go-totp

Package go-totp library implements functionalities to create and validate Time-Based One-Time Password (TOTP) for Two-Factor Authentication (2FA) applications.

TOTP generates temporary codes based on a shared secret key, enhancing security.

Installation

Use go get

go get -u github.com/FuLygon/go-totp/v2

Import package

import "github.com/FuLygon/go-totp/v2"

Documentation

Example

See Example

Usage

Create TOTP

Generate or define a TOTP instance

t, err := totp.New(totp.TOTP{
    AccountName: "your_account_name",
    Issuer:      "your_issuer_name",
})
if err != nil {
    // handle error
    log.Println("error generating QR code:", err)
    return
}

// optionally, define TOTP details:
t := totp.TOTP{
    AccountName: "your_account_name",
    Issuer:      "your_issuer_name",
    Algorithm:   totp.AlgorithmSHA1,
    Digits:      6,
    Period:      30,
    Secret:      "your_shared_secret",
}

Generate TOTP URL and QR code

// generate TOTP URL
url, err := t.GetURL()
if err != nil {
    // handle error
    log.Println("error generating TOTP URL:", err)
    return
}
fmt.Println("TOTP URL:", url)

// generate QR code
qr, err := t.GetQR(256)
if err != nil {
    // handle error
    log.Println("error generating QR code:", err)
    return
}
fmt.Println("QR Code Base64:", qr.Base64)

Validating TOTP code

Create a validator instance

v := totp.Validator{
  Algorithm: totp.AlgorithmSHA1,
  Digits:    6,
  Period:    30,
  Secret:    "your_shared_secret",
}

Validate TOTP code

code := "123456" // user-provided TOTP code

valid, err := v.Validate(code)
if err != nil {
    // handle error
    log.Println("error validating TOTP code:", err)
    return
}

if valid {
    fmt.Println("TOTP code is valid!")
} else {
    fmt.Println("TOTP code is invalid.")
}