Android™

HOTP Algorithm: HMAC-Based One-Time Password Algorithm

See more Encryption Examples

Demonstrates how to generate an HMAC one-time password (HOTP) as specified in RFC 4226.

Note: This example requires Chilkat v9.5.0.77 or greater.

Android™

// 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();

    //  Duplicate the following results from RFC 4226

    //  Appendix D - HOTP Algorithm: Test Values
    //  
    //    The following test data uses the ASCII string
    //    "12345678901234567890" for the secret:
    //  
    //    Secret = 0x3132333435363738393031323334353637383930
    //  
    //                      Truncated
    //    Count    Hexadecimal    Decimal        HOTP
    //    0        4c93cf18       1284755224     755224
    //    1        41397eea       1094287082     287082
    //    2         82fef30        137359152     359152
    //    3        66ef7655       1726969429     969429
    //    4        61c5938a       1640338314     338314
    //    5        33c083d4        868254676     254676
    //    6        7256c032       1918287922     287922
    //    7         4e5b397         82162583     162583
    //    8        2823443f        673399871     399871
    //    9        2679dc69        645520489     520489

    String secret = "12345678901234567890";
    int count;
    for (count = 0; count <= 9; count++) {
        String counterHex = crypt.encodeInt(count,8,false,"hex");
        String hotp = crypt.hotp(secret,"ascii",counterHex,6,-1,"sha1");
        Log.i(TAG, String.valueOf(count) + "  HOTP = " + hotp);
        }

    //  Output is:
    //  0  HOTP = 755224
    //  1  HOTP = 287082
    //  2  HOTP = 359152
    //  3  HOTP = 969429
    //  4  HOTP = 338314
    //  5  HOTP = 254676
    //  6  HOTP = 287922
    //  7  HOTP = 162583
    //  8  HOTP = 399871
    //  9  HOTP = 520489

  }

  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."
  }
}