private void WriteDataToTag(Tag tag)
{
try
{
ndefHandler.SetKeys(AppSettings.Global.PubKey, AppSettings.Global.PrivKey);
ndefHandler.SetExtraSignDataFromTag(tag);
byte[] rawNdefMsg = ndefHandler.GenerateRawNdefMessage(writeData);
NdefMessage ndefMsg = new NdefMessage(rawNdefMsg);
bool?written = WriteNdef(tag, ndefMsg);
if (written == false)
{
written = FormatNdef(tag, ndefMsg);
}
if (written == true)
{
ShowToast("Written " + ndefMsg.ByteArrayLength + " bytes of NDEF data.");
Finish();
}
}
finally
{
ndefHandler.ClearKeys();
ndefHandler.ClearExtraSignData();
}
}
private byte[] ProcessUpdate(byte[] apdu)
{
int address = ((apdu[2] & 0xFF) << 8) | (apdu[3] & 0xFF);
if (address < 0 || address >= 1024)
{
return(WRONG_PARAMETERS);
}
if (address != 0)
{
return(WRONG_PARAMETERS);
}
int length = apdu[4] & 0xFF;
if (apdu.Length < length + 5)
{
return(STATUS_FAILED);
}
if (dataToPublish == null || confirmed)
{
return(FILE_NOT_FOUND);
}
byte[] challenge = new byte[length];
Buffer.BlockCopy(apdu, 5, challenge, 0, length);
try
{
ndefHandler.SetKeys(AppSettings.Global.PubKey, AppSettings.Global.PrivKey);
ndefHandler.SetExtraSignData(challenge);
ndefHandler.KeepEmptyFields = true;
ndefData = ndefHandler.GenerateRawNdefMessage(dataToPublish);
return(STATUS_SUCCESS);
}
catch (Exception e)
{
ShowToast("Failed preparing HCE data: " + e.Message);
return(STATUS_FAILED);
}
finally
{
ndefHandler.ClearKeys();
ndefHandler.ClearExtraSignData();
}
}