29 lines
644 B
Python
Executable File
29 lines
644 B
Python
Executable File
#! /usr/bin/env python3
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import argparse
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import sys
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def main() -> int:
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# Handle program arguments
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ap = argparse.ArgumentParser(
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prog="aprs-passcode",
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description="Calculate the passcode used for APRS-IS authentication",
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)
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ap.add_argument("callsign", help="APRS callsign")
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args = ap.parse_args()
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# Perform passcode calculation
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callsign = args.callsign.upper().split("-")[0]
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code = 0x73E2
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for i, char in enumerate(callsign):
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code ^= ord(char) << (8 if not i % 2 else 0)
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passcode = code & 0x7FFF
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print(passcode)
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return 0
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if __name__ == "__main__":
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sys.exit(main())
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