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ðŸ“„ HS256.php(578 B)
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ðŸ“„ Hmac.php(1.09 KB)
ðŸ“„ Mac.php(486 B)

Editing: Hmac.php

<?php

declare(strict_types=1);

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2019 Spomky-Labs
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */

namespace Cose\Algorithm\Mac;

use Assert\Assertion;
use Cose\Key\Key;

abstract class Hmac implements Mac
{
    public function hash(string $data, Key $key): string
    {
        $this->checKey($key);
        $signature = hash_hmac($this->getHashAlgorithm(), $data, $key->get(-1), true);

return mb_substr($signature, 0, $this->getSignatureLength() / 8, '8bit');
    }

public function verify(string $data, Key $key, string $signature): bool
    {
        return hash_equals($this->hash($data, $key), $signature);
    }

private function checKey(Key $key): void
    {
        Assertion::eq($key->type(), 4, 'Invalid key. Must be of type symmetric');
        Assertion::true($key->has(-1), 'Invalid key. The value of the key is missing');
    }

abstract protected function getHashAlgorithm(): string;

abstract protected function getSignatureLength(): int;
}

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