import java.math.BigInteger;

import java.nio.charset.StandardCharsets;

import java.security.MessageDigest;

import java.time.*;

import java.time.format.DateTimeFormatter;

import java.util.*;

import java.util.regex.Pattern;

public class JavaBenchmark {

public static void main(String[] args) throws Exception {

long t0 = System.nanoTime();

var now = ZonedDateTime.now(ZoneId.systemDefault());

var fmt = DateTimeFormatter.ISO_ZONED_DATE_TIME;

var s = fmt.format(now);

var p = Pattern.compile("([0-9T:\\-+.]+)\\[(.+)]");

var m = p.matcher(s);

String zone = m.find() ? m.group(2) : "UTC";

var list = new ArrayList<>(List.of("alpha", "beta", zone, UUID.randomUUID().toString()));

Collections.sort(list);

String joined = String.join("|", list);

var md = MessageDigest.getInstance("SHA-256");

byte[] dig = md.digest(joined.getBytes(StandardCharsets.UTF_8));

BigInteger prime = BigInteger.probablePrime(1024, new Random(42));

long tookMs = (System.nanoTime() - t0) / 1_000_000;

System.out.println("OK " + dig[0] + " " + prime.bitLength() + " took=" + tookMs + "ms");

}

}