src/org/average/nfcauthcr/NFCAuthCREnroll.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.NFCAuthCRCheck;
  19
  20 public class NFCAuthCREnroll 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                 Log.v(TAG, "Going inactive, try to stop");
  56                 if (!waitingForResult) { finish(); }
  57         }
  58
  59         @Override
  60         protected void onStop() {
  61                 super.onStop();
  62                 Log.v(TAG, "Stop requested");
  63         }
  64
  65         public void onSlotSelectionClicked(View view) {
  66                 Log.v(TAG, "Radio Button selected");
  67                 if (! ((RadioButton) view).isChecked()) return;
  68                 switch(view.getId()) {
  69                 case R.id.slot_1: slot=1; break;
  70                 case R.id.slot_2: slot=2; break;
  71                 }
  72                 Editor editor = prefs.edit();
  73                 editor.putInt("slot_number", slot);
  74                 editor.commit();
  75                 Log.v(TAG, "stored slot number " + slot);
  76         }
  77
  78         public void onEnrollClicked(View view) {
  79                 Log.v(TAG, "Enroll clicked");
  80                 if (slot > 0) {
  81                         runEnrollment(slot);
  82                 } else {
  83                         showEnrollResult("Must specify which slot to use");
  84                 }
  85         }
  86
  87         public void onActivityResult(int requestCode, int resultCode,
  88                                         Intent intent) {
  89                 Log.v(TAG, "Got activity result");
  90                 waitingForResult = false;
  91
  92                 if (resultCode != RESULT_OK) {
  93                         Log.v(TAG, "Error result code " + resultCode);
  94                         return;
  95                 }
  96                 byte[] challenge = intent.getByteArrayExtra("challenge");
  97                 Log.v(TAG, "Challenge is \"" + hex(challenge) + "\"");
  98                 byte[] response = intent.getByteArrayExtra("response");
  99                 Log.v(TAG, "Response is  \"" + hex(response) + "\"");
 100                 Editor editor = prefs.edit();
 101                 editor.putString("challenge", hex(challenge));
 102                 editor.putString("response", hex(response));
 103                 editor.commit();
 104                 Log.v(TAG, "stored new challenge and response");
 105         }
 106
 107         private void showEnrollResult(final String msg) {
 108                 Log.v(TAG, "Show result: \"" + msg + "\"");
 109
 110                 AlertDialog.Builder builder = new AlertDialog.Builder(this);
 111                 builder.setTitle(R.string.enrollresult);
 112                 builder.setMessage(msg);
 113                 builder.setPositiveButton(android.R.string.ok,
 114                                 new DialogInterface.OnClickListener() {
 115                         public void onClick(DialogInterface dialog, int which) {
 116                                 dialog.dismiss();
 117                                 if (!waitingForResult) { finish(); }
 118                         }
 119                 });
 120                 AlertDialog dialog = builder.create();
 121                 dialog.show();
 122         }
 123
 124         private void runEnrollment(int slot) {
 125                 Random rng = new Random();
 126                 byte[] challenge = new byte[63];
 127                 rng.nextBytes(challenge);
 128                 Log.v(TAG, "Random challenge: " + hex(challenge));
 129                 Log.v(TAG, "Launching challenging activity");
 130                 Intent crIntent = new Intent(this, NFCAuthCRCheck.class);
 131                 crIntent.putExtra("slot", slot);
 132                 crIntent.putExtra("challenge", challenge);
 133                 this.startActivityForResult(crIntent, 0);
 134                 waitingForResult = true;
 135         }
 136
 137         private String hex(byte[] a) {
 138                 StringBuilder sb = new StringBuilder();
 139                 if (a == null) return "<null>";
 140                 for (byte b: a) sb.append(String.format("%02x", b&0xff));
 141                 return sb.toString();
 142         }
 143 }