feat(huya): 证书算法完全闭环 - 差分法证明标准AES-128-ECB并复现铸证
- NativeFunction直调差分: FIPS-197 KAT逐位一致, UdbAESUtil无魔改 - 证书 = b64([0x0C][key_idx][AES128-ECB(key16, zeropad(P1_187B))]) - P1结构: [010400][5008][u16+20B随机][u16+40B指纹hex][u16+114B hyCred] - 密钥: rodata默认三条(AESkeyMgr id=3/4/5) + 服务端下发会话钥(key_idx区分) - tools/cert_forge.py 重铸证书与活体密文 FULL MATCH
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#!/usr/bin/env python3
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"""UdbAESUtil 差分分析 harness（NativeFunction 直调）。
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时序（不可变）: force-stop -> spawn挂起 -> bypass -> resume -> 稳定10s -> patch_guard -> 业务脚本
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静态已确认对象布局: +0x00 vptr | +0x08 S-box拷贝(256B) | +0x108 InvS-box拷贝(256B) | +0x208 轮密钥(176B)
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导出符号（.dynsym）:
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C1(uchar*key) 0x24eb08 构造器
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KeyExpansion 0x24ebd4
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Cipher(uchar*) 0x24f314 10轮
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InvCipher(uchar*) 0x24f778
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_encrypt(uchar*,string&) 0x24f9f0
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_decrypt 0x24fe90
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encrypt(ret&,key?,in?) 0x250038
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decrypt 0x2501a4
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"""
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from __future__ import annotations
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import json
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import subprocess
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import time
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from pathlib import Path
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import frida
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RE = Path("/Users/yml/codes/Reverse-Engineering-Agent-Universal-v3.0")
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JS = r"""
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'use strict';
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// 段错误防护: 拦截 native 崩溃, 上报后恢复而不是带崩进程
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Process.setExceptionHandler(function(det){
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send({type:'segv', info:{type:det.type, addr:String(det.address), msg:String(det.memory||'')}});
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return true;
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});
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var MOD = 'libudbauthunify.so';
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var base = Process.getModuleByName(MOD).base;
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send({type:'armed', base:String(base)});
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var A = {
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C1: new NativeFunction(base.add(0x24eb08), 'void', ['pointer','pointer']),
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Cipher: new NativeFunction(base.add(0x24f314), 'void', ['pointer','pointer']),
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InvCipher: new NativeFunction(base.add(0x24f778), 'void', ['pointer','pointer']),
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enc_pub: new NativeFunction(base.add(0x250038), 'pointer', ['pointer','pointer','pointer']),
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dec_pub: new NativeFunction(base.add(0x2501a4), 'pointer', ['pointer','pointer','pointer']),
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};
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function hex(p,n){ return Array.from(new Uint8Array(p.readByteArray(n))).map(x=>('0'+x.toString(16)).slice(-2)).join(''); }
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function unhex(s){ var n=s.length>>1, b=new Uint8Array(n); for(var i=0;i<n;i++) b[i]=parseInt(s.substr(i*2,2),16); return b; }
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function wrBytes(p, arr){ p.writeByteArray(arr); }
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// libc++ std::string 构造 (老布局: cap@0|flagLSB, size@8, data@16 / SSO: b0=len<<1,data@1)
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function mkstr(bytes){
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var m = Memory.alloc(32);
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var n = bytes.length;
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if (n <= 22) {
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Memory.writeByteArray(m, new Array(24).fill(0));
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m.writeU8(n<<1);
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if(n) wrBytes(m.add(1), bytes);
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} else {
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var buf = Memory.alloc(n+1);
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wrBytes(buf, bytes); buf.add(n).writeU8(0);
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m.writeU64( uint64(((n)<<1)|1) );
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m.add(8).writeU64(uint64(n));
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m.add(16).writePointer(buf);
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}
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return m;
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}
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function strBytes(sp){ // 读回 std::string 内容
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var b0=sp.readU8();
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if((b0&1)===0){ var l=b0>>1; return l? new Uint8Array(sp.add(1).readByteArray(l)) : new Uint8Array(0); }
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var len=parseInt(sp.add(8).readU64().toString());
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var dp=sp.add(16).readPointer();
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return len? new Uint8Array(dp.readByteArray(len)) : new Uint8Array(0);
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}
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var OBJLEN = 0x300;
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function newObj(){ return Memory.alloc(OBJLEN); }
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rpc.exports = {
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// 轮密钥展开对拍
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sched: function(keyHex){
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var o=newObj(), k=Memory.alloc(32);
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wrBytes(k, unhex(keyHex));
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A.C1(o, k);
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return { rk: hex(o.add(0x208), 176), sbox_head: hex(o.add(8),16) };
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},
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// 单块 Cipher（读改前后，判断是否就地）
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cipher: function(keyHex, blkHex){
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var o=newObj(), k=Memory.alloc(32), b=Memory.alloc(48);
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wrBytes(k, unhex(keyHex)); wrBytes(b, unhex(blkHex));
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A.C1(o,k);
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var before = hex(b,16);
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A.Cipher(o,b);
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return { before:before, after:hex(b,16) };
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},
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invcipher: function(keyHex, ctHex){
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var o=newObj(), k=Memory.alloc(32), b=Memory.alloc(48);
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wrBytes(k, unhex(keyHex)); wrBytes(b, unhex(ctHex));
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A.C1(o,k);
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A.InvCipher(o,b);
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return { after: hex(b,16) };
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},
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// 公开 encrypt(ret,this=x1,x2) —— 按静态结论: static(ret=&ret, x1=&plain, x2=key临时)
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encpub: function(plainHex, keyBytesHex){
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var ret=Memory.alloc(32), plain=mkstr(unhex(plainHex)), key=mkstr(unhex(keyBytesHex));
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try {
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A.enc_pub(ret, plain, key);
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return { out: hex(strBytes(ret)) };
