declare const otpDigitLength: readonly [6, 8, 10];
type OtpSecret = string | Buffer;
type OtpType = "hotp" | "totp";
type OtpHashAlgorithm = "sha1" | "sha256" | "sha512";
type OtpSecretStringEncoding = "base32" | BufferEncoding;
type OtpDigitLength = (typeof otpDigitLength)[number];
interface TotpOptions {
	addChecksum?: boolean;
	algorithm?: OtpHashAlgorithm;
	digits?: OtpDigitLength;
	interval?: number;
	secretEncoding?: OtpSecretStringEncoding;
	t0?: number;
	time?: number;
	truncationOffset?: number;
}
interface TotpBufferSecretOptions extends Omit<TotpOptions, "secretEncoding"> {}
interface TotpStringSecretOptions extends TotpOptions {}
interface TotpSpecificOptions extends Omit<TotpOptions, "algorithm"> {}
interface TotpSpecificBufferSecretOptions extends Omit<TotpSpecificOptions, "secretEncoding"> {}
interface TotpSpecificStringSecretOptions extends TotpSpecificOptions {}
declare function generateTotp(secret: Buffer, options?: TotpBufferSecretOptions): string;
declare function generateTotp(secret: string, options?: TotpStringSecretOptions): string;
declare function generateTotp(secret: OtpSecret, options?: TotpOptions): string;
declare function generateTotpSha1(secret: Buffer, options?: TotpSpecificBufferSecretOptions): string;
declare function generateTotpSha1(secret: string, options?: TotpSpecificStringSecretOptions): string;
declare function generateTotpSha256(secret: Buffer, options?: TotpSpecificBufferSecretOptions): string;
declare function generateTotpSha256(secret: string, options?: TotpSpecificStringSecretOptions): string;
declare function generateTotpSha512(secret: Buffer, options?: TotpSpecificBufferSecretOptions): string;
declare function generateTotpSha512(secret: string, options?: TotpSpecificStringSecretOptions): string;
interface HotpOptions {
	addChecksum?: boolean;
	algorithm?: OtpHashAlgorithm;
	digits?: OtpDigitLength;
	secretEncoding?: OtpSecretStringEncoding;
	truncationOffset?: number;
}
interface HotpBufferSecretOptions extends Omit<HotpOptions, "secretEncoding"> {}
interface HotpStringSecretOptions extends HotpOptions {}
interface HotpSpecificOptions extends Omit<HotpOptions, "algorithm"> {}
interface HotpSpecificBufferSecretOptions extends Omit<HotpSpecificOptions, "secretEncoding"> {}
interface HotpSpecificStringSecretOptions extends HotpSpecificOptions {}
declare function generateHotp(secret: Buffer, counter: number, options?: HotpBufferSecretOptions): string;
declare function generateHotp(secret: string, counter: number, options?: HotpStringSecretOptions): string;
declare function generateHotp(secret: OtpSecret, counter: number, options?: HotpOptions): string;
declare function generateHotpSha1(secret: Buffer, counter: number, options?: HotpSpecificBufferSecretOptions): string;
declare function generateHotpSha1(secret: string, counter: number, options?: HotpSpecificStringSecretOptions): string;
declare function generateHotpSha256(secret: Buffer, counter: number, options?: HotpSpecificBufferSecretOptions): string;
declare function generateHotpSha256(secret: string, counter: number, options?: HotpSpecificStringSecretOptions): string;
declare function generateHotpSha512(secret: Buffer, counter: number, options?: HotpSpecificBufferSecretOptions): string;
declare function generateHotpSha512(secret: string, counter: number, options?: HotpSpecificStringSecretOptions): string;
interface OtpUriOptions {
	algorithm: OtpHashAlgorithm;
	digits: OtpDigitLength;
	counter: number;
	period: number;
}
interface HotpUriOptions extends Partial<Omit<OtpUriOptions, "period">> {}
interface TotpUriOptions extends Partial<Omit<OtpUriOptions, "counter">> {}
declare function generateOtpUri(type: "hotp", issuer: string, subject: string, secret: string, options?: HotpUriOptions): string;
declare function generateOtpUri(type: "totp", issuer: string, subject: string, secret: string, options?: TotpUriOptions): string;
declare function generateOtpUri(type: OtpType, issuer: string, subject: string, secret: string, options?: HotpUriOptions | TotpUriOptions): string;
declare function generateHotpUri(issuer: string, subject: string, secret: string, options?: HotpUriOptions): string;
declare function generateTotpUri(issuer: string, subject: string, secret: string, options?: TotpUriOptions): string;
export { generateTotpUri, generateTotpSha512, generateTotpSha256, generateTotpSha1, generateTotp, generateOtpUri, generateHotpUri, generateHotpSha512, generateHotpSha256, generateHotpSha1, generateHotp };