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<?php |
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declare(strict_types=1); |
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/* |
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* The MIT License (MIT) |
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* |
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* Copyright (c) 2014-2019 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 file for details. |
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*/ |
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namespace Jose\Component\KeyManagement\Analyzer; |
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use Base64Url\Base64Url; |
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use Jose\Component\Core\JWK; |
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use Jose\Component\Core\Util\Ecc\NistCurve; |
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use RuntimeException; |
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final class ES512KeyAnalyzer implements KeyAnalyzer |
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{ |
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public function __construct() |
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{ |
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if (!class_exists(NistCurve::class)) { |
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throw new RuntimeException('Please install web-token/jwt-util-ecc to use this key analyzer'); |
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} |
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} |
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public function analyze(JWK $jwk, MessageBag $bag): void |
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{ |
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if ('EC' !== $jwk->get('kty')) { |
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return; |
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} |
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if (!$jwk->has('crv')) { |
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$bag->add(Message::high('Invalid key. The components "crv" is missing.')); |
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return; |
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} |
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if ('P-521' !== $jwk->get('crv')) { |
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return; |
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} |
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$x = Base64Url::decode($jwk->get('x')); |
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$xLength = 8 * mb_strlen($x, '8bit'); |
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$y = Base64Url::decode($jwk->get('y')); |
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$yLength = 8 * mb_strlen($y, '8bit'); |
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if ($yLength !== $xLength || 528 !== $yLength) { |
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$bag->add(Message::high('Invalid key. The components "x" and "y" size shall be 528 bits.')); |
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} |
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$xGmp = gmp_init(bin2hex($x), 16); |
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$yGmp = gmp_init(bin2hex($y), 16); |
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$curve = NistCurve::curve521(); |
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if (!$curve->contains($xGmp, $yGmp)) { |
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$bag->add(Message::high('Invalid key. The point is not on the curve.')); |
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} |
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} |
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} |
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web-token /
jwt-framework
