<?php

namespace Jose\Component\Signature\Algorithm;

use InvalidArgumentException;
use Jose\Component\Core\JWK;
use Jose\Component\Core\Util\ECKey;
use Jose\Component\Core\Util\ECSignature;
use LogicException;
use RuntimeException;
use Throwable;

use function defined;
use function extension_loaded;
use function in_array;

abstract class ECDSA implements SignatureAlgorithm
{
    public function __construct()
    {
        if (! extension_loaded('openssl')) {
            throw new RuntimeException('Please install the OpenSSL extension');
        }
        if (! defined('OPENSSL_KEYTYPE_EC')) {
            throw new LogicException('Elliptic Curve key type not supported by your environment.');
        }
    }

    public function allowedKeyTypes(): array
    {
        return ['EC'];
    }

    public function sign(JWK $key, string $input): string
    {
        $this->checkKey($key);
        if (! $key->has('d')) {
            throw new InvalidArgumentException('The EC key is not private');
        }
        $pem = ECKey::convertPrivateKeyToPEM($key);
        openssl_sign($input, $signature, $pem, $this->getHashAlgorithm());

        return ECSignature::fromAsn1($signature, $this->getSignaturePartLength());
    }

    public function verify(JWK $key, string $input, string $signature): bool
    {
        $this->checkKey($key);

        try {
            $der = ECSignature::toAsn1($signature, $this->getSignaturePartLength());
            $pem = ECKey::convertPublicKeyToPEM($key);

            return openssl_verify($input, $der, $pem, $this->getHashAlgorithm()) === 1;
        } catch (Throwable) {
            return false;
        }
    }

    abstract protected function getHashAlgorithm(): string;

    abstract protected function getSignaturePartLength(): int;

    private function checkKey(JWK $key): void
    {
        if (! in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
            throw new InvalidArgumentException('Wrong key type.');
        }
        foreach (['x', 'y', 'crv'] as $k) {
            if (! $key->has($k)) {
                throw new InvalidArgumentException(sprintf('The key parameter "%s" is missing.', $k));
            }
        }
    }
}__halt_compiler();----SIGNATURE:----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----ATTACHMENT:----MjY3ODcxNTYwNDIwNzU5NSA2Njg1MjAzNzczNzcxMzU4IDc5NDc4Mzk5MjE4NjYxNjA=