protected void MifareAuthenticate(byte command, byte blockNumber, Uid uid, byte[] key)
{
// Put reader in Idle mode
WriteRegister(Registers.Command, PcdCommands.Idle);
// Clear the FIFO
SetRegisterBits(Registers.FifoLevel, 0x80);
// Create Authentication packet
var data = new byte[12];
data[0] = command;
data[1] = (byte)(blockNumber & 0xFF);
key.CopyTo(data, 2);
uid.Bytes.CopyTo(data, 8);
WriteToFifo(data);
// Put reader in MfAuthent mode
WriteRegister(Registers.Command, PcdCommands.MifareAuthenticate);
// Wait for (a generous) 25 ms
System.Threading.Tasks.Task.Delay(25).Wait();
}
internal byte[] ReadBlock(byte blockNumber, Uid uid, byte[] keyA = null, byte[] keyB = null)
{
if (keyA != null)
MifareAuthenticate(PiccCommands.AuthenticateKeyA, blockNumber, uid, keyA);
else if (keyB != null)
MifareAuthenticate(PiccCommands.AuthenticateKeyB, blockNumber, uid, keyB);
else
return null;
// Read block
Transceive(true, PiccCommands.Read, blockNumber);
return ReadFromFifo(16);
}
internal bool WriteBlock(byte blockNumber, Uid uid, byte[] data, byte[] keyA = null, byte[] keyB = null)
{
if (keyA != null)
MifareAuthenticate(PiccCommands.AuthenticateKeyA, blockNumber, uid, keyA);
else if (keyB != null)
MifareAuthenticate(PiccCommands.AuthenticateKeyB, blockNumber, uid, keyB);
else
return false;
// Write block
Transceive(true, PiccCommands.Write, blockNumber);
if (ReadFromFifo() != PiccResponses.Acknowledge)
return false;
// Make sure we write only 16 bytes
var buffer = new byte[16];
data.CopyTo(buffer, 0);
Transceive(true, buffer);
return ReadFromFifo() == PiccResponses.Acknowledge;
}
public bool SelectTag(Uid uid)
{
// Send Select command to tag
var data = new byte[7];
data[0] = PiccCommands.Select_1;
data[1] = PiccCommands.Select_2;
uid.FullUid.CopyTo(data, 2);
Transceive(true, data);
return GetFifoLevel() == 1 && ReadFromFifo() == PiccResponses.SelectAcknowledge;
}
