42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
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#!/usr/bin/env python
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#
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# This work is licensed under the Creative Attribution-NonCommercial-ShareAlike
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# 3.0 Unported License.To view a copy of this license, visit
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# http://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to
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# Creative Commons, 444 Castro Street, Suite 900, Mountain View,
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# California, 94041, USA.
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from __future__ import print_function
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from bitarray import bitarray
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# Does anybody read this stuff? There's a PEP somewhere that says I should do this.
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__author__ = 'Cortney T. Buffington, N0MJS'
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__copyright__ = 'Copyright (c) 2016 Cortney T. Buffington, N0MJS and the K0USY Group'
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__credits__ = 'Jonathan Naylor, G4KLX'
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__license__ = 'Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported'
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__maintainer__ = 'Cort Buffington, N0MJS'
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__email__ = 'n0mjs@me.com'
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def csum5(_data):
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_data = bytearray(_data)
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accum = 0
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assert len(_data) == 9, 'csum5 expected 9 bytes of data and got something else'
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for i in xrange(9):
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accum += _data[i]
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accum = chr(accum % 31)
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csum = bitarray()
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csum.frombytes(accum)
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del csum[0:3]
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return csum
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if __name__ == '__main__':
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from binascii import b2a_hex as h
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message = '\x00\x10\x20\x00\x0c\x30\x2f\x9b\xe5'
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result = csum5(message)
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print(result, type(result))
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