js逆向，参数加密js混淆

关键词

JS 混淆、源码乱码、参数动态加密

逆向目标

题目1：抓取所有（5页）机票的价格，并计算所有机票价格的平均值，填入答案。

目标网址：https://match.yuanrenxue.cn/match/1
目标接口：https://match.yuanrenxue.cn/api/match/1?page=2&m=9a7e61f783bc3f037aa3f64e05292493%E4%B8%A81708507581
加密参数：m

逆向过程

解决无限debug

打开 F12 刷新页面，傻眼了。页面无法继续下翻…

陷入了无限debug!!

解决：Never pause here 不在此处下断

在debugger位置，点击行号，右键Never pause here，永远不在此处断下，然后重新刷新就可以过这第一个小坑。

抓包分析

接着我们需要找到目标url。

上下翻页，我们很快能够找到具体数据响应的接口。

请求详情：

响应：

参数page无需多言，关键是有个不知道哪里冒出来的参数m？

将curl命令转换为Python、JavaScript等: https://curlconverter.com/

此时，如果我们构造requests请求，并不带上m查询参数，执行会发现响应结果为：

{'error': 'token failed'}

接下来就是要分析下这个m是怎么带上的？

调用堆栈

很容易猜想后半部分大概率是一个时间戳，前半部分是被加密的字符串，中间用中文的|连接。

由于params参数是封装到请求体中发到服务器的，所以，参数m的生成必然是在请求前，因此可以直接来到请求时的这个栈中进行查看调试。

在点进去显示的那一行打断点刷新调试一下，会发现在_0xb89747已经是加密完成的参数，肯定加密过程是在这之前完成的。

所以往回找，先根据_0xb89747看看是从哪里来的，发现是:

var _0xb89747 = _0x5d83a3;

同理再往回找_0x5d83a3从哪里来，发现_0x5d83a3是定义的对象，然后往里面塞了什么东西进去组成的:

const _0x5d83a3 = {};
_0x5d83a3['\x70\x61\x67\x65'] = window['\x70\x61\x67\x65'],
_0x5d83a3['\x6d'] = _0x57feae + '\u4e28' + _0x2268f9 / (-1 * 3483 + -9059 + 13542);

根据_0xb89747为{"page": 4, "m": "8d596e76013033e75c3e23015c553c55丨1715257368"}能够得出参数里面m的组成：

_0x57feae就是前半部分被加密完成的东西。
_0x2268f9就是后半部分。

是不是真相快被找到了，再往回找这两个是哪里来的：

var _0x2268f9 = Date['\x70\x61\x72\x73\x65'](new Date()) + (16798545 + -72936737 + 156138192)
, _0x57feae = oo0O0(_0x2268f9['\x74\x6f\x53\x74\x72' + '\x69\x6e\x67']()) + window['\x66'];

