private void WriteNdefToMifareStandard(PcscSdk.MifareStandard.AccessHandler mifare, byte[] ndefData)
{
InitializeMifareStandard(mifare);
const int capacity = 15 * 3 * 16;
byte[] wrappedData = GenerateTLVData(ndefData);
if (wrappedData.Length > capacity)
{
throw new NfcHandlerException("Data size of " + wrappedData.Length + " bytes exceeds capacity of " + capacity + " bytes!");
}
int data_length = wrappedData.Length;
Array.Resize(ref wrappedData, (data_length / 16) * 16 + 16);
byte writeBlock = 3;
for (byte pos = 0; pos < wrappedData.Length; pos += 16)
{
if (++writeBlock % 4 == 3)
{
writeBlock++;
}
mifare.Write(writeBlock, wrappedData.Skip(pos).Take(16).ToArray(), GeneralAuthenticate.GeneralAuthenticateKeyType.MifareKeyA, 1);
}
StatusMessage?.Invoke("Written " + data_length + " bytes of data. Ndef message length is " + ndefData.Length + " bytes.");
}
private void InitializeMifareStandard(PcscSdk.MifareStandard.AccessHandler mifare)
{
byte[] mad1 = mifare.Read(1, PcscSdk.MifareStandard.GeneralAuthenticate.GeneralAuthenticateKeyType.MifareKeyA, 0);
byte[] mad2 = mifare.Read(2, PcscSdk.MifareStandard.GeneralAuthenticate.GeneralAuthenticateKeyType.MifareKeyA, 0);
// One of my readers only has two key slots, another one does not allow overwriting them, but has at least 3. So here we go...
// Also, the Microsoft IFD emulation(?) reports 0x0000 in response, but it still seems to have worked.
byte factoryKeySlot = 0;
try
{
mifare.LoadKey(PcscSdk.MifareStandard.DefaultKeys.FactoryDefault, 0);
StatusMessage?.Invoke("Loaded factory default key in slot 0.");
}
catch (ApduFailedException e)
{
if (e.Response.SW == 0x0000 && e.Response.ResponseData.Length == 0 && mifare.CardReader.Name.Contains("Microsoft IFD"))
{
StatusMessage?.Invoke("Loaded factory default key in slot 0. (MS Quirk)");
}
else
{
StatusMessage?.Invoke("Could not re-load to slot 0, trying slot 2: " + e.Message);
mifare.LoadKey(PcscSdk.MifareStandard.DefaultKeys.FactoryDefault, 2);
StatusMessage?.Invoke("Loaded factory default key in slot 2.");
factoryKeySlot = 2;
}
}
if (!mad1.SequenceEqual(ndefMadData[1]) || !mad2.SequenceEqual(ndefMadData[2]))
{
StatusMessage?.Invoke("Writing NDEF MAD block.");
for (byte block = 1; block < 4; block++)
{
StatusMessage?.Invoke("Writing MAD block " + block);
try
{
mifare.Write(block, ndefMadData[block], GeneralAuthenticate.GeneralAuthenticateKeyType.MifareKeyA, factoryKeySlot);
}
catch (Exception)
{
mifare.Write(block, ndefMadData[block], GeneralAuthenticate.GeneralAuthenticateKeyType.PicoTagPassKeyB, factoryKeySlot);
}
}
}
for (int sector = 1; sector < 16; sector++)
{
byte block = (byte)(sector * 4 + 3);
try
{
for (int i = 1; i < 4; i++)
{
var authRes = mifare.CardReader.Transceive(new PcscSdk.MifareStandard.GeneralAuthenticate((byte)(block - i), 1, GeneralAuthenticate.GeneralAuthenticateKeyType.MifareKeyA));
if (!authRes.Succeeded)
{
StatusMessage?.Invoke("NDEF read authentication failed, trying trailer rewrite.");
throw new Exception();
}
}
byte[] sectorIdent = mifare.Read(block, GeneralAuthenticate.GeneralAuthenticateKeyType.MifareKeyA, 1);
if (!sectorIdent.SequenceEqual(ndefComparator))
{
throw new Exception();
}
}
catch (Exception)
{
StatusMessage?.Invoke("Writing NDEF trailer into sector " + sector);
try
{
mifare.Write(block, ndefSectorIdent, GeneralAuthenticate.GeneralAuthenticateKeyType.MifareKeyA, factoryKeySlot);
}
catch (Exception)
{
mifare.Write(block, ndefSectorIdent, GeneralAuthenticate.GeneralAuthenticateKeyType.PicoTagPassKeyB, factoryKeySlot);
}
}
}
StatusMessage?.Invoke("Tag is NDEF formated");
}