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