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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                    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 ? n : r && r.asString ? o.bytesToString(n) : t.bytesToHex(n)
            }
        }()
    },
    "00d8": function(e, t) {
        !function() {
            var t = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"
              , r = {
                rotl: function(e, t) {
                    return e << t | e >>> 32 - t
                },
                rotr: function(e, t) {
                    return e << 32 - t | e >>> t
                },
                endian: function(e) {
                    if (e.constructor == Number)
                        return 16711935 & r.rotl(e, 8) | 4278255360 & r.rotl(e, 24);
                    for (var t = 0; t < e.length; t++)
                        e[t] = r.endian(e[t]);
                    return e
                },
                randomBytes: function(e) {
                    for (var t = []; e > 0; e--)
                        t.push(Math.floor(256 * Math.random()));
                    return t
                },
                bytesToWords: function(e) {
                    for (var t = [], r = 0, n = 0; r < e.length; r++,
                    n += 8)
                        t[n >>> 5] |= e[r] << 24 - n % 32;
                    return t
                },
                wordsToBytes: function(e) {
                    for (var t = [], r = 0; r < 32 * e.length; r += 8)
                        t.push(e[r >>> 5] >>> 24 - r % 32 & 255);
                    return t
                },
                bytesToHex: function(e) {
                    for (var t = [], r = 0; r < e.length; r++)
                        t.push((e[r] >>> 4).toString(16)),
                        t.push((15 & e[r]).toString(16));
                    return t.join("")
                },
                hexToBytes: function(e) {
                    for (var t = [], r = 0; r < e.length; r += 2)
                        t.push(parseInt(e.substr(r, 2), 16));
                    return t
                },
                bytesToBase64: function(e) {
                    for (var r = [], n = 0; n < e.length; n += 3)
                        for (var i = e[n] << 16 | e[n + 1] << 8 | e[n + 2], o = 0; o < 4; o++)
                            8 * n + 6 * o <= 8 * e.length ? r.push(t.charAt(i >>> 6 * (3 - o) & 63)) : r.push("=");
                    return r.join("")
                },
                base64ToBytes: function(e) {
                    e = e.replace(/[^A-Z0-9+\/]/gi, "");
                    for (var r = [], n = 0, i = 0; n < e.length; i = ++n % 4)
                        0 != i && r.push((t.indexOf(e.charAt(n - 1)) & Math.pow(2, -2 * i + 8) - 1) << 2 * i | t.indexOf(e.charAt(n)) >>> 6 - 2 * i);
                    return r
                }
            };
            e.exports = r
        }()
    },
     "9a63": function(e, t) {
        var r = {
            utf8: {
                stringToBytes: function(e) {
                    return r.bin.stringToBytes(unescape(encodeURIComponent(e)))
                },
                bytesToString: function(e) {
                    return decodeURIComponent(escape(r.bin.bytesToString(e)))
                }
            },
            bin: {
                stringToBytes: function(e) {
                    for (var t = [], r = 0; r < e.length; r++)
                        t.push(255 & e.charCodeAt(r));
                    return t
                },
                bytesToString: function(e) {
                    for (var t = [], r = 0; r < e.length; r++)
                        t.push(String.fromCharCode(e[r]));
                    return t.join("")
                }
            }
        };
        e.exports = r
    },
    8349: function(e, t) {
        function r(e) {
            return !!e.constructor && "function" == typeof e.constructor.isBuffer && e.constructor.isBuffer(e)
        }
        e.exports = function(e) {
            return null != e && (r(e) || function(e) {
                return "function" == typeof e.readFloatLE && "function" == typeof e.slice && r(e.slice(0, 0))
            }(e) || !!e._isBuffer)
        }
    },
});
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)
            } else
                o = 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))