0.概述
现在越来越多的网站用到了前端的JS混淆或者展示数据混淆加密，以及对传输的信息进行前端加密之后在传输。提高了爬取网站数据难度，以及渗透测试过程中对登录接口爆破难度。
这个系列主要是针对某网站爬虫大赛中题目逆向过程简单记录。共计17道题，从简至难，项目地址如下：
http://match.yuanrenxue.com/list
关于某网站爬虫大赛第一题详细题解分析过程，实战地址：
http://match.yuanrenxue.com/match/1
打开URL看看题目的要求，抓取5页机票的价格，并计算平均值，打开浏览器的调试工具，发现有个debug，选中debug这一行，右键 never pause here，直接就过了。
经过对Network面板中的请求分析，发现机票价格数据是一个XHR请求得到的json数据：
经过多次请求和抓包分析，即使page页面相同，m参数每次都会变，获取数据的唯一变量值就是参数m,但是m 是可以重放的，估计是1分钟的有效期，利用burp抓包，修改page的值，不变参数m,短时间内，一个m值可以把page1-5的所有机票价格都可以获取，前提得修改UA的值为 User-Agent: yuanrenxue.project，这是最简单快捷，不用去分析JS就可以可以获取答案的方法。
但是如果我们用这种方法得到答案，可能就失去了此题的本意了，以下是分析JS代码生成m参数值的过程，然后每次请求都可以生成有效的一次性的参数m的值，通过Python重写获取机票价格的脚本，计算出答案。
1. 定位：
获取数据的是该XHR请求：
http://match.yuanrenxue.com/api/match/1?m=68afadf4945964b792503ed1efe11953%E4%B8%A81606976298
请求m参数的值由两部分构成，中间由中文的|间隔符拼接，右边有点像时间戳，
通过两种方式定位到m参数是如何形成的源码处：
方法1.直接全局搜索中文的丨符号，全局搜索只有一处，那应该就是这里了。
方法2：直接通过request call stack定位过来：
点击进入直接到源码所在处，可以看到生成逻辑就直接在首页的源码中。
2.调试
将关键代码抠出来，放到自己的新建的HTML页面中进行调试：
本地一个web服务
python -m http.server
然后将HTML放到web根路径，加载HTML，现在的思路就是缺什么补什么：
缺oo0O0函数就补该函数
回到第一题的页面，我们可以通过console来获取这个函数的代码
以下是oo0O0函数的定义，加入到本地的HTML代码中
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 ''
}
本地环境，再次运行,报错的是10行oo0O0函数中的 window.a.length, 那么就需要分析Windows window.a是什么：
回到题目中，利用相同的方法在console中输入window.a + ''获取对应的值,然后复制出来加入到本地的HTML代码中。
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ᙣᙧᙉᙫᙍᙯᙚᙚᙍᙈᙧᘸᙙᙴᙚᙢᙜᙻᙦᙷᙈᙺᙲᙚᙝᚎᙺᙿᚂᚅᙲ᙭ᚆᙔ᙭ᙡᚇᚉᙫᙶᙰᙰᙾᙘᚡᚃᚂᙽᙝᚐ᚛ᙣᚗᚊᙥᙤᚡᚙᚍᙬᚢᚁᚧᚲᚧᚁᚩᚢᚙᙸᚷᚒᚴᚕᙸᚬᚳᚳᚶᚘᚦᛃᚂᚪᚪ᚜ᚻᚯᚚᚇᛁᚢᛄᛏᚎᚶᚶᚨᛇᚺᚶᚓᛓᚲᚺᛞᚠᛂ᚜ᛓᛥᛐᚡᛞᛠᚽᛆᚸᚫᛏᛣᚰᛱᛄᛂᛕᛤᛠᛧᛁᛩᛑᛖᛄᚻᛞᛰᛲᛕᛷᜃᛸᛯᛳᛀᛲᛕᜂᜎᛢᜀᜋᜁᛤ᜔ᛌᜆᛦᛩᜆᜋᜏᛛᛩᛡᛝᜥᜎᜅᛤᜟᜍᜭᛨᛨᜁᜁ᜵ᜎᛰᛸᜫ᜕ᜪᜳᛷᜱ᜴ᜥᜢᜃᜡᜟᜪᜤᝑᜤᜭᝆᝉ᜶ᜱᝋᝄᝏ᜔ᝉᜱᜲᜱᜥᝇᝅᝥᝊᜥᝅᝤᜨᜫᝒᝧᝧᝂᝉᝯᝪᝳᝳᝑចᝉᝲᝩᝈᝮᝈធᝳᝮᝓចᝪᝢᝤយᝮវᝳថដᝯខឃលᝪហឰឆឤឈᝬឋធមᝳថឆឯឬឞឳផឳឣឡឤ឵វខឩី឴ុផឿឥឩហេឨឌ឵្ៀះះធឺឺឬ់ើឺភីវឰឤំ៧ឤ៣់៉ឨ២៙ួ៩ះើ៤ៈ៷៲៰៦឴។៶៕៝័២ូ៳៴៰៹៕ៀៜ៕ៈៜៃ៩᠄៥᠀᠈៓᠏៩៨᠐៳៩᠒᠙៸ៜ៸᠁᠆᠈ᠤ᠀៨᠀ᠭ᠒ᠣᠤᠠᠩ᠅៰᠌᠅ᠫᠮ៸᠌៳᠙ᠴ᠕ᠰᠸ᠃ᠿ᠙᠘ᡀᠣ᠙ᡂᡉᠨᡆᡌᠧᡈᠤ᠑ᠬᠺ᠔ᡝᠿᠾᠹ᠙ᡌᡗᡓᡇᠶᠠᡝᡕᡉᠨᡞᡙᠽᡣᡮᡛᡣᠽᡥᡞᡕᠴᡳᡎᡯᡌᠶᡓᡉᡯᡳᡔᡢᠾᡦᡦᡘᡷᡪᢌᡃᡦᡫᡡᡜᡫᡟᡱᡣᡯᡎᢇᡪᡴᢍᢗᡱᡜᡸᡰᡱᢂᡟᢁᢆᢇᢞᢗᢍᢌᢌᢧᢠᢒᢧᢉᢧᢗᢕᢙᢢᢉᢵᢦᡸᢿᢼᢷᢄᣃᢰᢦᢙᣊᢵᢚᢩᢆᢹᢉᢿᢍᢾᣄᢜᣔᢪᣈᢐᢶᢼᢗᢴᢪᣒᣚᢵᣣᢴᢣᣑᣛᢵᣩᢺᢹᣌᢾᣟᣀᣓᣧᢴᣵᣈᣆᣙᣨᣤᣫᣅᣭᣕᣚᣈᢿᣢᣴᤃᣙᤇᣳᣄᣙᤆᣈᣨᣌᣤᤎᣭᣲᣬᤐᤆᣕᤌᤈᤏᣩᤔᤒᤛᣵᤁᤒᤊᤜᣧᣟᤂᤢᣧᣣᤉᤤᤢᤈᤅᤈᤏᤅᤴᤏᤰᤐᤗᤝᤶᤄᤝᤒᤔᤂᤜᤪ᥊ᤠᤙᤰᤌᤤ᥎ᤪᤲᤓᤋ᥎ᤓᤏᤵᥐ᥎ᥙᤴᥓᥕᤸᥨᤴᥠ᤻᥆᥄ᥤ᥀᥉ᥐᥱ᥇᥎ᥐᥬ᥍ᤴ᥌ᥚᥳᥐ᥍ᥙᥪᥢᥳᦅᥝᦉᥩᥦ᥇ᥤᥙᦆᦇᥤᥡᥤᦎᥪᦇᦊᦌᥥᦎᦔᦐᥰᥙᦖᥣᦇᦛᥨᦩᦍᦜᦘᦟᦠᦉᦎᥳᦖᦒᦶᥰᦐᥴᦈᦶᦐᦿᦳᦪᦡᦤᦻᦦᦷᦾᦄᦜᦄᦘᧅᦣᧀᦌᧃᦥᧇ᧓ᧈᦿᧃᦐᧂᦥ᧒᧞ᦲ᧓ᦟᧃ᧓᧞ᦥᧆ᧘ᧈᦠ᧔ᦹᦹ᧟᧫᧑ᦳ᧗᧧᧲ᦹ᧚᧻ᦸ᧮᧦ᨁ᧚᧢᧻᧘᧕᧤ᦻ᧡᧼᧬ᨅ᧠᧚᧤ᨌ᧲᧭ᨆᨌ᧧ᨈ᧸ᨚ᧬᧺᧔ᨋ᧾᧱ᨔᨍ᧲ᨁᨥᨏᨗ᧱ᨗᨆᨧ᧧ᨖᨍ᧬ᨣᨛ᧭᨞ᨱᨗᨧᨀ᧹ᨊᨉᨫᨰᨪᨌᨀᨼᨣᨎᨠᨻᨯᨦᨳᩈᨴᨪᨕᩋᨺᨿᩂᨕ"
本地环境，再次运行,报错的是14行oo0O0函数中的 window.a[i][(document.f + document.h)]
回到题目中，看看(document.f + document.h)是什么顺便将oo0O0函数的定义中的document.g和document.e)一起撸了 ：
document.e='fromC';document.f='charCo';document.g='harCode';document.h='deAt';
在本地加入这些代码之后运行调试，报错是56行的eval(atob(window['b'])[J('0x0', ']dQW')](J('0x1', 'GTu!'), '\x27' + mw + '\x27'));
先看看atob(window['b'])是什么，JavaScript中atob() 方法用于解码使用 base-64 编码的字符串，那window['b']应该是base64编码的字符串，在题目源站的console直接输入atob(window['b'])获取数据,或者输入window['b']获取原始的base64值，其他地方进行base64解码也行。
"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"
直接将window['b']赋值放本地的HTML页面中：
再刷新本地的HTML页面，发现可以正常执行获取console.log(m)，
此时运行没有报错了，说明加密逻辑需要的代码已经足够了，回到最初的m生成的代码这里。
m = oo0O0(timestamp.toString()) + window.f;
说明window.f的值在atob(window['b'])解码里面，所以这里还是要去关注atob(window['b'])具体的值，base64解码之后：
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)
在代码最后可以看到window.f = hex_md5(mwqqppz),熟悉的MD5加密。
还不清楚mwqqppz是什么，接着分析，eval(atob(window['b'])[J('0x0', ']dQW')](J('0x1', 'GTu!'), '\x27' + mw + '\x27'));中剩下的逻辑，直接在console中声明J函数，或者在代码中加断点进入J函数中，在console可以输入对应的值：
还原eval(atob(window['b'])[J('0x0', ']dQW')](J('0x1', 'GTu!'), '\x27' + mw + '\x27'));的逻辑为：
eval(window['b'].replace('mwqqppz','mw')
而且上面的分析中，mwqqppz是window.f = hex_md5(mwqqppz)的参数，作用就是将window.f = hex_md5(mwqqppz)参数换成oo0O0函数的参数。
而且oo0O0函数的最后可以看到return ''返回是空值，那实际
m = window.f;
var m=oo0O0(timestamp.toString())+window.f;
oo0O0函数最后返回的是空值，但是在调用的时候讲window.f = hex_md5(mwqqppz)参数给替换成了oo0O0参数，实际调用时候oo0O0函数的传参为timestamp.toString()，也就是时间戳字符串。
那么实际
