tests/primitives/test_ciphers.py

# 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
#
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# 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 binascii

import pytest

from cryptography.primitives.block.ciphers import AES


class TestAES(object):
    @pytest.mark.parametrize(("key", "keysize"), [
        (b"0" * 32, 128),
        (b"0" * 48, 192),
        (b"0" * 64, 256),
    ])
    def test_key_size(self, key, keysize):
        cipher = AES(binascii.unhexlify(key))
        assert cipher.key_size == keysize

    def test_invalid_key_size(self):
        with pytest.raises(ValueError):
            AES(binascii.unhexlify(b"0" * 12))