Keys.php

<?php

declare (strict_types=1);

/*
 * This file is part of Composer.
 *
 * (c) Nils Adermann <naderman@naderman.de>
 *     Jordi Boggiano <j.boggiano@seld.be>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */
namespace Composer\SelfUpdate;

use Composer\Pcre\Preg;

/**
 * @author Jordi Boggiano <j.boggiano@seld.be>
 */
class Keys {
    public static function fingerprint(string $path) : string {
        $hash = strtoupper(hash('sha256', Preg::replace('{\\s}', '', file_get_contents($path))));
        return implode(' ', [
            substr($hash, 0, 8),
            substr($hash, 8, 8),
            substr($hash, 16, 8),
            substr($hash, 24, 8),
            '',
            // Extra space
substr($hash, 32, 8),
            substr($hash, 40, 8),
            substr($hash, 48, 8),
            substr($hash, 56, 8),
        ]);
    }

}