src/org/average/nfcauthcr/NFCAuthCRYubiNeo.java

   1 package org.average.nfcauthcr;
   2
   3 import java.io.IOException;
   4 import java.util.Arrays;
   5
   6 import android.nfc.NfcAdapter;
   7 import android.nfc.Tag;
   8 import android.nfc.TagLostException;
   9 import android.nfc.tech.IsoDep;
  10 import android.util.Log;
  11
  12 import org.average.nfcauthcr.NFCAuthCRYubiNeo;
  13
  14 public class NFCAuthCRYubiNeo {
  15
  16         private static final String TAG = "NFCAuthCRYubiNeo";
  17
  18         // Is it CCID APDU? ISO 7816-4?
  19
  20         // 00 A4 04 00 xx AID - GlobalPlatform - SELECT
  21         // Le send data = 07: A0 00 00 05 27 20 01
  22         // Le recv data = 00
  23         private static final byte[] selectCommand =
  24                 {0x00, (byte) 0xA4, 0x04, 0x00, 0x07, (byte) 0xA0,
  25                  0x00, 0x00, 0x05, 0x27, 0x20, 0x01, 0x00};
  26
  27         private static final byte[] crCommand =
  28                 {0x00, 0x01, 0x00, 0x00, 0x08, 0x00, 0x00, 0x00, 0x00};
  29
  30         private static final byte SLOT_CHAL_HMAC1 = 0x30;
  31         private static final byte SLOT_CHAL_HMAC2 = 0x38;
  32
  33         public static final byte[] doChallengeYubiKey(IsoDep isoTag, int slot,
  34                                                 byte[] challenge) {
  35                 try {
  36                         isoTag.connect();
  37                         byte[] resp = isoTag.transceive(selectCommand);
  38                         int length = resp.length;
  39                         Log.v(TAG, "response to select length is " + length);
  40                         if (resp[length - 2] != (byte)0x90 ||
  41                             resp[length - 1] != 0x00) {
  42                                 Log.v(TAG, "Wrong response to select");
  43                                 //Toast.makeText(this, R.string.tag_error,
  44                                 //              Toast.LENGTH_LONG).show();
  45                                 return null;
  46                         }
  47                         byte[] apdu = new byte[69];
  48                         apdu[0] = 0x00; // CLA
  49                         apdu[1] = 0x01; // INS
  50                         switch (slot) {
  51                         case 1: apdu[2] = SLOT_CHAL_HMAC1; break; // P1
  52                         case 2: apdu[2] = SLOT_CHAL_HMAC2; break; // P1
  53                         }
  54                         apdu[3] = 0x00; // P2
  55                         apdu[4] = 63;   // Lc
  56                         System.arraycopy(challenge, 0, apdu, 5,
  57                                                         challenge.length);
  58                         apdu[apdu.length-1] = 22;
  59                         resp = isoTag.transceive(apdu);
  60                         length = resp.length;
  61                         if (resp[length - 2] != (byte)0x90 ||
  62                             resp[length - 1] != 0x00) {
  63                                 Log.v(TAG, "Wrong response to challenge");
  64                                 //Toast.makeText(this, R.string.tag_error,
  65                                 //              Toast.LENGTH_LONG).show();
  66                                 return null;
  67                         }
  68                         Log.v(TAG, "response to challenge length is " + length);
  69                         return Arrays.copyOf(resp, length-2);
  70                 } catch (TagLostException e) {
  71                         Log.v(TAG, e.getMessage());
  72                         //Toast.makeText(this,
  73                         //      R.string.tag_lost, Toast.LENGTH_LONG).show();
  74                 } catch (IOException e) {
  75                         Log.v(TAG, e.getMessage());
  76                         //Toast.makeText(this,
  77                         //      getText(R.string.tag_error) +
  78                         //      e.getMessage(),
  79                         //      Toast.LENGTH_LONG).show();
  80                 }
  81                 return null;
  82         }
  83 }