dehasher.py

#!/usr/bin/python3
import argparse
import hashlib
import json
import os
import socket
import sys
import time


def permutations(hashcd, charset, length):
    """
    Brute force MD5 hash decoder
    :param hashcd: cipher to decode
    :param charset: character set to mix
    :param length: number of characters to permutate
    :return: decoded hash and result status
    """
    seen = set()
    res = ''
    result = False
    queue = [((charset[i],), charset[:i] + charset[i + 1:]) for i in range(len(charset))]
    while queue:
        current, remaining = queue.pop(0)
        hashtxt = hashlib.md5(''.join(current).encode('UTF-8')).hexdigest().lower()
        if len(current) == length and current not in seen:
            if hashtxt == hashcd.lower():
                res = ''.join(current)
                result = True
                break
            seen.add(current)
            continue
        for i in range(len(remaining)):
            new = current + (remaining[i],)
            new_remaining = remaining[:i] + remaining[i + 1:]
            queue.append((new, new_remaining))
    return res, result


if __name__ == "__main__":
    parser = argparse.ArgumentParser()
    parser.add_argument("--cipher", "-c", help="cipher to decode")
    parser.add_argument("--set", "-s", help="character set to mix")
    parser.add_argument("--min", "-n", help="minimum number of characters")
    parser.add_argument("--max", "-x", help="maximum number of characters")
    parser.add_argument("--output", "-o", help="output path")
    args = parser.parse_args()

    found = False
    answer = None
    success = None

    for x in range(int(args.min), int(args.max) + 1):
        answer, success = permutations(args.cipher, list(args.set), x)
        if success:
            break
    message = f'{{"Hash":"{args.cipher}", "Text":"{answer}", "Result":"{"SUCCESS" if success else "FAIL"}"}}'
    if args.output is not None:
        filename = f'{args.output}/{socket.getfqdn()}_{os.path.basename(sys.argv[0])}_{int(time.time())}.out'
        with open(filename, 'a') as the_file:
            the_file.write(json.dumps(json.loads(message), indent=4) + os.linesep)
    else:
        print(message)