PySecretHandshake/tests/test_util.py

76 lines
2.4 KiB
Python

# SPDX-License-Identifier: MIT
#
# Copyright (c) 2017 PySecretHandshake contributors (see AUTHORS for more details)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
"""Tests for utility functions"""
import math
import pytest
from secret_handshake.util import bytes_to_long, long_to_bytes
@pytest.mark.parametrize(
"in_,out",
(
(0, b"\x00"),
(1, b"\x01"),
(4278255360, b"\xff\x00\xff\x00"),
(65536, b"\x01\x00\x00"),
(4546694913, b"\x01\x0f\x01\x0f\x01"),
),
)
@pytest.mark.parametrize("blocksize", (0, 4, 6))
def test_long_to_bytes(in_: int, out: bytes, blocksize: int) -> None:
"""Test long_to_bytes"""
result = long_to_bytes(in_, blocksize=blocksize)
if blocksize:
block_count = math.ceil(len(out) / blocksize)
else:
block_count = 1
padding = b"\x00" * blocksize * block_count
expected = (padding + out)[-(blocksize * block_count) :]
if blocksize:
assert not len(result) % blocksize
assert result == expected
@pytest.mark.parametrize(
"in_,out",
(
(b"\x00\x00\x00\x00", 0),
(b"\x00\x00\x00\x01", 1),
(b"\xff\x00\xff\x00", 4278255360),
(b"\x01\x00\x00", 65536),
(b"\x01\x0f\x01\x0f\x01", 4546694913),
),
)
def test_bytes_to_long(in_: bytes, out: int) -> None:
"""Test bytes_to_long"""
assert bytes_to_long(in_) == out