/*
* Potentially useful links
* https://stackoverflow.com/questions/36270238/android-nfc-ndef-writendefmessage-throws-ioexception-and-erases-tag-data
* https://stackoverflow.com/questions/40288795/android-nfca-connect-nfca-transceive-nfca-settimeout-and-nfca-getmaxtran
* https://stackoverflow.com/questions/29718618/get-the-data-payload-of-a-tag
* https://stackoverflow.com/questions/42819027/nfca-transceive-commands-documentation-nfc-a-iso-14443-3a*
*/
public void Callback(object obj)
{
if (obj is Intent intent)
{
Logging.Log(LogType.Information, $"Callback object is of type 'Intent'");
Tag rawTag = intent.GetParcelableExtra(NfcAdapter.ExtraTag) as Tag;
NfcA tag = NfcA.Get(rawTag);
tag.Connect();
byte[] result = tag.Transceive(CommandFactory.Instance().GetByteCommand(NfcByteCommand.Select));
if (!(result[0] == (byte)0x90 && result[1] == (byte)0x00))
{
throw new IOException("could not select applet");
}
result = tag.Transceive(CommandFactory.Instance().GetByteCommand(NfcByteCommand.GetString));
int len = result.Length;
if (!(result[len - 2] == (byte)0x90 && result[len - 1] == (byte)0x00))
{
throw new RuntimeException("could not retrieve msisdn");
}
byte[] data = new byte[len - 2];
Array.Copy(result, data, len - 2);
var str = Encoding.Default.GetString(data).Trim();
tag.Close();
}
}
private bool isMIFARETag(Tag tag)
{
bool returnVar = false;
ArrayList arr = new ArrayList();
arr.AddRange(tag.GetTechList());
if (arr.Contains("android.nfc.tech.NfcA"))
{
NfcA nfc_A = NfcA.Get(tag);
byte[] atqa = nfc_A.GetAtqa();
int Sak = int.Parse(nfc_A.Sak.ToString());
switch (atqa[1])
{
case 0x00:
if (atqa[0] == 0x44 || atqa[0] == 0x42 ||
atqa[0] == 0x02 || atqa[0] == 0x04)
{
if (Sak == 0x20)
{
returnVar = true;
detectedTag = "MIFARE_PLUS_SL3";
}
else if (Sak == 0x10)
{
returnVar = true;
detectedTag = "MIFARE_PLUS_SL2";
}
}
break;
case 0x03:
if (atqa[0] == 0x44 || atqa[0] == 0x4)
{
returnVar = true;
detectedTag = "MIFARE_DESFIRE";
}
break;
default:
break;
}
}
return(returnVar);
}
public (TagInfo?, NFCMessage) ReadInfo(Tag tag)
{
if (tag == null)
{
return(null, NFCMessage.NFC_NULL_TAG);
}
return(new TagInfo
{
Uid = tag.GetId(),
Tag = tag,
IsoDep = IsoDep.Get(tag),
MifareClassic = MifareClassic.Get(tag),
MifareUltralight = MifareUltralight.Get(tag),
NfcV = NfcV.Get(tag),
Ndef = Ndef.Get(tag),
NdefFormatable = NdefFormatable.Get(tag),
NfcA = NfcA.Get(tag),
NfcB = NfcB.Get(tag),
NfcF = NfcF.Get(tag),
NfcBarcode = NfcBarcode.Get(tag),
TechList = tag.GetTechList()
}, NFCMessage.NFC_NO_ERROR);
}
protected override void OnNewIntent(Intent intent)
{
base.OnNewIntent(intent);
Toast.MakeText(this, "Leyendo NFC", ToastLength.Short).Show();
var tag = intent.GetParcelableExtra(NfcAdapter.ExtraTag) as Tag;
/*if (_inWriteMode)
* {
* _inWriteMode = false;
*
* if (tag == null)
* {
* return;
* }
*
* // These next few lines will create a payload (consisting of a string)
* // and a mimetype. NFC record are arrays of bytes.
* var payload = Encoding.ASCII.GetBytes("YeeSaurio");
* var mimeBytes = Encoding.ASCII.GetBytes("application/NFCFighters");
* var apeRecord = new NdefRecord(NdefRecord.TnfMimeMedia, mimeBytes, new byte[0], payload);
* var ndefMessage = new NdefMessage(new[] { apeRecord });
*
* if (!TryAndWriteToTag(tag, ndefMessage))
* {
* // Maybe the write couldn't happen because the tag wasn't formatted?
