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mai2: fix Exp and Chn encryption

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This commit is contained in:
zaphkito
2025-06-08 19:10:25 +00:00
committed by zaphkito
parent 3a8a67cee2
commit cf6666b866
3 changed files with 81 additions and 20 deletions
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74
titles/mai2/index.py
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@@ -38,7 +38,7 @@ class Mai2Servlet(BaseServlet):
def __init__(self, core_cfg: CoreConfig, cfg_dir: str) -> None:
super().__init__(core_cfg, cfg_dir)
self.game_cfg = Mai2Config()
self.hash_table: Dict[int, Dict[str, str]] = {}
self.hash_table: Dict[str, Dict[str, str]] = {}
if path.exists(f"{cfg_dir}/{Mai2Constants.CONFIG_NAME}"):
self.game_cfg.update(
yaml.safe_load(open(f"{cfg_dir}/{Mai2Constants.CONFIG_NAME}"))
@@ -97,16 +97,21 @@ class Mai2Servlet(BaseServlet):
self.logger.initted = True
for version, keys in self.game_cfg.crypto.keys.items():
if version < Mai2Constants.VER_MAIMAI_DX:
if int(str(version).split('_')[0]) < Mai2Constants.VER_MAIMAI_DX:
continue
if len(keys) < 3:
continue
if isinstance(version, int):
version_idx = version
else:
version_idx = int(version.split("_")[0])
self.hash_table[version] = {}
method_list = [
method
for method in dir(self.versions[version])
for method in dir(self.versions[version_idx])
if not method.startswith("__")
]
@@ -115,6 +120,21 @@ class Mai2Servlet(BaseServlet):
# remove the first 6 chars and the final 7 chars to get the canonical
# endpoint name.
method_fixed = inflection.camelize(method)[6:-7]
# This only applies for maimai DX International and later for some reason.
if (
isinstance(version, str)
and version.endswith("_int")
and version_idx >= Mai2Constants.VER_MAIMAI_DX_UNIVERSE
):
method_fixed += "MaimaiExp"
elif (
isinstance(version, str)
and version.endswith("_chn")
and version_idx >= Mai2Constants.VER_MAIMAI_DX_UNIVERSE # 1.00, 1.11 and 1.20 all use DX, but they add MaimaiChn in 1.20, we set 1.20 to use UNIVERSE code
):
method_fixed += "MaimaiChn"
hash = MD5.new((method_fixed + keys[2]).encode())
# truncate unused bytes like the game does
@@ -310,7 +330,7 @@ class Mai2Servlet(BaseServlet):
internal_ver = Mai2Constants.VER_MAIMAI_DX_BUDDIES
elif version >= 145 and version <150: # BUDDiES PLUS
internal_ver = Mai2Constants.VER_MAIMAI_DX_BUDDIES_PLUS
elif version >=150:
elif version >= 150: # PRiSM
internal_ver = Mai2Constants.VER_MAIMAI_DX_PRISM
elif game_code == "SDGA": # Int
@@ -334,47 +354,58 @@ class Mai2Servlet(BaseServlet):
internal_ver = Mai2Constants.VER_MAIMAI_DX_BUDDIES
elif version >= 145 and version <150: # BUDDiES PLUS
internal_ver = Mai2Constants.VER_MAIMAI_DX_BUDDIES_PLUS
elif version >=150:
elif version >= 150: # PRiSM
internal_ver = Mai2Constants.VER_MAIMAI_DX_PRISM
elif game_code == "SDGB": # Chn
if version < 110: # Muji
internal_ver = Mai2Constants.VER_MAIMAI_DX
elif version >= 110 and version < 120: # Muji
internal_ver = Mai2Constants.VER_MAIMAI_DX
internal_ver = Mai2Constants.VER_MAIMAI_DX_SPLASH # still DX, but need Splash to set encryption key
elif version >= 120 and version < 130: # Muji (LMAO)
internal_ver = Mai2Constants.VER_MAIMAI_DX
internal_ver = Mai2Constants.VER_MAIMAI_DX_UNIVERSE # still DX, but need UNIVERSE to set encryption key
elif version >= 130 and version < 140: # FESTiVAL
internal_ver = Mai2Constants.VER_MAIMAI_DX_FESTIVAL
elif version >= 140 and version < 150: # BUDDiES
internal_ver = Mai2Constants.VER_MAIMAI_DX_BUDDIES
elif version >=150:
elif version >= 150: # PRiSM
internal_ver = Mai2Constants.VER_MAIMAI_DX_PRISM
if all(c in string.hexdigits for c in endpoint) and len(endpoint) == 32:
if game_code == "SDGA":
crypto_cfg_key = f"{internal_ver}_int"
hash_table_key = f"{internal_ver}_int"
elif game_code == "SDGB":
crypto_cfg_key = f"{internal_ver}_chn"
hash_table_key = f"{internal_ver}_chn"
else:
