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