155 lines
3.1 KiB
PHP
155 lines
3.1 KiB
PHP
<?php
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declare(strict_types=1);
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014-2021 Spomky-Labs
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*
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* This software may be modified and distributed under the terms
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* of the MIT license. See the LICENSE file for details.
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*/
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namespace Cose;
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use Brick\Math\BigInteger as BrickBigInteger;
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use function chr;
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use function hex2bin;
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use InvalidArgumentException;
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use function unpack;
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/**
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* @internal
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*/
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class BigInteger
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{
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/**
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* Holds the BigInteger's value.
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*
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* @var BrickBigInteger
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*/
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private $value;
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private function __construct(BrickBigInteger $value)
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{
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$this->value = $value;
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}
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public static function createFromBinaryString(string $value): self
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{
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$res = unpack('H*', $value);
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if (false === $res) {
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throw new InvalidArgumentException('Unable to convert the data from binary');
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}
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$data = current($res);
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return new self(BrickBigInteger::fromBase($data, 16));
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}
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public static function createFromDecimal(int $value): self
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{
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return new self(BrickBigInteger::of($value));
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}
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/**
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* Converts a BigInteger to a binary string.
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*/
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public function toBytes(): string
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{
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if ($this->value->isEqualTo(BrickBigInteger::zero())) {
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return '';
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}
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$temp = $this->value->toBase(16);
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$temp = 0 !== (mb_strlen($temp, '8bit') & 1) ? '0'.$temp : $temp;
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$temp = hex2bin($temp);
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if (false === $temp) {
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throw new InvalidArgumentException('Unable to convert the data into binary');
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}
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return ltrim($temp, chr(0));
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}
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/**
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* Adds two BigIntegers.
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*
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* @param BigInteger $y
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*
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* @return BigInteger
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*/
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public function add(self $y): self
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{
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$value = $this->value->plus($y->value);
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return new self($value);
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}
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/**
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* Subtracts two BigIntegers.
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*
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* @param BigInteger $y
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*
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* @return BigInteger
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*/
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public function subtract(self $y): self
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{
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$value = $this->value->minus($y->value);
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return new self($value);
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}
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/**
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* Multiplies two BigIntegers.
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*
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* @param BigInteger $x
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*
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* @return BigInteger
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*/
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public function multiply(self $x): self
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{
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$value = $this->value->multipliedBy($x->value);
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return new self($value);
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}
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/**
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* Performs modular exponentiation.
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*
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* @param BigInteger $e
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* @param BigInteger $n
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*
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* @return BigInteger
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*/
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public function modPow(self $e, self $n): self
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{
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$value = $this->value->modPow($e->value, $n->value);
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return new self($value);
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}
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/**
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* Performs modular exponentiation.
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*
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* @param BigInteger $d
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*
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* @return BigInteger
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*/
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public function mod(self $d): self
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{
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$value = $this->value->mod($d->value);
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return new self($value);
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}
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/**
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* Compares two numbers.
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*
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* @param BigInteger $y
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*/
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public function compare(self $y): int
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{
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return $this->value->compareTo($y->value);
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}
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}
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