{"id":1478,"date":"2025-10-12T22:06:02","date_gmt":"2025-10-12T14:06:02","guid":{"rendered":"https:\/\/blog.shangwendada.top\/?p=1478"},"modified":"2025-10-12T22:06:02","modified_gmt":"2025-10-12T14:06:02","slug":"2025hncpcgogogo","status":"publish","type":"post","link":"https:\/\/blog.shangwendada.top\/index.php\/2025\/10\/12\/2025hncpcgogogo\/","title":{"rendered":"[2025HNCPC]GOGOGO"},"content":{"rendered":"

\u76f4\u63a5\u5b9a\u4f4d\u903b\u8f91<\/p>\n

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\u53ef\u4ee5\u770b\u5230\u5982\u4e0bBase32\u7f16\u7801\u8868\uff1a13456789ABCDEFGHJKLMNPQRSTUVWXYZ<\/p>\n

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\nMASK64 = (1 << 64) - 1\nCUSTOM_B32_ALPHABET = "13456789ABCDEFGHJKLMNPQRSTUVWXYZ"\n\ndef rol(x, r):\n    r &= 63\n    return ((x << r) & MASK64) | ((x & MASK64) >> (64 - r))\n\ndef byteswap64(x):\n    return int.from_bytes(x.to_bytes(8, 'little')[::-1], 'little')\n\ndef bit_permute_steps(x):\n    x = ((x >> 1) & 0x5555555555555555) | ((x & 0x5555555555555555) << 1)\n    x = ((x >> 2) & 0x3333333333333333) | ((x & 0x3333333333333333) << 2)\n    x = ((x >> 4) & 0x0F0F0F0F0F0F0F0F) | ((x & 0x0F0F0F0F0F0F0F0F) << 4)\n    return x & MASK64\n\ndef custom_base32_encode(data: bytes) -> str:\n    bits = 0\n    bitlen = 0\n    out = []\n    for byte in data:\n        bits = (bits << 8) | byte\n        bitlen += 8\n        while bitlen >= 5:\n            bitlen -= 5\n            index = (bits >> bitlen) & 0x1F\n            out.append(CUSTOM_B32_ALPHABET[index])\n    if bitlen > 0:\n        index = (bits << (5 - bitlen)) & 0x1F\n        out.append(CUSTOM_B32_ALPHABET[index])\n    return ''.join(out)\n\ndef transform(inp: str) -> str:\n    if len(inp) < 41:\n        raise ValueError("input length must be at least 41")\n    s = inp[5:5+36]\n    s = s[::-1]\n\n    out_bytes = bytearray()\n    state = 0xDEADBEEFCAFEBABE\n\n    for i in range(0, len(s), 8):\n        blk = s[i:i+8].encode('latin1')\n        if len(blk) < 8:\n            blk = blk + b'\\x00' * (8 - len(blk))\n        x = int.from_bytes(blk, 'big')\n        x = rol(x, 13)\n        x ^= state\n        x = rol(x, 32)\n        v46 = bit_permute_steps(x)\n        v21 = byteswap64(v46)\n        state = v21 ^ rol(state, 7)\n        out_bytes += (v46 & MASK64).to_bytes(8, 'little')\n\n    b32 = custom_base32_encode(bytes(out_bytes)).upper()\n    parts = [b32[i:i+6] for i in range(0, len(b32), 6)]\n    return '-'.join(parts)\n\nif __name__ == "__main__":\n    test_inp = "1" * 41\n    print("output:", transform(test_inp))\n<\/code><\/pre>\n
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\u63a5\u4e0b\u6765\u5c31\u662f\u53cd\u5411\u89e3\u5bc6\u4e86\uff1a<\/p>\n
from typing import Tuple\n\nMASK64 = (1 << 64) - 1\nCUSTOM_B32_ALPHABET = "13456789ABCDEFGHJKLMNPQRSTUVWXYZ"\nALPHABET_MAP = {c: i for i, c in enumerate(CUSTOM_B32_ALPHABET)}\n\ndef rol(x: int, r: int) -> int:\n    r &= 63\n    return ((x << r) & MASK64) | ((x & MASK64) >> (64 - r))\n\ndef byteswap64(x: int) -> int:\n    return int.from_bytes(x.to_bytes(8, 'little')[::-1], 'little')\n\ndef bit_permute_steps(x: int) -> int:\n\n    x = ((x >> 1) & 0x5555555555555555) | ((x & 0x5555555555555555) << 1)\n    x &= MASK64\n    x = ((x >> 2) & 0x3333333333333333) | ((x & 0x3333333333333333) << 2)\n    x &= MASK64\n    x = ((x >> 4) & 0x0F0F0F0F0F0F0F0F) | ((x & 0x0F0F0F0F0F0F0F0F) << 4)\n    x &= MASK64\n    return x\n\ndef custom_base32_decode(s: str) -> bytes:\n\n    s = ''.join(ch for ch in s if ch not in '- \\n\\r\\t')\n    bits = 0\n    bitlen = 0\n    out = bytearray()\n    for ch in s:\n        if ch not in ALPHABET_MAP:\n            raise ValueError(f"invalid base32 char: {ch!r}")\n        val = ALPHABET_MAP[ch]\n        bits = (bits << 5) | val\n        bitlen += 5\n        while bitlen >= 8:\n            bitlen -= 8\n            byte = (bits >> bitlen) & 0xFF\n            out.append(byte)\n\n    return bytes(out)\n\ndef inverse_transform(encoded: str) -> Tuple[str, bytes]:\n\n    raw = custom_base32_decode(encoded)\n\n    if len(raw) % 8 != 0:\n\n        raw = raw + b'\\x00' * (8 - (len(raw) % 8))\n\n    nblocks = len(raw) \/\/ 8\n    state = 0xDEADBEEFCAFEBABE\n    recovered_bytes = bytearray()\n\n    for i in range(nblocks):\n        v46_le = raw[i*8:(i+1)*8]\n        v46 = int.from_bytes(v46_le, 'little')\n        x3 = bit_permute_steps(v46)\n        x2 = rol(x3, 32)\n        x1 = x2 ^ state\n        b_be = rol(x1, 64 - 13)\n        b_be &= MASK64\n\n        blk_be = b_be.to_bytes(8, 'big')\n        recovered_bytes += blk_be\n\n        v21 = byteswap64(v46)\n        state = v21 ^ rol(state, 7)\n        state &= MASK64\n\n    recovered36 = bytes(recovered_bytes[:36])\n\n    s_recovered = recovered36[::-1].decode('latin1')\n    return s_recovered, recovered36\n\nif __name__ == "__main__":\n    encoded = "LYHX68-AZF785-6QU5E9-JFZY8B-E6ZEKU-RCQ65Y-QJB76Y-37MQXQ-5UJJ"\n    recovered_str, recovered_bytes = inverse_transform(encoded)\n    print("Encoded input: ", encoded)\n    print("Recovered 36-bytes (as latin1):", repr(recovered_str))\n<\/code><\/pre>\n
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