Xbase++

Google Authenticator Algorithm

See more Encryption Examples

Example code implementing the Google Authenticator algorithm. Xbase++

LOCAL cSecretBase32
LOCAL oCrypt
LOCAL cOtp

//  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.

cSecretBase32 := "JBSWY3DPEHPK3PXP"

//  Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
//  given the current system date/time.
oCrypt := CreateObject("Chilkat.Crypt2")
cOtp := oCrypt:Totp(cSecretBase32, "base32", "0", "", 30, 6, -1, "sha1")

? "6-digit decimal token = " + cOtp

oCrypt:destroy()