125 lines
3.6 KiB
Python
125 lines
3.6 KiB
Python
# SPDX-License-Identifier: MIT
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#
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# Copyright (c) 2017 PySecretHandshake contributors (see AUTHORS for more details)
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in all
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# copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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"""Tests for utility functions"""
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import math
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from types import GeneratorType
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from typing import List, Sequence, TypeVar
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import pytest
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from secret_handshake.util import bytes_to_long, inc_nonce, long_to_bytes, split_chunks
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T = TypeVar("T")
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@pytest.mark.parametrize(
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"in_,out",
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(
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(b"\x00\x00\x00\x00", b"\x00" * 23 + b"\x01"),
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(b"\xff" * 24, b"\x00" * 24),
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),
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)
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def test_inc_nonce(in_: bytes, out: bytes) -> None:
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"""Test the inc_nonce function"""
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result = inc_nonce(in_)
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assert len(result) == 24
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assert result == out
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def test_split_chunks_is_generator() -> None:
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"""Test if split_chunks returns a generator"""
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assert isinstance(split_chunks([], 1), GeneratorType)
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@pytest.mark.parametrize("size", (-123, -1, 0))
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def test_nonpositive_chunk_size(size: int) -> None:
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"""Test if split_chunks() with non-positive chunk sizes raise an error"""
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with pytest.raises(ValueError) as ctx:
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list(split_chunks(b"", size))
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assert str(ctx.value) == "chunk_size must be greater than zero"
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@pytest.mark.parametrize(
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"in_,chunksize,out",
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(
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(b"asdfg", 2, [b"as", b"df", b"g"]),
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(b"asdfgh", 3, [b"asd", b"fgh"]),
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),
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)
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def test_split_chunks(in_: Sequence[T], chunksize: int, out: List[Sequence[T]]) -> None:
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"""Test if split_chunks splits the input into equal chunks"""
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assert list(split_chunks(in_, chunksize)) == out
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@pytest.mark.parametrize(
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"in_,out",
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(
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(0, b"\x00"),
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(1, b"\x01"),
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(4278255360, b"\xff\x00\xff\x00"),
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(65536, b"\x01\x00\x00"),
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(4546694913, b"\x01\x0f\x01\x0f\x01"),
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),
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)
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@pytest.mark.parametrize("blocksize", (0, 4, 6))
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def test_long_to_bytes(in_: int, out: bytes, blocksize: int) -> None:
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"""Test long_to_bytes"""
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result = long_to_bytes(in_, blocksize=blocksize)
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if blocksize:
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block_count = math.ceil(len(out) / blocksize)
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else:
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block_count = 1
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padding = b"\x00" * blocksize * block_count
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expected = (padding + out)[-(blocksize * block_count) :]
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if blocksize:
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assert not len(result) % blocksize
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assert result == expected
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@pytest.mark.parametrize(
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"in_,out",
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(
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(b"\x00\x00\x00\x00", 0),
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(b"\x00\x00\x00\x01", 1),
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(b"\xff\x00\xff\x00", 4278255360),
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(b"\x01\x00\x00", 65536),
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(b"\x01\x0f\x01\x0f\x01", 4546694913),
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),
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)
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def test_bytes_to_long(in_: bytes, out: int) -> None:
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"""Test bytes_to_long"""
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assert bytes_to_long(in_) == out
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