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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 <terrafrost@php.net>
  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 <terrafrost@php.net>
  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. }
  45.