hotp

README

HOTP, TOTP (short-lived OTP values, which are desirable for enhanced security)

Usage

package main

import (
	"fmt"
	"github.com/kbukum/hotp"
)

func main() {
	totp := hotp.TOTP{
		OTP: hotp.OTP{
			SharedSecret: "Secret Key",
			Digits:       8,
			Crypto:hotp.SHA1,
		},
		StartTime: 0,
		TimeStep:  30,
	}
	fmt.Println(totp.Password())
}

REFERENCES

• RFC4226 https://tools.ietf.org/html/rfc4226
• RFC6238 https://tools.ietf.org/html/rfc6238

Documentation

Index

• Variables
• type Crypto
• type OTP
  • func (hotp *OTP) Password(counter int) string
• type TOTP
  • func (totp *TOTP) Password() string

Variables

var (
	DigitPowers = []int64{1, 10, 100, 1000, 10000, 100000, 1000000, 10000000, 100000000, 1000000000, 10000000000, 100000000000}
)

Types

type Crypto

type Crypto int

const (
	SHA1 Crypto = iota + 1
	SHA256
	SHA512
)

type OTP

type OTP struct {
	SharedSecret string
	Digits       int
	Crypto       Crypto
}

func (*OTP) Password

func (hotp *OTP) Password(counter int) string

type TOTP

type TOTP struct {
	OTP
	StartTime int64
	TimeStep  int64
}

func (*TOTP) Password

func (totp *TOTP) Password() string