逆向案例二十八——某高考志愿网异步请求头参数加密，以及webpack
网址：aHR0cDovL3d3dy54aW5nYW9rYW90Yi5jb20vY29sbGVnZXMvc2VhcmNo
抓包分析，发现请求头有参数u-sign是加密的，载荷没有进行加密，直接跟栈分析。
进入第二个栈，打上断点，分析有没有加密位置。
可以看到参数已经进行加密了
往上跟栈，找到异步位置，打上断点，发现参数没了，这说明加密在异步的函数中
直接进入t的第一个函数，一下子就找到了加密位置，打上断点，发现就是这里加密，加密函数是o
进入o函数里面去看看，打上断点，发现最后的n就是加密位置。
复制下来，写好函数，n没有定义，直接去找n
不要直接进入n函数去复制，会有很多模块，累死人也搞不定。也不要猜测是MD5，我试过了不对的。 往上看看，有新发现。原来是一个webpack。
打上断点，进入加载器r，先全部复制下来。
导出加载器，补环境，现在就去找函数模块了。
缺少什么模块，就去找什么函数模块，添加模块
最终结果：
现在我们有了u-sign,可以带着请求头去访问数据了。
爬取结果：
完整python代码如下。
import requests
import json
import execjs
for page in range(1,21):data = {"keyword": "","provinceNames": [],"natureTypes": [],"eduLevel": "","categories": [],"features": [],"pageIndex": page,"pageSize": 20,"sort": 11}e = '/youzy.dms.basiclib.api.college.query'js_code = execjs.compile(open('中国大学生志愿网逆向.js','r',encoding='utf-8').read())u_sign = js_code.call('get_sign',e,data)url = 'https://uwf7de983aad7a717eb.youzy.cn/youzy.dms.basiclib.api.college.query'headers = {"Accept": "*/*","Accept-Language": "zh-CN,zh;q=0.9","Cache-Control": "no-cache","Connection": "keep-alive","Content-Type": "application/json","Origin": "http://pv4y-pc.youzy.cn","Pragma": "no-cache","Referer": "http://pv4y-pc.youzy.cn/","Sec-Fetch-Dest": "empty","Sec-Fetch-Mode": "cors","Sec-Fetch-Site": "cross-site","User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36","sec-ch-ua-mobile": "?0","u-sign": u_sign,}data = json.dumps(data, separators=(',', ':'))# 发送GET请求response = requests.post(url, headers=headers, data=data).json()print(f'正在爬取第{page}页数据')for item in response['result']['items']:print(item)
完整js代码：
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navigator={};
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e = r && "binary" === r.encoding ? o.stringToBytes(e) : n.stringToBytes(e) : i(e) ? e = Array.prototype.slice.call(e, 0) : Array.isArray(e) || e.constructor === Uint8Array || (e = e.toString());for (var s = t.bytesToWords(e), u = 8 * e.length, c = 1732584193, f = -271733879, d = -1732584194, l = 271733878, h = 0; h < s.length; h++)s[h] = 16711935 & (s[h] << 8 | s[h] >>> 24) | 4278255360 & (s[h] << 24 | s[h] >>> 8);s[u >>> 5] |= 128 << u % 32,s[14 + (u + 64 >>> 9 << 4)] = u;var p = a._ff, b = a._gg, y = a._hh, m = a._ii;for (h = 0; h < s.length; h += 16) {var g = c, v = f, _ = d, w = l;c = p(c, f, d, l, s[h + 0], 7, -680876936),l = p(l, c, f, d, s[h + 1], 12, -389564586),d = p(d, l, c, f, s[h + 2], 17, 606105819),f = p(f, d, l, c, s[h + 3], 22, -1044525330),c = p(c, f, d, l, s[h + 4], 7, -176418897),l = p(l, c, f, d, s[h + 5], 12, 1200080426),d = p(d, l, c, f, s[h + 6], 17, -1473231341),f = p(f, d, l, c, s[h + 7], 22, -45705983),c = p(c, f, d, l, s[h + 8], 7, 1770035416),l = p(l, c, f, d, s[h + 9], 12, -1958414417),d = p(d, l, c, f, s[h + 10], 17, -42063),f = p(f, d, l, c, s[h + 11], 22, -1990404162),c = p(c, f, d, l, s[h + 12], 7, 1804603682),l = p(l, c, f, d, s[h + 13], 12, -40341101),d = p(d, l, c, f, s[h + 14], 17, -1502002290),c = b(c, f = p(f, d, l, c, s[h + 15], 22, 1236535329), d, l, s[h + 1], 5, -165796510),l = b(l, c, f, d, s[h + 6], 9, -1069501632),d = b(d, l, c, f, s[h + 11], 14, 643717713),f = b(f, d, l, c, s[h + 0], 20, -373897302),c = b(c, f, d, l, s[h + 5], 5, -701558691),l = b(l, c, f, d, s[h + 10], 9, 38016083),d = b(d, l, c, f, s[h + 15], 14, -660478335),f = b(f, d, l, c, s[h + 4], 