(Swift 2) Google Authenticator Algorithm

Example code implementing the Google Authenticator algorithm.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // 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.

    var secretBase32: String? = "JBSWY3DPEHPK3PXP"

    // Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
    // given the current system date/time.
    let crypt = CkoCrypt2()
    var otp: String? = crypt.Totp(secretBase32, secretEnc: "base32", t0: "0", tNow: "", tStep: 30, numDigits: 6, truncOffset: -1, hashAlg: "sha1")

    print("6-digit decimal token = \(otp!)")

}