src/org/average/nfcauthcr/Enroll.java

   1 package org.average.nfcauthcr;
   2
   3 import java.util.Random;
   4
   5 import android.os.Bundle;
   6 import android.app.Activity;
   7 import android.app.AlertDialog;
   8 import android.preference.PreferenceManager;
   9 import android.content.Intent;
  10 import android.content.SharedPreferences;
  11 import android.content.SharedPreferences.Editor;
  12 import android.content.DialogInterface;
  13 import android.util.Log;
  14 import android.view.View;
  15 import android.widget.TextView;
  16 import android.widget.RadioButton;
  17
  18 import org.average.nfcauthcr.TagEvent;
  19
  20 public class Enroll extends Activity {
  21
  22         private final String TAG = getClass().getName();
  23
  24         private static boolean waitingForResult = false;
  25         private static SharedPreferences prefs;
  26         private static int slot;
  27
  28         @Override
  29         protected void onCreate(Bundle savedInstanceState)
  30         {
  31                 super.onCreate(savedInstanceState);
  32                 Log.v(TAG, "Starting");
  33                 prefs = PreferenceManager.getDefaultSharedPreferences(this);
  34         }
  35
  36         @Override
  37         protected void onResume() {
  38                 super.onResume();
  39                 setContentView(R.layout.main);
  40                 slot = prefs.getInt("slot_number", -1);
  41                 Log.v(TAG, "found saved slot value " + slot);
  42                 RadioButton btn = null;
  43                 switch (slot) {
  44                 case 1: btn = (RadioButton)findViewById(R.id.slot_1);
  45                         break;
  46                 case 2: btn = (RadioButton)findViewById(R.id.slot_2);
  47                         break;
  48                 }
  49                 if (btn != null) btn.setChecked(true);
  50         }
  51
  52         @Override
  53         protected void onPause() {
  54                 super.onPause();
  55         }
  56
  57         @Override
  58         protected void onStop() {
  59                 super.onStop();
  60                 Log.v(TAG, "Stop requested");
  61         }
  62
  63         public void onSlotSelectionClicked(View view) {
  64                 Log.v(TAG, "Radio Button selected");
  65                 if (! ((RadioButton) view).isChecked()) return;
  66                 switch(view.getId()) {
  67                 case R.id.slot_1: slot=1; break;
  68                 case R.id.slot_2: slot=2; break;
  69                 }
  70                 Editor editor = prefs.edit();
  71                 editor.putInt("slot_number", slot);
  72                 editor.commit();
  73                 Log.v(TAG, "stored slot number " + slot);
  74         }
  75
  76         public void onEnrollClicked(View view) {
  77                 Log.v(TAG, "Enroll clicked");
  78                 if (slot > 0) {
  79                         runEnrollment(slot);
  80                 } else {
  81                         showEnrollResult(R.string.need_slot);
  82                 }
  83         }
  84
  85         public void onActivityResult(int requestCode, int resultCode,
  86                                         Intent intent) {
  87                 Log.v(TAG, "Got activity result");
  88                 waitingForResult = false;
  89
  90                 if (resultCode != RESULT_OK) {
  91                         Log.v(TAG, "Error result code " + resultCode);
  92                         return;
  93                 }
  94                 byte[] challenge = intent.getByteArrayExtra("challenge");
  95                 Log.v(TAG, "Challenge is \"" + hex(challenge) + "\"");
  96                 byte[] response = intent.getByteArrayExtra("response");
  97                 Log.v(TAG, "Response is  \"" + hex(response) + "\"");
  98                 Editor editor = prefs.edit();
  99                 editor.putString("challenge", hex(challenge));
 100                 editor.putString("response", hex(response));
 101                 editor.commit();
 102                 showEnrollResult(R.string.enroll_success);
 103                 Log.v(TAG, "stored new challenge and response");
 104         }
 105
 106         private void showEnrollResult(int messageid) {
 107                 AlertDialog.Builder builder = new AlertDialog.Builder(this);
 108                 builder.setTitle(R.string.enrollresult);
 109                 builder.setMessage(messageid);
 110                 builder.setPositiveButton(android.R.string.ok,
 111                                 new DialogInterface.OnClickListener() {
 112                         public void onClick(DialogInterface dialog, int which) {
 113                                 dialog.dismiss();
 114                                 if (!waitingForResult) { finish(); }
 115                         }
 116                 });
 117                 AlertDialog dialog = builder.create();
 118                 dialog.show();
 119         }
 120
 121         private void runEnrollment(int slot) {
 122                 Random rng = new Random();
 123                 byte[] challenge = new byte[63];
 124                 rng.nextBytes(challenge);
 125                 Log.v(TAG, "Random challenge: " + hex(challenge));
 126                 Intent crIntent = new Intent(this, TagEvent.class);
 127                 crIntent.putExtra("yubikey_neo_slot", slot);
 128                 crIntent.putExtra("challenge", challenge);
 129                 waitingForResult = true;
 130                 this.startActivityForResult(crIntent, 0);
 131         }
 132
 133         private String hex(byte[] a) {
 134                 StringBuilder sb = new StringBuilder();
 135                 if (a == null) return "<null>";
 136                 for (byte b: a) sb.append(String.format("%02x", b&0xff));
 137                 return sb.toString();
 138         }
 139 }