Treasure hunt - 2025

[vil02]

The challenge is still active: #355 (comment)

The best way to get an overview of this project is to see it in action. Below, you will find an example treasure hunt generated for Hacktoberfest 2025. Try to solve this puzzle and have fun. There is some small surprise for the quickest solvers.

Caution

I am just a random guy on the internet! Before running this code, please review it and consider running it using some online tool like:
https://www.onlinegdb.com/online_python_compiler

# generated with puzzle-generator 0.16.8
#
# https://pypi.org/project/puzzle-generator/
# https://github.com/vil02/puzzle_generator/

import base64
import hashlib
import hmac
import sys
import typing

BYTEORDER: typing.Literal["little", "big"] = "little"


def sign_bytes(in_bytes: bytes, in_key: bytes, params) -> bytes:
    return hmac.digest(msg=in_bytes, key=in_key, **params)


def derive_key(**kwargs) -> bytes:
    return hashlib.scrypt(**kwargs)


def split_data_and_signature(
    in_bytes: bytes, signature_size: int
) -> tuple[bytes, bytes]:
    if len(in_bytes) < signature_size:
        raise ValueError("in_bytes is shorter than signature_size")
    data = in_bytes[:-signature_size]
    signature = in_bytes[-signature_size:]
    return data, signature


def digest_size(params) -> int:
    hasher = hashlib.new(params["digest"])
    return hasher.digest_size


def xor_bytes(in_bytes: bytes, in_key: bytes) -> bytes:
    """xors the in_bytes with a sequence of bytes with in_key"""
    return bytes(_d ^ _k for (_d, _k) in zip(in_bytes, in_key, strict=True))


def bytestr_to_bytes(in_str: str) -> bytes:
    return base64.b64decode(in_str)


def bytes_to_int(in_bytes: bytes) -> int:
    bytes_length = int(in_bytes[0])
    if len(in_bytes) != bytes_length + 1:
        raise ValueError("in_bytes has wrong structure")
    return int.from_bytes(in_bytes[1:], byteorder=BYTEORDER)


def split(in_bytes: bytes) -> tuple[str, bytes]:
    end_of_length = int(in_bytes[0]) + 1
    str_as_bytes_len = bytes_to_int(in_bytes[:end_of_length])
    end_of_str = end_of_length + str_as_bytes_len
    str_as_bytes = in_bytes[end_of_length:end_of_str]
    res_bytes = in_bytes[end_of_str:]
    return str_as_bytes.decode(), res_bytes


def decrypt_data(
    in_rest: bytes,
    in_pass: str,
    in_decrypt: typing.Callable[[bytes, bytes], bytes | None],
) -> None | tuple[str, bytes]:
    res = in_decrypt(in_rest, in_pass.encode())
    if res is None:
        return None
    return split(res)


def must_be_nonempty(in_list: list[bytes]) -> None:
    if not in_list:
        raise ValueError("in_list must be nonempty")


def get_decrypt(
    proc_spices: list[bytes],
    signature_spices: list[bytes],
    scrypt_params,
    signature_params,
) -> typing.Callable[[bytes, bytes], bytes | None]:
    must_be_nonempty(proc_spices)
    must_be_nonempty(signature_spices)

    def _decrypt(in_bytes: bytes, in_pass: bytes) -> bytes | None:
        for proc_spice in proc_spices:
            key = derive_key(
                password=in_pass + proc_spice, dklen=len(in_bytes), **scrypt_params
            )
            data = xor_bytes(in_bytes, key)
            decrypted, signature = split_data_and_signature(
                data, digest_size(signature_params)
            )

            if any(
                sign_bytes(decrypted + _, in_pass, signature_params) == signature
                for _ in signature_spices
            ):
                return decrypted
        return None

    return _decrypt


def run_puzzle(
    in_puzzle: tuple[str, bytes],
    in_decrypt: typing.Callable[[bytes, bytes], bytes | None],
    get_answer: typing.Callable[[], str],
) -> None:
    question, rest = in_puzzle
    print(question)
    if rest:
        this_pass = get_answer()
        new_puzzle = decrypt_data(rest, this_pass, in_decrypt)
        if new_puzzle is None:
            print("This is a wrong answer. Try again!")
            sys.exit(1)
        else:
            run_puzzle(new_puzzle, in_decrypt, get_answer)


