Node.js

Google Authenticator Algorithm

See more Encryption Examples

Example code implementing the Google Authenticator algorithm. Node.js

NODEJS_PRELUDE

function 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.

    var secretBase32 = "JBSWY3DPEHPK3PXP";

    // Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
    // given the current system date/time.
    var crypt = new chilkat.Crypt2();
    var otp = crypt.Totp(secretBase32,"base32","0","",30,6,-1,"sha1");

    console.log("6-digit decimal token = " + otp);

}

chilkatExample();