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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 pytest
from cryptography.exceptions import InternalError, _Reasons
from cryptography.hazmat.backends import _available_backends
from cryptography.hazmat.primitives.ciphers import Cipher
from cryptography.hazmat.primitives.ciphers.algorithms import AES
from cryptography.hazmat.primitives.ciphers.modes import CBC, GCM
from ...doubles import DummyCipherAlgorithm
from ...utils import raises_unsupported_algorithm
@pytest.mark.skipif("commoncrypto" not in
[i.name for i in _available_backends()],
reason="CommonCrypto not available")
class TestCommonCrypto(object):
def test_supports_cipher(self):
from cryptography.hazmat.backends.commoncrypto.backend import backend
assert backend.cipher_supported(None, None) is False
def test_register_duplicate_cipher_adapter(self):
from cryptography.hazmat.backends.commoncrypto.backend import backend
with pytest.raises(ValueError):
backend._register_cipher_adapter(
AES, backend._lib.kCCAlgorithmAES128,
CBC, backend._lib.kCCModeCBC
)
def test_handle_response(self):
from cryptography.hazmat.backends.commoncrypto.backend import backend
with pytest.raises(ValueError):
backend._check_cipher_response(backend._lib.kCCAlignmentError)
with pytest.raises(InternalError):
backend._check_cipher_response(backend._lib.kCCMemoryFailure)
with pytest.raises(InternalError):
backend._check_cipher_response(backend._lib.kCCDecodeError)
def test_nonexistent_aead_cipher(self):
from cryptography.hazmat.backends.commoncrypto.backend import Backend
b = Backend()
cipher = Cipher(
DummyCipherAlgorithm(), GCM(b"fake_iv_here"), backend=b,
)
with raises_unsupported_algorithm(_Reasons.UNSUPPORTED_CIPHER):
cipher.encryptor()
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