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편집 파일: ModularArithmetic.php

<?php declare(strict_types=1); /* * The MIT License (MIT) * * Copyright (c) 2014-2020 Spomky-Labs * * This software may be modified and distributed under the terms * of the MIT license. See the LICENSE file for details. */ namespace Jose\Component\Core\Util\Ecc; use Brick\Math\BigInteger; /** * @internal */ class ModularArithmetic { public static function sub(BigInteger $minuend, BigInteger $subtrahend, BigInteger $modulus): BigInteger { return $minuend->minus($subtrahend)->mod($modulus); } public static function mul(BigInteger $multiplier, BigInteger $muliplicand, BigInteger $modulus): BigInteger { return $multiplier->multipliedBy($muliplicand)->mod($modulus); } public static function div(BigInteger $dividend, BigInteger $divisor, BigInteger $modulus): BigInteger { return self::mul($dividend, Math::inverseMod($divisor, $modulus), $modulus); } }