83 lines
1.9 KiB
Python
83 lines
1.9 KiB
Python
# dead simple dictionary attack for fixed-length passwords.
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# this is far from optimal.
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from collections import defaultdict
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import argparse
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import sys
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import random
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program = sys.argv[0]
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args = sys.argv[1:]
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parser = argparse.ArgumentParser(
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description="attack: produce fixed-length strings from dictionaries")
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parser.add_argument(
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'length', type=int,
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help="the length of the strings to output")
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parser.add_argument(
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'path', metavar='text-file', nargs='+',
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help="a dictionary file containing one string per line")
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parser.add_argument(
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'-n', metavar='limit', type=float, default='inf',
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help="output this many strings and exit")
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parser.add_argument(
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'-s', metavar='seed', type=int, default=None,
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help="use as a seed for the random number generator")
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a = parser.parse_args(args)
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seed = a.s
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limit = a.n
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paths = a.path
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fixed_length = a.length
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del a
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lines = []
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for path in paths:
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with open(path, "r") as f:
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for line in f:
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lines.append(line.strip('\r\n'))
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nlines = defaultdict(lambda: [])
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ncount = defaultdict(lambda: 0)
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for line in lines:
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length = len(line)
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if length == 0 or length > fixed_length:
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continue
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nlines[length].append(line)
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ncount[length] += 1
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del lines
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if seed is not None:
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random.seed(seed)
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lengths = list(ncount.keys())
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length_weights = list(ncount.values())
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i = 0
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while i < limit:
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s = ''
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new_weights = length_weights.copy()
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while len(s) < fixed_length:
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if len(s) > 0:
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for j, length in enumerate(lengths):
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if len(s) + length > fixed_length:
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new_weights[j] = 0
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if sum(new_weights) == 0:
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s = ''
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new_weights = length_weights.copy()
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continue
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chosen_length = random.choices(lengths, new_weights)[0]
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s += random.choice(nlines[chosen_length])
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try:
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print(s)
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except OSError:
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# pipe closed.
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break
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i += 1
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