在线网站解混淆

通过堆栈跟中，我们已经找到m参数加密入口，但是代码是混淆的，看起来并不那么清晰。

找在线网站，稍微解一下混淆: https://deobfuscator.kuizuo.cn/

function a() {var _0x2268f9 = Date.parse(new Date()) + 100000000;var _0x57feae = oo0O0(_0x2268f9.toString()) + window.f;const _0x5d83a3 = {page: window.page,m: _0x57feae + "丨" + _0x2268f9 / 1000};var _0xb89747 = _0x5d83a3;$.ajax({url: window.url,dataType: "json",async: false,data: _0xb89747,type: "GET",beforeSend: function (_0x4c488e) {},success: function (_0x131e59) {_0x131e59 = _0x131e59.data;let _0x354583 = "";let _0x1b89ba = "<div class=\"b-airfly\"><div class=\"e-airfly\"data-reactid=\".1.3.3.2.0.$KN5911.0\"><div class=\"col-trip\"data-reactid=\".1.3.3.2.0.$KN5911.0.0\"><div class=\"s-trip\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0\"><div class=\"col-airline\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.0\"><div class=\"d-air\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.0.0:$0\"><div class=\"air\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.0.0:$0.0\"><span data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.0.0:$0.0.1\">中国联合航空</span></div><div class=\"num\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.0.0:$0.1\"><span class=\"n\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.0.0:$0.1.0\">KN5911</span><span class=\"n\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.0.0:$0.1.1\">波音737(中)</span><noscript data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.0.0:$0.1.2\"></noscript></div></div><noscript data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.0.1\"></noscript></div><div class=\"col-time\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1\"><div class=\"sep-lf\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.0\"><h2 data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.0.0\">13:50</h2><p class=\"airport\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.0.1\"><span data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.0.1.0\">大兴国际机场</span><span data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.0.1.1\"></span></p></div><div class=\"sep-ct\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.1\"><div class=\"range\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.1.0\">3小时40分钟</div><div class=\"line\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.1.1\"></div></div><div class=\"sep-rt\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.2\"><noscript data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.2.0\"></noscript><h2 data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.2.1\">17:30</h2><p class=\"airport\"data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.2.2\"><span data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.2.2.0\">宝安机场</span></p></div><noscript data-reactid=\".1.3.3.2.0.$KN5911.0.0.0.1.3\"></noscript></div></div></div><div class=\"col-price\"data-reactid=\".1.3.3.2.0.$KN5911.0.1\"><p class=\"prc\"data-reactid=\".1.3.3.2.0.$KN5911.0.1.0\"><span data-reactid=\".1.3.3.2.0.$KN5911.0.1.0.0\"><i class=\"rmb\"data-reactid=\".1.3.3.2.0.$KN5911.0.1.0.0.0\">&yen;</i><span class=\"fix_price\"data-reactid=\".1.3.3.2.0.$KN5911.0.1.0.0.1\"><span class=\"prc_wp\"style=\"width:48px\">price_sole</span></span></span></p><div class=\"vim\"data-reactid=\".1.3.3.2.0.$KN5911.0.1.1\"><span class=\"v dis\"data-reactid=\".1.3.3.2.0.$KN5911.0.1.1.$0\"></span></div></div><div class=\"col-fold\"data-reactid=\".1.3.3.2.0.$KN5911.0.2\"><p class=\"fd\"data-reactid=\".1.3.3.2.0.$KN5911.0.2.0\">收起</p></div></div><noscript data-reactid=\".1.3.3.2.0.$KN5911.1\"></noscript></div>";let _0x548377 = ["中国南方航空", "吉祥航空", "奥凯航空", "九元航空", "长龙航空", "东方航空", "中国国际航空", "深圳航空", "海南航空", "春秋航空", "上海航空", "西部航空", "重庆航空", "西藏航空", "中国联合航空", "云南祥鹏航空", "云南英安航空", "厦门航空", "天津航空", "山东航空", "四川航空", "华夏航空", "长城航空", "成都航空有", "北京首都航空", "中华航空", "意大利国家航空公司", "印度百捷航空", "越南航空", "远东航空", "印度航空公司", "印度捷特航空有限公司", "以色列航空公司", "意大利航空", "伊朗航空公司", "印度尼西亚鹰航空公司", "英国航空公司", "西方天空航空", "西捷航空", "西班牙欧洲航空公司", "西班牙航空公司", "中国南方航空", "吉祥航空", "奥凯航空", "九元航空", "长龙航空", "东方航空", "中国国际航空", "深圳航空", "海南航空", "春秋航空", "上海航空", "西部航空", "重庆航空", "西藏航空", "中国联合航空", "云南祥鹏航空", "云南英安航空", "厦门航空", "天津航空", "山东航空", "四川航空", "华夏航空", "长城航空", "成都航空有", "北京首都航空", "中华航空", "意大利国家航空公司", "印度百捷航空", "越南航空", "远东航空", "印度航空公司", "印度捷特航空有限公司", "以色列航空公司", "意大利航空", "伊朗航空公司", "印度尼西亚鹰航空公司", "英国航空公司", "西方天空航空", "西捷航空", "西班牙欧洲航空公司", "西班牙航空公司"];let _0x5286d2 = 1;let _0xa24ff9 = ["北京首都国际机场", "上海虹桥国际机场", "上海浦东国际机场", "天津滨海国际机场", "太原武宿机场", "呼和浩特白塔机场", "沈阳桃仙国际机场", "大连周水子国际机场", "长春大房身机场", "哈尔滨阎家岗国际机场", "齐齐哈尔三家子机场", "佳木斯东郊机场", "厦门高崎国际机场", "福州长乐国际机场", "杭州萧山国际机场", "合肥骆岗机场", "宁波栎社机场", "南京禄口国际机场", "广州白云国际机场", "深圳宝安国际机场", "长沙黄花机场", "海口美亚机场", "武汉天河机场", "济南遥墙机场", "青岛流亭机场", "南宁吴墟机场", "三亚凤凰国际机场", "重庆江北国际机场", "成都双流国际机场", "昆明巫家坝国际机场", "昆明长水国际机场", "桂林两江国际机场", "西安咸阳国际机场", "兰州中川机场", "贵阳龙洞堡机场", "拉萨贡嘎机场", "乌鲁木齐地窝堡机场", "南昌向塘机场", "郑州新郑机场", "北京首都国际机场", "上海虹桥国际机场", "上海浦东国际机场", "天津滨海国际机场", "太原武宿机场", "呼和浩特白塔机场", "沈阳桃仙国际机场", "大连周水子国际机场", "长春大房身机场", "哈尔滨阎家岗国际机场", "齐齐哈尔三家子机场", "佳木斯东郊机场", "厦门高崎国际机场", "福州长乐国际机场", "杭州萧山国际机场", "合肥骆岗机场", "宁波栎社机场", "南京禄口国际机场", "广州白云国际机场", "深圳宝安国际机场", "长沙黄花机场", "海口美亚机场", "武汉天河机场", "济南遥墙机场", "青岛流亭机场", "南宁吴墟机场", "三亚凤凰国际机场", "重庆江北国际机场", "成都双流国际机场", "昆明巫家坝国际机场", "昆明长水国际机场", "桂林两江国际机场", "西安咸阳国际机场", "兰州中川机场", "贵阳龙洞堡机场", "拉萨贡嘎机场", "乌鲁木齐地窝堡机场", "南昌向塘机场", "郑州新郑机场"];if (window.page) {} else {window.page = 1;}$.each(_0x131e59, function (_0x282f1d, _0x4e0853) {_0x354583 += _0x1b89ba.replace("price_sole", _0x4e0853.value).replace("中国联合航空", _0x548377[_0x5286d2 * window.page]).replace("大兴国际", _0xa24ff9[parseInt(_0x5286d2 * window.page / 2) + 1]).replace("宝安机场", _0xa24ff9[_0xa24ff9.length - parseInt(_0x5286d2 * window.page / 2) - 1]);_0x5286d2 += 1;});$(".m-airfly-lst").text("").append(_0x354583);},complete: function () {},error: function () {alert("数据拉取失败。可能是触发了风控系统，若您是正常访问，请使用谷歌浏览器无痕模式，并且校准电脑的系统时间重新尝试");alert("生而为虫，我很抱歉，请刷新页面，查看问题是否存在");$(".page-message").eq(0).addClass("active");$(".page-message").removeClass("active");}});
}

