I've a NFC reader along with MIFARE Classic 1K card. I've a Visual C# winforms project. Right now I'm able to connect to the reader and detect the card and get it's UUID. The problem I'm facing is while writing and reading data. I searched a lot on internet, found some solution even tested the demo code provided with the SDK... nothing's working.
Let me describe the workflow and code I'm using for writing, authenticating a block, sending APDU and reading the block.
Following is the code for writing data to block 5.
String tmpStr = Text;
int indx;
if (authenticateBlock(Block))
{
ClearBuffers();
SendBuff[0] = 0xFF; // CLA
SendBuff[1] = 0xD6; // INS
SendBuff[2] = 0x00; // P1
SendBuff[3] = (byte)int.Parse(Block); // P2 : Starting Block No.
SendBuff[4] = (byte)int.Parse("16"); // P3 : Data length
SendBuff[5] = 0xFF;
SendBuff[6] = 0xFF;
SendBuff[7] = 0xFF;
SendBuff[8] = 0xFF;
SendBuff[9] = 0xFF;
SendBuff[10] = 0xFF;
for (indx = 0; indx <= (tmpStr).Length - 1; indx++)
{
SendBuff[indx + 5] = (byte)tmpStr[indx];
}
SendLen = SendBuff[4] + 5;
RecvLen = 0x02;
retCode = SendAPDUandDisplay(2);
if (retCode != Card.SCARD_S_SUCCESS)
{
MessageBox.Show("fail write");
}
else
{
MessageBox.Show("write success");
}
}
else
{
MessageBox.Show("FailAuthentication");
}
CloseCardConnection();
The function SendAPDUandDisplay is as below
private int SendAPDUandDisplay(int reqType)
{
int indx;
string tmpStr = "";
pioSendRequest.dwProtocol = Aprotocol;
pioSendRequest.cbPciLength = 8;
//Display Apdu In
for (indx = 0; indx <= SendLen - 1; indx++)
{
tmpStr = tmpStr + " " + string.Format("{0:X2}", SendBuff[indx]);
}
retCode = Card.SCardTransmit(hCard, ref pioSendRequest, ref SendBuff[0],
SendLen, ref pioSendRequest, ref RecvBuff[0], ref RecvLen);
if (retCode != Card.SCARD_S_SUCCESS)
{
return retCode;
}
else
{
try
{
tmpStr = "";
switch (reqType)
{
case 0:
for (indx = (RecvLen - 2); indx <= (RecvLen - 1); indx++)
{
tmpStr = tmpStr + " " + string.Format("{0:X2}", RecvBuff[indx]);
}
if ((tmpStr).Trim() != "90 00")
{
//MessageBox.Show("Return bytes are not acceptable.");
return -202;
}
break;
case 1:
for (indx = (RecvLen - 2); indx <= (RecvLen - 1); indx++)
{
tmpStr = tmpStr + string.Format("{0:X2}", RecvBuff[indx]);
}
if (tmpStr.Trim() != "90 00")
{
tmpStr = tmpStr + " " + string.Format("{0:X2}", RecvBuff[indx]);
}
else
{
tmpStr = "ATR : ";
for (indx = 0; indx <= (RecvLen - 3); indx++)
{
tmpStr = tmpStr + " " + string.Format("{0:X2}", RecvBuff[indx]);
}
}
break;
case 2:
for (indx = 0; indx <= (RecvLen - 1); indx++)
{
tmpStr = tmpStr + " " + string.Format("{0:X2}", RecvBuff[indx]);
}
break;
}
}
catch (IndexOutOfRangeException)
{
return -200;
}
}
return retCode;
}
Function authenticateBlock is as following
private bool authenticateBlock(String block)
{
ClearBuffers();
/*SendBuff[0] = 0xFF; // CLA
SendBuff[2] = 0x00; // P1: same for all source types
SendBuff[1] = 0x82; // INS: for stored key input
SendBuff[3] = 0x00; // P2 : Memory location; P2: for stored key input
SendBuff[4] = 0x05; // P3: for stored key input
SendBuff[5] = 0x01; // Byte 1: version number
SendBuff[6] = 0x00; // Byte 2
