<?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:----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----ATTACHMENT:----Nzk2MjIyOTM0MTAyMDUxOCAzNDI1OTE1NzY3MzM4NzUyIDY5ODMxMDE1NDk2MzQzMDI=