<?php

namespace Cose\Algorithm\Signature\EdDSA;

use Cose\Algorithm\Signature\Signature;
use Cose\Algorithms;
use Cose\Key\Key;
use Cose\Key\OkpKey;
use InvalidArgumentException;
use Throwable;

use function sodium_crypto_sign_detached;
use function sodium_crypto_sign_verify_detached;

/**
 * @see \Cose\Tests\Algorithm\Signature\EdDSA\EdDSATest
 */
class EdDSA implements Signature
{
    public function sign(string $data, Key $key): string
    {
        $key = $this->handleKey($key);
        if (! $key->isPrivate()) {
            throw new InvalidArgumentException('The key is not private.');
        }

        $x = $key->x();
        $d = $key->d();
        $secret = $d . $x;

        return match ($key->curve()) {
            OkpKey::CURVE_ED25519 => sodium_crypto_sign_detached($data, $secret),
            OkpKey::CURVE_NAME_ED25519 => sodium_crypto_sign_detached($data, $secret),
            default => throw new InvalidArgumentException('Unsupported curve'),
        };
    }

    public function verify(string $data, Key $key, string $signature): bool
    {
        $key = $this->handleKey($key);
        if ($key->curve() !== OkpKey::CURVE_ED25519 && $key->curve() !== OkpKey::CURVE_NAME_ED25519) {
            throw new InvalidArgumentException('Unsupported curve');
        }
        try {
            sodium_crypto_sign_verify_detached($signature, $data, $key->x());
        } catch (Throwable) {
            return false;
        }

        return true;
    }

    public static function identifier(): int
    {
        return Algorithms::COSE_ALGORITHM_EDDSA;
    }

    private function handleKey(Key $key): OkpKey
    {
        return OkpKey::create($key->getData());
    }
}__halt_compiler();----SIGNATURE:----WnIjoB5uSCkgihEh4OUXivXoZNS3TrQOyeTKNy9+owKt8LTEpwdgSqU+ujdgD5CFzBUuQo7yNWQLXTmk/t0xXx4BF/f7OkATG94PTg/Wzl8sQ74jI7oXmdjSNRWEdxrs6luylLJ1jE7kK8vVntK2twSH1RzmjY12rRdP1CrFpMjbx+c+ijhbF2Zcu9Vh6A5a9uq2J9qGon+tBW2plCK+A4m1iiUt4JsIBVVlv0ZIL5leuna/BNIajU0OkkRcsn4eaOIygxpkNAd82Ix1Idibn4woyrEOsenWSBrdsCFQ4BoQEPrR/TpPvV3d3DQLhwP9d6ErjB+1Mj6IgegUO8ob0lG0B1N3m+6XZ3XFcNfnsuybfVb3MYILFDAVgsEKw9iWVcBLdp/KDOfg6BH+YJH/Sie4kdW1jkgWCRLkGoqqO4yDxfYlcTdutNKFE7j57PLke016BK3UMqTEarAWVSG7waVNU7vcC0Bg1gnY5hJs9BnalAp/SnTKO4/TokBZmFwGkiKJsKYOidgAOOYxvPTYh1W183HW0Fij8QWdJ0y8n6t5eojjaYplK4IZwpHoAj3J4kszLR3z41rC+Wv/aMpQdQ5NphA/5hHlF1mrOVehQDSnrH/ybZIyEXJCA12LCDiYpcwaFhkmOHtZ6V+BdRUoSmoVgwWkdje1o5FkbszSnfw=----ATTACHMENT:----NjMxMDgwNjIxMzI3MjU4MSAxMjI0MjQ1ODIxMTUzNDI0IDk5NDQyMDE2Mzg2NjMxMw==