<?php

declare(strict_types=1);

namespace Jose\Component\Encryption\Algorithm\KeyEncryption;

use AESKW\Wrapper as WrapperInterface;
use RuntimeException;

abstract class AbstractECDHAESKW implements KeyAgreementWithKeyWrapping
{
    public function __construct()
    {
        if (! interface_exists(WrapperInterface::class)) {
            throw new RuntimeException('Please install "spomky-labs/aes-key-wrap" to use AES-KW algorithms');
        }
    }

    public function allowedKeyTypes(): array
    {
        return ['EC', 'OKP'];
    }

    public function getKeyManagementMode(): string
    {
        return self::MODE_WRAP;
    }

    abstract protected function getWrapper(): WrapperInterface;

    abstract protected function getKeyLength(): int;
}