SendBuff[7] = (byte)int.Parse(block); // Byte 3: sectore no. for stored key input
SendBuff[8] = 0x60; // Byte 4 : Key A for stored key input
SendBuff[9] = (byte)int.Parse("1"); // Byte 5 : Session key for non-volatile memory
*/
SendBuff[0] = 0xD4;
SendBuff[1] = 0x4A;
SendBuff[2] = 0x01;
SendBuff[3] = 0x00;
SendBuff[4] = (byte) int.Parse(block);
SendBuff[5] = 0xFF;
SendBuff[6] = 0xFF;
SendBuff[7] = 0xFF;
SendBuff[8] = 0xFF;
SendBuff[9] = 0xFF;
SendBuff[10] = 0xFF;
/*SendLen = 0x0A;
RecvLen = 0x02;*/
SendLen = 4;
RecvLen = 255;
retCode = SendAPDUandDisplay(2);
if (retCode != Card.SCARD_S_SUCCESS)
{
//MessageBox.Show("FAIL Authentication!");
return false;
}
return true;
}
One strange thing to notice here is that whatever values I set in sendBuff this function always returns true value and the write data code "The very first code block" returns write success message
But after executing the write data code when I read that very block "5" in my case, there is nothing present there. My read block code returns an empty string and when I try to double check if data was written and my faulty code couldn't read I use an external software to verify that was the value added or not, that software also does not show the data that I wrote and got that write success message.
Ok following is the code I'm using to read block 5.
public string readBlock(String Block)
{
string tmpStr = "";
int indx;
if (authenticateBlock(Block))
{
ClearBuffers();
/*
SendBuff[0] = 0xFF; // CLA
SendBuff[1] = 0xB0;// INS
SendBuff[2] = 0x00;// P1
SendBuff[3] = (byte)int.Parse(Block);// P2 : Block No.
SendBuff[4] = (byte)int.Parse("16");// Le
*/
SendBuff[0] = 0xD4;
SendBuff[1] = 0x40;
SendBuff[2] = 0x01;
SendBuff[3] = 0x30;
SendBuff[4] = byte.Parse(Block.ToString(), System.Globalization.NumberStyles.HexNumber);
SendBuff[5] = 0xFF;
SendBuff[6] = 0xFF;
SendBuff[7] = 0xFF;
SendBuff[8] = 0xFF;
SendBuff[9] = 0xFF;
SendBuff[10] = 0xFF;
//SendLen = 5;
//RecvLen = SendBuff[4] + 2;
SendLen = 5;
RecvLen = 255;
retCode = SendAPDUandDisplay(2);
if (retCode == -200)
{
return "outofrangeexception";
}
if (retCode == -202)
{
return "BytesNotAcceptable";
}
if (retCode != Card.SCARD_S_SUCCESS)
{
return "FailRead";
}
// Display data in text format
for (indx = 0; indx <= RecvLen - 1; indx++)
{
tmpStr = tmpStr + Convert.ToChar(RecvBuff[indx]);
}
return (tmpStr);
}
else
{
return "FailAuthentication";
}
}
Please Note that the read block method is called after checking that is a reader connected connected, if so then I call the readblock method and it returns an empty string
I've tried several values as you would see in comments but nothing seems to help, it's been 3 long days and I'm still stuck here.
Can someone please help me figure where I'm doing it wrong and what values should I send in order to authenticate the block?
Please do me a favour that if anyone gets to knows the problem in my code or want to correctify the values I'm setting in sendBuff[] then please quote them in C# code so I can use exactly the solution you want me to implement
Any sincere help would be highly regarded, thanks in advance.
