PureBasic

Google Authenticator Algorithm

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Example code implementing the Google Authenticator algorithm. PureBasic

IncludeFile "CkCrypt2.pb"

Procedure ChilkatExample()

    ; 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.

    secretBase32.s = "JBSWY3DPEHPK3PXP"

    ; Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
    ; given the current system date/time.
    crypt.i = CkCrypt2::ckCreate()
    If crypt.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    otp.s = CkCrypt2::ckTotp(crypt,secretBase32,"base32","0","",30,6,-1,"sha1")

    Debug "6-digit decimal token = " + otp


    CkCrypt2::ckDispose(crypt)


    ProcedureReturn
EndProcedure