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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 function in_array;
  17  use InvalidArgumentException;
  18  use Jose\Component\Core\JWK;
  19  
  20  final class None implements SignatureAlgorithm
  21  {
  22      public function allowedKeyTypes(): array
  23      {
  24          return ['none'];
  25      }
  26  
  27      public function sign(JWK $key, string $input): string
  28      {
  29          $this->checkKey($key);
  30  
  31          return '';
  32      }
  33  
  34      public function verify(JWK $key, string $input, string $signature): bool
  35      {
  36          return '' === $signature;
  37      }
  38  
  39      public function name(): string
  40      {
  41          return 'none';
  42      }
  43  
  44      /**
  45       * @throws InvalidArgumentException if the key type is invalid
  46       */
  47      private function checkKey(JWK $key): void
  48      {
  49          if (!in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
  50              throw new InvalidArgumentException('Wrong key type.');
  51          }
  52      }
  53  }