miladrahimi / php-jwt

namespace MiladRahimi\Jwt\Cryptography\Algorithms\Eddsa;

use MiladRahimi\Jwt\Cryptography\Signer;

use MiladRahimi\Jwt\Exceptions\SigningException;

use RuntimeException;

use SodiumException;

use function function_exists;

class EdDsaSigner implements Signer

{

    protected static string $name = 'EdDSA';

    protected string $privateKey;

    protected ?string $kid;

    public function __construct(string $privateKey, ?string $kid = null)

    {

        $this->privateKey = $privateKey;

        $this->kid = $kid;

    }

    /**

     * @inheritdoc

     */

    public function sign(string $message): string

    {

        if (function_exists('sodium_crypto_sign_detached')) {

            try {

                return sodium_crypto_sign_detached($message, $this->privateKey);

            } catch (SodiumException $e) {

                throw new SigningException("Cannot sign using Sodium extension", 0, $e);

            }

        }

        throw new RuntimeException('The sodium_crypto_sign_detached function is not available');

    }

    public function name(): string

    {

        return static::$name;

    }

    public function getPrivateKey(): string

    {

        return $this->privateKey;

    }

}