Go

Google Authenticator Algorithm

See more Encryption Examples

Example code implementing the Google Authenticator algorithm. Go

    // 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 := "JBSWY3DPEHPK3PXP"

    // Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
    // given the current system date/time.
    crypt := chilkat.NewCrypt2()
    otp := crypt.Totp(secretBase32,"base32","0","",30,6,-1,"sha1")

    fmt.Println("6-digit decimal token = ", *otp)

    crypt.DisposeCrypt2()