京东app秒杀接口sk参数分析
京东app秒杀接口里面的sk参数分析学习。
·
仅供学习交流。
京东app秒杀接口里面的sk参数分析学习，该参数找了好久，不是app生成的，是js里面生成的。
如图：
第一步如图：提交订单时返回了一段html，里面存在一段js代码。如下图：
js内容很简单，其实就是拼接一个url并发送请求，然后将其添加到script代码块，渲染的时候自动执行。_tak的值即为sk的值，计算失败的情况下还给了默认值。
拼接的url：https://tak.jd.com/a/tr.js?_t=2708376
js源码如下：
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function Q() {
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O[ay(0xcd)](N[ay(0x21c)], N['url'], N[ay(0x1a2)]), O['withCreden' + ay(0x127)] = !! [], O['setRequest' + ay(0xec)](c[ay(0xf5)], N['contentTyp' + 'e']);
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c[b7(0xd0)](f, function() {
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O = M[0x1],
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function S() {
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R['removeChil' + 'd'](P);
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var R = E['getElement' + bw(0x177)](c[bw(0x20b)])[0x0];
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continue;
case '7':
R[bw(0x15c) + 're'](P, R[bw(0x196)]);
continue;
}
break;
}
}
} catch (T) {
if (c['kbOMB'] === c[bw(0x11e)]) return ![];
else {
function U() {
var by = bw;
return M['ghrEK'](E, by(0x221) + by(0x114));
}
}
} else {
function V() {
return E;
}
}
}
function H(L) {
var bA = a8,
M = {
'YyVMi': c['QmPmh'],
'gwpfX': function(N, O) {
var bz = b;
return c[bz(0xdd)](N, O);
},
'QIlwE': c[bA(0x12e)],
'KsSpD': c[bA(0x20b)],
'yVmxl': c['BtBiE'],
'mlBgU': function(N, O) {
return c['gklzl'](N, O);
},
'VBdRO': function(N, O) {
var bB = bA;
return c[bB(0x125)](N, O);
},
'wcCpn': c['dyrQs'],
'EeVKq': function(N, O) {
return N + O;
}
};
if (c[bA(0xcf)](bA(0x172), c['ksdnx'])) {
try {
if (c['jwuPA'](c['SrqzX'], bA(0xd5))) return JSON['parse'](L);
else {
function N() {
var bC = bA,
O = f[bC(0x1ec) + bC(0x15a)](M[bC(0xfb)]);
O[bC(0x21c)] = bC(0x147) + bC(0x224), O[bC(0x1a2)] = !! [], O[bC(0x1b6)] = M['gwpfX'](g, '');
var P = h[bC(0xc1) + 'sByTagName'](M[bC(0xfb)])[0x0];
P[bC(0x102)][bC(0x15c) + 're'](O, P);
}
}
} catch (O) {}
return {};
} else {
function P() {
var bD = bA,
Q = M['QIlwE']['split']('|'),
R = 0x0;
while ( !! []) {
switch (Q[R++]) {
case '0':
var S = U[bD(0xc1) + bD(0x177)](M[bD(0x13e)])[0x0];
continue;
case '1':
var T = M[bD(0xc0)](M[bD(0x1c2)], M[bD(0x128)](new h(), 0x0));
continue;
case '2':
var U = U[bD(0x1ec) + bD(0x15a)](M[bD(0xfb)]);
continue;
case '3':
S[bD(0x21f) + 'd'](U);
continue;
case '4':
S[bD(0x15c) + 're'](U, S['firstChild']);
continue;
case '5':
if (M[bD(0xb8)](typeof g, M[bD(0x13c)])) return ![];
continue;
case '6':
return i[T] === j[T];
case '7':
U[bD(0x190)] = M['EeVKq'](T, bD(0x1a5));
continue;
}
break;
}
}
}
}
function I(L) {
var bE = a8;
if (bE(0x1f0) !== c[bE(0x16f)]) {
function M() {
var bF = bE;
l[m] = c[bF(0x135)](n[o], p) ? q[r] : s[t];
}
} else return J(h), L ? L : c[bE(0xf0)](k, c[bE(0x107)]);
}
function J(L) {
var bH = a8,
M = {
'uABQI': function(S, T, U) {
return S(T, U);
},
'NWFDK': function(S) {
var bG = b;
return c[bG(0x194)](S);
}
};
if (c[bH(0xcf)](c[bH(0x231)], c[bH(0x1d2)])) {
function S() {
var bI = bH,
T = {
'VFCSY': function(U) {
return U();
}
};
j(), k[bI(0x220)] = function() {
var bJ = bI;
return M[bJ(0x1b9)](q, function() {
