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/**
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/**
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 * PHP Modular Exponentiation Engine
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 * PHP Modular Exponentiation 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\Math\BigInteger\Engines\PHP;
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use phpseclib3\Math\BigInteger\Engines\PHP;
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/**
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/**
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 * PHP Modular Exponentiation Engine
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 * PHP Modular Exponentiation 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 Base extends PHP
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abstract class Base extends PHP
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{
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{
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    /**
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    /**
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     * Cache constants
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     * Cache constants
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     *
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     *
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     * $cache[self::VARIABLE] tells us whether or not the cached data is still valid.
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     * $cache[self::VARIABLE] tells us whether or not the cached data is still valid.
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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 VARIABLE = 0;
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    const VARIABLE = 0;
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    /**
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    /**
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     * $cache[self::DATA] contains the cached data.
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     * $cache[self::DATA] contains the cached data.
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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 DATA = 1;
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    const DATA = 1;
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    /**
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    /**
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     * Test for engine validity
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     * Test for engine validity