comparison.php

<?php

function compareHashes($hashOne, $hashTwo)
{
    $result = 0;

    for ($i = 0; $i < strlen($hashOne); $i++) {
        $charOne = substr($hashOne, $i, 1);
        $charTwo = substr($hashTwo, $i, 1);
        $intOne = base_convert($charOne, 16, 10);
        $intTwo = base_convert($charTwo, 16, 10);

        $diff = abs($intOne - $intTwo);

        $result = $result + $diff;
    }

    return $result;
}

function controller($timeInMs, $seed)
{
    $startTime = microtime(true);
    $seedHash = md5($seed);
    $resultString = null;
    $resultDiff = null;
    $iterations = 0;

    while ((microtime(true) - $startTime) < ($timeInMs / 1000)) {
        $iterations++;

        $randomString = bin2hex(random_bytes(4));
        $randomHashCompare = compareHashes($seedHash, md5($randomString));

        if (is_null($resultDiff) || $randomHashCompare < $resultDiff) {
            $resultDiff = $randomHashCompare;
            $resultString = $randomString;
        }
    }

    return [
        'string' => $resultString,
        'diff' => $resultDiff,
        'iterations' => $iterations,
    ];
}

function generateCsv(array $comparisons)
{
    echo implode(',', ['Time', 'Seed', 'Comparisons', 'Diff', 'Nonce']) . PHP_EOL;

    foreach ($comparisons as $word => $time) {
        $comparison = controller($time, $word);

        echo implode(',', [$time, $word, $comparison['iterations'], $comparison['diff'], $comparison['string']]) . PHP_EOL;
    }
//    $csv = '';
//
//    foreach ($results as $result) {
//        $csv .= implode(',', $result) . "\n";
//    }
//
//    return $csv;
}

//var_dump(compareHashes('3b2f', '78a2'));
//var_dump(compareHashes('173d8235', 'ac83ff63'));

//Time,Seed,Comparisons,Diff,Nonce
//25,"madwire",?,?,?
//50,"chello",?,?,?
//100,"donkey",?,?,?
//200,"biscuits",?,?,?
//400,"gerkins",?,?,?
//800,"trusty",?,?,?
//1600,"sanchez",?,?,?
//3200,"wigwam",?,?,?
//6400,"boinker",?,?,?
//12800,"vader",?,?,?
//25600,"blumpkin",?,?,?
//51200,"kitten",?,?,?
//102400,"gymshorts",?,?,?
//204800,"shiftybuckets",?,?,?
//409600,"stompydumper",?,?,?
//819200,"krunkbiscuits",?,?,?

$comparisons = [
    'madwire' => 25,
    'chello' => 50,
    'donkey' => 100,
    'biscuits' => 200,
    'gerkins' => 400,
    'trusty' => 800,
    'sanchez' => 1600,
    'wigwam' => 3200,
    'boinker' => 6400,
    'vader' => 12800,
    'blumpkin' => 25600,
    'kitten' => 51200,
    'gymshorts' => 102400,
    'shiftybuckets' => 204800,
    'stompydumper' => 409600,
    'krunkbiscuits' => 819200,
];

generateCsv($comparisons);

//var_dump(controller(100, 'madwire'));
//var_dump(controller(1000, 'madwire'));
//var_dump(controller(10000, 'madwire'));

//echo md5('madwire').PHP_EOL;