通过解混淆后的 JS 代码也是进一步验证了我们跟踪堆栈的正确性。

我们可以看到m字符串是通过oo0O0()函数 + window.f + ‘|’ + 时间处理构成的，接下来我们来找oo0O0()这个函数。

跟栈找到oo0O0()函数的定义：

抠出function oo0O0(mw)函数，使用在线 HTML 美化工具美化。

HTML 美化代码工具分析: https://beautifier.io/

function oo0O0(mw)
{window.b = '';for (var i = 0, len = window.a.length; i < len; i++){console.log(window.a[i]);window.b += String[document.e + document.g](window.a[i][document.f +document.h]() - i - window.c)}var U = ['W5r5W6VdIHZcT8kU', 'WQ8CWRaxWQirAW=='];var J = function (o, E){o = o - 0x0;var N = U[o];if (J['bSSGte'] === undefined){var Y = function (w){var m ='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/=',T = String(w)['replace'](/=+$/, '');var A = '';for (var C = 0x0, b, W, l = 0x0; W = T['charAt'](l++); ~W && (b = C % 0x4 ? b * 0x40 + W : W, C++ % 0x4) ?A += String['fromCharCode'](0xff & b >> (-0x2 * C &0x6)) : 0x0){W = m['indexOf'](W)}return A};var t = function (w, m){var T = [],A = 0x0,C, b = '',W = '';w = Y(w);for (var R = 0x0, v = w['length']; R < v; R++){W += '%' + ('00' + w['charCodeAt'](R)['toString'](0x10))['slice'](-0x2)}w = decodeURIComponent(W);var l;for (l = 0x0; l < 0x100; l++){T[l] = l}for (l = 0x0; l < 0x100; l++){A = (A + T[l] + m['charCodeAt'](l % m['length'])) %0x100, C = T[l], T[l] = T[A], T[A] = C}l = 0x0, A = 0x0;for (var L = 0x0; L < w['length']; L++){l = (l + 0x1) % 0x100, A = (A + T[l]) % 0x100, C =T[l], T[l] = T[A], T[A] = C, b += String['fromCharCode'](w['charCodeAt'](L) ^ T[(T[l] + T[A]) % 0x100])}return b};J['luAabU'] = t, J['qlVPZg'] = {}, J['bSSGte'] = !![]}var H = J['qlVPZg'][o];return H === undefined ? (J['TUDBIJ'] === undefined && (J['TUDBIJ'] = !![]), N = J['luAabU'](N, E), J['qlVPZg'][o] = N) : N = H, N};eval(atob(window['b'])[J('0x0', ']dQW')](J('0x1', 'GTu!'), '\x27' + mw +'\x27'));return ''
}

