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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\ECDSA;
  15  
  16  use Assert\Assertion;
  17  use Cose\Algorithm\Signature\Signature;
  18  use Cose\Key\Ec2Key;
  19  use Cose\Key\Key;
  20  
  21  abstract class ECDSA implements Signature
  22  {
  23      public function __construct()
  24      {
  25          if (!method_exists($this, 'getSignaturePartLength')) {
  26              @trigger_error('The method "getSignaturePartLength" is needed since 2.1 and will be mandatory in v3.0', E_USER_DEPRECATED);
  27          }
  28      }
  29  
  30      public function sign(string $data, Key $key): string
  31      {
  32          $key = $this->handleKey($key);
  33          $result = openssl_sign($data, $signature, $key->asPEM(), $this->getHashAlgorithm());
  34          Assertion::true($result, 'Unable to sign the data');
  35  
  36          return $signature;
  37      }
  38  
  39      public function verify(string $data, Key $key, string $signature): bool
  40      {
  41          $key = $this->handleKey($key);
  42          $publicKey = $key->toPublic();
  43  
  44          return 1 === openssl_verify($data, $signature, $publicKey->asPEM(), $this->getHashAlgorithm());
  45      }
  46  
  47      private function handleKey(Key $key): Ec2Key
  48      {
  49          $key = new Ec2Key($key->getData());
  50          Assertion::eq($key->curve(), $this->getCurve(), 'This key cannot be used with this algorithm');
  51  
  52          return $key;
  53      }
  54  
  55      abstract protected function getCurve(): int;
  56  
  57      abstract protected function getHashAlgorithm(): int;
  58  }