Converting random bytes to an integer range - how?
You can get one 32 bit integer from crypto.randomBytes
with the code below. If you need more than one you can ask for more bytes from crypto.randomBytes
and then use substr
to individually select and convert each integer.
crypto.randomBytes(4, function(ex, buf) {
var hex = buf.toString('hex');
var myInt32 = parseInt(hex, 16);
});
Having said that, you might want to just use Math.floor(Math.random() * maxInteger)
To obtain a cryptographically secure and uniformly distributed value in the [0,1)
interval (i.e. same as Math.random()
) in NodeJS
const random = crypto.randomBytes(4).readUInt32LE() / 0x100000000;
console.log(random); //e.g. 0.9002735135145485
or in the Browser
const random = window.crypto.getRandomValues(new Uint32Array(1))[0] / 0x100000000;
console.log(random);