(Visual FoxPro) Google Authenticator Algorithm

Example code implementing the Google Authenticator algorithm.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL lcSecretBase32
LOCAL loCrypt
LOCAL lcOtp

* 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.

lcSecretBase32 = "JBSWY3DPEHPK3PXP"

* Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
* given the current system date/time.
* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Crypt2')
loCrypt = CreateObject('Chilkat.Crypt2')
lcOtp = loCrypt.Totp(lcSecretBase32,"base32","0","",30,6,-1,"sha1")

? "6-digit decimal token = " + lcOtp

RELEASE loCrypt