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} catch(e){ return { err:String(e) }; }
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},
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decpub: function(ctHex, keyBytesHex){
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var ret=Memory.alloc(32), ct=mkstr(unhex(ctHex)), key=mkstr(unhex(keyBytesHex));
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try {
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A.dec_pub(ret, ct, key);
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return { out: hex(strBytes(ret)) };
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} catch(e){ return { err:String(e) }; }
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},
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ping: function(){ return 'pong'; }
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};
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"""
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def main():
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d = frida.get_device_manager().add_remote_device('127.0.0.1:31877')
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pid = d.spawn(['com.duowan.kiwi'])
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print(f'spawned {pid}')
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s = d.attach(pid)
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# 双重防护(与 hook_final_capture 完全一致): callsite bypass + maps 掩盖
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s.create_script((RE / "evidence/scripts/bypass_msaoaid_maps_art_callsite.js").read_text()).load()
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s.create_script((RE / "evidence/scripts/mask_frida_maps_only.js").read_text()).load()
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d.resume(pid)
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print('resumed')
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time.sleep(11)
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s.create_script((RE / "evidence/scripts/patch_guard_block_termination.js").read_text()).load()
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print('patch_guard on')
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sc = s.create_script(JS)
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state = {'armed': False, 'segv': 0}
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OUT = Path('/Users/yml/codes/douyu_login_py/evidence/aes_diff.json')
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def save(k, v):
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try:
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data = json.loads(OUT.read_text()) if OUT.exists() else {}
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except Exception:
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data = {}
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data[k] = v
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OUT.write_text(json.dumps(data, indent=1))
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def on_msg(m, _):
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if m.get('type') == 'error':
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print('JS ERR:', str(m)[:300])
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elif m.get('type') == 'send':
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p = m.get('payload') or {}
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if p.get('type') == 'armed':
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state['armed'] = True
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print('[armed]', p['base'])
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elif p.get('type') == 'segv':
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state['segv'] += 1
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print(f"[SEGV #{state['segv']}] {p['info']}")
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sc.on('message', on_msg)
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sc.load()
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assert state['armed']
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print('ping:', sc.exports.ping())
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k16 = '000102030405060708090a0b0c0d0e0f'
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KEY27 = 'HuyaUdb1928374650qwertyuiop'.encode().hex()
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# ---- 阶段1: KeyExpansion 轮密钥对拍 ----
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r = sc.exports.sched(k16)
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save('sched_kat', r); print('[sched] rk[:32]', r['rk'][:32])
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# ---- 阶段2: 单块 Cipher KAT ----
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r = sc.exports.cipher(k16, '00112233445566778899aabbccddeeff')
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save('cipher_kat', r)
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std = '69c4e0d86a7b0430d8cdb78070b4c55a'
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ok = r.get('after') == std
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print(f'[cipher KAT] {r.get("after")} 标准FIPS-197={std} match={ok}')
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if not ok:
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print('!! 与标准不一致 -> 自定义点在轮结构/密钥扩展, 后续阶段仍执行')
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# ---- 阶段3: HuyaUdb 主密钥 first16 差分 ----
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r = sc.exports.cipher(KEY27.encode().hex()[:32], '00' * 16)
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save('cipher_huyaudb_first16', r); print('[cipher first16(HuyaUdb)]', r)
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# ---- 阶段4: InvCipher 往返 ----
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ct = sc.exports.cipher(k16, 'cafebabe' * 4).get('after', '')
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pt = sc.exports.invcipher(k16, ct).get('after', '') if ct else ''
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print(f'[inv roundtrip] ct={ct[:32]} -> pt={pt} match={pt == "cafebabe" * 4}')
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save('inv_roundtrip', {'ct': ct, 'pt': pt})
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# ---- 阶段5: 公开 encrypt(最可能崩, 放最后) ----
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for name, pt in [('empty', ''), ('15B', 'aa' * 15), ('16B', 'bb' * 16), ('187B', 'cc' * 187)]:
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try:
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r = sc.exports.encpub(pt, KEY27)
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o = r.get('out', '')
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print(f'[encpub {name}] -> {len(o)//2}B head={o[:48]}')
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save(f'encpub_{name}', r)
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except Exception as e:
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print(f'[encpub {name}] EXC {e}')
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try:
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e = sc.exports.encpub('ab' * 40, KEY27)
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dd = sc.exports.decpub(e.get('out', ''), KEY27)
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print(f'[roundtrip 80B] ct={len(e.get("out",""))//2}B pt_ok={dd.get("out","").startswith("ab"*16)}')
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save('roundtrip80', {'e': e, 'd': dd})
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except Exception as ex:
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print('[roundtrip] EXC', ex)
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print('done, segv count:', state['segv'])
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if __name__ == '__main__':
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for attempt in range(4):
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print(f'===== 尝试 #{attempt+1} =====')
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try:
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main()
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break
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except frida.InvalidOperationError as e:
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print(f'session detached: {e}')
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subprocess.run(['adb', 'shell', 'am', 'force-stop', 'com.duowan.kiwi'])
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time.sleep(3)
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except Exception as e:
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print(f'err: {e}')
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time.sleep(3)
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