_PUZZLE = (
    """What is 2024+1?""",
    bytestr_to_bytes(
        "ZSDdQGGDGt0MdpXwF/RNwWaBY1lGHsVcGZtlkRGl22259jaG6ufwIgwJQVDVLue4sxDCVbXxK368Lw"
        "r+aCC0bASOF7/h6ZrtdOGNMU7595bGRaD3XMyUaThF72PzNIM2/4ttOE7FK052EPEJc+wsioXYTQKt"
        "PvbQDvRLmL9EO99JKaOKawPJpAb8Q5yeVzZZLI5DdRUEWCuAbQi1nRuvCMiti0p/5qW7QqNt3bJqNz"
        "liqJZLaBui1978hjRB/UTT+4pS+BYqKVr5rZc9pFopALB748K4DZW8IPlvaDNt6XPXvW/jKOPxRf0i"
        "fBgU7TWHw3knCTrqnr5YikO4Tacy0OYZ0x0N1Th3D9Zkkh8nl/rQmyWSFHreCwy2jJoPfiDhFmDaML"
        "SF1HRfl4/0rCwrdp4yKuDV7Z5fpzHr17/V/QVd6/C+G29ki53Sx/8V7+CU579Tf8RK44UTgKgNqS9r"
        "0Cu26zMb3XxFgzKIt7gq6ivvOnZeVm16fldYroZ6Yk9SSfuTG6XmuidLBAU8a5wk4japQu/RPLMqnK"
        "fVPvtH9+5hvjJplBkDiom6nKIfMhXDkH8ziPYfd3sZQDwxKJchEsPnumJaislrf+XdAAL0nJBw7ozW"
        "Ypjor53S1NjD6V4sC8dx0nJytob6K2UxNqzHDUKC2a/zeJ6dwGRcDVjZhMVAMwsfm0M3wNgm8vmnsq"
        "SHkE2zTFGq0b0mi1sdHRAuY8sx4UoC3nqIFbuJmlDFQvqoZu1G7natUD4wLTKrCJoffZpnxBAd55vf"
        "qc5ivpwozYd7w651haDAtmksl0j2RbmccZsucg9OnFDg+3xgU2DhuJJJrxbQjokGTLY2kXahrVEDqI"
        "Lmlx+5zfPp7HRVxN5Xrpmwboykuy2+uHDWraPnuldze8pnkzjFxmXWAHy85Nqr0PpiRGHb35ryhXwc"
        "tpXfq6rL+6u52wO+uoIdqnDM+zfB0k+/lCYNhPbcBRyDMx1LSc7a+6FFONxjjRZogqcaedcc8teYw+"
        "rYkHCi38a/NeoBQqLVwQG41PN109vBNZDj4Flt4WxRT0TBa4dGvW+9Zhule5iHYBW6/5afkN05muy/"
        "ml0nV2CHudbsbmWbb4gOI9Y+OThfManF2X7yMEywTvdpYOrkMwUOgLfVl/HTQ3zV1kktSQhLxt74+a"
        "OYMRlQUjw5KtGsKIGIzBffEuDGpTq0gjGAgPiJ4fHDJEy/uqZoj+IQnAFu9OdiJVx1tQxpXZDKv8eP"
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        "xhlvFP+HjVX+0/yS0oKyv0IJmUJ+XoeOQXFq5mACy2SMOO5mHoC8DSuNHeGY8amPnxHlP8hKULOKXo"
        "xtwrdpJDW+hoC//MNhlGss8r/hueZnghcrxxsjzVCFIgIBhmjVtZMv6wIfHOOi4hmHeaj1m/x8lvSy"
        "ixNHIrjjntMEhSbwe2Ma+pmmHsFqkdn1+GwbYElGRIDGHTJJO41tT2QoFndJl7Lw=="
    ),
)
_PROC_SPICES = [
    bytestr_to_bytes(_)
    for _ in [
        "Q9tE",
        "LPnT",
        "1fnP",
        "V+3e",
        "xmvp",
        "HweU",
        "CPUU",
        "RhO0",
        "QaHe",
        "XXCL",
        "jT+h",
        "CV3b",
        "MQ9T",
        "Zosa",
        "Yuiv",
        "4yAy",
        "gFk2",
        "qX5t",
        "dxEN",
        "w7Wt",
    ]
]
_SIGNATURE_SPICES = [
    bytestr_to_bytes(_)
    for _ in [
        "JAm2",
        "4KfX",
        "LsZ9",
        "OW3H",
        "64Py",
        "MAw4",
        "sMLN",
        "TVS9",
        "lL08",
        "AECo",
        "SwYf",
        "Bd/p",
        "ATJW",
        "eY3G",
        "dv8o",
        "T3mh",
        "TIh1",
        "vDRJ",
        "t43i",
        "LRkq",
    ]
]
_SCRYPT_PARAMS = {
    "n": 16384,
    "r": 8,
    "p": 1,
    "maxmem": 29884416,
    "salt": bytestr_to_bytes("4redAb7kz6ZZisSHk7RleA=="),
}
_SIGNATURE_PARAMS = {"digest": "sha3_512"}
_DECRYPT = get_decrypt(
    _PROC_SPICES, _SIGNATURE_SPICES, _SCRYPT_PARAMS, _SIGNATURE_PARAMS
)
run_puzzle(_PUZZLE, _DECRYPT, input)

[GitHub-User9999]

Can I do

[vil02]

Can I do

@GitHub-User9999: sure, feel free to solve the above puzzle. Good luck!

[mathurojus]

The answer to the puzzle is: 2025. May I proceed to create a pull request solving this as a Hacktoberfest 2025 contribution?

[vil02]

The answer to the puzzle is: 2025.

This is the answer to the first question. Try to solve the entire puzzle (but please do not spoil the fun for the others by posting the entire solution here).

[prateekverma145]

please assign it to me

[vil02]

please assign it to me

@prateekverma145: there is no need to be assigned to this issue. Just run the code above (after reviewing it!) and solve the puzzle it represents. Good luck!

[suvendukungfu]

please assign this issue

[vil02]

The first person to solve this puzzle will be assigned to this issue 😄 .

[vil02]

The Hacktoberfest 2025 is over, but the puzzle remains unsolved (I am not aware of anyone who solved it). Now when the fever of creating pull-requests is over, one can have some actual fun. As mentioned above, there is a small reward waiting for the quickest solvers.