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827 daniel-mar 1 
<?php
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/**
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 * Built-In BCMath Modular Exponentiation Engine
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 *
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 * PHP version 5 and 7
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 *
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 * @category  Math
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 * @package   BigInteger
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 * @author    Jim Wigginton <terrafrost@php.net>
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 * @copyright 2017 Jim Wigginton
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 * @license   http://www.opensource.org/licenses/mit-license.html  MIT License
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 * @link      http://pear.php.net/package/Math_BigInteger
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 */
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namespace phpseclib3\Math\BigInteger\Engines\BCMath;
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use phpseclib3\Math\BigInteger\Engines\BCMath;
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/**
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 * Built-In BCMath Modular Exponentiation Engine
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 *
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 * @package BCMath
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 * @author  Jim Wigginton <terrafrost@php.net>
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 * @access  public
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 */
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abstract class BuiltIn extends BCMath
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{
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    /**
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     * Performs modular exponentiation.
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     *
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     * @param BCMath $x
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     * @param BCMath $e
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     * @param BCMath $n
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     * @return BCMath
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     */
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    protected static function powModHelper(BCMath $x, BCMath $e, BCMath $n)
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    {
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        $temp = new BCMath();
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        $temp->value = bcpowmod($x->value, $e->value, $n->value);
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        return $x->normalize($temp);
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    }
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}