declare function generateTotpSecret(byteLength?: number): string;
declare function buildOtpauthUrl(options: {
    secret: string;
    account: string;
    issuer?: string;
}): string;
declare function generateTotp(secret: string, counter?: number, digits?: number): string;
declare function verifyTotp(secret: string, token: string, window?: number): boolean;
export { buildOtpauthUrl, generateTotp, generateTotpSecret, verifyTotp };