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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\Algorithm\Signature\EdDSA;
  15  
  16  use Assert\Assertion;
  17  use Cose\Algorithm\Signature\Signature;
  18  use Cose\Algorithms;
  19  use Cose\Key\Key;
  20  use Cose\Key\OkpKey;
  21  use InvalidArgumentException;
  22  use function sodium_crypto_sign_detached;
  23  use function sodium_crypto_sign_verify_detached;
  24  
  25  class EdDSA implements Signature
  26  {
  27      public function sign(string $data, Key $key): string
  28      {
  29          $key = $this->handleKey($key);
  30          Assertion::true($key->isPrivate(), 'The key is not private');
  31  
  32          $x = $key->x();
  33          $d = $key->d();
  34          $secret = $d.$x;
  35  
  36          switch ($key->curve()) {
  37              case OkpKey::CURVE_ED25519:
  38                  return sodium_crypto_sign_detached($data, $secret);
  39              default:
  40                  throw new InvalidArgumentException('Unsupported curve');
  41          }
  42      }
  43  
  44      public function verify(string $data, Key $key, string $signature): bool
  45      {
  46          $key = $this->handleKey($key);
  47  
  48          switch ($key->curve()) {
  49              case OkpKey::CURVE_ED25519:
  50                  return sodium_crypto_sign_verify_detached($signature, $data, $key->x());
  51              default:
  52                  throw new InvalidArgumentException('Unsupported curve');
  53          }
  54      }
  55  
  56      public static function identifier(): int
  57      {
  58          return Algorithms::COSE_ALGORITHM_EdDSA;
  59      }
  60  
  61      private function handleKey(Key $key): OkpKey
  62      {
  63          return new OkpKey($key->getData());
  64      }
  65  }