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<?php declare(strict_types=1); namespace Webauthn\Util; use Cose\Algorithm\Signature\ECDSA; use Cose\Algorithm\Signature\ECDSA\ECSignature; use Cose\Algorithm\Signature\ECDSA\ES256; use Cose\Algorithm\Signature\ECDSA\ES256K; use Cose\Algorithm\Signature\ECDSA\ES384; use Cose\Algorithm\Signature\ECDSA\ES512; use Cose\Algorithm\Signature\Signature; /** * This class fixes the signature of the ECDSA based algorithms. * * @internal * * @see https://www.w3.org/TR/webauthn/#signature-attestation-types */ abstract class CoseSignatureFixer { public static function fix(string $signature, Signature $algorithm): string { switch ($algorithm::identifier()) { case ES256K::ID: case ES256::ID: if (mb_strlen($signature, '8bit') === 64) { return $signature; } return ECSignature::fromAsn1( $signature, 64 ); //TODO: fix this hardcoded value by adding a dedicated method for the algorithms case ES384::ID: if (mb_strlen($signature, '8bit') === 96) { return $signature; } return ECSignature::fromAsn1($signature, 96); case ES512::ID: if (mb_strlen($signature, '8bit') === 132) { return $signature; } return ECSignature::fromAsn1($signature, 132); } return $signature; } }
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