372 lines
8.9 KiB
PHP
372 lines
8.9 KiB
PHP
<?php
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/**
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* Pure-PHP 32-bit BigInteger Engine
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*
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* PHP version 5 and 7
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*
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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;
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/**
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* Pure-PHP 32-bit Engine.
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*
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* Uses 64-bit floats if int size is 4 bits
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*
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* @author Jim Wigginton <terrafrost@php.net>
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*/
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class PHP32 extends PHP
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{
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// Constants used by PHP.php
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const BASE = 26;
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const BASE_FULL = 0x4000000;
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const MAX_DIGIT = 0x3FFFFFF;
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const MSB = 0x2000000;
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/**
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* MAX10 in greatest MAX10LEN satisfying
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* MAX10 = 10**MAX10LEN <= 2**BASE.
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*/
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const MAX10 = 10000000;
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/**
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* MAX10LEN in greatest MAX10LEN satisfying
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* MAX10 = 10**MAX10LEN <= 2**BASE.
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*/
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const MAX10LEN = 7;
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const MAX_DIGIT2 = 4503599627370496;
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/**
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* Initialize a PHP32 BigInteger Engine instance
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*
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* @param int $base
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* @see parent::initialize()
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*/
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protected function initialize($base)
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{
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if ($base != 256 && $base != -256) {
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return parent::initialize($base);
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}
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$val = $this->value;
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$this->value = [];
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$vals = &$this->value;
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$i = strlen($val);
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if (!$i) {
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return;
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}
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while (true) {
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$i -= 4;
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if ($i < 0) {
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if ($i == -4) {
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break;
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}
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$val = substr($val, 0, 4 + $i);
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$val = str_pad($val, 4, "\0", STR_PAD_LEFT);
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if ($val == "\0\0\0\0") {
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break;
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}
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$i = 0;
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}
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list(, $digit) = unpack('N', substr($val, $i, 4));
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if ($digit < 0) {
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$digit += 0xFFFFFFFF + 1;
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}
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$step = count($vals) & 3;
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if ($step) {
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$digit = (int) floor($digit / pow(2, 2 * $step));
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}
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if ($step != 3) {
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$digit = (int) fmod($digit, static::BASE_FULL);
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$i++;
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}
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$vals[] = $digit;
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}
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while (end($vals) === 0) {
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array_pop($vals);
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}
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reset($vals);
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}
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/**
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* Test for engine validity
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*
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* @see parent::__construct()
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* @return bool
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*/
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public static function isValidEngine()
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{
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return PHP_INT_SIZE >= 4 && !self::testJITOnWindows();
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}
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/**
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* Adds two BigIntegers.
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*
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* @param PHP32 $y
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* @return PHP32
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*/
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public function add(PHP32 $y)
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{
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$temp = self::addHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
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return $this->convertToObj($temp);
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}
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/**
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* Subtracts two BigIntegers.
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*
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* @param PHP32 $y
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* @return PHP32
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*/
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public function subtract(PHP32 $y)
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{
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$temp = self::subtractHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
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return $this->convertToObj($temp);
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}
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/**
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* Multiplies two BigIntegers.
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*
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* @param PHP32 $y
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* @return PHP32
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*/
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public function multiply(PHP32 $y)
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{
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$temp = self::multiplyHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
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return $this->convertToObj($temp);
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}
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/**
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* Divides two BigIntegers.
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*
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* Returns an array whose first element contains the quotient and whose second element contains the
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* "common residue". If the remainder would be positive, the "common residue" and the remainder are the
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* same. If the remainder would be negative, the "common residue" is equal to the sum of the remainder
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* and the divisor (basically, the "common residue" is the first positive modulo).
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*
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* @param PHP32 $y
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* @return array{PHP32, PHP32}
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*/
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public function divide(PHP32 $y)
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{
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return $this->divideHelper($y);
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}
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/**
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* Calculates modular inverses.
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*
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* Say you have (30 mod 17 * x mod 17) mod 17 == 1. x can be found using modular inverses.
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* @param PHP32 $n
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* @return false|PHP32
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*/
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public function modInverse(PHP32 $n)
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{
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return $this->modInverseHelper($n);
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}
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/**
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* Calculates modular inverses.
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*
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* Say you have (30 mod 17 * x mod 17) mod 17 == 1. x can be found using modular inverses.
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* @param PHP32 $n
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* @return PHP32[]
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*/
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public function extendedGCD(PHP32 $n)
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{
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return $this->extendedGCDHelper($n);
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}
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/**
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* Calculates the greatest common divisor
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*
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* Say you have 693 and 609. The GCD is 21.
