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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   * @category  Crypt
  11   * @package   DSA
  12   * @author    Jim Wigginton <[email protected]>
  13   * @copyright 2015 Jim Wigginton
  14   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
  15   * @link      http://phpseclib.sourceforge.net
  16   */
  17  
  18  namespace phpseclib3\Crypt\DSA\Formats\Keys;
  19  
  20  use phpseclib3\Math\BigInteger;
  21  
  22  /**
  23   * Raw DSA Key Handler
  24   *
  25   * @package DSA
  26   * @author  Jim Wigginton <[email protected]>
  27   * @access  public
  28   */
  29  abstract class Raw
  30  {
  31      /**
  32       * Break a public or private key down into its constituent components
  33       *
  34       * @access public
  35       * @param array $key
  36       * @param string $password optional
  37       * @return array
  38       */
  39      public static function load($key, $password = '')
  40      {
  41          if (!is_array($key)) {
  42              throw new \UnexpectedValueException('Key should be a array - not a ' . gettype($key));
  43          }
  44  
  45          switch (true) {
  46              case !isset($key['p']) || !isset($key['q']) || !isset($key['g']):
  47              case !$key['p'] instanceof BigInteger:
  48              case !$key['q'] instanceof BigInteger:
  49              case !$key['g'] instanceof BigInteger:
  50              case !isset($key['x']) && !isset($key['y']):
  51              case isset($key['x']) && !$key['x'] instanceof BigInteger:
  52              case isset($key['y']) && !$key['y'] instanceof BigInteger:
  53                  throw new \UnexpectedValueException('Key appears to be malformed');
  54          }
  55  
  56          $options = ['p' => 1, 'q' => 1, 'g' => 1, 'x' => 1, 'y' => 1];
  57  
  58          return array_intersect_key($key, $options);
  59      }
  60  
  61      /**
  62       * Convert a private key to the appropriate format.
  63       *
  64       * @access public
  65       * @param \phpseclib3\Math\BigInteger $p
  66       * @param \phpseclib3\Math\BigInteger $q
  67       * @param \phpseclib3\Math\BigInteger $g
  68       * @param \phpseclib3\Math\BigInteger $y
  69       * @param \phpseclib3\Math\BigInteger $x
  70       * @param string $password optional
  71       * @return string
  72       */
  73      public static function savePrivateKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y, BigInteger $x, $password = '')
  74      {
  75          return compact('p', 'q', 'g', 'y', 'x');
  76      }
  77  
  78      /**
  79       * Convert a public key to the appropriate format
  80       *
  81       * @access public
  82       * @param \phpseclib3\Math\BigInteger $p
  83       * @param \phpseclib3\Math\BigInteger $q
  84       * @param \phpseclib3\Math\BigInteger $g
  85       * @param \phpseclib3\Math\BigInteger $y
  86       * @return string
  87       */
  88      public static function savePublicKey(BigInteger $p, BigInteger $q, BigInteger $g, BigInteger $y)
  89      {
  90          return compact('p', 'q', 'g', 'y');
  91      }
  92  }