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   1  <?php
   2  
   3  declare(strict_types=1);
   4  
   5  /*
   6   * The MIT License (MIT)
   7   *
   8   * Copyright (c) 2014-2020 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 Jose\Component\Signature\Algorithm;
  15  
  16  use InvalidArgumentException;
  17  use Jose\Component\Core\JWK;
  18  
  19  final class HS512 extends HMAC
  20  {
  21      public function name(): string
  22      {
  23          return 'HS512';
  24      }
  25  
  26      protected function getHashAlgorithm(): string
  27      {
  28          return 'sha512';
  29      }
  30  
  31      /**
  32       * @throws InvalidArgumentException if the key is invalid
  33       */
  34      protected function getKey(JWK $key): string
  35      {
  36          $k = parent::getKey($key);
  37          if (mb_strlen($k, '8bit') < 64) {
  38              throw new InvalidArgumentException('Invalid key length.');
  39          }
  40  
  41          return $k;
  42      }
  43  }