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/**
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/**
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 * Base BigInteger Engine
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 * Base 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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namespace phpseclib3\Math\BigInteger\Engines;
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namespace phpseclib3\Math\BigInteger\Engines;
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use ParagonIE\ConstantTime\Hex;
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use phpseclib3\Common\Functions\Strings;
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use phpseclib3\Common\Functions\Strings;
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use phpseclib3\Crypt\Random;
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use phpseclib3\Crypt\Random;
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use phpseclib3\Exception\BadConfigurationException;
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use phpseclib3\Exception\BadConfigurationException;
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use phpseclib3\Math\BigInteger;
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use phpseclib3\Math\BigInteger;
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/**
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/**
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 * Base Engine.
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 * Base Engine.
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 *
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 *
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 * @package Engine
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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 Engine implements \JsonSerializable
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abstract class Engine implements \JsonSerializable
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{
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{
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    /* final protected */ const PRIMES = [
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    /* final protected */ const PRIMES = [
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        3,   5,   7,   11,  13,  17,  19,  23,  29,  31,  37,  41,  43,  47,  53,  59,
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        3,   5,   7,   11,  13,  17,  19,  23,  29,  31,  37,  41,  43,  47,  53,  59,
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                $x = preg_replace('#^(?:0x)?([A-Fa-f0-9]*).*#', '$1', $x);
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                $x = preg_replace('#^(?:0x)?([A-Fa-f0-9]*).*#', '$1', $x);
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                $is_negative = false;
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                $is_negative = false;
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                if ($base < 0 && hexdec($x[0]) >= 8) {
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                if ($base < 0 && hexdec($x[0]) >= 8) {
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                    $this->is_negative = $is_negative = true;
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                    $this->is_negative = $is_negative = true;
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                    $x = Hex::encode(~Hex::decode($x));
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                    $x = Strings::bin2hex(~Strings::hex2bin($x));
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                }
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                }
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                $this->value = $x;
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                $this->value = $x;
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                $this->initialize($base);
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                $this->initialize($base);
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     * @param bool $twos_compliment
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     * @param bool $twos_compliment
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     * @return string
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     * @return string
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     */
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     */
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    public function toHex($twos_compliment = false)
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    public function toHex($twos_compliment = false)
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    {
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    {
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        return Hex::encode($this->toBytes($twos_compliment));
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        return Strings::bin2hex($this->toBytes($twos_compliment));
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    }
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    }
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    /**
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    /**
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     * Converts a BigInteger to a bit string (eg. base-2).
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     * Converts a BigInteger to a bit string (eg. base-2).
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     *
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     *