67 lines
2.2 KiB
PHP
67 lines
2.2 KiB
PHP
<?php
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/**
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* Akeeba WebPush
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*
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* An abstraction layer for easier implementation of WebPush in Joomla components.
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*
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* @copyright (c) 2022 Akeeba Ltd
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* @license GNU GPL v3 or later; see LICENSE.txt
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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declare(strict_types=1);
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namespace Akeeba\WebPush\ECC;
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use Brick\Math\BigInteger;
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/**
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* This class is copied verbatim from the JWT Framework by Spomky Labs.
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*
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* You can find the original code at https://github.com/web-token/jwt-framework
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*
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* The original file has the following copyright notice:
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*
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* =====================================================================================================================
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014-2020 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-SPOMKY.txt file for details.
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*
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* =====================================================================================================================
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*
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* @internal
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*/
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class ModularArithmetic
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{
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public static function sub(BigInteger $minuend, BigInteger $subtrahend, BigInteger $modulus): BigInteger
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{
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return $minuend->minus($subtrahend)->mod($modulus);
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}
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public static function mul(BigInteger $multiplier, BigInteger $muliplicand, BigInteger $modulus): BigInteger
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{
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return $multiplier->multipliedBy($muliplicand)->mod($modulus);
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}
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public static function div(BigInteger $dividend, BigInteger $divisor, BigInteger $modulus): BigInteger
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{
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return self::mul($dividend, Math::inverseMod($divisor, $modulus), $modulus);
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}
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}
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