var bK = bJ;
T[bK(0x11d)](v);
}, 0x64), s ? t : M[bJ(0x20a)](u);
};
}
} else {
var N = c[bH(0x11c)][bH(0xac)]('|'),
O = 0x0;
while ( !! []) {
switch (N[O++]) {
case '0':
Q[bH(0x21f) + 'd'](P);
continue;
case '1':
P['text'] = R + c[bH(0xaf)];
continue;
case '2':
Q['insertBefo' + 're'](P, Q[bH(0x196)]);
continue;
case '3':
if (c['eOUsd'](typeof L, bH(0x1eb))) return c[bH(0xf0)](k, c[bH(0xe6)]);
continue;
case '4':
var P = E[bH(0x1ec) + 'ent'](c[bH(0xbe)]);
continue;
case '5':
var Q = E['getElement' + bH(0x177)](c['HiusG'])[0x0];
continue;
case '6':
var R = c['BtBiE'] + c['BoXDv'](new Date(), 0x0);
continue;
case '7':
return c[bH(0xf0)](k, c[bH(0x148)]);
case '8':
if (c['jwuPA'](D[R], L[R])) return;
continue;
}
break;
}
}
}
var K = function() {
var bN = a8,
L = {
'UQFef': function(O, P) {
var bL = b;
return c[bL(0x106)](O, P);
},
'AeaHV': function(O, P) {
var bM = b;
return c[bM(0x187)](O, P);
},
'tdDpF': function(O, P) {
return O === P;
},
'HsOFd': c[bN(0x10f)],
'HXDJt': bN(0xa3),
'VVkJk': function(O, P) {
var bO = bN;
return c[bO(0x106)](O, P);
},
'JKPKa': function(O, P) {
return c['Rnhax'](O, P);
},
'aYlEO': c[bN(0x145)],
'sYcXK': bN(0x19c),
'dEGce': function(O, P) {
var bP = bN;
return c[bP(0x106)](O, P);
},
'kjCTH': function(O, P) {
return O + P;
}
};
if (c[bN(0xc6)](bN(0x213), c[bN(0x21e)])) {
var M = '';
try {
var N = {};
N[bN(0x118)] = c[bN(0x159)](c[bN(0x159)](c['qWSmj'](I, e), c[bN(0x202)]), new Date()[bN(0xbc)]()), N[c[bN(0x140)]] = ![], N[c[bN(0x182)]] = 0x12c, N[c['ErWLj']] = function(O) {
var bQ = bN;
if (L[bQ(0x1fc)](L['HsOFd'], bQ(0x105))) try {
if (bQ(0x1e4) === L[bQ(0x19d)]) {
function R() {
return E;
}
} else {
O = L[bQ(0x173)](H, O);
if (I(O) && L['VVkJk'](I, O[bQ(0x137)])) {
var P = [];
for (var Q in O['data']) {
if (L['JKPKa'](L[bQ(0x136)], L[bQ(0x1f8)])) P['push'](L[bQ(0xb6)](I, O[bQ(0x137)][Q]));
else {
function S() {
var bR = bQ,
T = L[bR(0x173)](h, i[bR(0x1f1)]);
j = L[bR(0x1aa)](L[bR(0x1aa)](k, l[bR(0x11f)](T)), T);
}
}
}
M = L['dEGce'](I, F[bQ(0x13d)](this, P));
}
}
} catch (T) {} else {
function U() {
f(g), h = null;
}
}
}, c[bN(0x179)](u, c[bN(0x1f2)](I, N));
} catch (O) {}
if (!M) {
if (c[bN(0xb7)](c[bN(0x17a)], c['iJKoq'])) M = C();
else {
function P() {
var bS = bN;
return c[bS(0x1d1)](f, g) != h;
}
}
}
return I(M);
} else {
function Q() {
var bT = bN;
g += L[bT(0x1aa)](L[bT(0x1b2)](h, '='), i[j]) + '&';
}
}
};
if (o()) c[a8(0x194)](K), _tak['getTakId'] = function() {
var bU = a8;
return c[bU(0x175)](g, function() {
var bV = bU;
if (c['OEDlw'](c[bV(0x1cb)], c[bV(0x1cb)])) c[bV(0x194)](K);
else {
function L() {
e = f();
}
}
}, 0x64), r ? r : c[bU(0x194)](C);
};
else {
if (c[a8(0xee)] !== c[a8(0x1a3)]) _tak[a8(0x220)] = K;
else {
function L() {
return ![];
}
}
}
}();
} catch (a2) {}去混淆还算比较简单，代码中全局搜索 _tak，定位_tak位置和处理的函数，然后配合node去混淆逐步调试，很容易定位到计算函数。
函数计算所需要的参数 是发送的一个请求的响应结果，如下图：
data：
{
"code": "000000",
"message": "success",
"data": {
"@t": "ch",
"f": "aVW4UtojPQIkuRe1u2vu",
"H": "zrN0J0XvVko1o1KbU2O5",
"VJS": "zhQC8Cuoazpmy5qKVMuv",
"jsx": "VT7rHZvIxG2kHau51qHL",
"cgC": "eN0OsY8WfPwABhqW7d45"
}
}还原结果：
结论：
1. js定位
2. js混淆还原
3. js还原后，根据输入数据的不同，有8种不同的加密情况。
以上仅供学习交流使用，只记录定位过程，不涉及还原过程和核心算法。
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