* TryAndFormatTagWithMessage(tag, ndefMessage);
* }
* }
*
* /*string[] techList = tag.GetTechList();
* info.Text = "";
* foreach (string tech in techList)
* {
* info.Text += "\n\t" + tech;
* }*/
NfcA nfca = NfcA.Get(tag);
NdefFormatable ndeff = NdefFormatable.Get(tag);
IsoDep iso = IsoDep.Get(tag);
MifareUltralight mifU = MifareUltralight.Get(tag);
/*try
* {
* nfca.Connect();
* short s = nfca.Sak;
* byte[] a = nfca.GetAtqa();
* string atqa = Encoding.ASCII.GetString(a);
* info.Text += "\nSAK = " + s + "\nATQA = " + atqa;
* nfca.Close();
* } catch (Exception e)
* {
* Toast.MakeText(this, "NfcA" + e.Message, ToastLength.Short).Show();
* }*/
/*try
* {
* iso.Connect();
*
* iso.Close();
* }
* catch (Exception e)
* {
* Toast.MakeText(this, "IsoDep" + e.Message, ToastLength.Short).Show();
* }*/
/*try
* {
* ndeff.Connect();
* //info.Text += "\nType: " + ndeff.GetType();
* //info.Text += "\nConnected: " + ndeff.IsConnected;
* var rawMsgs = intent.GetParcelableArrayExtra(NfcAdapter.ExtraNdefMessages);
* var msg = (NdefMessage)rawMsgs[0];
* var record = msg.GetRecords()[0];
*
* info.Text += "\n\tNdefFormatted: " + Encoding.ASCII.GetString(record.GetPayload());
* ndeff.Close();
* }
* catch (Exception e)
* {
* Toast.MakeText(this, "NdefFormatted " + e.Message, ToastLength.Short).Show();
* }*/
try
{
mifU.Connect();
byte[] mPag = mifU.ReadPages(12);
StringBuilder aux = new StringBuilder();
String cont_mpag = "";
for (int i = 0; i < mPag.Length; i++)
{
aux.Append(mPag[i]);
}
cont_mpag = aux.ToString();
//info.Text = Charset.AvailableCharsets().ToString();
//var mifM = new String(cont_mpag, Charset.ForName("US-ASCII"));
string mifM = Encoding.ASCII.GetString(mPag);
info.Text += "\nTu personaje es " + mifM;
mifU.Close();
}
catch (Exception e)
{
//Toast.MakeText(this, "MifareUltralight" + e.Message, ToastLength.Short).Show();
}
}
public static string GetManufacturer(Tag tag)
{
string mifareInfo = "";
string[] techtags = tag.GetTechList();
foreach (string s in techtags)
{
if (s.ToLower().IndexOf("mifareultralight") != -1)
{
return("MifareUltralight");
}
else if (s.ToLower().IndexOf("mifareclassic") != -1)
{
mifareInfo = "Mifare Classic";
MifareClassic mifareClassicTag = MifareClassic.Get(tag); //Get MIFARE CLASSIC tag
if (mifareClassicTag != null)
{
if (mifareClassicTag.Type == MifareClassic.TypePlus)
{
mifareInfo = "Mifare Plus";
}
else if (mifareClassicTag.Type == MifareClassic.TypePro)
{
mifareInfo = "Mifare Pro";
}
}
return(mifareInfo);
}
else if (s.ToLower().IndexOf("nfca") != -1)
{
NfcA nfc_A = NfcA.Get(tag);
if (nfc_A != null)
{
byte[] atqa = nfc_A.GetAtqa();
if (atqa.Length >= 2)
{
Int32.TryParse(nfc_A.Sak.ToString(), out int Sak);
switch (atqa[1])
{
case 0x00:
if (atqa[0] == 0x44 || atqa[0] == 0x42 || atqa[0] == 0x02 || atqa[0] == 0x04)
{
if (Sak == 0x20)
{
mifareInfo = "Mifare Plus SL3";
}
else if (Sak == 0x10)
{
mifareInfo = "Mifare Plus SL2";
}
else if (Sak == 0x00)
{
mifareInfo = "Mifare EM";
}
}
break;
case 0x03:
if (atqa[0] == 0x44 || atqa[0] == 0x4)
{
mifareInfo = "Mifare Desfire";
}
break;
default:
break;
}
}
}
}
else if (IsFelicaTag(tag))
{
mifareInfo = "Felica";
}
}
return(mifareInfo);
}
public byte[] NfcA_WritePage(NfcA nfca, byte Page)
{
return(nfca.Transceive(new byte[2] {
NfcA_Write_Key, Page
}));
}
