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<?php |
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declare(strict_types=1); |
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namespace Mdanter\Ecc\Primitives; |
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use Mdanter\Ecc\Crypto\Key\PrivateKeyInterface; |
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use Mdanter\Ecc\Crypto\Key\PublicKeyInterface; |
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use Mdanter\Ecc\Math\GmpMathInterface; |
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use Mdanter\Ecc\Crypto\Key\PrivateKey; |
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use Mdanter\Ecc\Crypto\Key\PublicKey; |
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use Mdanter\Ecc\Random\RandomGeneratorFactory; |
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use Mdanter\Ecc\Random\RandomNumberGeneratorInterface; |
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/** |
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* Curve point from which public and private keys can be derived. |
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*/ |
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class GeneratorPoint extends Point |
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{ |
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/** |
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* @var RandomNumberGeneratorInterface |
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*/ |
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private $generator; |
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/** |
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* @param GmpMathInterface $adapter |
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* @param CurveFpInterface $curve |
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* @param \GMP $x |
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* @param \GMP $y |
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* @param \GMP $order |
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* @param RandomNumberGeneratorInterface $generator |
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*/ |
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public function __construct( |
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GmpMathInterface $adapter, |
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CurveFpInterface $curve, |
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\GMP $x, |
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\GMP $y, |
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\GMP $order, |
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RandomNumberGeneratorInterface $generator = null |
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) { |
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$this->generator = $generator ?: RandomGeneratorFactory::getRandomGenerator(); |
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parent::__construct($adapter, $curve, $x, $y, $order); |
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} |
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/** |
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* Verifies validity of given coordinates against the current point and its point. |
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* |
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* @todo Check if really necessary here (only used for testing in lib) |
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* @param \GMP $x |
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* @param \GMP $y |
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* @return bool |
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*/ |
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public function isValid(\GMP $x, \GMP $y): bool |
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{ |
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$math = $this->getAdapter(); |
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$n = $this->getOrder(); |
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$zero = gmp_init(0, 10); |
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$curve = $this->getCurve(); |
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if ($math->cmp($x, $zero) < 0 || $math->cmp($n, $x) <= 0 || $math->cmp($y, $zero) < 0 || $math->cmp($n, $y) <= 0) { |
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return false; |
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} |
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if (! $curve->contains($x, $y)) { |
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return false; |
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} |
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$point = $curve->getPoint($x, $y)->mul($n); |
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if (! $point->isInfinity()) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* @return PrivateKeyInterface |
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*/ |
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public function createPrivateKey(): PrivateKeyInterface |
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{ |
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$secret = $this->generator->generate($this->getOrder()); |
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return new PrivateKey($this->getAdapter(), $this, $secret); |
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} |
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/** |
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* @param \GMP $x |
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* @param \GMP $y |
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* @return PublicKeyInterface |
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*/ |
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public function getPublicKeyFrom(\GMP $x, \GMP $y): PublicKeyInterface |
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{ |
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$pubPoint = $this->getCurve()->getPoint($x, $y, $this->getOrder()); |
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return new PublicKey($this->getAdapter(), $this, $pubPoint); |
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} |
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/** |
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* @param \GMP $secretMultiplier |
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* @return PrivateKeyInterface |
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*/ |
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public function getPrivateKeyFrom(\GMP $secretMultiplier): PrivateKeyInterface |
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{ |
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return new PrivateKey($this->getAdapter(), $this, $secretMultiplier); |
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} |
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} |
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shanecurran /
phpecc
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