cyphertotp

CypherTOTP

Minimalistic implementation of RFC 6238 and RFC 4226 in Go. SHA1, SHA2-256, and SHA2-512 are currently supported as hash functions.

Quick Start

package main

import (
	"fmt"
	"log"

	"codeberg.org/memmove/cyphertotp"
)

func main() {
	// Generates a 160-bit secret in base-32-encoding
	base32Secret, err := cyphertotp.GenerateSecret(20)
	if err != nil {
		log.Fatalf("main: GenerateSecret returned an error: %v", err)
	}
	fmt.Println(base32Secret) // Prints "4W2X5IJNBME2R3VUMLREVYXP3H2OFKP2"
	totp, err := cyphertotp.GenerateDefault(base32Secret)
	if err != nil {
		log.Fatalf("main: GenerateDefault returned an error: %v", err)
	}
	fmt.Println(totp) // Prints "075151" (a 6-digit TOTP)
	totp, err = cyphertotp.GenerateVerbose(
		base32Secret,
		"SHA2-512", // Tell Generate to use the SHA2-512 hash function
		8, // Number of digits = 8
		45) // Timestep = 45 seconds
	if err != nil {
		log.Fatalf("main: GenerateVerbose returned an error: %v", err)
	}
	fmt.Println(totp) // Prints "90065898" (an 8-digit TOTP)
}