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PowerOfTwo.php
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<?php /** * PHP Power of Two Modular Exponentiation Engine * * PHP version 5 and 7 * * @author Jim Wigginton <terrafrost@php.net> * @copyright 2017 Jim Wigginton * @license http://www.opensource.org/licenses/mit-license.html MIT License * @link http://pear.php.net/package/Math_BigInteger */ namespace phpseclib3\Math\BigInteger\Engines\PHP\Reductions; use phpseclib3\Math\BigInteger\Engines\PHP\Base; /** * PHP Power Of Two Modular Exponentiation Engine * * @author Jim Wigginton <terrafrost@php.net> */ abstract class PowerOfTwo extends Base { /** * Prepare a number for use in Montgomery Modular Reductions * * @param array $x * @param array $n * @param string $class * @return array */ protected static function prepareReduce(array $x, array $n, $class) { return self::reduce($x, $n, $class); } /** * Power Of Two Reduction * * @param array $x * @param array $n * @param string $class * @return array */ protected static function reduce(array $x, array $n, $class) { $lhs = new $class(); $lhs->value = $x; $rhs = new $class(); $rhs->value = $n; $temp = new $class(); $temp->value = [1]; $result = $lhs->bitwise_and($rhs->subtract($temp)); return $result->value; } }