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   1  <?php
   2  
   3  /**
   4   * Built-In BCMath Modular Exponentiation Engine
   5   *
   6   * PHP version 5 and 7
   7   *
   8   * @category  Math
   9   * @package   BigInteger
  10   * @author    Jim Wigginton <[email protected]>
  11   * @copyright 2017 Jim Wigginton
  12   * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
  13   * @link      http://pear.php.net/package/Math_BigInteger
  14   */
  15  
  16  namespace phpseclib3\Math\BigInteger\Engines\BCMath;
  17  
  18  use phpseclib3\Math\BigInteger\Engines\BCMath;
  19  
  20  /**
  21   * Built-In BCMath Modular Exponentiation Engine
  22   *
  23   * @package BCMath
  24   * @author  Jim Wigginton <[email protected]>
  25   * @access  public
  26   */
  27  abstract class BuiltIn extends BCMath
  28  {
  29      /**
  30       * Performs modular exponentiation.
  31       *
  32       * @param BCMath $x
  33       * @param BCMath $e
  34       * @param BCMath $n
  35       * @return BCMath
  36       */
  37      protected static function powModHelper(BCMath $x, BCMath $e, BCMath $n)
  38      {
  39          $temp = new BCMath();
  40          $temp->value = bcpowmod($x->value, $e->value, $n->value);
  41  
  42          return $x->normalize($temp);
  43      }
  44  }