38 lines
1.1 KiB
Python
38 lines
1.1 KiB
Python
"""`sig` and related MD5 helpers."""
|
||
|
||
from __future__ import annotations
|
||
|
||
import hashlib
|
||
|
||
|
||
# libcore.so 解码出的静态 app salt，同 app 版本固定。
|
||
SIG_SALT = "772867c19925"
|
||
|
||
|
||
def build_sig_plaintext(params: dict) -> bytes:
|
||
"""构造 sig 明文。
|
||
|
||
参数集是请求的全部非签名参数。FormBody 请求会把 body 参数一起纳入
|
||
URL `sig`；业务字段 `sign` 不属于 URL 签名参数，必须保留参与拼接。
|
||
"""
|
||
skip = {"sig", "sig2"}
|
||
parts = []
|
||
for key in sorted(params.keys()):
|
||
if key in skip or key.startswith("__NS"):
|
||
continue
|
||
parts.append(f"{key}={params[key]}")
|
||
return "".join(parts).encode("utf-8")
|
||
|
||
|
||
def sig(params: dict, salt: str = SIG_SALT) -> str:
|
||
"""`sig = MD5(build_sig_plaintext(params) + salt)`."""
|
||
return hashlib.md5(build_sig_plaintext(params) + salt.encode()).hexdigest()
|
||
|
||
|
||
def body_md5(body: bytes) -> str:
|
||
"""`bodyMd5 = MD5(body)`，用于 `sig2` 输入。"""
|
||
return hashlib.md5(body).hexdigest()
|
||
|
||
|
||
__all__ = ["SIG_SALT", "body_md5", "build_sig_plaintext", "sig"]
|