//this method will open a reader instance and read the nfc device with
//cmd as its input and the command to run. it will return a string of the result.
//@params cmd - the command to run
private string readNFC(CmdApdu cmd)
{
PCSCReader reader = new PCSCReader();
string payload = "";
try
{
reader.Connect();
reader.ActivateCard(GS.SCard.Const.SCARD_SHARE_MODE.Exclusive, GS.SCard.Const.SCARD_PROTOCOL.Tx);
RespApdu respApdu = reader.Exchange(cmd, 0x9000);
if (respApdu.SW1SW2 == 0x9000)
{
payload = Encoding.UTF8.GetString(respApdu.Data);
}
}
catch (Exception ex)
{
Console.WriteLine(ex.Message);
}
finally
{
reader.Disconnect();
}
return(payload);
}
/// <summary>
/// The function Exchange sends a command APDU to a smart card and returns the response ADPU from the card.
/// </summary>
/// <param name="cmdApdu">The command ADPU.</param>
/// <param name="expectedSW1SW2">The expected status word SW1SW2.</param>
/// <returns>The response APDU.</returns>
public RespApdu Exchange(CmdApdu cmdApdu, ushort?expectedSW1SW2)
{
byte[] responseBuffer = this.Exchange(cmdApdu.GetBytes(), expectedSW1SW2);
RespApdu respApdu = new RespApdu(responseBuffer);
return(respApdu);
}
/// <summary>
/// The function Exchange sends a command APDU to a smart card and returns the response ADPU from the card.
/// </summary>
/// <param name="sendBuffer">The command ADPU.</param>
/// <param name="sendLength">Length of the command ADPU.</param>
/// <param name="responseBuffer">The response APDU.</param>
/// <param name="responseLength">Length of the response APDU.</param>
/// <param name="expectedSW1SW2">The expected status word SW1SW2.</param>
public void Exchange(byte[] sendBuffer, int sendLength, out byte[] responseBuffer, out int responseLength, ushort?expectedSW1SW2)
{
responseBuffer = null;
CmdApdu cmdApud;
if (sendBuffer.Length == sendLength)
{
cmdApud = new CmdApdu(sendBuffer);
}
else
{
byte[] baSendTemp = new byte[sendLength];
Array.Copy(sendBuffer, baSendTemp, sendLength);
cmdApud = new CmdApdu(baSendTemp);
}
int respBufferSize = 2;
if ((cmdApud.Le != null))
{
respBufferSize = (int)cmdApud.Le + 2;
}
byte[] baTempResp = new byte[respBufferSize];
responseLength = baTempResp.Length;
this.Exchange(sendBuffer, sendLength, baTempResp, ref responseLength, expectedSW1SW2);
responseBuffer = new byte[responseLength];
Array.Copy(baTempResp, responseBuffer, responseLength);
}
//This method is what is in change of authenticating a user
//@params receives session details like username and password
//@return is a boolean value: true if conditions are satisfied, false otherwise
public BooleanResult AuthenticateUser(SessionProperties properties)
{
//object that will passed to windows authentication
UserInformation userInfo = properties.GetTrackedSingle <UserInformation>();
//Aid selection for getting token from unlocked phone
byte[] tokenAID = { 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0 };
CmdApdu selectApplication = new CmdApdu();
selectApplication.CLA = 0x00;
selectApplication.INS = 0xA4;
selectApplication.P1 = 0x04;
selectApplication.P2 = 0x00;
selectApplication.Data = tokenAID;
selectApplication.Le = 0x00;
string userTokenInput = readNFC(selectApplication);
//get device id
string devId = readDevId();
//check if the devid is registered to any account
if (validDevId(devId))
{
//get token info and verify
string userToken = getUserToken(devId);
Boolean validToken = verifyToken(userTokenInput, userToken);
//get username via device id
userInfo.Username = EncryptDecrypt.Decrypt(getUserName(devId));
//check if the token is associated to an account
if (validToken)
{
//check if pincode matches db pincode with the same devid
if (validPin(userInfo.Password, userToken))
{
//get account details to send to winlogon
userInfo.Password = getUserPin(userToken);
// Successful authentication
DBLogger(userInfo.Username, "Sucessful Login");
return(new BooleanResult()
{
Success = true
});
}
}
// Authentication failure
DBLogger(userInfo.Username, "Unsucessful Login attempt");
}
return(new BooleanResult()
{
Success = false, Message = "Incorrect credentials."
