京东app秒杀接口sk参数分析

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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[]) {switch (N[O++]) {case '0':var P = E['createElem' + bw(0x15a)](bw(0x15b));continue;case '1':if (c[bw(0x125)](typeof L, c['dyrQs'])) return ![];continue;case '2':R['removeChil' + 'd'](P);continue;case '3':var Q = 'illidan' + c[bw(0x167)](new Date(), 0x0);continue;case '4':var R = E['getElement' + bw(0x177)](c[bw(0x20b)])[0x0];continue;case '5':return c[bw(0x1d4)](D[Q], L[Q]);case '6':P[bw(0x190)] = c[bw(0xdd)](Q, c[bw(0xaf)]);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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