chuanqi/cq2_sdk/scripts/decrypt_srvlist.py

"""Decrypt the game serverlist using XXTEA with the game_signkey from modlist.

modlist says isEncrypt=1 and provides game_signkey per sub-module:
  玖扬复古176 (206923): game_signkey = 47f67f306cbdffa3a6606292c1a3fa01

Per cq2-00 docs, client Lua is XXTEA-encrypted with key=34UFXMgtkz.
The serverlist is likely XXTEA with game_signkey (hex-decoded or raw).
Try multiple key derivations.
"""
import asyncio
import base64
import sys

import httpx
import xxtea

if hasattr(sys.stdout, "reconfigure"):
    sys.stdout.reconfigure(encoding="utf-8", errors="replace")

SIGNKEY_HEX = "47f67f306cbdffa3a6606292c1a3fa01"
LUA_KEY = "34UFXMgtkz"


async def main() -> None:
    url = "https://list-box.dhsf.xqhuyu.com/serverlist/110585/serverlist.txt"
    async with httpx.AsyncClient(timeout=15, follow_redirects=True) as c:
        r = await c.get(url)
        raw = r.content
    print(f"downloaded {len(raw)} bytes")

    key_candidates = [
        ("signkey raw ascii (32B)", SIGNKEY_HEX.encode()),
        ("signkey hex-decoded (16B)", bytes.fromhex(SIGNKEY_HEX)),
        ("lua key 34UFXMgtkz", LUA_KEY.encode()),
        ("lua key padded to 16", LUA_KEY.encode().ljust(16, b"\0")),
        ("signkey first16", SIGNKEY_HEX[:16].encode()),
    ]

    for label, key in key_candidates:
        try:
            dec = xxtea.decrypt(raw, key)
            if not dec:
                print(f"[{label}] -> empty result")
                continue
            # Check if it looks like text/JSON
            head = dec[:60]
            printable = sum(1 for b in dec[:200] if 32 <= b < 127 or b in (9, 10, 13))
            ratio = printable / min(len(dec), 200)
            print(f"[{label}] -> {len(dec)} bytes, printable={ratio:.0%}, head={head[:50]!r}")
            if ratio > 0.85:
                print("  *** LOOKS LIKE TEXT! First 500 chars:")
                try:
                    txt = dec.decode("utf-8", errors="replace")
                    print(txt[:500])
                except Exception:
                    pass
        except Exception as e:
            print(f"[{label}] -> error: {type(e).__name__}: {str(e)[:80]}")


asyncio.run(main())