React Native

Google Authenticator Algorithm

See more Encryption Examples

Example code implementing the Google Authenticator algorithm. React Native

import { Crypt2 } from '@chilkat/react-native'

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.

  const secretBase32 = 'JBSWY3DPEHPK3PXP';

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

  console.log(`6-digit decimal token = ${otp}`);
}