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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   * @author    Jim Wigginton <terrafrost@php.net>
  11   * @copyright 2016 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\Common\Formats\Signature;
  17  
  18  use phpseclib3\Math\BigInteger;
  19  
  20  /**
  21   * Raw Signature Handler
  22   *
  23   * @author  Jim Wigginton <terrafrost@php.net>
  24   */
  25  abstract class Raw
  26  {
  27      /**
  28       * Loads a signature
  29       *
  30       * @param array $sig
  31       * @return array|bool
  32       */
  33      public static function load($sig)
  34      {
  35          switch (true) {
  36              case !is_array($sig):
  37              case !isset($sig['r']) || !isset($sig['s']):
  38              case !$sig['r'] instanceof BigInteger:
  39              case !$sig['s'] instanceof BigInteger:
  40                  return false;
  41          }
  42  
  43          return [
  44              'r' => $sig['r'],
  45              's' => $sig['s']
  46          ];
  47      }
  48  
  49      /**
  50       * Returns a signature in the appropriate format
  51       *
  52       * @param \phpseclib3\Math\BigInteger $r
  53       * @param \phpseclib3\Math\BigInteger $s
  54       * @return string
  55       */
  56      public static function save(BigInteger $r, BigInteger $s)
  57      {
  58          return compact('r', 's');
  59      }
  60  }