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/**
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/**
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 * Pure-PHP BigInteger Engine
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 * Pure-PHP BigInteger Engine
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 *
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 *
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 * PHP version 5 and 7
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 * PHP version 5 and 7
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 *
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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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 * @author    Jim Wigginton <terrafrost@php.net>
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 * @copyright 2017 Jim Wigginton
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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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 * @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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 * @link      http://pear.php.net/package/Math_BigInteger
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 */
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 */
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use phpseclib3\Exception\BadConfigurationException;
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use phpseclib3\Exception\BadConfigurationException;
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/**
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/**
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 * Pure-PHP Engine.
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 * Pure-PHP Engine.
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 *
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 *
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 * @package PHP
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 * @author  Jim Wigginton <terrafrost@php.net>
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 * @author  Jim Wigginton <terrafrost@php.net>
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 * @access  public
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 */
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 */
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abstract class PHP extends Engine
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abstract class PHP extends Engine
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{
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{
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    /**#@+
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    /**#@+
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     * Array constants
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     * Array constants
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     *
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     *
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     * Rather than create a thousands and thousands of new BigInteger objects in repeated function calls to add() and
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     * Rather than create a thousands and thousands of new BigInteger objects in repeated function calls to add() and
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     * multiply() or whatever, we'll just work directly on arrays, taking them in as parameters and returning them.
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     * multiply() or whatever, we'll just work directly on arrays, taking them in as parameters and returning them.
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     *
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     *
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     * @access protected
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     */
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     */
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    /**
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    /**
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     * $result[self::VALUE] contains the value.
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     * $result[self::VALUE] contains the value.
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     */
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     */
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    const VALUE = 0;
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    const VALUE = 0;
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    /**
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    /**
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     * Karatsuba Cutoff
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     * Karatsuba Cutoff
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     *
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     *
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     * At what point do we switch between Karatsuba multiplication and schoolbook long multiplication?
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     * At what point do we switch between Karatsuba multiplication and schoolbook long multiplication?
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     *
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     *
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     * @access private
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     */
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     */
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    const KARATSUBA_CUTOFF = 25;
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    const KARATSUBA_CUTOFF = 25;
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    /**
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    /**
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     * Can Bitwise operations be done fast?
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     * Can Bitwise operations be done fast?
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     *
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     *
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     * @see parent::bitwise_leftRotate()
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     * @see parent::bitwise_leftRotate()
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     * @see parent::bitwise_rightRotate()
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     * @see parent::bitwise_rightRotate()
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     * @access protected
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     */
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     */
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    const FAST_BITWISE = true;
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    const FAST_BITWISE = true;
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    /**
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    /**
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     * Engine Directory
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     * Engine Directory
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     *
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     *
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     * @see parent::setModExpEngine
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     * @see parent::setModExpEngine
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     * @access protected
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     */
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     */
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    const ENGINE_DIR = 'PHP';
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    const ENGINE_DIR = 'PHP';
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    /**
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    /**
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     * Default constructor
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     * Default constructor