77 lines
2.1 KiB
PHP
77 lines
2.1 KiB
PHP
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<?php
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declare(strict_types=1);
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/*
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* The MIT License (MIT)
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*
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* Copyright (c) 2014-2018 Spomky-Labs
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*
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* This software may be modified and distributed under the terms
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* of the MIT license. See the LICENSE file for details.
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*/
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namespace Jose\Component\Signature\Algorithm;
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use Base64Url\Base64Url;
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use Jose\Component\Core\JWK;
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final class EdDSA implements SignatureAlgorithm
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{
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public function allowedKeyTypes(): array
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{
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return ['OKP'];
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}
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public function sign(JWK $key, string $input): string
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{
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$this->checkKey($key);
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if (!$key->has('d')) {
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throw new \InvalidArgumentException('The key is not private.');
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}
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$x = Base64Url::decode($key->get('x'));
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$d = Base64Url::decode($key->get('d'));
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$secret = $d.$x;
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switch ($key->get('crv')) {
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case 'Ed25519':
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return \sodium_crypto_sign_detached($input, $secret);
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default:
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throw new \InvalidArgumentException('Unsupported curve');
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}
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}
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public function verify(JWK $key, string $input, string $signature): bool
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{
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$this->checkKey($key);
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$public = Base64Url::decode($key->get('x'));
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switch ($key->get('crv')) {
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case 'Ed25519':
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return \sodium_crypto_sign_verify_detached($signature, $input, $public);
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default:
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throw new \InvalidArgumentException('Unsupported curve');
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}
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}
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private function checkKey(JWK $key)
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{
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if (!\in_array($key->get('kty'), $this->allowedKeyTypes(), true)) {
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throw new \InvalidArgumentException('Wrong key type.');
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}
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foreach (['x', 'crv'] as $k) {
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if (!$key->has($k)) {
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throw new \InvalidArgumentException(\sprintf('The key parameter "%s" is missing.', $k));
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}
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}
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if (!\in_array($key->get('crv'), ['Ed25519'], true)) {
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throw new \InvalidArgumentException('Unsupported curve.');
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}
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}
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public function name(): string
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{
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return 'EdDSA';
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}
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}
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