(Android™) Generate TOTP using Base32 Secret (6 Digits, Time-based, 30-second period)

Generates a 6-digit time-based TOTP code using a base32 secret with a 30-second time period.

Chilkat Android™ Downloads Android™ Java Libraries Android C/C++ Libraries

// Important: Don't forget to include the call to System.loadLibrary
// as shown at the bottom of this code sample.
package com.test;

import android.app.Activity;
import com.chilkatsoft.*;

import android.widget.TextView;
import android.os.Bundle;

public class SimpleActivity extends Activity {

  private static final String TAG = "Chilkat";

  // Called when the activity is first created.
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.
    // 
    CkCrypt2 crypt = new CkCrypt2();

    // Base32 secret key:
    String secretKey = "oebf ytfl qmzb p4xd 2ztf zyz4 hjrw 3uyo";

    CkStringBuilder sbKey = new CkStringBuilder();
    boolean success = sbKey.Append(secretKey);

    // Remove SPACE chars.
    int numRemoved = sbKey.Replace(" ","");

    // Note: A new token is generated every 30 seconds.  You must generate within the same 30 second interval to get the same result.

    // Generate 6 digits.
    int numDigits = 6;
    // 30 second time period.
    int timePeriod = 30;
    Log.i(TAG, "Your token is: " + crypt.totp(sbKey.getAsString(),"base32","0","",timePeriod,numDigits,-1,"sha1"));

  }

  static {
      System.loadLibrary("chilkat");

      // Note: If the incorrect library name is passed to System.loadLibrary,
      // then you will see the following error message at application startup:
      //"The application <your-application-name> has stopped unexpectedly. Please try again."
  }
}