import { Hmac } from "./crypto/hmac";
import { TOTPOptions } from "./totp.options";
/**
 * Generates TOTP code from secret key and options
 *
 * @export
 * @param {Hmac} hmac
 * @param {TOTPOptions} options
 * @return {Promise<string>}
 * @throws {Error} if HMAC algorithm is invalid. Use {@link HmacAlgorithm} to avoid this
 */
export declare function totp(hmac: Hmac, options: TOTPOptions): Promise<string>;