HmacFactory.php

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<?php
namespace Elgg\Security;

use ElggCrypto;
use Elgg\Database\SiteSecret;

class HmacFactory {

    private $site_secret;

    private $crypto;

    public function __construct(SiteSecret $secret, ElggCrypto $crypto) {
        $this->site_secret = $secret;
        $this->crypto = $crypto;
    }

    public function getHmac($data, $algo = 'sha256', $key = '') {
        if (!$key) {
            $key = $this->site_secret->get(true);
        }
        return new Hmac($key, [$this->crypto, 'areEqual'], $data, $algo);
    }
}