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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 binascii
import pretend
import pytest
from cryptography.primitives.block import BlockCipher, ciphers, modes
from cryptography.primitives.block.base import _Operation
class TestBlockCipher(object):
def test_instantiate_without_api(self):
BlockCipher(
ciphers.AES(binascii.unhexlify(b"0" * 32)),
modes.CBC(binascii.unhexlify(b"0" * 32))
)
def test_use_after_finalize(self, api):
cipher = BlockCipher(
ciphers.AES(binascii.unhexlify(b"0" * 32)),
modes.CBC(binascii.unhexlify(b"0" * 32)),
api
)
cipher.encrypt(b"a" * 16)
cipher.finalize()
with pytest.raises(ValueError):
cipher.encrypt(b"b" * 16)
with pytest.raises(ValueError):
cipher.finalize()
def test_encrypt_with_invalid_operation(self, api):
cipher = BlockCipher(
ciphers.AES(binascii.unhexlify(b"0" * 32)),
modes.CBC(binascii.unhexlify(b"0" * 32)),
api
)
cipher._operation = _Operation.decrypt
with pytest.raises(ValueError):
cipher.encrypt(b"b" * 16)
def test_finalize_with_invalid_operation(self, api):
cipher = BlockCipher(
ciphers.AES(binascii.unhexlify(b"0" * 32)),
modes.CBC(binascii.unhexlify(b"0" * 32)),
api
)
cipher._operation = pretend.stub(name="wat")
with pytest.raises(ValueError):
cipher.finalize()
def test_unaligned_block_encryption(self, api):
cipher = BlockCipher(
ciphers.AES(binascii.unhexlify(b"0" * 32)),
modes.ECB(),
api
)
ct = cipher.encrypt(b"a" * 15)
assert ct == b""
ct += cipher.encrypt(b"a" * 65)
assert len(ct) == 80
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