<?php
declare(strict_types=1);
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2021 Spomky-Labs
*
* This software may be modified and distributed under the terms
* of the MIT license. See the LICENSE file for details.
*/
namespace Webauthn\Util;
use Cose\Algorithm\Signature\ECDSA;
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 ECDSA\ES256K::ID:
case ECDSA\ES256::ID:
if (64 === mb_strlen($signature, '8bit')) {
return $signature;
}
return ECDSA\ECSignature::fromAsn1($signature, 64); //TODO: fix this hardcoded value by adding a dedicated method for the algorithms
case ECDSA\ES384::ID:
if (96 === mb_strlen($signature, '8bit')) {
return $signature;
}
return ECDSA\ECSignature::fromAsn1($signature, 96);
case ECDSA\ES512::ID:
if (132 === mb_strlen($signature, '8bit')) {
return $signature;
}
return ECDSA\ECSignature::fromAsn1($signature, 132);
}
return $signature;
}
}