Decode passwords stored in HeidiSQL

heididecode.py

#!/usr/bin/env python
from __future__ import print_function
import sys


def heidi_decode(hexstr):
    shift = int(hexstr[-1])
    l = [int(hexstr[i:i+2], 16) for i in range(0, len(hexstr), 2)]
    return ''.join(chr(v - shift) for v in l)


if __name__ == '__main__':
    """
    Accepts encoded password either from stdin or as cli argument
    Prints it's plaintext decoded version to stdout
    """

    if len(sys.argv) < 2:
        s = sys.stdin.readline().strip()
    else:
        s = sys.argv[1]

    passwd = heidi_decode(s)
    print(passwd)