这里我们会发现，oo0O0()这个函数只是执行了eval，而函数本身返回空值""。

优秀啊，年轻人真是会玩！

接下来分析这条代码：

> atob(window['b'])
> 'var hexcase=0;var b64pad="";var chrsz=16;function hex_md5(a){return binl2hex(core_md5(str2binl(a),a.length*chrsz))}function b64_md5(a){return binl2b64(core_md5(str2binl(a),a.length*chrsz))}function str_md5(a){return binl2str(core_md5(str2binl(a),a.length*chrsz))}function hex_hmac_md5(a,b){return binl2hex(core_hmac_md5(a,b))}function b64_hmac_md5(a,b){return binl2b64(core_hmac_md5(a,b))}function str_hmac_md5(a,b){return binl2str(core_hmac_md5(a,b))}function md5_vm_test(){return hex_md5("abc")=="900150983cd24fb0d6963f7d28e17f72"}function core_md5(p,k){p[k>>5]|=128<<((k)%32);p[(((k+64)>>>9)<<4)+14]=k;var o=1732584193;var n=-271733879;var m=-1732584194;var l=271733878;for(var g=0;g<p.length;g+=16){var j=o;var h=n;var f=m;var e=l;o=md5_ff(o,n,m,l,p[g+0],7,-680976936);l=md5_ff(l,o,n,m,p[g+1],12,-389564586);m=md5_ff(m,l,o,n,p[g+2],17,606105819);n=md5_ff(n,m,l,o,p[g+3],22,-1044525330);o=md5_ff(o,n,m,l,p[g+4],7,-176418897);l=md5_ff(l,o,n,m,p[g+5],12,1200080426);m=md5_ff(m,l,o,n,p[g+6],17,-1473231341);n=md5_ff(n,m,l,o,p[g+7],22,-45705983);o=md5_ff(o,n,m,l,p[g+8],7,1770035416);l=md5_ff(l,o,n,m,p[g+9],12,-1958414417);m=md5_ff(m,l,o,n,p[g+10],17,-42063);n=md5_ff(n,m,l,o,p[g+11],22,-1990404162);o=md5_ff(o,n,m,l,p[g+12],7,1804660682);l=md5_ff(l,o,n,m,p[g+13],12,-40341101);m=md5_ff(m,l,o,n,p[g+14],17,-1502002290);n=md5_ff(n,m,l,o,p[g+15],22,1236535329);o=md5_gg(o,n,m,l,p[g+1],5,-165796510);l=md5_gg(l,o,n,m,p[g+6],9,-1069501632);m=md5_gg(m,l,o,n,p[g+11],14,643717713);n=md5_gg(n,m,l,o,p[g+0],20,-373897302);o=md5_gg(o,n,m,l,p[g+5],5,-701558691);l=md5_gg(l,o,n,m,p[g+10],9,38016083);m=md5_gg(m,l,o,n,p[g+15],14,-660478335);n=md5_gg(n,m,l,o,p[g+4],20,-405537848);o=md5_gg(o,n,m,l,p[g+9],5,568446438);l=md5_gg(l,o,n,m,p[g+14],9,-1019803690);m=md5_gg(m,l,o,n,p[g+3],14,-187363961);n=md5_gg(n,m,l,o,p[g+8],20,1163531501);o=md5_gg(o,n,m,l,p[g+13],5,-1444681467);l=md5_gg(l,o,n,m,p[g+2],9,-51403784);m=md5_gg(m,l,o,n,p[g+7],14,1735328473);n=md5_gg(n,m,l,o,p[g+12],20,-1921207734);o=md5_hh(o,n,m,l,p[g+5],4,-378558);l=md5_hh(l,o,n,m,p[g+8],11,-2022574463);m=md5_hh(m,l,o,n,p[g+11],16,1839030562);n=md5_hh(n,m,l,o,p[g+14],23,-35309556);o=md5_hh(o,n,m,l,p[g+1],4,-1530992060);l=md5_hh(l,o,n,m,p[g+4],11,1272893353);m=md5_hh(m,l,o,n,p[g+7],16,-155497632);n=md5_hh(n,m,l,o,p[g+10],23,-1094730640);o=md5_hh(o,n,m,l,p[g+13],4,681279174);l=md5_hh(l,o,n,m,p[g+0],11,-358537222);m=md5_hh(m,l,o,n,p[g+3],16,-722881979);n=md5_hh(n,m,l,o,p[g+6],23,76029189);o=md5_hh(o,n,m,l,p[g+9],4,-640364487);l=md5_hh(l,o,n,m,p[g+12],11,-421815835);m=md5_hh(m,l,o,n,p[g+15],16,530742520);n=md5_hh(n,m,l,o,p[g+2],23,-995338651);o=md5_ii(o,n,m,l,p[g+0],6,-198630844);l=md5_ii(l,o,n,m,p[g+7],10,11261161415);m=md5_ii(m,l,o,n,p[g+14],15,-1416354905);n=md5_ii(n,m,l,o,p[g+5],21,-57434055);o=md5_ii(o,n,m,l,p[g+12],6,1700485571);l=md5_ii(l,o,n,m,p[g+3],10,-1894446606);m=md5_ii(m,l,o,n,p[g+10],15,-1051523);n=md5_ii(n,m,l,o,p[g+1],21,-2054922799);o=md5_ii(o,n,m,l,p[g+8],6,1873313359);l=md5_ii(l,o,n,m,p[g+15],10,-30611744);m=md5_ii(m,l,o,n,p[g+6],15,-1560198380);n=md5_ii(n,m,l,o,p[g+13],21,1309151649);o=md5_ii(o,n,m,l,p[g+4],6,-145523070);l=md5_ii(l,o,n,m,p[g+11],10,-1120210379);m=md5_ii(m,l,o,n,p[g+2],15,718787259);n=md5_ii(n,m,l,o,p[g+9],21,-343485551);o=safe_add(o,j);n=safe_add(n,h);m=safe_add(m,f);l=safe_add(l,e)}return Array(o,n,m,l)}function md5_cmn(h,e,d,c,g,f){return safe_add(bit_rol(safe_add(safe_add(e,h),safe_add(c,f)),g),d)}function md5_ff(g,f,k,j,e,i,h){return md5_cmn((f&k)|((~f)&j),g,f,e,i,h)}function md5_gg(g,f,k,j,e,i,h){return md5_cmn((f&j)|(k&(~j)),g,f,e,i,h)}function md5_hh(g,f,k,j,e,i,h){return md5_cmn(f^k^j,g,f,e,i,h)}function md5_ii(g,f,k,j,e,i,h){return md5_cmn(k^(f|(~j)),g,f,e,i,h)}function core_hmac_md5(c,f){var e=str2binl(c);if(e.length>16){e=core_md5(e,c.length*chrsz)}var a=Array(16),d=Array(16);for(var b=0;b<16;b++){a[b]=e[b]^909522486;d[b]=e[b]^1549556828}var g=core_md5(a.concat(str2binl(f)),512+f.length*chrsz);return core_md5(d.concat(g),512+128)}function safe_add(a,d){var c=(a&65535)+(d&65535);var b=(a>>16)+(d>>16)+(c>>16);return(b<<16)|(c&65535)}function bit_rol(a,b){return(a<<b)|(a>>>(32-b))}function str2binl(d){var c=Array();var a=(1<<chrsz)-1;for(var b=0;b<d.length*chrsz;b+=chrsz){c[b>>5]|=(d.charCodeAt(b/chrsz)&a)<<(b%32)}return c}function binl2str(c){var d="";var a=(1<<chrsz)-1;for(var b=0;b<c.length*32;b+=chrsz){d+=String.fromCharCode((c[b>>5]>>>(b%32))&a)}return d}function binl2hex(c){var b=hexcase?"0123456789ABCDEF":"0123456789abcdef";var d="";for(var a=0;a<c.length*4;a++){d+=b.charAt((c[a>>2]>>((a%4)*8+4))&15)+b.charAt((c[a>>2]>>((a%4)*8))&15)}return d}function binl2b64(d){var c="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var f="";for(var b=0;b<d.length*4;b+=3){var e=(((d[b>>2]>>8*(b%4))&255)<<16)|(((d[b+1>>2]>>8*((b+1)%4))&255)<<8)|((d[b+2>>2]>>8*((b+2)%4))&255);for(var a=0;a<4;a++){if(b*8+a*6>d.length*32){f+=b64pad}else{f+=c.charAt((e>>6*(3-a))&63)}}}return f};window.f = hex_md5(mwqqppz)'

