laipower/wp-content/plugins/wp-webauthn/vendor/web-token/jwt-signature-algorithm-eddsa/EdDSA.php

108 lines
2.9 KiB
PHP

<?php
declare(strict_types=1);
/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2020 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 Base64Url\Base64Url;
use function extension_loaded;
use function in_array;
use InvalidArgumentException;
use Jose\Component\Core\JWK;
use RuntimeException;
final class EdDSA implements SignatureAlgorithm
{
/**
* EdDSA constructor.
*
* @throws RuntimeException if the extension "sodium" is not available
*/
public function __construct()
{
if (!extension_loaded('sodium')) {
throw new RuntimeException('The extension "sodium" is not available. Please install it to use this method');
}
}
public function allowedKeyTypes(): array
{
return ['OKP'];
}
/**
* @throws InvalidArgumentException if the key is not private
* @throws InvalidArgumentException if the curve is not supported
*/
public function sign(JWK $key, string $input): string
{
$this->checkKey($key);
if (!$key->has('d')) {
throw new InvalidArgumentException('The EC key is not private');
}
$x = Base64Url::decode($key->get('x'));
$d = Base64Url::decode($key->get('d'));
$secret = $d.$x;
switch ($key->get('crv')) {
case 'Ed25519':
return sodium_crypto_sign_detached($input, $secret);
default:
throw new InvalidArgumentException('Unsupported curve');
}
}
/**
* @throws InvalidArgumentException if the curve is not supported
*/
public function verify(JWK $key, string $input, string $signature): bool
{
$this->checkKey($key);
$public = Base64Url::decode($key->get('x'));
switch ($key->get('crv')) {
case 'Ed25519':
return sodium_crypto_sign_verify_detached($signature, $input, $public);
default:
throw new InvalidArgumentException('Unsupported curve');
}
}
public function name(): string
{
return 'EdDSA';
}
/**
* @throws InvalidArgumentException if the key type is not valid
* @throws InvalidArgumentException if a mandatory key parameter is missing
* @throws InvalidArgumentException if the curve is not suuported
*/
private function checkKey(JWK $key): void
{
if (!in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
throw new InvalidArgumentException('Wrong key type.');
}
foreach (['x', 'crv'] as $k) {
if (!$key->has($k)) {
throw new InvalidArgumentException(sprintf('The key parameter "%s" is missing.', $k));
}
}
if ('Ed25519' !== $key->get('crv')) {
throw new InvalidArgumentException('Unsupported curve.');
}
}
}