Jose\Component\Signature\Algorithm\ECDSA

Complexity

Total Complexity

11

Size/Duplication

Total Lines	72
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	3

Importance

Changes

0

6 Methods

Rating	Name	Duplication	Size	Complexity
A	__construct()	0	6	2
A	sign()	0	15	3
A	verify()	0	12	2
	getHashAlgorithm()	0	1	?
	getSignaturePartLength()	0	1	?
A	checkKey()	0	11	4

<?php

declare(strict_types=1);

/*
 * The MIT License (MIT)
 *
 * Copyright (c) 2014-2017 Spomky-Labs
 *
 * This software may be modified and distributed under the terms
 * of the MIT license.  See the LICENSE file for details.
 */

namespace Jose\Component\Signature\Algorithm;

use Jose\Component\Core\JWK;
use Jose\Component\Core\Util\ECSignature;
use Jose\Component\Core\Util\ECKey;
use Jose\Component\Signature\SignatureAlgorithmInterface;

/**
 * Class ECDSA.
 */
abstract class ECDSA implements SignatureAlgorithmInterface
{
    /**
     * ECDSA constructor.
     */
    public function __construct()
    {
        if (!defined('OPENSSL_KEYTYPE_EC')) {
            throw new \RuntimeException('Elliptic Curve key type not supported by your environment.');
        }
    }

    /**
     * {@inheritdoc}
     */
    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);
        $result = openssl_sign($input, $signature, $pem, $this->getHashAlgorithm());
        if (false === $result) {
            throw new \RuntimeException('Signature failed.');
        }

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

    /**
     * {@inheritdoc}
     */
    public function verify(JWK $key, string $input, string $signature): bool
    {
        $this->checkKey($key);
        try {
            $der = ECSignature::toDER($signature, $this->getSignaturePartLength());
            $pem = ECKey::convertPublicKeyToPEM($key);
            return 1 === openssl_verify($input, $der, $pem, $this->getHashAlgorithm());

        } catch (\Exception $e) {
            return false;
        }
    }

    /**
     * @return string
     */
    abstract protected function getHashAlgorithm(): string;

    /**
     * @return int
     */
    abstract protected function getSignaturePartLength(): int;

    /**
     * @param JWK $key
     */
    private function checkKey(JWK $key)
    {
        if ('EC' !== $key->get('kty')) {
            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));
            }
        }
    }
}