import { HmacAlgorithm } from "./crypto/hmac";
import { SecretKey } from "./key";
export type TOTPOptions = {
    /**
     * Secret key
     */
    secret: SecretKey;
    /**
     * Interval in seconds between code generation
     * - Any other than `30` is not supported by Google Authenticator
     * @default 30
     */
    stepSeconds?: number;
    /**
     * Current date
     * @default Date()
     */
    now?: Date;
    /**
     * Count of digits.
     * - Any other than `6` is not supported by Google Authenticator
     * @default 6
     */
    digits?: number;
    /**
     * Hash algorithms for generating new codes.
     * - Any other than `sha1` is not supported by Google Authenticator
     * @default "sha1"
     */
    algorithm?: HmacAlgorithm;
    /**
     * Enables padding of secret key.
     * - `true` - compatible with [RFC6238](https://www.ietf.org/rfc/rfc6238.txt)
     * - `false` - compatible with Google Authenticator
     *
     * @default false
     */
    pad?: boolean;
};
/**
 *
 *
 * @export
 * @return {*}  {Required<TOTPOptions>}
 */
export declare function getDefaultTOTPOptions(): Required<TOTPOptions>;