public async Task <bool> WriteDataAsync(string readerName, ICollection <MifareKey> keys, byte[] bytesToWrite, CancellationToken ct)
{
if (string.IsNullOrEmpty(readerName))
{
throw new Exception("readerName is null");
}
var contextFactory = ContextFactory.Instance;
var cardStatus = await WaitForCardInsert(readerName, contextFactory, ct);
if (!IsValidATR(cardStatus.Atr))
{
throw new Exception("Invalid card type");
}
var context = contextFactory.Establish(SCardScope.System);
using (var isoReader = new IsoReader(context, readerName, SCardShareMode.Shared, SCardProtocol.Any, false))
{
var card = new MifareCard(isoReader);
var loadKeySuccessful = card.LoadKey(
KeyStructure.NonVolatileMemory,
0x00, // first key slot
keys.First().Key // key
);
if (!loadKeySuccessful)
{
throw new Exception("LOAD KEY failed.");
}
if (bytesToWrite.Length > MaxDataSize)
{
throw new Exception($"Data length is more than {MaxDataSize}");
}
var generator = GenerateChunk(bytesToWrite).GetEnumerator();
//write to every block except 0 sector and trailers
for (byte sectorNumber = 1; sectorNumber < MaxSector; sectorNumber++)
{
for (byte blockNumber = 0; blockNumber < BlocksPerSector - 1; blockNumber++)
{
var currentBlock = (byte)(sectorNumber * BlocksPerSector + blockNumber);
if (CheckIfTrailerBlock(currentBlock))
{
throw new Exception("Trying to write to trailer block");
}
byte[] blockToWrite = GetNextBlock(generator);
if (blockToWrite == null)
{
return(true);
}
//auth in every block
var authSuccessful = card.Authenticate(0, currentBlock, KeyType.KeyA, 0x00);
if (!authSuccessful)
{
throw new Exception("AUTHENTICATE failed.");
}
Debug.WriteLine($"Authentification to block {currentBlock} succeded");
Debug.WriteLine($"In block {currentBlock} writing {BitConverter.ToString(blockToWrite)}");
var updateResult = card.UpdateBinary(0, currentBlock, blockToWrite);
if (updateResult == false)
{
//fail to write block
Debug.WriteLine($"Fail to write block {currentBlock}");
return(false);
}
}
}
return(false);
}
}
private void OnCardInserted(object sender, CardStatusEventArgs e)
{
if (!IsValidATR(e.Atr))
{
Debug.WriteLine("Card with invalid ATR inserted");
return;
}
Debug.WriteLine("Card with valid ATR inserted");
var currentContext = ContextFactory.Instance.Establish(SCardScope.System);
using (var isoReader = new IsoReader(currentContext, e.ReaderName, SCardShareMode.Shared, SCardProtocol.Any))
{
var card = new MifareCard(isoReader);
var loadKeySuccessful = card.LoadKey(
KeyStructure.NonVolatileMemory,
0x00, // first key slot
_config.AuthKeys[0].Key // key
);
if (!loadKeySuccessful)
{
//key load failed
Debug.WriteLine("Auth key load failed");
return;
}
Debug.WriteLine("Auth key load success");
var cardDump = new List <byte>();
//read all blocks except 0 sector and trailers
for (byte sectorNumber = 1; sectorNumber < MaxSector; sectorNumber++)
{
for (byte blockNumber = 0; blockNumber < 3; blockNumber++)
{
var currentBlock = (byte)(sectorNumber * BlocksPerSector + blockNumber);
//auth in every block
var authSuccessful = card.Authenticate(0, currentBlock, KeyType.KeyA, 0x00);
if (!authSuccessful)
{
//autentication failed
Debug.WriteLine($"Authentification to block {currentBlock} with key number {0} failed");
return;
}
Debug.WriteLine($"Authentification to block {currentBlock} succeded");
var blockResult = card.ReadBinary(0, currentBlock, BytesPerBlock);
if (blockResult == null)
{
//fail to get block
Debug.WriteLine($"Fail to get block {currentBlock}");
return;
}
cardDump.AddRange(blockResult);
}
}
var result = cardDump.ToArray();
Debug.WriteLine("Reading complete.");
if (result.Length != 0)
{
CardRegistered?.Invoke(this, new CardRegisteredEventArgs(result));
}
}
}