hashpower.js

'use strict';

function fromArray(arr) {
	let num = 0n;
	for(let x of arr) {
		num <<= 8n;
		num |= BigInt(x);
	}
	return num;
}
function toArray(num, big) {
	let arr = [];
	
	while(num) {
		arr.push(Number(num%256n));
		num /= 256n;
	}
	// Little endian deconstruction, must reverse bytes
	return new Uint8Array(arr.reverse());
}
function strength(x) {
	return /^(1*)/.exec(x.toString(2).padStart(256, 0))[1].length;
}
function test(t) {
	let stop = false;

	async function hash() {
		let max = 0, n = 0;
		while(!stop) {
			let r = new Uint8Array(crypto.getRandomValues(new Uint32Array(4)));
			let h = fromArray(new Uint8Array(await crypto.subtle.digest("SHA-256", r)));
			//console.log(h.toString(2).slice(0, 20), strength(h));
			if(h > max) max = h;
			++n;
		}
		console.log(max, strength(max), n);
	}

	setTimeout((() => stop = true), t);
	hash();
}

test(1000);