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48 lines
1.9 KiB
Python
48 lines
1.9 KiB
Python
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"""
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The MIT License (MIT)
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Copyright (C) 2017 Andris Raugulis (moo@arthepsy.eu)
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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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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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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
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THE SOFTWARE.
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"""
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# pylint: disable=unused-import
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from typing import Dict, List, Set, Sequence, Tuple, Iterable # noqa: F401
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from typing import Callable, Optional, Union, Any # noqa: F401
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class SSH1_CRC32:
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def __init__(self) -> None:
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self._table = [0] * 256
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for i in range(256):
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crc = 0
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n = i
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for _ in range(8):
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x = (crc ^ n) & 1
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crc = (crc >> 1) ^ (x * 0xedb88320)
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n = n >> 1
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self._table[i] = crc
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def calc(self, v: bytes) -> int:
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crc, length = 0, len(v)
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for i in range(length):
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n = ord(v[i:i + 1])
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n = n ^ (crc & 0xff)
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crc = (crc >> 8) ^ self._table[n]
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return crc
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