JS逆向 | JSF*ck，这个看着头大的加密其实很简单

龙哥

发布于 2020-03-05 03:49:20

1.2K00

代码可运行

文章被收录于专栏：Python绿色通道Python绿色通道

运行总次数：0

代码可运行

又到练手的时间了，今天聊一下 JSFuck

我遇到过有两款网站用的就是 JSFuck 加密的，这个转换风格第一次遇到的时候内心OS就和这个名字一样。

大家先看看下面的图，一句简单的 hello world 就可以转化为近 5w 字符，看着就头大：

JSFuck是什么？

在讲解决方案之前，我们先来聊聊 JSFuck 是啥？

下面这个网站是 JSFuck 的官网：

http://www.jsfuck.com/

我们可以使用它对我们原有的 JS 代码进行编码风格上的转换。

JSFuck 是使用 [、]、(、)、! 和 + 六种字符来表示原有的字符的，就像下面这样的对应关系：

false       =>  ![]
true        =>  !![]
undefined   =>  [][[]]
NaN         =>  +[![]]
0           =>  +[]
1           =>  +!+[]
2           =>  !+[]+!+[]
10          =>  [+!+[]]+[+[]]
Array       =>  []
Number      =>  +[]
String      =>  []+[]
Boolean     =>  ![]

当然还有更多的对应关系没有列出来，但是这并不重要，我们只需要知道 JSFuck 为啥长这样就可以了，更多知识可以加群讨论，接下来我们实战走一波，直接上解决方案。

如何在实战中处理 JSFuck?

JSFuck 的处理方法有以下几种：

document.write(xxx)
alert(xxx)
console.log(xxx)

这里的 xxx 指的就是 JSFuck 的内容，我们拿个例子测试一下。

这里本来想拿某文书网的 JSFuck 实战的，但是自从某文书网下了瑞数之后，整个网站频繁瘫痪，正常访问都是 502 。

所以这里用另一个例子演示一下：

复制 JSFuck ，打开 开发者模式，切换至 Console 选项卡，输入下面的内容并执行：

/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释 
* 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*/

执行结果如下：