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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.hazmat.primitives import padding
class TestPKCS7(object):
@pytest.mark.parametrize("size", [127, 4096, -2])
def test_invalid_block_size(self, size):
with pytest.raises(ValueError):
padding.PKCS7(size)
@pytest.mark.parametrize(("size", "padded"), [
(128, b"1111"),
(128, b"1111111111111111"),
(128, b"111111111111111\x06"),
(128, b""),
])
def test_invalid_padding(self, size, padded):
padder = padding.PKCS7(size)
with pytest.raises(ValueError):
padder.unpad(padded)
@pytest.mark.parametrize(("size", "unpadded", "padded"), [
(
128,
b"1111111111",
b"1111111111\x06\x06\x06\x06\x06\x06",
),
(
128,
b"111111111111111122222222222222",
b"111111111111111122222222222222\x02\x02",
),
])
def test_pad(self, size, unpadded, padded):
padder = padding.PKCS7(size)
assert padder.pad(unpadded) == padded
@pytest.mark.parametrize(("size", "unpadded", "padded"), [
(
128,
b"1111111111",
b"1111111111\x06\x06\x06\x06\x06\x06",
),
(
128,
b"111111111111111122222222222222",
b"111111111111111122222222222222\x02\x02",
),
])
def test_unpad(self, size, unpadded, padded):
padder = padding.PKCS7(size)
assert padder.unpad(padded) == unpadded
def test_use_after_finalize(self):
p = padding.PKCS7(128)
padder = p.padder()
b = padder.finalize()
with pytest.raises(ValueError):
padder.update(b"")
with pytest.raises(ValueError):
padder.finalize()
unpadder = p.unpadder()
unpadder.update(b)
unpadder.finalize()
with pytest.raises(ValueError):
unpadder.update(b"")
with pytest.raises(ValueError):
unpadder.finalize()
|
