Java card

testApplet.java

package testPackage;


/* 
 * Package: testPackage
 * Filename: TestApplet.java 
 * Class: TestApplet 
 * Date: [[10 June]] of [[2015]] 14:55:52 
 */

import javacard.framework.*;

/* 
 * class TestApplet 
 */
public class TestApplet extends javacard.framework.Applet 
{
	// CLA Byte
	final static byte HELLO_CLA = (byte) 0xB0;
	// Verify PIN
	final static byte INS_HELLO = (byte) 0x20;

	public static void install (byte [] barray, short bOffset, byte bLength) 
	{
		(new TestApplet()).register(barray,(short) (bOffset + 1), barray[bOffset]);
	}

	// Process the command APDU
	public void process(APDU apdu) 
	{
		byte [] buffer = apdu.getBuffer();
		
		if((buffer[ISO7816.OFFSET_CLA] == 0) && (buffer [ISO7816. OFFSET_INS] == (byte) (0xa4)))
		{
			return;
		}
	
		// Validate the CLA byte
		if(buffer[ISO7816.OFFSET_CLA] != HELLO_CLA)
		{
			ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);
		}

		// Select the appropriate instruction byte (INS)
		switch(buffer[ISO7816. OFFSET_INS])
		{
			case INS_HELLO: getHello(apdu); return;
			default: ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
		}
	}

	/*
	 * param APDU 
	 * author Igor Medeiros 
	 * Get user id attribute
	 */
	private void getHello(APDU apdu) 
	{
		// Byte string with the message "Hello World Java Card"
		byte hello[] = {'H','E','L','L','O',' ','W','O','R','L','D'};

		// Tells the JCRE to be sent a reply
		short le = apdu.setOutgoing();

		short totalBytes = (short) hello.length;

		// Tells the JCRE the message size in bytes
		apdu.setOutgoingLength(totalBytes);

		// Send the mensgem to the host
		apdu.sendBytes((short) 0, (short) hello.length);
	}
}