39 lines
1.3 KiB
Python
39 lines
1.3 KiB
Python
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import itertools
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import string
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from modes.hash_mode import HashMode
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class CollisionsTest:
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"""
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Грубый поиск коллизий: перебираем строки до max_len
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из заданного алфавита и проверяем, совпадут ли хэши.
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"""
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def run(self, variant: str, max_len: int = 3, alphabet: str = "alnum", bytes: int = 16) -> dict:
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hasher = HashMode()
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seen = {}
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# выбор алфавита
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if alphabet == "alnum":
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chars = string.ascii_lowercase + string.digits
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elif alphabet == "alpha":
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chars = string.ascii_lowercase
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elif alphabet == "digits":
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chars = string.digits
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else:
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raise ValueError(f"Неизвестный алфавит: {alphabet}")
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for length in range(1, max_len + 1):
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for msg_tuple in itertools.product(chars, repeat=length):
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msg = "".join(msg_tuple)
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h = hasher.run(variant, msg, bytes=bytes)
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if h in seen:
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return {
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"collision_found": True,
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"hash": h,
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"messages": [seen[h], msg],
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}
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seen[h] = msg
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return {"collision_found": False}
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