Android Open Source - dCache-Cloud Share With Friend Activity

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License

The source code is released under:

Copyright ? 2013, Michael Stapelberg and contributors All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following ...

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Java Source Code

package de.desy.dCacheCloud.Activities;
/*from  w  ww.j  a  v  a  2 s  . c  om*/
import java.security.PublicKey;
import java.util.List;

import javax.crypto.SecretKey;

import org.json.JSONException;
import org.json.JSONObject;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Base64;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import de.desy.dCacheCloud.CryptoHelper;
import de.desy.dCacheCloud.DatabaseHelper;
import de.desy.dCacheCloud.KeyStoreHelper;
import de.desy.dCacheCloud.R;

public class ShareWithFriendActivity extends Activity implements OnItemClickListener {

  private DatabaseHelper dbh = null;
  private ListView lvFriends = null;
  private boolean friendsFound = true;
  private String fileName = "";
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    setContentView(R.layout.file_list);
    dbh = new DatabaseHelper(getApplicationContext());
    lvFriends = (ListView) findViewById(R.id.listView1);
    lvFriends.setOnItemClickListener(this);
    fileName = getIntent().getStringExtra("fileName");
    
    super.onCreate(savedInstanceState);
  }

  @Override
  protected void onResume() {
    List<String> friends  = dbh.getAllFriends();
    
    if (friends.size() == 0)
    {
      friendsFound = false;
      friends.add("no friends found");
    }
    
    lvFriends.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, friends));
    super.onResume();
  }

  @Override
  public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
    // if no friends were found, then the message cant be clicked!
    if (!friendsFound)
      return;
    
    PublicKey usersPublic = dbh.getPersonPublicKey(lvFriends.getItemAtPosition(position).toString());
    share(usersPublic);
  }
  
  private void share(PublicKey key)
  {
    SecretKey fileAESKey = KeyStoreHelper.getKey(fileName);
    
    JSONObject json = new JSONObject();
    try
    {
      json.put("name", fileName);
      json.put("key", Base64.encode(fileAESKey.getEncoded(), Base64.DEFAULT));
    }
    catch (JSONException e)
    {
      e.printStackTrace();
    }
    
    String message = json.toString();
    String messageHash = CryptoHelper.hash(message);
    
    // TODO: signature lenght = 1024?
    byte[] signature = CryptoHelper.encryptAsymmetric(messageHash, true, KeyStoreHelper.getOwnPriv());
    // TODO: String + byte[] ?!? --> what happened here?
    byte[] encrypted = CryptoHelper.encryptAsymmetric(message + signature, false, key);
    String ownPubHash = CryptoHelper.hash(CryptoHelper.PublicKeyToString(KeyStoreHelper.getOwnPub()));
    
    String output = Base64.encodeToString(encrypted, Base64.DEFAULT);
    output += ownPubHash;
//    Toast.makeText(getApplicationContext(), output, Toast.LENGTH_LONG).show();
    
    Intent intent = new Intent(getApplicationContext(), ShareDataActivity.class);
    intent.putExtra("DATA", output);
    startActivity(intent);
    finish();
    
    return;
  }
}

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