How does JavaScript code obfuscation work?

Question:

I would like to know how this thing of "obfuscating" a JavaScript code works.

For example, there is an online service on a website that "obfuscates" the code on the spot. You just paste your code and it returns the whole "obfuscated" code:

Simple code example:

console.log("Olá mundo!");

It is returned:

var _0x6b39=["\x4F\x6C\xE1\x20\x6D\x75\x6E\x64\x6F\x21","\x6C\x6F\x67"];console[_0x6b39[1]](_0x6b39[0])

And it works fine (run the snippet below):

var _0x6b39=["\x4F\x6C\xE1\x20\x6D\x75\x6E\x64\x6F\x21","\x6C\x6F\x67"];console[_0x6b39[1]](_0x6b39[0])

What kind of algorithm or system is used to convert the code into a tangle of characters, letters and numbers? How does it work?

The site in question is this one at this link .

Answer:

This isn't encryption. This is just hexadecimal (Base16), just like any other encoding like Base64, Base32, Base91…

If you make one:

fmt.Println(hex.EncodeToString([]byte("Olá mundo!")))

You will have exactly:

4f6cc3a1206d756e646f21

As you can see here . For JavaScript to "interpret" hexadecimal as a string you use \x , normally languages ​​use 0xHH or \xHH , other patterns exist, these two I believe are the most common.


Using JavaScript itself, you can do this:

function toHex(str) {
    var result = '';
    for (var i=0; i<str.length; i++) {
        result += str.charCodeAt(i).toString(16);
    }
    return result;
}

Source.

Then you can do:

"\\x" + toHex('Olá Mundo!').match(/.{2}/g).join("\\x");

As a result you will have:

\x4f\x6c\xe1\x20\x6d\x75\x6e\x64\x6f\x21

Obviously, this is completely reversible, as the content is shown in alert() .


There are other obfuscation techniques, like JSFuck , where the same alert() would become:

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!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[+!+[]]+([][[]]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]+[])[+!+[]+[+!+[]]]+([][[]]+[])[+[]]+([][[]]+[])[+!+[]]+([][[]]+[])[!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([]+[])[(![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+([][[]]+[])[+!+[]]+(!![]+[])[+[]]+([][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]]+[])[!+[]+!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[+!+[]+[+[]]]+(!![]+[])[+!+[]]]()[+!+[]+[!+[]+!+[]]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!+[]+[+[]]]+(![]+[])[!+[]+!+[]]+(!![]+[])[+[]]+(!![]+[])[!+[]+!+[]+!+[]]+(!![]+[])[+!+[]]])[!+[]+!+[]+[+[]]])()

But clearly all these methods are reversible. Renaming the variables is just to make it harder to read, making it less understandable.

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