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*
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* @param PHP32 $n
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* @return PHP32
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*/
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public function gcd(PHP32 $n)
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{
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return $this->extendedGCD($n)['gcd'];
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}
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/**
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* Logical And
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*
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* @param PHP32 $x
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* @return PHP32
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*/
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public function bitwise_and(PHP32 $x)
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{
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return $this->bitwiseAndHelper($x);
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}
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/**
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* Logical Or
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*
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* @param PHP32 $x
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* @return PHP32
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*/
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public function bitwise_or(PHP32 $x)
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{
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return $this->bitwiseOrHelper($x);
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}
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/**
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* Logical Exclusive Or
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*
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* @param PHP32 $x
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* @return PHP32
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*/
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public function bitwise_xor(PHP32 $x)
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{
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return $this->bitwiseXorHelper($x);
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}
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/**
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* Compares two numbers.
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*
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* Although one might think !$x->compare($y) means $x != $y, it, in fact, means the opposite. The reason for this is
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* demonstrated thusly:
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*
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* $x > $y: $x->compare($y) > 0
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* $x < $y: $x->compare($y) < 0
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* $x == $y: $x->compare($y) == 0
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*
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* Note how the same comparison operator is used. If you want to test for equality, use $x->equals($y).
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*
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* {@internal Could return $this->subtract($x), but that's not as fast as what we do do.}
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*
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* @param PHP32 $y
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* @return int in case < 0 if $this is less than $y; > 0 if $this is greater than $y, and 0 if they are equal.
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* @see self::equals()
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*/
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public function compare(PHP32 $y)
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{
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return $this->compareHelper($this->value, $this->is_negative, $y->value, $y->is_negative);
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}
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/**
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* Tests the equality of two numbers.
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*
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* If you need to see if one number is greater than or less than another number, use BigInteger::compare()
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*
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* @param PHP32 $x
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* @return bool
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*/
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public function equals(PHP32 $x)
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{
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return $this->value === $x->value && $this->is_negative == $x->is_negative;
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}
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/**
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* Performs modular exponentiation.
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*
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* @param PHP32 $e
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* @param PHP32 $n
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* @return PHP32
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*/
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public function modPow(PHP32 $e, PHP32 $n)
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{
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return $this->powModOuter($e, $n);
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}
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/**
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* Performs modular exponentiation.
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*
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* Alias for modPow().
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*
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* @param PHP32 $e
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* @param PHP32 $n
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* @return PHP32
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*/
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public function powMod(PHP32 $e, PHP32 $n)
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{
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return $this->powModOuter($e, $n);
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}
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/**
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* Generate a random prime number between a range
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*
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* If there's not a prime within the given range, false will be returned.
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*
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* @param PHP32 $min
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* @param PHP32 $max
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* @return false|PHP32
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*/
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public static function randomRangePrime(PHP32 $min, PHP32 $max)
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{
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return self::randomRangePrimeOuter($min, $max);
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}
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/**
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* Generate a random number between a range
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*
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* Returns a random number between $min and $max where $min and $max
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* can be defined using one of the two methods:
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*
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* BigInteger::randomRange($min, $max)
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* BigInteger::randomRange($max, $min)
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*
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* @param PHP32 $min
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* @param PHP32 $max
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* @return PHP32
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*/
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public static function randomRange(PHP32 $min, PHP32 $max)
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{
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return self::randomRangeHelper($min, $max);
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}
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/**
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* Performs exponentiation.
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*
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* @param PHP32 $n
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* @return PHP32
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*/
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public function pow(PHP32 $n)
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{
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return $this->powHelper($n);
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}
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/**
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* Return the minimum BigInteger between an arbitrary number of BigIntegers.
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*
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* @param PHP32 ...$nums
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* @return PHP32
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*/
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public static function min(PHP32 ...$nums)
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{
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return self::minHelper($nums);
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}
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/**
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* Return the maximum BigInteger between an arbitrary number of BigIntegers.
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*
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* @param PHP32 ...$nums
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* @return PHP32
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*/
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public static function max(PHP32 ...$nums)
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{
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return self::maxHelper($nums);
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}
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/**
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* Tests BigInteger to see if it is between two integers, inclusive
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*
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* @param PHP32 $min
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* @param PHP32 $max
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* @return bool
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*/
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public function between(PHP32 $min, PHP32 $max)
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{
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return $this->compare($min) >= 0 && $this->compare($max) <= 0;
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}
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}
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