#!/usr/bin/env python3

# hash_to_password.py
#
# Author: Intel A80486DX2-66
# License: Creative Commons Zero 1.0 Universal or Unlicense
# SPDX-License-Identifier: CC0-1.0 OR Unlicense

from hashlib import sha3_512

divide_chunks = lambda x, n: [x[i:i + n] for i in range(0, len(x), n)]

hash_file = lambda file_path: sha3_512(open(file_path, "rb").read()).hexdigest()

hash_to_password = lambda hash_string, start_from, end_before: ''.join(
    [chr((int(''.join(byte), 16) % (end_before - start_from)) + start_from)
     for byte in divide_chunks(hash_string, 2)]
)

if __name__ == "__main__":
    from os.path import basename
    from sys import argv

    if len(argv) < 2:
        print(f"Usage: {basename(__file__)} <file to hash as password>")
        raise SystemExit

    ASCII_RANGE = {
        "start_from": 0x21,
        "end_before": 0x7F
    }

    print(
        hash_to_password(
            hash_file(argv[1]),
            ASCII_RANGE["start_from"],
            ASCII_RANGE["end_before"]
        )
    )