atob()函数是JavaScript中的一个内置函数，用于将base64编码的字符串解码为原始字符串。

使用美化工具(https://beautifier.io/)美化得到下面可读的JavaScript代码：

var hexcase = 0;
var b64pad = "";
var chrsz = 16;function hex_md5(a)
{return binl2hex(core_md5(str2binl(a), a.length * chrsz))
}function b64_md5(a)
{return binl2b64(core_md5(str2binl(a), a.length * chrsz))
}function str_md5(a)
{return binl2str(core_md5(str2binl(a), a.length * chrsz))
}function hex_hmac_md5(a, b)
{return binl2hex(core_hmac_md5(a, b))
}function b64_hmac_md5(a, b)
{return binl2b64(core_hmac_md5(a, b))
}function str_hmac_md5(a, b)
{return binl2str(core_hmac_md5(a, b))
}function md5_vm_test()
{return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72"
}function core_md5(p, k)
{p[k >> 5] |= 128 << ((k) % 32);p[(((k + 64) >>> 9) << 4) + 14] = k;var o = 1732584193;var n = -271733879;var m = -1732584194;var l = 271733878;for (var g = 0; g < p.length; g += 16){var j = o;var h = n;var f = m;var e = l;o = md5_ff(o, n, m, l, p[g + 0], 7, -680976936);l = md5_ff(l, o, n, m, p[g + 1], 12, -389564586);m = md5_ff(m, l, o, n, p[g + 2], 17, 606105819);n = md5_ff(n, m, l, o, p[g + 3], 22, -1044525330);o = md5_ff(o, n, m, l, p[g + 4], 7, -176418897);l = md5_ff(l, o, n, m, p[g + 5], 12, 1200080426);m = md5_ff(m, l, o, n, p[g + 6], 17, -1473231341);n = md5_ff(n, m, l, o, p[g + 7], 22, -45705983);o = md5_ff(o, n, m, l, p[g + 8], 7, 1770035416);l = md5_ff(l, o, n, m, p[g + 9], 12, -1958414417);m = md5_ff(m, l, o, n, p[g + 10], 17, -42063);n = md5_ff(n, m, l, o, p[g + 11], 22, -1990404162);o = md5_ff(o, n, m, l, p[g + 12], 7, 1804660682);l = md5_ff(l, o, n, m, p[g + 13], 12, -40341101);m = md5_ff(m, l, o, n, p[g + 14], 17, -1502002290);n = md5_ff(n, m, l, o, p[g + 15], 22, 1236535329);o = md5_gg(o, n, m, l, p[g + 1], 5, -165796510);l = md5_gg(l, o, n, m, p[g + 6], 9, -1069501632);m = md5_gg(m, l, o, n, p[g + 11], 14, 643717713);n = md5_gg(n, m, l, o, p[g + 0], 20, -373897302);o = md5_gg(o, n, m, l, p[g + 5], 5, -701558691);l = md5_gg(l, o, n, m, p[g + 10], 9, 38016083);m = md5_gg(m, l, o, n, p[g + 15], 14, -660478335);n = md5_gg(n, m, l, o, p[g + 4], 20, -405537848);o = md5_gg(o, n, m, l, p[g + 9], 5, 568446438);l = md5_gg(l, o, n, m, p[g + 14], 9, -1019803690);m = md5_gg(m, l, o, n, p[g + 3], 14, -187363961);n = md5_gg(n, m, l, o, p[g + 8], 20, 1163531501);o = md5_gg(o, n, m, l, p[g + 13], 5, -1444681467);l = md5_gg(l, o, n, m, p[g + 2], 9, -51403784);m = md5_gg(m, l, o, n, p[g + 7], 14, 1735328473);n = md5_gg(n, m, l, o, p[g + 12], 20, -1921207734);o = md5_hh(o, n, m, l, p[g + 5], 4, -378558);l = md5_hh(l, o, n, m, p[g + 8], 11, -2022574463);m = md5_hh(m, l, o, n, p[g + 11], 16, 1839030562);n = md5_hh(n, m, l, o, p[g + 14], 23, -35309556);o = md5_hh(o, n, m, l, p[g + 1], 4, -1530992060);l = md5_hh(l, o, n, m, p[g + 4], 11, 1272893353);m = md5_hh(m, l, o, n, p[g + 7], 16, -155497632);n = md5_hh(n, m, l, o, p[g + 10], 23, -1094730640);o = md5_hh(o, n, m, l, p[g + 13], 4, 681279174);l = md5_hh(l, o, n, m, p[g + 0], 11, -358537222);m = md5_hh(m, l, o, n, p[g + 3], 16, -722881979);n = md5_hh(n, m, l, o, p[g + 6], 23, 76029189);o = md5_hh(o, n, m, l, p[g + 9], 4, -640364487);l = md5_hh(l, o, n, m, p[g + 12], 11, -421815835);m = md5_hh(m, l, o, n, p[g + 15], 16, 530742520);n = md5_hh(n, m, l, o, p[g + 2], 23, -995338651);o = md5_ii(o, n, m, l, p[g + 0], 6, -198630844);l = md5_ii(l, o, n, m, p[g + 7], 10, 11261161415);m = md5_ii(m, l, o, n, p[g + 14], 15, -1416354905);n = md5_ii(n, m, l, o, p[g + 5], 21, -57434055);o = md5_ii(o, n, m, l, p[g + 12], 6, 1700485571);l = md5_ii(l, o, n, m, p[g + 3], 10, -1894446606);m = md5_ii(m, l, o, n, p[g + 10], 15, -1051523);n = md5_ii(n, m, l, o, p[g + 1], 21, -2054922799);o = md5_ii(o, n, m, l, p[g + 8], 6, 1873313359);l = md5_ii(l, o, n, m, p[g + 15], 10, -30611744);m = md5_ii(m, l, o, n, p[g + 6], 15, -1560198380);n = md5_ii(n, m, l, o, p[g + 13], 21, 1309151649);o = md5_ii(o, n, m, l, p[g + 4], 6, -145523070);l = md5_ii(l, o, n, m, p[g + 11], 10, -1120210379);m = md5_ii(m, l, o, n, p[g + 2], 15, 718787259);n = md5_ii(n, m, l, o, p[g + 9], 21, -343485551);o = safe_add(o, j);n = safe_add(n, h);m = safe_add(m, f);l = safe_add(l, e)}return Array(o, n, m, l)
}function md5_cmn(h, e, d, c, g, f)
{return safe_add(bit_rol(safe_add(safe_add(e, h), safe_add(c, f)), g), d)
}function md5_ff(g, f, k, j, e, i, h)
{return md5_cmn((f & k) | ((~f) & j), g, f, e, i, h)
}function md5_gg(g, f, k, j, e, i, h)
{return md5_cmn((f & j) | (k & (~j)), g, f, e, i, h)
}function md5_hh(g, f, k, j, e, i, h)
{return md5_cmn(f ^ k ^ j, g, f, e, i, h)
}function md5_ii(g, f, k, j, e, i, h)
{return md5_cmn(k ^ (f | (~j)), g, f, e, i, h)
}function core_hmac_md5(c, f)
{var e = str2binl(c);if (e.length > 16){e = core_md5(e, c.length * chrsz)}var a = Array(16),d = Array(16);for (var b = 0; b < 16; b++){a[b] = e[b] ^ 909522486;d[b] = e[b] ^ 1549556828}var g = core_md5(a.concat(str2binl(f)), 512 + f.length * chrsz);return core_md5(d.concat(g), 512 + 128)
}function safe_add(a, d)
{var c = (a & 65535) + (d & 65535);var b = (a >> 16) + (d >> 16) + (c >> 16);return (b << 16) | (c & 65535)
}function bit_rol(a, b)
{return (a << b) | (a >>> (32 - b))
}function str2binl(d)
{var c = Array();var a = (1 << chrsz) - 1;for (var b = 0; b < d.length * chrsz; b += chrsz){c[b >> 5] |= (d.charCodeAt(b / chrsz) & a) << (b % 32)}return c
}function binl2str(c)
{var d = "";var a = (1 << chrsz) - 1;for (var b = 0; b < c.length * 32; b += chrsz){d += String.fromCharCode((c[b >> 5] >>> (b % 32)) & a)}return d
}function binl2hex(c)
{var b = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";var d = "";for (var a = 0; a < c.length * 4; a++){d += b.charAt((c[a >> 2] >> ((a % 4) * 8 + 4)) & 15) + b.charAt((c[a >>2] >> ((a % 4) * 8)) & 15)}return d
}function binl2b64(d)
{var c = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var f = "";for (var b = 0; b < d.length * 4; b += 3){var e = (((d[b >> 2] >> 8 * (b % 4)) & 255) << 16) | (((d[b + 1 >> 2] >>8 * ((b + 1) % 4)) & 255) << 8) | ((d[b + 2 >> 2] >> 8 * ((b +2) % 4)) & 255);for (var a = 0; a < 4; a++){if (b * 8 + a * 6 > d.length * 32){f += b64pad}else{f += c.charAt((e >> 6 * (3 - a)) & 63)}}}return f
};
window.f = hex_md5(mwqqppz)

