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<?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 Cose\Algorithm\Signature\ECDSA;
use Assert\Assertion;
use Cose\Algorithm\Signature\Signature;
use Cose\Key\Ec2Key;
use Cose\Key\Key;
abstract class ECDSA implements Signature
{
public function sign(string $data, Key $key): string
{
$key = $this->handleKey($key);
openssl_sign($data, $signature, $key->asPEM(), $this->getHashAlgorithm());
return ECSignature::fromAsn1($signature, $this->getSignaturePartLength());
}
public function verify(string $data, Key $key, string $signature): bool
{
$key = $this->handleKey($key);
$publicKey = $key->toPublic();
$signature = ECSignature::toAsn1($signature, $this->getSignaturePartLength());
return 1 === openssl_verify($data, $signature, $publicKey->asPEM(), $this->getHashAlgorithm());
}
abstract protected function getCurve(): int;
abstract protected function getHashAlgorithm(): int;
abstract protected function getSignaturePartLength(): int;
private function handleKey(Key $key): Ec2Key
{
$key = new Ec2Key($key->getData());
Assertion::eq($key->curve(), $this->getCurve(), 'This key cannot be used with this algorithm');
return $key;
}
}
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