天津培训网站建设网站建设caiyiduo

目标网站： 某查查
对目标网站分析发现

红框内的参数和值都是加密的，是根据算法算出来的，故进行逆向分析。
由于没有固定参数名，只能通过搜索headers，在搜索的位置上打上断点，重新请求。

断点在此处断住，其实i就是key，l就是value，由于key和value有值，因此简化i = a.default(t, e.data)，l =r.default(t, e.data, (s.default)()),现在e.data为undefined，登录之后有些页面才用到这个参数。

var n = a.default(t, undefined)
var l = r.default(t, undefined, (s.default()))

先分析a.default

里面生成了一个i.default 函数

扣下整个i.default函数

i.default = function () {var e = arguments.length > 1 && void 0 !== arguments[1] ? arguments[1] : {}, t = (arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : "/").toLowerCase(), n = JSON.stringify(e).toLowerCase();return (0,o.default)(t + n, (0,a.default)(t)).toLowerCase().substr(8, 20)
}

里面还有o.default()和a.default()两个函数，在这两个地方下断点，点进去o.default()

 i.default = function (e, t) {return (0,o.default)(e, t).toString()
}

里面还有o.default(),打上断点从新进入此方法，发现是HMAC算法,将相同的e，t代入加解密后得到是hmacSHA512加密，用标准库写上这个算法

const crypto = require('crypto')
function hmacSHA512(message, key){const hmac = crypto.createHmac('sha512', key)hmac.update(message)const digest = hmac.digest('hex')return digest
}

断点下在a.default()，点进去

  i.default = function() {for (var e = (arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : "/").toLowerCase(), t = e + e, n = "", i = 0; i < t.length; ++i) {var a = t[i].charCodeAt() % o.default.n;n += o.default.codes[a]}return n}

此函数内还有o.default，再下断点发现o.default是数组,直接写死

odefault = {"n": 20,"codes": {"0": "W","1": "l","2": "k","3": "B","4": "Q","5": "g","6": "f","7": "i","8": "i","9": "r","10": "v","11": "6","12": "A","13": "K","14": "N","15": "k","16": "4","17": "L","18": "1","19": "8"}
}

t是地址，暂时也写死

t = '/api/home/getnewsflash?firstrankindex=1&lastrankindex=0&lastranktime=&pagesize=10'

整合代码

const crypto = require('crypto')
function hmacSHA512(message, key){const hmac = crypto.createHmac('sha512', key)hmac.update(message)const digest = hmac.digest('hex')return digest
}odefault = {"n": 20,"codes": {"0": "W","1": "l","2": "k","3": "B","4": "Q","5": "g","6": "f","7": "i","8": "i","9": "r","10": "v","11": "6","12": "A","13": "K","14": "N","15": "k","16": "4","17": "L","18": "1","19": "8"}
}
r2 = function () {for (var e = (arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : "/").toLowerCase(), t = e + e, n = "", i = 0; i < t.length; ++i) {var a = t[i].charCodeAt() % odefault.n;n += odefault.codes[a]}return n
}var r = function (e, t) {return (0,hmacSHA512)(e, t).toString()
}
var s = function () {var e = arguments.length > 1 && void 0 !== arguments[1] ? arguments[1] : {}, t = (arguments.length > 0 && void 0 !== arguments[0] ? arguments[0] : "/").toLowerCase(), n = JSON.stringify(e).toLowerCase();return (0,r)(t + n, (0,r2)(t)).toLowerCase().substr(8, 20)
}t = '/api/home/getnewsflash?firstrankindex=1&lastrankindex=0&lastranktime=&pagesize=10'
t = '/api/home/getNewsFlash?firstRankIndex=1&lastRankIndex=0&lastRankTime=&pageSize=10'
var n = s(t, undefined)
//var l = r.default(t, undefined, (s.default()))
console.log(n)

对比网站的key，生成正确。value同方法分析。