我们发现window.f = hex_md5(mwqqppz)，是通过很多函数加密的，最重要的就是这最后一条，接下来我们来寻找mwqqppz参数。

回到调用oo0O0()函数的部分：

  var _0x2268f9 = Date.parse(new Date()) + 100000000;var _0x57feae = oo0O0(_0x2268f9.toString()) + window.f;const _0x5d83a3 = {page: window.page,m: _0x57feae + "丨" + _0x2268f9 / 1000};

以及eval()那一条代码，分析传入的参数。

eval(atob(window['b'])[J('0x0', ']dQW')](J('0x1', 'GTu!'), '\x27' + mw + '\x27'));

通过分析，我们发现J函数就在oo0O0函数内定义，我们将J函数抠出:

var U = ['W5r5W6VdIHZcT8kU', 'WQ8CWRaxWQirAW=='];
var J = function (o, E) {o = o - 0x0;var N = U[o];if (J['bSSGte'] === undefined) {var Y = function (w) {var m ='abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789+/=',T = String(w)['replace'](/=+$/, '');var A = '';for (var C = 0x0, b, W, l = 0x0; W = T['charAt'](l++); ~W && (b = C % 0x4 ? b * 0x40 + W : W, C++ % 0x4) ?A += String['fromCharCode'](0xff & b >> (-0x2 * C &0x6)) : 0x0) {W = m['indexOf'](W)}return A};var t = function (w, m) {var T = [],A = 0x0,C, b = '',W = '';w = Y(w);for (var R = 0x0, v = w['length']; R < v; R++) {W += '%' + ('00' + w['charCodeAt'](R)['toString'](0x10))['slice'](-0x2)}w = decodeURIComponent(W);var l;for (l = 0x0; l < 0x100; l++) {T[l] = l}for (l = 0x0; l < 0x100; l++) {A = (A + T[l] + m['charCodeAt'](l % m['length'])) %0x100, C = T[l], T[l] = T[A], T[A] = C}l = 0x0, A = 0x0;for (var L = 0x0; L < w['length']; L++) {l = (l + 0x1) % 0x100, A = (A + T[l]) % 0x100, C =T[l], T[l] = T[A], T[A] = C, b += String['fromCharCode'](w['charCodeAt'](L) ^ T[(T[l] + T[A]) % 0x100])}return b};J['luAabU'] = t, J['qlVPZg'] = {}, J['bSSGte'] = !![]}var H = J['qlVPZg'][o];return H === undefined ? (J['TUDBIJ'] === undefined && (J['TUDBIJ'] = !![]), N = J['luAabU'](N, E), J['qlVPZg'][o] = N) : N = H, N
};console.log(J('0x0', ']dQW'))
console.log(J('0x1', 'GTu!'))

并在浏览器执行：

得到:

J('0x0', ']dQW')的值为：replace
J('0x1', 'GTu!')的值为：mwqqppz

又'\x27' + mw + '\x27'的值为1715257368000，也就是说这里就是某一个字符串进行replace操作，将mwqqppz替换成了时间戳mw，最终这个字符串就是window['b']的值，是一个base64的编码。

eval()部分的代码即可替换为：

eval(atob(window['b'])["replace"]("mwqqppz","1715257368000"));

通过以上分析，我们可以知道window.f = hex_md5(mwqqppz)中mwqqppz就是时间戳mw，这个例子中时间戳mw的值为1715257368000。

mwqqppz字符串本身只是用于标识需要被替换的占位字符串，无特殊含义，然后通过eval执行。

我们手动替换下oo0O0_eval.js中的window.f = hex_md5(mwqqppz)为console.log(hex_md5("1715257368000"))后执行，得到8d596e76013033e75c3e23015c553c55，正是我们之前在控制台分析的_0x57feae的值。

