export interface ToTpGeneratorOptions {
    digits?: number;
    period?: number;
    algorithm?: "SHA-1" | "SHA-256" | "SHA-512";
    label?: string;
    secretLength?: number;
    issuer: string;
}
export interface ToTpSecretAndUrl {
    url: string;
    secret: string;
}
export declare class TotpChecker {
    static ValidateTotp(totpSecret: string | null, code: string | undefined): Promise<boolean>;
    static EncodeBase32(input: Buffer): string;
    static GenerateCode(optionsOrIssuer: ToTpGeneratorOptions | string): ToTpSecretAndUrl;
}
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