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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.
import pytest
from cryptography import utils
from cryptography.exceptions import UnsupportedAlgorithm
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.backends.openssl.backend import backend, Backend
from cryptography.hazmat.primitives import interfaces
from cryptography.hazmat.primitives.ciphers import Cipher
from cryptography.hazmat.primitives.ciphers.algorithms import AES
from cryptography.hazmat.primitives.ciphers.modes import CBC
class DummyMode(object):
pass
@utils.register_interface(interfaces.CipherAlgorithm)
class DummyCipher(object):
pass
class TestOpenSSL(object):
def test_backend_exists(self):
assert backend
def test_is_default(self):
assert backend == default_backend()
def test_openssl_version_text(self):
"""
This test checks the value of OPENSSL_VERSION_TEXT.
Unfortunately, this define does not appear to have a
formal content definition, so for now we'll test to see
if it starts with OpenSSL as that appears to be true
for every OpenSSL.
"""
assert backend.openssl_version_text().startswith("OpenSSL")
def test_supports_cipher(self):
assert backend.cipher_supported(None, None) is False
def test_register_duplicate_cipher_adapter(self):
with pytest.raises(ValueError):
backend.register_cipher_adapter(AES, CBC, None)
def test_instances_share_ffi(self):
b = Backend()
assert b.ffi is backend.ffi
assert b.lib is backend.lib
def test_nonexistent_cipher(self):
b = Backend()
b.register_cipher_adapter(
DummyCipher,
DummyMode,
lambda backend, cipher, mode: backend.ffi.NULL
)
cipher = Cipher(
DummyCipher(), DummyMode(), backend=b,
)
with pytest.raises(UnsupportedAlgorithm):
cipher.encryptor()
def test_handle_unknown_error(self):
with pytest.raises(SystemError):
backend._handle_error_code(0, 0, 0)
with pytest.raises(SystemError):
backend._handle_error_code(backend.lib.ERR_LIB_EVP, 0, 0)
with pytest.raises(SystemError):
backend._handle_error_code(
backend.lib.ERR_LIB_EVP,
backend.lib.EVP_F_EVP_ENCRYPTFINAL_EX,
0
)
with pytest.raises(SystemError):
backend._handle_error_code(
backend.lib.ERR_LIB_EVP,
backend.lib.EVP_F_EVP_DECRYPTFINAL_EX,
0
)
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