crypto_cfg_key = internal_ver
hash_table_key = internal_ver
# If we get a 32 character long hex string, it's a hash and we're
# dealing with an encrypted request. False positives shouldn't happen
# as long as requests are suffixed with `Api`.
if internal_ver not in self.hash_table:
if hash_table_key not in self.hash_table:
self.logger.error(
"v%s does not support encryption or no keys entered",
version,
)
return Response(zlib.compress(b'{"stat": "0"}'))
elif endpoint.lower() not in self.hash_table[internal_ver]:
elif endpoint.lower() not in self.hash_table[hash_table_key]:
self.logger.error(
"No hash found for v%s endpoint %s",
version, endpoint
)
return Response(zlib.compress(b'{"stat": "0"}'))
endpoint = self.hash_table[internal_ver][endpoint.lower()]
endpoint = self.hash_table[hash_table_key][endpoint.lower()]
try:
crypt = AES.new(
bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][0]),
bytes.fromhex(self.game_cfg.crypto.keys[crypto_cfg_key][0]),
AES.MODE_CBC,
bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][1]),
bytes.fromhex(self.game_cfg.crypto.keys[crypto_cfg_key][1]),
)
req_raw = crypt.decrypt(req_raw)
@@ -392,7 +423,10 @@ class Mai2Servlet(BaseServlet):
if (
not encrypted
and self.game_cfg.crypto.encrypted_only
and version >= 110
and (
# SDEZ start from 1.10, SDGA and SDGB keep use encryption from 1.00
internal_ver >= Mai2Constants.VER_MAIMAI_DX_PLUS or game_code != "SDEZ"
)
):
self.logger.error(
"Unencrypted v%s %s request, but config is set to encrypted only: %r",
@@ -416,9 +450,9 @@ class Mai2Servlet(BaseServlet):
endpoint = (
endpoint.replace("MaimaiExp", "")
if game_code == Mai2Constants.GAME_CODE_DX_INT
if game_code == Mai2Constants.GAME_CODE_DX_INT and version >= 120
else endpoint.replace("MaimaiChn", "")
if game_code == Mai2Constants.GAME_CODE_DX_CHN
if game_code == Mai2Constants.GAME_CODE_DX_CHN and version >= 120
else endpoint
)
func_to_find = "handle_" + inflection.underscore(endpoint) + "_request"
@@ -444,15 +478,17 @@ class Mai2Servlet(BaseServlet):
zipped = zlib.compress(json.dumps(resp, ensure_ascii=False).encode("utf-8"))
if not encrypted or version < 110:
if not encrypted or (
internal_ver < Mai2Constants.VER_MAIMAI_DX_PLUS and game_code == "SDEZ"
):
return Response(zipped)
padded = pad(zipped, 16)
crypt = AES.new(
bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][0]),
bytes.fromhex(self.game_cfg.crypto.keys[crypto_cfg_key][0]),
AES.MODE_CBC,
bytes.fromhex(self.game_cfg.crypto.keys[internal_ver][1]),
bytes.fromhex(self.game_cfg.crypto.keys[crypto_cfg_key][1]),
)
return Response(crypt.encrypt(padded))