另外，我们通过猴子脚本hook一下window.f也能得到加密算法。

hook脚本：

设置：

翻页调试：

查看第一个箭头所指的栈，清晰的看到加密算法运行时的代码：

// ...
// 跟我们解混淆后的代码不能说是一样，只能说是完全相同。
// 此处省略。function binl2b64(d) {var c = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var f = "";for (var b = 0; b < d.length * 4; b += 3) {var e = (((d[b >> 2] >> 8 * (b % 4)) & 255) << 16) | (((d[b + 1 >> 2] >> 8 * ((b + 1) % 4)) & 255) << 8) | ((d[b + 2 >> 2] >> 8 * ((b + 2) % 4)) & 255);for (var a = 0; a < 4; a++) {if (b * 8 + a * 6 > d.length * 32) {f += b64pad} else {f += c.charAt((e >> 6 * (3 - a)) & 63)}}}return f
}
;window.f = hex_md5('1715257368000')

完整 JS 加密代码如下：

var window =globalvar hexcase = 0;
var b64pad = "";
var chrsz = 16;function hex_md5(a) {return binl2hex(core_md5(str2binl(a), a.length * chrsz))
}function b64_md5(a) {return binl2b64(core_md5(str2binl(a), a.length * chrsz))
}function str_md5(a) {return binl2str(core_md5(str2binl(a), a.length * chrsz))
}function hex_hmac_md5(a, b) {return binl2hex(core_hmac_md5(a, b))
}function b64_hmac_md5(a, b) {return binl2b64(core_hmac_md5(a, b))
}function str_hmac_md5(a, b) {return binl2str(core_hmac_md5(a, b))
}function md5_vm_test() {return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72"
}function core_md5(p, k) {p[k >> 5] |= 128 << ((k) % 32);p[(((k + 64) >>> 9) << 4) + 14] = k;var o = 1732584193;var n = -271733879;var m = -1732584194;var l = 271733878;for (var g = 0; g < p.length; g += 16) {var j = o;var h = n;var f = m;var e = l;o = md5_ff(o, n, m, l, p[g + 0], 7, -680976936);l = md5_ff(l, o, n, m, p[g + 1], 12, -389564586);m = md5_ff(m, l, o, n, p[g + 2], 17, 606105819);n = md5_ff(n, m, l, o, p[g + 3], 22, -1044525330);o = md5_ff(o, n, m, l, p[g + 4], 7, -176418897);l = md5_ff(l, o, n, m, p[g + 5], 12, 1200080426);m = md5_ff(m, l, o, n, p[g + 6], 17, -1473231341);n = md5_ff(n, m, l, o, p[g + 7], 22, -45705983);o = md5_ff(o, n, m, l, p[g + 8], 7, 1770035416);l = md5_ff(l, o, n, m, p[g + 9], 12, -1958414417);m = md5_ff(m, l, o, n, p[g + 10], 17, -42063);n = md5_ff(n, m, l, o, p[g + 11], 22, -1990404162);o = md5_ff(o, n, m, l, p[g + 12], 7, 1804660682);l = md5_ff(l, o, n, m, p[g + 13], 12, -40341101);m = md5_ff(m, l, o, n, p[g + 14], 17, -1502002290);n = md5_ff(n, m, l, o, p[g + 15], 22, 1236535329);o = md5_gg(o, n, m, l, p[g + 1], 5, -165796510);l = md5_gg(l, o, n, m, p[g + 6], 9, -1069501632);m = md5_gg(m, l, o, n, p[g + 11], 14, 643717713);n = md5_gg(n, m, l, o, p[g + 0], 20, -373897302);o = md5_gg(o, n, m, l, p[g + 5], 5, -701558691);l = md5_gg(l, o, n, m, p[g + 10], 9, 38016083);m = md5_gg(m, l, o, n, p[g + 15], 14, -660478335);n = md5_gg(n, m, l, o, p[g + 4], 20, -405537848);o = md5_gg(o, n, m, l, p[g + 9], 5, 568446438);l = md5_gg(l, o, n, m, p[g + 14], 9, -1019803690);m = md5_gg(m, l, o, n, p[g + 3], 14, -187363961);n = md5_gg(n, m, l, o, p[g + 8], 20, 1163531501);o = md5_gg(o, n, m, l, p[g + 13], 5, -1444681467);l = md5_gg(l, o, n, m, p[g + 2], 9, -51403784);m = md5_gg(m, l, o, n, p[g + 7], 14, 1735328473);n = md5_gg(n, m, l, o, p[g + 12], 20, -1921207734);o = md5_hh(o, n, m, l, p[g + 5], 4, -378558);l = md5_hh(l, o, n, m, p[g + 8], 11, -2022574463);m = md5_hh(m, l, o, n, p[g + 11], 16, 1839030562);n = md5_hh(n, m, l, o, p[g + 14], 23, -35309556);o = md5_hh(o, n, m, l, p[g + 1], 4, -1530992060);l = md5_hh(l, o, n, m, p[g + 4], 11, 1272893353);m = md5_hh(m, l, o, n, p[g + 7], 16, -155497632);n = md5_hh(n, m, l, o, p[g + 10], 23, -1094730640);o = md5_hh(o, n, m, l, p[g + 13], 4, 681279174);l = md5_hh(l, o, n, m, p[g + 0], 11, -358537222);m = md5_hh(m, l, o, n, p[g + 3], 16, -722881979);n = md5_hh(n, m, l, o, p[g + 6], 23, 76029189);o = md5_hh(o, n, m, l, p[g + 9], 4, -640364487);l = md5_hh(l, o, n, m, p[g + 12], 11, -421815835);m = md5_hh(m, l, o, n, p[g + 15], 16, 530742520);n = md5_hh(n, m, l, o, p[g + 2], 23, -995338651);o = md5_ii(o, n, m, l, p[g + 0], 6, -198630844);l = md5_ii(l, o, n, m, p[g + 7], 10, 11261161415);m = md5_ii(m, l, o, n, p[g + 14], 15, -1416354905);n = md5_ii(n, m, l, o, p[g + 5], 21, -57434055);o = md5_ii(o, n, m, l, p[g + 12], 6, 1700485571);l = md5_ii(l, o, n, m, p[g + 3], 10, -1894446606);m = md5_ii(m, l, o, n, p[g + 10], 15, -1051523);n = md5_ii(n, m, l, o, p[g + 1], 21, -2054922799);o = md5_ii(o, n, m, l, p[g + 8], 6, 1873313359);l = md5_ii(l, o, n, m, p[g + 15], 10, -30611744);m = md5_ii(m, l, o, n, p[g + 6], 15, -1560198380);n = md5_ii(n, m, l, o, p[g + 13], 21, 1309151649);o = md5_ii(o, n, m, l, p[g + 4], 6, -145523070);l = md5_ii(l, o, n, m, p[g + 11], 10, -1120210379);m = md5_ii(m, l, o, n, p[g + 2], 15, 718787259);n = md5_ii(n, m, l, o, p[g + 9], 21, -343485551);o = safe_add(o, j);n = safe_add(n, h);m = safe_add(m, f);l = safe_add(l, e)}return Array(o, n, m, l)
}function md5_cmn(h, e, d, c, g, f) {return safe_add(bit_rol(safe_add(safe_add(e, h), safe_add(c, f)), g), d)
}function md5_ff(g, f, k, j, e, i, h) {return md5_cmn((f & k) | ((~f) & j), g, f, e, i, h)
}function md5_gg(g, f, k, j, e, i, h) {return md5_cmn((f & j) | (k & (~j)), g, f, e, i, h)
}function md5_hh(g, f, k, j, e, i, h) {return md5_cmn(f ^ k ^ j, g, f, e, i, h)
}function md5_ii(g, f, k, j, e, i, h) {return md5_cmn(k ^ (f | (~j)), g, f, e, i, h)
}function core_hmac_md5(c, f) {var e = str2binl(c);if (e.length > 16) {e = core_md5(e, c.length * chrsz)}var a = Array(16),d = Array(16);for (var b = 0; b < 16; b++) {a[b] = e[b] ^ 909522486;d[b] = e[b] ^ 1549556828}var g = core_md5(a.concat(str2binl(f)), 512 + f.length * chrsz);return core_md5(d.concat(g), 512 + 128)
}function safe_add(a, d) {var c = (a & 65535) + (d & 65535);var b = (a >> 16) + (d >> 16) + (c >> 16);return (b << 16) | (c & 65535)
}function bit_rol(a, b) {return (a << b) | (a >>> (32 - b))
}function str2binl(d) {var c = Array();var a = (1 << chrsz) - 1;for (var b = 0; b < d.length * chrsz; b += chrsz) {c[b >> 5] |= (d.charCodeAt(b / chrsz) & a) << (b % 32)}return c
}function binl2str(c) {var d = "";var a = (1 << chrsz) - 1;for (var b = 0; b < c.length * 32; b += chrsz) {d += String.fromCharCode((c[b >> 5] >>> (b % 32)) & a)}return d
}function binl2hex(c) {var b = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";var d = "";for (var a = 0; a < c.length * 4; a++) {d += b.charAt((c[a >> 2] >> ((a % 4) * 8 + 4)) & 15) + b.charAt((c[a >>2] >> ((a % 4) * 8)) & 15)}return d
}function binl2b64(d) {var c = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var f = "";for (var b = 0; b < d.length * 4; b += 3) {var e = (((d[b >> 2] >> 8 * (b % 4)) & 255) << 16) | (((d[b + 1 >> 2] >>8 * ((b + 1) % 4)) & 255) << 8) | ((d[b + 2 >> 2] >> 8 * ((b +2) % 4)) & 255);for (var a = 0; a < 4; a++) {if (b * 8 + a * 6 > d.length * 32) {f += b64pad} else {f += c.charAt((e >> 6 * (3 - a)) & 63)}}}return f
};// window.f = hex_md5(mwqqppz)// console.log(hex_md5("1715257368000"))// 整合hex_md5的参数
function get_m_value() {var _0x2268f9 = Date["parse"](new Date()) + 100000000;// var _0x2268f9 = 1715257368000var mwqqppz = _0x2268f9["toString"]();var m = hex_md5(mwqqppz);var m_value = m + '丨' + _0x2268f9 / 1000;return m_value;
};console.log(get_m_value())

