Set the JWS Protected Header

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetProtectedHeader, which sets the integrity-protected header for a signer from a JsonObject. The header specifies the signature algorithm (alg).

// 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);

    boolean success = false;

    CkJws jws = new CkJws();

    //  Build the JWS protected header.  The "alg" member names the signature algorithm.
    CkJsonObject header = new CkJsonObject();
    header.UpdateString("alg","HS256");

    //  Set the protected header for signer index 0.  The protected header is integrity-protected: it is
    //  covered by the signature.
    success = jws.SetProtectedHeader(0,header);
    if (success == false) {
        Log.i(TAG, jws.lastErrorText());
        return;
        }

    Log.i(TAG, "Protected header set.");

  }

  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."
  }
}