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   1  <?php
   2  /**
   3   * This file is part of Lcobucci\JWT, a simple library to handle JWT and JWS
   4   *
   5   * @license http://opensource.org/licenses/BSD-3-Clause BSD-3-Clause
   6   */
   7  
   8  namespace Lcobucci\JWT\Signer;
   9  
  10  use Lcobucci\JWT\Signer\Ecdsa\MultibyteStringConverter;
  11  use Lcobucci\JWT\Signer\Ecdsa\SignatureConverter;
  12  use const OPENSSL_KEYTYPE_EC;
  13  
  14  /**
  15   * Base class for ECDSA signers
  16   *
  17   * @author Luís Otávio Cobucci Oblonczyk <[email protected]>
  18   * @since 2.1.0
  19   */
  20  abstract class Ecdsa extends OpenSSL
  21  {
  22      /**
  23       * @var SignatureConverter
  24       */
  25      private $converter;
  26  
  27      public function __construct(SignatureConverter $converter = null)
  28      {
  29          $this->converter = $converter ?: new MultibyteStringConverter();
  30      }
  31  
  32      /**
  33       * {@inheritdoc}
  34       */
  35      public function createHash($payload, Key $key)
  36      {
  37          return $this->converter->fromAsn1(
  38              parent::createHash($payload, $key),
  39              $this->getKeyLength()
  40          );
  41      }
  42  
  43      /**
  44       * {@inheritdoc}
  45       */
  46      public function doVerify($expected, $payload, Key $key)
  47      {
  48          return parent::doVerify(
  49              $this->converter->toAsn1($expected, $this->getKeyLength()),
  50              $payload,
  51              $key
  52          );
  53      }
  54  
  55      /**
  56       * Returns the length of each point in the signature, so that we can calculate and verify R and S points properly
  57       *
  58       * @internal
  59       */
  60      abstract public function getKeyLength();
  61  
  62      /**
  63       * {@inheritdoc}
  64       */
  65      final public function getKeyType()
  66      {
  67          return OPENSSL_KEYTYPE_EC;
  68      }
  69  }