20, -405537848),c = b(c, f, d, l, s[h + 9], 5, 568446438),l = b(l, c, f, d, s[h + 14], 9, -1019803690),d = b(d, l, c, f, s[h + 3], 14, -187363961),f = b(f, d, l, c, s[h + 8], 20, 1163531501),c = b(c, f, d, l, s[h + 13], 5, -1444681467),l = b(l, c, f, d, s[h + 2], 9, -51403784),d = b(d, l, c, f, s[h + 7], 14, 1735328473),c = y(c, f = b(f, d, l, c, s[h + 12], 20, -1926607734), d, l, s[h + 5], 4, -378558),l = y(l, c, f, d, s[h + 8], 11, -2022574463),d = y(d, l, c, f, s[h + 11], 16, 1839030562),f = y(f, d, l, c, s[h + 14], 23, -35309556),c = y(c, f, d, l, s[h + 1], 4, -1530992060),l = y(l, c, f, d, s[h + 4], 11, 1272893353),d = y(d, l, c, f, s[h + 7], 16, -155497632),f = y(f, d, l, c, s[h + 10], 23, -1094730640),c = y(c, f, d, l, s[h + 13], 4, 681279174),l = y(l, c, f, d, s[h + 0], 11, -358537222),d = y(d, l, c, f, s[h + 3], 16, -722521979),f = y(f, d, l, c, s[h + 6], 23, 76029189),c = y(c, f, d, l, s[h + 9], 4, -640364487),l = y(l, c, f, d, s[h + 12], 11, -421815835),d = y(d, l, c, f, s[h + 15], 16, 530742520),c = m(c, f = y(f, d, l, c, s[h + 2], 23, -995338651), d, l, s[h + 0], 6, -198630844),l = m(l, c, f, d, s[h + 7], 10, 1126891415),d = m(d, l, c, f, s[h + 14], 15, -1416354905),f = m(f, d, l, c, s[h + 5], 21, -57434055),c = m(c, f, d, l, s[h + 12], 6, 1700485571),l = m(l, c, f, d, s[h + 3], 10, -1894986606),d = m(d, l, c, f, s[h + 10], 15, -1051523),f = m(f, d, l, c, s[h + 1], 21, -2054922799),c = m(c, f, d, l, s[h + 8], 6, 1873313359),l = m(l, c, f, d, s[h + 15], 10, -30611744),d = m(d, l, c, f, s[h + 6], 15, -1560198380),f = m(f, d, l, c, s[h + 13], 21, 1309151649),c = m(c, f, d, l, s[h + 4], 6, -145523070),l = m(l, c, f, d, s[h + 11], 10, -1120210379),d = m(d, l, c, f, s[h + 2], 15, 718787259),f = m(f, d, l, c, s[h + 9], 21, -343485551),c = c + g >>> 0,f = f + v >>> 0,d = d + _ >>> 0,l = l + w >>> 0}return t.endian([c, f, d, l])};a._ff = function(e, t, r, n, i, o, a) {var s = e + (t & r | ~t & n) + (i >>> 0) + a;return (s << o | s >>> 32 - o) + t},a._gg = function(e, t, r, n, i, o, a) {var s = e + (t & n | r & ~n) + (i >>> 0) + a;return (s << o | s >>> 32 - o) + t},a._hh = function(e, t, r, n, i, o, a) {var s = e + (t ^ r ^ n) + (i >>> 0) + a;return (s << o | s >>> 32 - o) + t},a._ii = function(e, t, r, n, i, o, a) {var s = e + (r ^ (t | ~n)) + (i >>> 0) + a;return (s << o | s >>> 32 - o) + t},a._blocksize = 16,a._digestsize = 16,e.exports = function(e, r) {if (null == e)throw new Error("Illegal argument " + e);var n = t.wordsToBytes(a(e, r));return r && r.asBytes ? 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});
var n =yangxin("6821");
function get_sign(e, t) {var r, i = "9SASji5OWnG41iRKiSvTJHlXHmRySRp1", o = "", a = t || {}, s = (e = e || "").split("?");if (s.length > 0 && (r = s[1]),r) {var u = r.split("&"), c = "";u.forEach((function(e) {var t = e.split("=");c += "".concat(t[0], "=").concat(encodeURI(t[1]), "&")})),o = "".concat(_.trimEnd(c, "&"), "&").concat(i)} elseo = Object.keys(a).length > 0 ? "".concat(JSON.stringify(a), "&").concat(i) : "&".concat(i);o = o.toLowerCase()return n(o);};
// var e = '/youzy.dms.basiclib.api.college.query';
// var t = {
// "keyword": "",
// "provinceNames": [],
// "natureTypes": [],
// "eduLevel": "",
// "categories": [],
// "features": [],
// "pageIndex": 13,
// "pageSize": 20,
// "sort": 11
// };
// console.log(get_sign(e,t))