Lua

Google Authenticator Algorithm

See more Encryption Examples

Example code implementing the Google Authenticator algorithm. Lua

local chilkat = require("chilkat")

-- This example assumes the Chilkat API to have been previously unlocked.
-- See Global Unlock Sample for sample code.

-- Generating TOTP Base32 Secret:
-- When you enable 2FA with a TOTP-based authenticator app, Google will provide you with a QR code
-- that you can scan using the app. This QR code contains a TOTP base32 secret.
-- You can also choose to view and copy the secret manually.

local secretBase32 = "JBSWY3DPEHPK3PXP"

-- Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
-- given the current system date/time.
local crypt = chilkat.Crypt2.new()
local otp = crypt:totp(secretBase32, "base32", "0", "", 30, 6, -1, "sha1")

print("6-digit decimal token = " .. otp)