Random Password Generator - Using crypto.getRandomValues

[s.arndt]

Hi - I’m building a Random Password Generator. Got most of the functionality figured out.

In my code, I have a function that uses Math.random (I found some code online and used it) to return a shuffled password string. I’ve tried changed the Math.random statement to Crypto but can’t get it to work. How can I change the shuffledString line to use Crypto instead of Math and get the same result.

function shuffleString(str, maxlength) {
var shuffledString = str.split(’’).sort(function(){return 0.5-Math.random()}).join(’’);
if (maxlength > 0) {
shuffledString = shuffledString.substr(0, maxlength);
}
return shuffledString;
}

Note: I’m using rules to adjust the number of uppercase, lowercase, numeric, and special characters that are included in the password string.

[s.arndt]

May have figured this out (thank god for the Internet?)…Not sure if it’s right - but it makes sense…

function cryptoRand()
{
const randomBuffer = new Uint32Array(1);
(window.crypto || window.msCrypto).getRandomValues(randomBuffer);
return ( randomBuffer[0] / (0xffffffff + 1) );
}

function shuffleString(str, maxlength) {

// var shuffledString = str.split(’’).sort(function(){return 0.5-Math.random()}).join(’’);

var shuffledString = str.split('').sort(function(){return 0.5-cryptoRand()}).join('');

if (maxlength > 0) {
    shuffledString = shuffledString.substr(0, maxlength);
}
return shuffledString;

}