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<?php declare(strict_types=1); namespace Jose\Component\KeyManagement\Analyzer; use Jose\Component\Core\JWK; use Jose\Component\Core\Util\Base64UrlSafe; use function is_string; final class OctAnalyzer implements KeyAnalyzer { public function analyze(JWK $jwk, MessageBag $bag): void { if ($jwk->get('kty') !== 'oct') { return; } $k = $jwk->get('k'); if (! is_string($k)) { $bag->add(Message::high('The key is not valid')); return; } $k = Base64UrlSafe::decodeNoPadding($k); $kLength = 8 * mb_strlen($k, '8bit'); if ($kLength < 128) { $bag->add(Message::high('The key length is less than 128 bits.')); } } }
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