(Node.js) Google Authenticator Algorithm

Example code implementing the Google Authenticator algorithm.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

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();