hashes.BLAKE2s(digest_size=33)
with pytest.raises(ValueError):
hashes.BLAKE2s(digest_size=0)
with pytest.raises(ValueError):
hashes.BLAKE2s(digest_size=-1)
def test_invalid_backend():
pretend_backend = object()
with raises_unsupported_algorithm(_Reasons.BACKEND_MISSING_INTERFACE):
hashes.Hash(hashes.SHA1(), pretend_backend)
@pytest.mark.requires_backend_interface(interface=HashBackend)
def test_buffer_protocol_hash(backend):
data = binascii.unhexlify(b"b4190e")
h = hashes.Hash(hashes.SHA256(), backend)
h.update(bytearray(data))
assert h.finalize() == binascii.unhexlify(
b"dff2e73091f6c05e528896c4c831b9448653dc2ff043528f6769437bc7b975c2"
)
class TestSHAKE(object):
@pytest.mark.parametrize(
"xof",
[hashes.SHAKE128, hashes.SHAKE256]
)
def test_invalid_digest_type(self, xof):
with pytest.raises(TypeError):
xof(digest_size=object())
@pytest.mark.parametrize(
"xof",
[hashes.SHAKE128, hashes.SHAKE256]
)
def test_invalid_digest_size(self, xof):
with pytest.raises(ValueError):
xof(digest_size=-5)
with pytest.raises(ValueError):
xof(digest_size=0)
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