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   1  <?php
   2  
   3  /**
   4   * Raw DSA Key Handler
   5   *
   6   * PHP version 5
   7   *
   8   * Reads and creates arrays as DSA keys
   9   *
  10   * @author    Jim Wigginton <terrafrost@php.net>
  11   * @copyright 2015 Jim Wigginton
  12   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
  13   * @link      http://phpseclib.sourceforge.net
  14   */
  15  
  16  namespace phpseclib3\Crypt\DSA\Formats\Keys;
  17  
  18  use phpseclib3\Math\BigInteger;
  19  
  20  /**
  21   * Raw DSA Key Handler
  22   *
  23   * @author  Jim Wigginton <terrafrost@php.net>
  24   */
  25  abstract class Raw
  26  {
  27      /**
  28       * Break a public or private key down into its constituent components
  29       *
  30       * @param array $key
  31       * @param string $password optional
  32       * @return array
  33       */
  34      public static function load($key, $password = '')
  35      {
  36          if (!is_array($key)) {
  37              throw new \UnexpectedValueException('Key should be a array - not a ' . gettype($key));
  38          }
  39  
  40          switch (true) {
  41              case !isset($key['p']) || !isset($key['q']) || !isset($key['g']):
  42              case !$key['p'] instanceof BigInteger:
  43              case !$key['q'] instanceof BigInteger:
  44              case !$key['g'] instanceof BigInteger:
  45              case !isset($key['x']) && !isset($key['y']):
  46              case isset($key['x']) && !$key['x'] instanceof BigInteger:
  47              case isset($key['y']) && !$key['y'] instanceof BigInteger:
  48                  throw new \UnexpectedValueException('Key appears to be malformed');
  49          }
  50  
  51          $options = ['p' => 1, 'q' => 1, 'g' => 1, 'x' => 1, 'y' => 1];
  52  
  53          return array_intersect_key($key, $options);
  54      }
  55  
  56      /**
  57       * Convert a private key to the appropriate format.
  58       *
  59       * @param \phpseclib3\Math\BigInteger $p
  60       * @param \phpseclib3\Math\BigInteger $q
  61       * @param \phpseclib3\Math\BigInteger $g
  62       * @param \phpseclib3\Math\BigInteger $y
  63       * @param \phpseclib3\Math\BigInteger $x
  64       * @param string $password optional
  65       * @return string
  66       */
  67      public static function savePrivateKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, BigInteger $x, $password = '')
  68      {
  69          return compact('p', 'q', 'g', 'y', 'x');
  70      }
  71  
  72      /**
  73       * Convert a public key to the appropriate format
  74       *
  75       * @param \phpseclib3\Math\BigInteger $p
  76       * @param \phpseclib3\Math\BigInteger $q
  77       * @param \phpseclib3\Math\BigInteger $g
  78       * @param \phpseclib3\Math\BigInteger $y
  79       * @return string
  80       */
  81      public static function savePublicKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y)
  82      {
  83          return compact('p', 'q', 'g', 'y');
  84      }
  85  }