102 lines
2.9 KiB
PHP
102 lines
2.9 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Jose\Component\Signature\Algorithm;
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use function extension_loaded;
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use function in_array;
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use InvalidArgumentException;
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use function is_string;
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use Jose\Component\Core\JWK;
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use ParagonIE\ConstantTime\Base64UrlSafe;
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use RuntimeException;
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final class EdDSA implements SignatureAlgorithm
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{
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public function __construct()
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{
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if (! extension_loaded('sodium')) {
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throw new RuntimeException('The extension "sodium" is not available. Please install it to use this method');
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}
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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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/**
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* @return non-empty-string
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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 (! $key->has('d')) {
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throw new InvalidArgumentException('The EC key is not private');
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}
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$d = $key->get('d');
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if (! is_string($d) || $d === '') {
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throw new InvalidArgumentException('Invalid "d" parameter.');
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}
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if (! $key->has('x')) {
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$x = sodium_crypto_sign_publickey_from_secretkey($d);
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} else {
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$x = $key->get('x');
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}
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if (! is_string($x) || $x === '') {
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throw new InvalidArgumentException('Invalid "x" parameter.');
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}
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/** @var non-empty-string $x */
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$x = Base64UrlSafe::decode($x);
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/** @var non-empty-string $d */
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$d = Base64UrlSafe::decode($d);
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$secret = $d . $x;
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return match ($key->get('crv')) {
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'Ed25519' => sodium_crypto_sign_detached($input, $secret),
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default => throw new InvalidArgumentException('Unsupported curve'),
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};
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}
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/**
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* @param non-empty-string $signature
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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($key);
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$x = $key->get('x');
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if (! is_string($x)) {
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throw new InvalidArgumentException('Invalid "x" parameter.');
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}
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/** @var non-empty-string $public */
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$public = Base64UrlSafe::decode($x);
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return match ($key->get('crv')) {
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'Ed25519' => sodium_crypto_sign_verify_detached($signature, $input, $public),
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default => 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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private function checkKey(JWK $key): void
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{
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if (! in_array($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.', $k));
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}
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}
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if ($key->get('crv') !== 'Ed25519') {
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throw new InvalidArgumentException('Unsupported curve.');
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}
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}
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}
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