var m = hex_md5(timestamp.toString())
而在oo0O0函数中可以看到,Date.parse()函数用于分析一个包含日期的字符串，timestamp是时间戳数字。
var timestamp = Date.parse(new Date());
//这里获取时间戳方法是将毫秒改成000显示
那最后m参数的值为
m = hex_md5(timestamp.toString()) + '丨'+ timestamp/1000
然后利用Python编写脚本爬取数据进行答题，进过测试base64解码出来的MD5加密算法不是标准的MD5，经过修改的，所以不能用Python自带的标准MD5加密算法编写，为了省时间直接Python的execjs调用解码之后的js MD5代码。
import requests
import execjs
jscode = """var timestamp = (Date.parse(new Date())).toString(); 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};mm=hex_md5(timestamp)"""
ctx= execjs.compile(jscode)
sum = 0
count = 0
for i in range(1,6):
timestamp = int(ctx.eval('timestamp'))
m = ctx.eval("mm") + '丨' + str(timestamp // 1000)
args = {
'page':i,
'm': m
}
datas = requests.get('http://match.yuanrenxue.com/api/match/1?', params=args, headers = {'User-Agent':'yuanrenxue.project'}).json()
for value in datas['data']:
print(value)
sum = sum + value['value']
count = count + 1
result = sum /count
print('result',result)
运行结果：
{'value': 8179}
{'value': 6177}
{'value': 4174}
{'value': 5945}
{'value': 9556}
{'value': 2318}
{'value': 4}
{'value': 2653}
{'value': 4855}
{'value': 1370}
{'value': 2366}
{'value': 2108}
{'value': 6159}
{'value': 5685}
{'value': 2010}
{'value': 7109}
{'value': 1002}
{'value': 9300}
{'value': 8995}
{'value': 5732}
{'value': 5535}
{'value': 7126}
{'value': 7472}
{'value': 4129}
{'value': 2724}
{'value': 3475}
{'value': 3605}
{'value': 7729}
{'value': 1860}
{'value': 833}
{'value': 3937}
{'value': 6420}
{'value': 115}
{'value': 4333}
{'value': 6674}
{'value': 383}
{'value': 5922}
{'value': 7344}
{'value': 7012}
{'value': 8009}
{'value': 9297}
{'value': 8727}
{'value': 4130}
{'value': 1910}
{'value': 5976}
{'value': 2973}
{'value': 1756}
{'value': 6725}
{'value': 1716}
{'value': 1456}
result 4700.0
来源：freebuf.com 2021-01-15 17:14:42 by: yiran4827
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