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<?php declare(strict_types=1); namespace Jose\Component\KeyManagement\Analyzer; use Brick\Math\BigInteger; use Jose\Component\Core\JWK; use Jose\Component\Core\Util\Ecc\Curve; use ParagonIE\ConstantTime\Base64UrlSafe; use function is_string; abstract class ESKeyAnalyzer implements KeyAnalyzer { public function analyze(JWK $jwk, MessageBag $bag): void { if ($jwk->get('kty') !== 'EC') { return; } if (! $jwk->has('crv')) { $bag->add(Message::high('Invalid key. The components "crv" is missing.')); return; } if ($jwk->get('crv') !== $this->getCurveName()) { return; } $x = $jwk->get('x'); if (! is_string($x)) { $bag->add(Message::high('Invalid key. The components "x" shall be a string.')); return; } $x = Base64UrlSafe::decodeNoPadding($x); $xLength = 8 * mb_strlen($x, '8bit'); $y = $jwk->get('y'); if (! is_string($y)) { $bag->add(Message::high('Invalid key. The components "y" shall be a string.')); return; } $y = Base64UrlSafe::decodeNoPadding($y); $yLength = 8 * mb_strlen($y, '8bit'); if ($yLength !== $xLength || $yLength !== $this->getKeySize()) { $bag->add( Message::high(sprintf( 'Invalid key. The components "x" and "y" size shall be %d bits.', $this->getKeySize() )) ); } $xBI = BigInteger::fromBase(bin2hex($x), 16); $yBI = BigInteger::fromBase(bin2hex($y), 16); if (! $this->getCurve()->contains($xBI, $yBI)) { $bag->add(Message::high('Invalid key. The point is not on the curve.')); } } abstract protected function getAlgorithmName(): string; abstract protected function getCurveName(): string; abstract protected function getCurve(): Curve; abstract protected function getKeySize(): int; }
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