Current File : /www/varak.net/nextcloud.varak.net/3rdparty/web-auth/webauthn-lib/src/Util/CoseSignatureFixer.php
<?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
{
private const ES256_SIGNATURE_LENGTH = 64;
private const ES384_SIGNATURE_LENGTH = 96;
private const ES512_SIGNATURE_LENGTH = 132;
public static function fix(string $signature, Signature $algorithm): string
{
switch ($algorithm::identifier()) {
case ES256K::ID:
case ES256::ID:
if (mb_strlen($signature, '8bit') === self::ES256_SIGNATURE_LENGTH) {
return $signature;
}
return ECSignature::fromAsn1(
$signature,
self::ES256_SIGNATURE_LENGTH
); //TODO: fix this hardcoded value by adding a dedicated method for the algorithms
case ES384::ID:
if (mb_strlen($signature, '8bit') === self::ES384_SIGNATURE_LENGTH) {
return $signature;
}
return ECSignature::fromAsn1($signature, self::ES384_SIGNATURE_LENGTH);
case ES512::ID:
if (mb_strlen($signature, '8bit') === self::ES512_SIGNATURE_LENGTH) {
return $signature;
}
return ECSignature::fromAsn1($signature, self::ES512_SIGNATURE_LENGTH);
}
return $signature;
}
}
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