Android™

Load JWK into PublicKey Object

See more JSON Web Signatures (JWS) Examples

Demonstrates how to load a Java Web Key (JWK) into a Chilkat public key object. 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);

    boolean success = false;

    // Imagine we have this JWK:

    // {
    // "kty":"RSA",
    // "kid":"bilbo.baggins@hobbiton.example",
    // "use":"sig",
    // "n":"26381066103266289976070039679240841999340706859156341823971393693544846472963839705790075117105560154606562987481050889935247188300178764426769543782451174831475924241862817098997865881169498995546309260357488285676768114714548754913374731868063116787903918383610614912211576698081222844057810710088656983077876282582286966085572172471849443305250452393766960762340311496052418952315081937000716222751229644449475751932222180738210988190709824209639002026650048655399108647971010890335494074025258268035713167380057822555485524738518699437692145859633592396626258745090144803752145540471688039673495588314804430463791",
    // "e":"65537"
    // }
    // 

    CkStringBuilder sbJwk = new CkStringBuilder();
    success = sbJwk.LoadFile("qa_data/jwk/simple_jwk_rsa.json","utf-8");
    if (success != true) {
        Log.i(TAG, "Failed to load simple JWK file.");
        return;
        }

    // Loading it into a Chilkat public key object is easy:
    CkPublicKey pubkey = new CkPublicKey();
    success = pubkey.LoadFromString(sbJwk.getAsString());
    if (success == false) {
        Log.i(TAG, pubkey.lastErrorText());
        return;
        }

    Log.i(TAG, "Simple JWK loaded into public key object.");

    // ----------------------------------------------------------------------------------------------------------
    // Demonstrate how to load a JWK that is contained within JSON into a public key object.

    // {
    //   "alg":"RS256",
    //   "jwk":  {
    //           "kty":"RSA",
    //           "kid":"bilbo.baggins@hobbiton.example",
    //           "use":"sig",
    //           "n":"26381066103266289976070039679240841999340706859156341823971393693544846472963839705790075117105560154606562987481050889935247188300178764426769543782451174831475924241862817098997865881169498995546309260357488285676768114714548754913374731868063116787903918383610614912211576698081222844057810710088656983077876282582286966085572172471849443305250452393766960762340311496052418952315081937000716222751229644449475751932222180738210988190709824209639002026650048655399108647971010890335494074025258268035713167380057822555485524738518699437692145859633592396626258745090144803752145540471688039673495588314804430463791",
    //           "e":"65537"
    //           }
    // }

    CkStringBuilder sbJwk2 = new CkStringBuilder();
    success = sbJwk2.LoadFile("qa_data/jwk/contained_jwk_rsa.json","utf-8");
    if (success == false) {
        Log.i(TAG, sbJwk2.lastErrorText());
        return;
        }

    // Get the "jwk" part of the JSON..
    CkJsonObject json = new CkJsonObject();
    json.Load(sbJwk2.getAsString());

    CkJsonObject jsonJwk = new CkJsonObject();
    success = json.ObjectOf2("jwk",jsonJwk);
    if (success == false) {
        Log.i(TAG, json.lastErrorText());
        return;
        }

    CkPublicKey pubkey2 = new CkPublicKey();
    success = pubkey2.LoadFromString(jsonJwk.emit());
    if (success == false) {
        Log.i(TAG, pubkey2.lastErrorText());
        return;
        }

    Log.i(TAG, "Contained JWK loaded into public key object.");

  }

  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."
  }
}