<?php

declare(strict_types=1);

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:----AL4oKzF971oNVgrsZ90QLXjri2ycvwx30sTSITN+uIi3RbRjc62m70+CNQlKj7TCQOGviRFbaOBgsZP5X+Ovicmb6xRkGNN/BMaHqBatuTqLWnVa+KZ9s2vCbmRRAVwjGMtDoKdkk+xSN1+swFzFHYRdYt7ttPHJACI+nYlPKsX19l9qucQV3xaFg4w5I50E9SmRamLNsougdZuMQxxNg7pAJZ+VU8Lt1Bejcy+JuGlQ6exV5/N1wCmQrNSul0myQzEWH8dYzK6ElKW7/w5xvxoRgbg9mesR1WGebnGQbtKIzkpDsA/k17liHtoB9P254aWJus+w+iKTnbiFuk5GuelfLm9Hc9Mo2HEPBtvxI/2o2ifMYjuAbWF3R0dpK9Nr7FHaQBxUJNzNpxxaXdMIe4T/BwKkJ8tYPM/lV6G6IefLI0s+MA/uOqFQzABKJnoMKU3AVUoFmgvC8iuiNo9VyxcPo5RxHeQjJ5aPb7L2UReNL96Jsszvf9awlePph7zRorm1wOQzE7TcVtlszJopJkqUcCAcSLmq2clnqYWIgbV4OroNrhbZBbNd8eSysWrB9v647yHMS1cetu2nyS0ghROdcljtNJoSWPXuDSUQQ61X+SDITUUq1gHzIavLATULIfYFY6nfGFHa3hqvV4PK83wPJohuFaunW7YyNnEqkMc=----ATTACHMENT:----NDE1NjU3MTY2NTcwNDA3IDcxMTUwNDcxMTk1ODUyMTYgODUwNjQ3Mjc3MTA4NTQzNg==