import { HmacAlgorithm } from "./crypto/hmac";
import { SecretKey } from "./key";
export type HOTPOptions = {
    /**
     * Secret key
     */
    secret: SecretKey;
    /**
     * Incrementing counter. From 0 to Number.MAX_SAFE_INTEGER (53 bits)
     */
    counter: number;
    /**
     * 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;
};
/**
 *
 *
 * @export
 * @return {*}  {Required<HOTPOptions>}
 */
export declare function getDefaultHOTPOptions(): Required<HOTPOptions>;