# defender-security/6.3.0/lib/packages/Cose/Key/SymmetricKey.php

Defender Security – Malware Scanner, Login Security & Firewall, version 6.3.0. 34 lines.

- Page: https://pluginprobe.com/plugins/defender-security/6.3.0/code/lib/packages/Cose/Key/SymmetricKey.php
- Raw: https://pluginprobe.com/plugins/defender-security/6.3.0/raw/lib/packages/Cose/Key/SymmetricKey.php
- Modified: 2026-08-24T08:19:12+00:00

Line numbers below start at 1. Link to a line or a range by appending a fragment to the
page URL, for example `https://pluginprobe.com/plugins/defender-security/6.3.0/code/lib/packages/Cose/Key/SymmetricKey.php#L10-L20`.

```php
<?php

declare(strict_types=1);

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2021 Spomky-Labs
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */

namespace WP_DEFENDER_VENDOR\Cose\Key;

use WP_DEFENDER_VENDOR\Assert\Assertion;

class SymmetricKey extends Key
{
    public const DATA_K = -1;

    public function __construct(array $data)
    {
        parent::__construct($data);
        Assertion::eq($data[self::TYPE], self::TYPE_OCT, 'Invalid symmetric key. The key type does not correspond to a symmetric key');
        Assertion::keyExists($data, self::DATA_K, 'Invalid symmetric key. The parameter "k" is missing');
    }

    public function k(): string
    {
        return $this->get(self::DATA_K);
    }
}

```