<?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:----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----ATTACHMENT:----MzY2NTkzNzI3MzE4MTIwNiA0NzY1MjY5MzQ5Mjg0MjM2IDcyMzg5OTY3MzMwNzE0NDg=