encrypting string in javascript without external library

Question

Basically, what I'd like to do is have a JavaScript function that checks whether you've entered a specific string -- but I don't want that string to be actually visible in the source code. In my mind, it would go something like this:

function checkPass(input) {
    if (encrypt(input) === 'OJqqyaQUD4APlZvAg3fvCii8Os9qBr23tlzWwjbw') {
        alert('Success');
    } else {
        alert('Fail');
    }

}

function encrypt(input) {
    //pass it through some encryption algorithm
}

How might I accomplish this –– ideally, without any external libraries?

I wouldn't use clientside code for that. What are you trying to do? — putvande
– putvande, Commented Feb 2, 2016 at 22:14
What @putvande meant to say is, even if you implement an encryption algorithm it will still be visible by simply looking up the source code. So no use of encryption. — user2705585
– user2705585, Commented Feb 2, 2016 at 22:15
@putvande I have no choice in this case, unfortunately. But it's not protecting anything especially important; this is purely just another obstacle that people might have to get through in order to make the obfuscated code even harder to use if they steal it. — Cliff
– Cliff, Commented Feb 2, 2016 at 22:15
@Cliff: If one implements his own algorithm in a Javascript function it will be visible in source code. — user2705585
– user2705585, Commented Feb 2, 2016 at 22:19

JTC · Accepted Answer · 2016-02-02 22:22:32Z

2

Because the javascript can be seen in the source, there is not much you can do.

Minify - in order to make it harder to read and obfuscation

Another good thing is to use http://javascript2img.com/ to make it very hard to read.

edited Feb 2, 2016 at 22:22

answered Feb 2, 2016 at 22:15

JTC

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7 Comments

Cliff Over a year ago

I guess I'd hoped javascript might have 64-bit RSA encryption built in.

JTC Over a year ago

Client side javascript cant be used for this kind of stuff unfortunately

Cliff Over a year ago

The problem with all these common obfuscators is that they provide a decoding tool for their algorithm...which basically subverts the point of the obfuscation.

JTC Over a year ago

I've changed the link of obfuscator to the best i could found, claims the hardest to read.

JTC Over a year ago

Well im not saying to use instead of serves side validation, just trying to provide good answer. I think OP knows he should not use this on anything critical on his app.

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