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   1  <?php
   2  
   3  /**
   4   * Raw Signature Handler
   5   *
   6   * PHP version 5
   7   *
   8   * Handles signatures as arrays
   9   *
  10   * @category  Crypt
  11   * @package   Common
  12   * @author    Jim Wigginton <[email protected]>
  13   * @copyright 2016 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\Common\Formats\Signature;
  19  
  20  use phpseclib3\Math\BigInteger;
  21  
  22  /**
  23   * Raw Signature Handler
  24   *
  25   * @package Common
  26   * @author  Jim Wigginton <[email protected]>
  27   * @access  public
  28   */
  29  abstract class Raw
  30  {
  31      /**
  32       * Loads a signature
  33       *
  34       * @access public
  35       * @param array $sig
  36       * @return array|bool
  37       */
  38      public static function load($sig)
  39      {
  40          switch (true) {
  41              case !is_array($sig):
  42              case !isset($sig['r']) || !isset($sig['s']):
  43              case !$sig['r'] instanceof BigInteger:
  44              case !$sig['s'] instanceof BigInteger:
  45                  return false;
  46          }
  47  
  48          return [
  49              'r' => $sig['r'],
  50              's' => $sig['s']
  51          ];
  52      }
  53  
  54      /**
  55       * Returns a signature in the appropriate format
  56       *
  57       * @access public
  58       * @param \phpseclib3\Math\BigInteger $r
  59       * @param \phpseclib3\Math\BigInteger $s
  60       * @return string
  61       */
  62      public static function save(BigInteger $r, BigInteger $s)
  63      {
  64          return compact('r', 's');
  65      }
  66  }