在pycharm中运行结果如下：

和浏览器分析时的m值一致，JS逆向过程结束。

大功告成

逆向结束，剩下的编码就是模拟请求，解析结果了。

将curl命令转换为Python、JavaScript等: https://curlconverter.com/

老规矩，借用curl命令转代码工具快速生成代码，略作修改即可，重点是逆向过程分析。

#! -*-conding=: UTF-8 -*-import execjs
import requestscookies = {'tk': '改成自己的tk','sessionid': '改成自己的sessionid',
}headers = {'authority': 'match.yuanrenxue.cn','accept': 'application/json, text/javascript, */*; q=0.01','accept-language': 'zh-CN,zh;q=0.9','cache-control': 'no-cache',# 'cookie': 'tk=7699535563564611254; sessionid=0qtsyidunti3daajuz7l2qkqy3m0knmd','pragma': 'no-cache','referer': 'https://match.yuanrenxue.cn/match/1','sec-ch-ua': '"Not A(Brand";v="99", "Google Chrome";v="121", "Chromium";v="121"','sec-ch-ua-mobile': '?0','sec-ch-ua-platform': '"Windows"','sec-fetch-dest': 'empty','sec-fetch-mode': 'cors','sec-fetch-site': 'same-origin','user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36','x-requested-with': 'XMLHttpRequest',
}params = {'page': 1,'m': '',
}def calculate_m_value():with open('_m.js', mode='r', encoding='utf-8') as f:JsData = f.read()m_value = execjs.compile(JsData).call('get_m_value')# m_value_process = m_value.replace("丨", "%E4%B8%A8")return m_valuedef main() -> int:_sum = 0times = 0for page_number in range(1, 6):params["page"] = page_numberparams["m"] = calculate_m_value()print(params)response = requests.get('https://match.yuanrenxue.cn/api/match/1', params=params, cookies=cookies,headers=headers).json()for data in response["data"]:_sum += data["value"]times += 1if not times:return 0return int(_sum / times)if __name__ == "__main__":result = main()print(int(result))