Encrypt a JWE with a Symmetric Wrapping Key

See more JSON Web Encryption (JWE) Examples

Demonstrates Jwe.SetWrappingKey, which sets the symmetric key-wrapping key for a recipient. The key bytes are supplied in a named encoding such as hex or base64.

// 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;

    CkJwe jwe = new CkJwe();

    //  Protected header: AES key-wrap with AES-256-GCM content encryption.
    CkJsonObject header = new CkJsonObject();
    header.UpdateString("alg","A256KW");
    header.UpdateString("enc","A256GCM");
    success = jwe.SetProtectedHeader(header);
    if (success == false) {
        Log.i(TAG, jwe.lastErrorText());
        return;
        }

    //  Set the symmetric key-wrapping key for recipient 0.  The key bytes are provided in the named
    //  encoding (here base64).  In production, obtain the key from a secure source rather than hard-coding
    //  it.
    String base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU=";
    success = jwe.SetWrappingKey(0,base64Key,"base64");
    if (success == false) {
        Log.i(TAG, jwe.lastErrorText());
        return;
        }

    String jweCompact = jwe.encrypt("This is the secret content.","utf-8");
    if (jwe.get_LastMethodSuccess() == false) {
        Log.i(TAG, jwe.lastErrorText());
        return;
        }

    Log.i(TAG, jweCompact);

  }

  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."
  }
}