rand_hash.php

#!/usr/bin/php
<?php
$iterations = $argv[1] ? $argv[1] : 1;
$file = "rand.txt";
$dat = file_get_contents($file);

$dat = getHash($dat, $iterations);

echo $dat . "\n";

function getHash($data, $iterations) {
  for ($i=0; $i<$iterations-1; $i++) {
    $data = hash("sha256", $data, true);
  }

  return hash("sha256", $data);
}