1.目标

网址：https://y.qq.com/n/ryqq/toplist/26

切换榜单出现请求，可以看到sign和data是加密的

2.逆向分析

搜索sign:


可以看到sign = P(n.data)，而n.data就是请求的加密data参数

data = '{"comm":{"cv":4747474,"ct":24,"format":"json","inCharset":"utf-8","outCharset":"utf-8","notice":0,"platform":"yqq.json","needNewCode":1,"uin":0,"g_tk_new_20200303":5381,"g_tk":5381},"req_1":{"module":"musicToplist.ToplistInfoServer","method":"GetDetail","param":{"topid":27,"offset":0,"num":20,"period":"2025-05-27"}}}'

3.webpack分析

这是Webpack 打包后的模块加载代码

在这里打上断点找加载器n，然后刷新页面

可以看到加载器的name是"f"，数组m里面390个模块
点击进入就是加载器

可以看到是以列表的方式存储模块的，
然后将获取sign的模块，就是含有下面内容的模块，放进去

var P = G._getSecuritySign;
var L = j.__cgiEncrypt
 , N = j.__cgiDecrypt;

• G._getSecuritySign
  • 获取sign
• j.__cgiEncrypt
  • 加密请求参数data
• j.__cgiDecrypt
  • 解密响应二进制数据

window = global;

!function(e) {
    function r() {
        for (var e, t = 0; t < d.length; t++) {
            for (var r = d[t], a = !0, n = 1; n < r.length; n++) {
                var c = r[n];
                0 !== o[c] && (a = !1)
            }
            a && (d.splice(t--, 1),
            e = f(f.s = r[0]))
        }
        return e
    }
    var a = {}
      , n = {
        21: 0
    }
      , o = {
        21: 0
    }
      , d = [];
    function f(t) {
        if (a[t])
            return a[t].exports;
        var r = a[t] = {
            i: t,
            l: !1,
            exports: {}
        };
        console.log(t)
        return e[t].call(r.exports, r, r.exports, f),
        r.l = !0,
        r.exports
    }
    f.m = e,
    f.c = a,
    f.d = function(e, t, r) {
        f.o(e, t) || Object.defineProperty(e, t, {
            enumerable: !0,
            get: r
        })
    }
    ,
    f.r = function(e) {
        "undefined" !== typeof Symbol && Symbol.toStringTag && Object.defineProperty(e, Symbol.toStringTag, {
            value: "Module"
        }),
        Object.defineProperty(e, "__esModule", {
            value: !0
        })
    }
    ,
    f.t = function(e, t) {
        if (1 & t && (e = f(e)),
        8 & t)
            return e;
        if (4 & t && "object" === typeof e && e && e.__esModule)
            return e;
        var r = Object.create(null);
        if (f.r(r),
        Object.defineProperty(r, "default", {
            enumerable: !0,
            value: e
        }),
        2 & t && "string" != typeof e)
            for (var a in e)
                f.d(r, a, function(t) {
                    return e[t]
                }
                .bind(null, a));
        return r
    }
    ,

    f.o = function(e, t) {
        return Object.prototype.hasOwnProperty.call(e, t)
    }
    
    r()
    window.shark = f;
}([]);

console.log(window.shark);

先删除一些无用的代码，然后将模块放进去

如果这么运行的话，毫无疑问是会报错的

        return e[t].call(r.exports, r, r.exports, f),
                    ^

TypeError: Cannot read properties of undefined (reading 'call')

很明显缺少的是下标为81的模块，然后我们去浏览器取该模块


然后这里也不是导入81模块，在这里我们是导入自己的下标为1的模块

然后接下来就是导出全局函数了

打印方法没有问题

4.sign验证

get_sign = (data) => window.shark(0).getSign(data);

data = '{"comm":{"cv":4747474,"ct":24,"format":"json","inCharset":"utf-8","outCharset":"utf-8","notice":0,"platform":"yqq.json","needNewCode":1,"uin":0,"g_tk_new_20200303":5381,"g_tk":5381},"req_1":{"module":"musicToplist.ToplistInfoServer","method":"GetDetail","param":{"topid":27,"offset":0,"num":20,"period":"2025-05-28"}}}'

console.log(get_sign(data))

写个箭头函数验证能否生成sign

运行代码可以生成sign

但是和浏览器的sign不一样，而且data是一样的，这就是缺少必要的环境

window = global;

document = {
    cookie: 'pgv_pvid=592785550; fqm_pvqid=75e53579-6875-45e3-9bfa-8c3634fd8b23; fqm_sessionid=4742d993-b7c2-4148-b070-67c2ac322bc7; pgv_info=ssid=s6945372512; ts_last=y.qq.com/n/ryqq/toplist/26; ts_refer=cn.bing.com/; ts_uid=4872983500',
    createElement: function(res){
        if(res == 'a') return {}
    },
}
navigator = {
    userAgent: "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36",

}
location = {
    "href": "https://y.qq.com/",
    "host": "y.qq.com",
}

补充环境之后发现和浏览器的一致

sign算法逆向参见：https://blog.csdn.net/2406_83321119/article/details/146435985