bench-prf.php

<?php

$SIZE = 4987;

$data = array();
$seed = array();

for ($i = 0; $i < $SIZE; $i++) {
  $data[] = hash('sha512', microtime().$i.@$seed[$i-1], true);
  $seed[] = hash('sha224', microtime().$i.@$data[$i-1], true);
}

foreach (hash_algos() as $algo) {

  hash_hmac($algo, '', '');
  do {
    $n = 0;
    $m = 0;
    $M = 0;

    for ($i = 0; $i < $SIZE; $i++) {
      $t0 = microtime();
      hash_hmac($algo, $data[$i], $seed[$i]);
      $t1 = microtime();

      $t0 = explode(' ', $t0);
      $t1 = explode(' ', $t1);
      $t0 = $t0[1] . substr($t0[0], 1);
      $t1 = $t1[1] . substr($t1[0], 1);

      $x = bcmul(bcsub($t1, $t0, 6), 1000000);
      $d = $x - $m;
      $m += $d / ++$n;
      $M += $d * ($x - $m);
    }

    $s = sqrt($M / ($n-1));
    printf("\r(%9.5f ± %9.5f) µs  %s\033[K", $m, $s, $algo);

  } while ($s/$m >= 0.15 && $n < 79*$SIZE);
  printf("\n");
}