});
}
private void BtnPhoneKey_Click(object sender, EventArgs e)
{
//Aid selection for getting token from unlocked phone
byte[] tokenAID = { 0xF0, 0xF0, 0xF0, 0xF0, 0xF0, 0xF0 };
CmdApdu selectApplication = new CmdApdu();
selectApplication.CLA = 0x00;
selectApplication.INS = 0xA4;
selectApplication.P1 = 0x04;
selectApplication.P2 = 0x00;
selectApplication.Data = tokenAID;
selectApplication.Le = 0x00;
txtBoxPhoneKey.Text = readNFC(selectApplication);
}
private void Button1_Click(object sender, EventArgs e)
{
CmdApdu uid = new CmdApdu();
uid.CLA = 0xFF;
uid.INS = 0xCA;
uid.P1 = 0x01;
uid.P2 = 0x00;
uid.Le = 0x04;
string devId = readNFC(uid);
txtBoxDevId.Text = devId;
}
//this method will get the devid from the nfc device
private string readDevId()
{
CmdApdu uid = new CmdApdu();
uid.CLA = 0xFF;
uid.INS = 0xCA;
uid.P1 = 0x01;
uid.P2 = 0x00;
uid.Le = 0x04;
string devId = readNFC(uid);
return(devId);
}
//note 2 self ushort? and Nullable<ushort> are the same
public RespApdu Exchange(CmdApdu cmdApdu, Nullable<ushort> expectedSW1SW2)
{
byte[] responseBuffer = this.Exchange(cmdApdu.GetBytes(), expectedSW1SW2);
RespApdu respApdu = new RespApdu(responseBuffer);
return respApdu;
}
/// <summary>
/// The function Exchange sends a command APDU to a smart card and returns the response ADPU from the card.
/// </summary>
/// <param name="cmdApdu">The command ADPU.</param>
/// <returns>The response APDU.</returns>
public RespApdu Exchange(CmdApdu cmdApdu)
{
return this.Exchange(cmdApdu, null);
}
/// <summary>
/// The function Exchange sends a command APDU to a smart card and returns the response ADPU from the card.
/// </summary>
/// <param name="sendBuffer">The command ADPU.</param>
/// <param name="sendLength">Length of the command ADPU.</param>
/// <param name="responseBuffer">The response APDU.</param>
/// <param name="responseLength">Length of the response APDU.</param>
/// <param name="expectedSW1SW2">The expected status word SW1SW2.</param>
public void Exchange( byte[] sendBuffer, int sendLength, out byte[] responseBuffer, out int responseLength, ushort? expectedSW1SW2 )
{
responseBuffer = null;
CmdApdu cmdApud;
if (sendBuffer.Length == sendLength)
{
cmdApud = new CmdApdu( sendBuffer );
}
else
{
byte[] baSendTemp = new byte[sendLength];
Array.Copy(sendBuffer, baSendTemp, sendLength);
cmdApud = new CmdApdu(baSendTemp);
}
int respBufferSize = 2;
if((cmdApud.Le != null) )
{
respBufferSize = (int)cmdApud.Le + 2;
}
byte[] baTempResp = new byte[respBufferSize];
responseLength = baTempResp.Length;
this.Exchange(sendBuffer, sendLength, baTempResp, ref responseLength, expectedSW1SW2);
responseBuffer = new byte[responseLength];
Array.Copy(baTempResp, responseBuffer, responseLength);
}
/// <summary>
/// The function Exchange sends a command APDU to a smart card and returns the response ADPU from the card.
/// </summary>
/// <param name="cmdApdu">The command ADPU.</param>
/// <returns>The response APDU.</returns>
public RespApdu Exchange(CmdApdu cmdApdu)
{
return(this.Exchange(cmdApdu, null));
}
