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31 lines
713 B
Python
31 lines
713 B
Python
#!/usr/bin/env python3 -B
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# coding=utf-8
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"""
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Copyright (C) 2022-2024 Plato Mavropoulos
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"""
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# Get Checksum 16-bit
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def checksum_16(data: bytes | bytearray, value: int = 0, order: str = 'little') -> int:
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""" Calculate Checksum-16 of data, controlling IV and Endianess """
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for idx in range(0, len(data), 2):
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# noinspection PyTypeChecker
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value += int.from_bytes(data[idx:idx + 2], byteorder=order) # type: ignore
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value &= 0xFFFF
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return value
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# Get Checksum 8-bit XOR
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def checksum_8_xor(data: bytes | bytearray, value: int = 0) -> int:
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""" Calculate Checksum-8 XOR of data, controlling IV """
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for byte in data:
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value ^= byte
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value ^= 0x0
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return value
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