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   1  <?php
   2  
   3  declare(strict_types=1);
   4  
   5  /*
   6   * The MIT License (MIT)
   7   *
   8   * Copyright (c) 2014-2019 Spomky-Labs
   9   *
  10   * This software may be modified and distributed under the terms
  11   * of the MIT license.  See the LICENSE file for details.
  12   */
  13  
  14  namespace Cose\Key;
  15  
  16  use Assert\Assertion;
  17  
  18  class SymmetricKey extends Key
  19  {
  20      public const DATA_K = -1;
  21  
  22      public function __construct(array $data)
  23      {
  24          parent::__construct($data);
  25          Assertion::eq($data[self::TYPE], self::TYPE_OCT, 'Invalid symmetric key. The key type does not correspond to a symmetric key');
  26          Assertion::keyExists($data, self::DATA_K, 'Invalid symmetric key. The parameter "k" is missing');
  27      }
  28  
  29      public function k(): string
  30      {
  31          return $this->get(self::DATA_K);
  32      }
  33  }