OTP Generator for Go

This Go package provides a simple implementation for generating One-Time Passwords (OTP) based on the HMAC-based One-Time Password Algorithm (HOTP) and Time-Based One-Time Password Algorithm (TOTP) as described in RFC 4226 and RFC 6238.

Usage

package main

import (
	"crypto/sha1"
	"fmt"
	"time"

	"github.com/GabiBizdoc/golang-playground/pgk/otp"
)

func main() {
	secret := "<your base32 key"
	code, _ := otp.GenerateTOTP(secret)
	token := code.TakeDigitsString(6)
	expireIn := time.Until(code.ExpireAt)
	
	fmt.Println(token, expireIn)
	
	var rawSecret []byte
	bincode, _ := otp.GenerateTimeBasedOTP(sha1.New, rawSecret, 30)
	token = bincode.TakeDigitsString(6)
	
	fmt.Println(token)
}

link example otpauth://totp/application%20name?secret=123456567890&issuer=12323123123&algorithm=SHA1&digits=8&period=60