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<?php |
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declare(strict_types=1); |
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namespace Mdanter\Ecc\Crypto\Key; |
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/** |
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* ********************************************************************* |
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* Copyright (C) 2012 Matyas Danter |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining |
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* a copy of this software and associated documentation files (the "Software"), |
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* to deal in the Software without restriction, including without limitation |
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* the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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* and/or sell copies of the Software, and to permit persons to whom the |
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* Software is furnished to do so, subject to the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be included |
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* in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES |
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
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* OTHER DEALINGS IN THE SOFTWARE. |
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* *********************************************************************** |
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*/ |
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use Mdanter\Ecc\Exception\PublicKeyException; |
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use Mdanter\Ecc\Math\GmpMathInterface; |
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use Mdanter\Ecc\Primitives\CurveFpInterface; |
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use Mdanter\Ecc\Primitives\GeneratorPoint; |
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use Mdanter\Ecc\Primitives\PointInterface; |
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/** |
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* This class serves as public- private key exchange for signature verification |
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*/ |
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class PublicKey implements PublicKeyInterface |
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{ |
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/** |
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* |
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* @var CurveFpInterface |
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*/ |
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private $curve; |
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/** |
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* |
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* @var GeneratorPoint |
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*/ |
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private $generator; |
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/** |
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* |
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* @var PointInterface |
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*/ |
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private $point; |
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/** |
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* |
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* @var GmpMathInterface |
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*/ |
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private $adapter; |
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/** |
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* Initialize a new PublicKey instance. |
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* |
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* @param GmpMathInterface $adapter |
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* @param GeneratorPoint $generator |
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* @param PointInterface $point |
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*/ |
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public function __construct(GmpMathInterface $adapter, GeneratorPoint $generator, PointInterface $point) |
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{ |
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$this->curve = $generator->getCurve(); |
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$this->generator = $generator; |
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$this->point = $point; |
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$this->adapter = $adapter; |
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// step 1: not point at infinity. |
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if ($point->isInfinity()) { |
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throw new PublicKeyException($generator, $point, "Cannot use point at infinity for public key"); |
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} |
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// step 2 full & partial public key validation routine |
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if ($adapter->cmp($point->getX(), gmp_init(0, 10)) < 0 || $adapter->cmp($this->curve->getPrime(), $point->getX()) < 0 |
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|| $adapter->cmp($point->getY(), gmp_init(0, 10)) < 0 || $adapter->cmp($this->curve->getPrime(), $point->getY()) < 0 |
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) { |
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throw new PublicKeyException($generator, $point, "Point has x and y out of range."); |
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} |
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// Sanity check. Point (x,y) values are qualified against it's |
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// generator and curve. Here we ensure the Point and Generator |
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// are the same. |
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if (!$generator->getCurve()->equals($point->getCurve())) { |
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throw new PublicKeyException($generator, $point, "Curve for given point not in common with GeneratorPoint"); |
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} |
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} |
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/** |
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* {@inheritDoc} |
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* @see \Mdanter\Ecc\Crypto\Key\PublicKeyInterface::getCurve() |
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*/ |
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public function getCurve(): CurveFpInterface |
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{ |
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return $this->curve; |
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} |
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/** |
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* {$inheritDoc} |
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* @see \Mdanter\Ecc\Crypto\Key\PublicKeyInterface::getGenerator() |
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*/ |
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public function getGenerator(): GeneratorPoint |
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{ |
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return $this->generator; |
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} |
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/** |
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* {@inheritDoc} |
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* @see \Mdanter\Ecc\Crypto\Key\PublicKeyInterface::getPoint() |
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*/ |
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public function getPoint(): PointInterface |
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{ |
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return $this->point; |
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} |
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} |
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shanecurran /
phpecc
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