The following program is not working,because, ISO7816.SW_PIN_REQUIRED is not finding any library to resolve itself.
How can I replace ISO7816.SW_PIN_REQUIRED with any other constant to make the program to run?
Code: Select all
package testpackage;
import javacard.framework.*;
public class test extends Applet
{
/* constants declaration */
// code of CLA byte in the command APDU header
final static byte Wallet_CLA =(byte)0xB0;
// codes of INS byte in the command APDU header
final static byte Deposit = (byte) 0x10;
final static byte Debit = (byte) 0x20;
final static byte Balance = (byte) 0x30;
final static byte Validate = (byte) 0x40;
// maximum number of incorrect tries before the PIN is blocked
final static byte PinTryLimit =(byte)0x03;
// maximum size PIN
final static byte MaxPinSize =(byte)0x04;
// status word (SW1-SW2) to signal that the balance becomes negative;
final static short SW_NEGATIVE_BALANCE = (short)0x6910;
/* instance variables declaration */
OwnerPIN pin;
byte balance;
byte buffer[]; // APDU buffer
private test()
{
// It is good programming practice to allocate all the memory that an applet needs during its lifetime inside the constructor
pin = new OwnerPIN(PinTryLimit, MaxPinSize);
balance = 0;
register();
} // end of the constructor
public static void install(APDU apdu)
{
// create a Wallet applet instance
new test();
}
public boolean select()
{
// reset validation flag in the PIN object to false
pin.reset();
// returns true to JCRE to indicate that the applet is ready to accept incoming APDUs.
return true;
}
public void process(APDU apdu)
{
// APDU object carries a byte array (buffer) to transfer incoming and outgoing APDU header and data bytes between card and CAD
buffer = apdu.getBuffer();
// verify that if the applet can accept this APDU message
if (buffer[ISO7816.OFFSET_CLA] != Wallet_CLA)
{
ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);
}
switch (buffer[ISO7816.OFFSET_INS])
{
case Balance: getBalance(apdu); return;
case Debit: debit(apdu); return;
case Deposit: deposit(apdu);return;
case Validate: validate(apdu);return;
default:
ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
break;
}
}
private void deposit(APDU apdu) {
// access authentication
if ( ! pin.isValidated() )
ISOException.throwIt (ISO7816.SW_PIN_REQUIRED);
// Lc byte denotes the number of bytes in the data field of the comamnd APDU
byte numBytes = (byte) (buffer[ISO7816.OFFSET_LC]);
// indicate that this APDU has incoming data and receive data starting from the offset ISO.OFFSET_CDATA
byte byteRead =
(byte)(apdu.setIncomingAndReceive());
// it is an error if the number of data bytes read does not match the number in Lc byte
if (byteRead != 1)
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
// increase the balance by the amount specified in the data field of the command APDU.
balance = (byte)
(balance + buffer[ISO7816.OFFSET_CDATA]);
// return successfully
return;
}
private void debit(APDU apdu) {
// access authentication
if ( ! pin.isValidated() )
ISOException.throwIt(ISO7816.SW_PIN_REQUIRED);
byte numBytes = (byte)(buffer[ISO7816.OFFSET_LC]);
byte byteRead =
(byte)(apdu.setIncomingAndReceive());
if (byteRead != 1)
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
// balance can not be negative
if ( ( balance - buffer[ISO7816.OFFSET_CDATA]) < 0 )
ISOException.throwIt(SW_NEGATIVE_BALANCE);
balance = (byte)
(balance - buffer[ISO7816.OFFSET_CDATA]);
} // end of debit method
private void getBalance(APDU apdu) {
// access authentication
if ( ! pin.isValidated() )
ISOException.throwIt(ISO7816.SW_PIN_REQUIRED);
// inform system that the applet has finished processing the command and the system should now prepare to construct a response APDU which contains data field
apdu.setOutgoing();
//indicate the number of bytes in the data field
apdu.setOutgoingLength((byte)1);
// move the data into the APDU buffer starting at offset 0
buffer[0] = balance;
// send 1 byte of data at offset 0 in the APDU buffer
apdu.sendBytes((short)0, (short)1);
}
private void validate(APDU apdu) {
// retrieve the PIN data which requires to be valid ated. The user interface data is stored in the data field of the APDU
byte byteRead =
(byte)(apdu.setIncomingAndReceive());
// validate user interface and set the validation flag in the user object to be true if the validation.
// succeeds. If user interface validation
// fails, PinException would be thrown from
// the pin.check() method.
pin.check(buffer, ISO7816.OFFSET_CDATA, byteRead);
}
} 
