Mifare

Mifare card - RFID Card

This class supports Mifare cards. They are RFID cards responding to ISO 14443 type A. You need a specific card reader like PN532, PN5180 to read, write those kind of cards.

Usage

You'll need first to get the card from an RFID reader. The example below shows how to do it with a PN532 and read all the sectors and print all the sector data information.

byte[] retData = null;
while (!Console.KeyAvailable)
{
    retData = pn532.ListPassiveTarget(MaxTarget.One, TargetBaudRate.B106kbpsTypeA);
    if (retData is object)
        break;
    // Give time to PN532 to process
    Thread.Sleep(200);
}
if (retData is null)
    return;
var decrypted = pn532.Decode106kbpsTypeA(retData.AsSpan().Slice(1));
if (decrypted is object)
{
    Console.WriteLine($"Tg: {decrypted.TargetNumber}, ATQA: {decrypted.Atqa} SAK: {decrypted.Sak}, NFCID: {BitConverter.ToString(decrypted.NfcId)}");
    if (decrypted.Ats is object)
        Console.WriteLine($", ATS: {BitConverter.ToString(decrypted.Ats)}");
    MifareCard mifareCard = new MifareCard(pn532, decrypted.TargetNumber) { BlockNumber = 0, Command = MifareCardCommand.AuthenticationA };
    mifareCard.SetCapacity(decrypted.Atqa, decrypted.Sak);
    mifareCard.SerialNumber = decrypted.NfcId;
    mifareCard.KeyA = new byte[6] { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
    mifareCard.KeyB = new byte[6] { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
    for (byte block = 0; block < 64; block++)
    {
        mifareCard.BlockNumber = block;
        mifareCard.Command = MifareCardCommand.AuthenticationB;
        var ret = mifareCard.RunMifiCardCommand();
        if (ret < 0)
        {
            // Try another one
            mifareCard.Command = MifareCardCommand.AuthenticationA;
            ret = mifareCard.RunMifiCardCommand();
        }

        if (ret >= 0)
        {
            mifareCard.BlockNumber = block;
            mifareCard.Command = MifareCardCommand.Read16Bytes;
            ret = mifareCard.RunMifiCardCommand();
            if (ret >= 0)
                Console.WriteLine($"Bloc: {block}, Data: {BitConverter.ToString(mifareCard.Data)}");
            else
            {
                Console.WriteLine($"Error reading bloc: {block}, Data: {BitConverter.ToString(mifareCard.Data)}");
            }
            if (block % 4 == 3)
            {
                // Check what are the permissions
                for (byte j = 3; j > 0; j--)
                {
                    var access = mifareCard.BlockAccess((byte)(block - j), mifareCard.Data);
                    Console.WriteLine($"Bloc: {block - j}, Access: {access}");
                }
                var sector = mifareCard.SectorTailerAccess(block, mifareCard.Data);
                Console.WriteLine($"Bloc: {block}, Access: {sector}");
            }
        }
        else
        {
            Console.WriteLine($"Authentication error");
        }
    }
}