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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, InvalidSignature, _Reasons
)
from cryptography.hazmat.backends.interfaces import HMACBackend
from cryptography.hazmat.primitives import hashes, hmac
from .utils import generate_base_hmac_test
from ...doubles import DummyHashAlgorithm
from ...utils import raises_unsupported_algorithm
@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(u"\u00FC")
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(u'')
def test_unsupported_hash(self, backend):
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_HASH):
hmac.HMAC(b"key", DummyHashAlgorithm(), backend)
def test_buffer_protocol(self, backend):
key = bytearray(b"2b7e151628aed2a6abf7158809cf4f3c")
h = hmac.HMAC(key, hashes.SHA256(), backend)
h.update(bytearray(b"6bc1bee22e409f96e93d7e117393172a"))
assert h.finalize() == binascii.unhexlify(
b"a1bf7169c56a501c6585190ff4f07cad6e492a3ee187c0372614fb444b9fc3f0"
)
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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