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   1  <?php
   2  
   3  /**
   4   * DH Private Key
   5   *
   6   * @author    Jim Wigginton <terrafrost@php.net>
   7   * @copyright 2015 Jim Wigginton
   8   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
   9   * @link      http://phpseclib.sourceforge.net
  10   */
  11  
  12  namespace phpseclib3\Crypt\DH;
  13  
  14  use phpseclib3\Crypt\Common;
  15  use phpseclib3\Crypt\DH;
  16  
  17  /**
  18   * DH Private Key
  19   *
  20   * @author  Jim Wigginton <terrafrost@php.net>
  21   */
  22  final class PrivateKey extends DH
  23  {
  24      use Common\Traits\PasswordProtected;
  25  
  26      /**
  27       * Private Key
  28       *
  29       * @var \phpseclib3\Math\BigInteger
  30       */
  31      protected $privateKey;
  32  
  33      /**
  34       * Public Key
  35       *
  36       * @var \phpseclib3\Math\BigInteger
  37       */
  38      protected $publicKey;
  39  
  40      /**
  41       * Returns the public key
  42       *
  43       * @return DH\PublicKey
  44       */
  45      public function getPublicKey()
  46      {
  47          $type = self::validatePlugin('Keys', 'PKCS8', 'savePublicKey');
  48  
  49          if (!isset($this->publicKey)) {
  50              $this->publicKey = $this->base->powMod($this->privateKey, $this->prime);
  51          }
  52  
  53          $key = $type::savePublicKey($this->prime, $this->base, $this->publicKey);
  54  
  55          return DH::loadFormat('PKCS8', $key);
  56      }
  57  
  58      /**
  59       * Returns the private key
  60       *
  61       * @param string $type
  62       * @param array $options optional
  63       * @return string
  64       */
  65      public function toString($type, array $options = [])
  66      {
  67          $type = self::validatePlugin('Keys', $type, 'savePrivateKey');
  68  
  69          if (!isset($this->publicKey)) {
  70              $this->publicKey = $this->base->powMod($this->privateKey, $this->prime);
  71          }
  72  
  73          return $type::savePrivateKey($this->prime, $this->base, $this->privateKey, $this->publicKey, $this->password, $options);
  74      }
  75  }