/// <summary>
/// Power On smartcard
/// </summary>
/// <returns>
/// Empty or error message
/// </returns>
public bool AnswerToReset() //ref string response)
{
string retContext = "";
// check for selected reader
if (SelectedReader == "")
{
log.Error("Reader not set");
return(false);
}
// close connection and context
CloseConnection();
System.Threading.Thread.Sleep(20);
ReleaseContext();
// delay before power on
System.Threading.Thread.Sleep(200);
// Try to create new context
retContext = CreateContext();
if (retContext != "")
{
// error detected
return(false);
}
System.Threading.Thread.Sleep(20);
// Connect to smartcard
int ret = WinSCard.SCardConnect(nContext, SelectedReader,
(uint)WinSCard.SCARD_SHARE.SCARD_SHARE_SHARED,
(uint)WinSCard.SCARD_PROTOCOL.SCARD_PROTOCOL_T0 |
(uint)WinSCard.SCARD_PROTOCOL.SCARD_PROTOCOL_T1,
ref nCard, ref nActiveProtocol);
if (ret != 0)
{
// Error detected
log.Error("AnswerToReset " + WinSCard.ParseError(ret));
return(false);
}
// Get ATR
bool retStatus = ReaderStatus();
if (!retStatus)
{
log.Error("AnswerToReset - Error getting ATR");
return(false);
}
return(true);
}
/// <summary>
/// Updates list of readers
/// </summary>
private void UpdateListReaders()
{
byte[] readersBuf = new byte[0];
IntPtr readersBufLen = IntPtr.Zero;
List <byte> lreaders = new List <byte>();
List <string> lstreaders = new List <string>();
//First time to retrieve the len of buffer for readers name
ret = WinSCard.SCardListReaders(nContext, null, readersBuf, out readersBufLen);
// Redim buffer
readersBuf = new byte[readersBufLen.ToInt32()];
// Second time to retrieve readers name
ret = WinSCard.SCardListReaders(nContext, null, readersBuf, out readersBufLen);
if (ret != 0)
{
// Error detected
log.Error("PcscReader::UpdateListReaders: SCardListReaders " + WinSCard.ParseError(ret));
return;
}
if (readersBuf.Length < 5)
{
// No readers founded
return;
}
// Loop to detect readers
for (int j = 0; j < readersBuf.Length; j++)
{
// check for first null byte
if (readersBuf[j] != 0x00)
{
// Add byte to byte list
lreaders.Add(readersBuf[j]);
}
else
{
//check for second null byte (end of list)
if (readersBuf[j - 1] == 0x00)
{
break;
}
// Update readers list
lstreaders.Add(Encoding.ASCII.GetString(lreaders.ToArray()));
lreaders = new List <byte>();
}
}
// update public list
Readers = lstreaders;
}
/// <summary>
/// Release PCSC context
/// </summary>
private void ReleaseContext()
{
if (nContext.ToInt64() != 0)
{
// Release PCSC context
ret = WinSCard.SCardReleaseContext(nContext);
log.Debug("ReleaseContext " + WinSCard.ParseError(ret));
nContext = IntPtr.Zero;
}
}
/// <summary>
/// Disconnect smartcard from reader
/// </summary>
public void CloseConnection()
{
// check for card context
if (nCard.ToInt64() != 0)
{
// disconnect
ret = WinSCard.SCardDisconnect(nCard, (uint)WinSCard.SCARD_DISPOSITION.SCARD_UNPOWER_CARD);
log.Debug("CloseConnection " + ret.ToString());
nCard = IntPtr.Zero;
}
}
private string CreateContext()
{
// Create PCSC context
int ret = WinSCard.SCardEstablishContext(WinSCard.SCARD_SCOPE_SYSTEM, nNotUsed1, nNotUsed2, ref nContext);
if (ret != 0)
{
// Error detected
nContext = IntPtr.Zero;
log.Error("CreateContext " + WinSCard.ParseError(ret));
return(WinSCard.ParseError(ret));
}
log.Debug("CreateContext " + WinSCard.ParseError(ret));
return("");
}
/// <summary>
/// Exchange data with smartcard
/// </summary>
/// <returns>
/// Empty or error message
/// </returns>
public bool SendReceive(string command, ref string response)
{
// check for selected reader
if (SelectedReader == "")
{
log.Error("Card reader not selected");
return(false);
}
IntPtr retCommandLen = new IntPtr(261);
// remove unused digits
command = command.Trim().Replace("0x", "").Replace(" ", "");
// Set input command byte array
byte[] inCommandByte = Utility.GetBytesFromHex(command);
byte[] outCommandByte = new byte[261];
// Prepare structures
WinSCard.SCARD_IO_REQUEST pioSend = new WinSCard.SCARD_IO_REQUEST();
WinSCard.SCARD_IO_REQUEST pioRecv = new WinSCard.SCARD_IO_REQUEST();
pioSend.dwProtocol = (uint)cardProtocol;
pioSend.cbPciLength = (uint)8;
pioRecv.dwProtocol = (uint)cardProtocol;
pioRecv.cbPciLength = 0;
// exchange data with smartcard
int ret = WinSCard.SCardTransmit(nCard,
ref pioSend,
inCommandByte,
inCommandByte.Length,
IntPtr.Zero,
outCommandByte,
out retCommandLen);
if (ret != 0)
{
// Error detected
log.Error("PcScReader.IReader::SendReceive: SCardTransmit " + WinSCard.ParseError(ret));
return(false);
}
// Extract response
response = Utility.GetHexFromBytes(outCommandByte, 0, retCommandLen.ToInt32()).Trim();
return(true);
}
/// <summary>
/// Get ATR and smartcard status
/// </summary>
/// <returns>
/// Empty or error message
/// </returns>
public bool ReaderStatus() //ref string response)
{
// set empty byte array
atrValue = new byte[33];
byte[] retRName = new byte[64];
readerNameLen = new IntPtr(64);
atrLen = new IntPtr(33);
cardProtocol = 1;
uint readerState = 0;
// firts time to set sizes
ret = WinSCard.SCardStatus(nCard, retRName, ref readerNameLen, out readerState,
out cardProtocol, atrValue, ref atrLen);
if (ret != 0)
{
// reset byte array to returned length and retry
atrValue = new byte[atrLen.ToInt32()];
retRName = new byte[readerNameLen.ToInt32()];
ret = WinSCard.SCardStatus(nCard, retRName, ref readerNameLen, out readerState,
out cardProtocol, atrValue, ref atrLen);
}
if (ret != 0)
{
// Error detected
log.Error("ReaderStatus " + WinSCard.ParseError(ret));
return(false);
}
// Extract ATR value
var response = Utility.GetHexFromBytes(atrValue, 0, atrLen.ToInt32());
log.Debug("ATR value: " + response);
return(true);
}
