Android™

HMAC SHA-1 Matching FIPS Examples

See more Encryption Examples

Provides an example of computing an HMAC-SHA1 digest to duplicate the FIPS examples at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf 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 assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkCrypt2 crypt = new CkCrypt2();

    String strToSign = "Sample #1";

    // 64-byte key
    String key = "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f";

    // The expected result:
    // (from Appendix A.1 at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf )
    String expectedResult = "4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a";

    // Here is the code to duplicate the results:
    crypt.put_HashAlgorithm("sha-1");
    crypt.put_EncodingMode("hex");
    crypt.put_MacAlgorithm("hmac");

    crypt.SetMacKeyEncoded(key,"hex");

    String mac;
    mac = crypt.macStringENC(strToSign);

    Log.i(TAG, "Computed: " + mac);
    Log.i(TAG, "Expected: " + expectedResult);

  }

  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."
  }
}