package hwb1;

import javacard.framework.*;
//import javacardx.annotations.*;
import javacard.security.*;
import javacardx.crypto.*;

public class Applet1 extends Applet {
	byte str[] = JCSystem.makeTransientByteArray((short)20, JCSystem.CLEAR_ON_RESET);
	OwnerPIN pin;
	
    public static void install(byte[] bArray, short bOffset, byte bLength) {
        new Applet1(bArray, bOffset, bLength);
    }

    protected Applet1(byte[] bArray, short bOffset, byte bLength) {
    	byte iLen = bArray[bOffset];
    	byte cLen = bArray[(short)(bOffset + iLen + (short)1)];
    	byte aLen = bArray[(short)(bOffset + cLen + (short)1)];
    	
    	pin = new OwnerPIN((byte)3, (byte)4);
        pin.update(bArray, (short)(bOffset + iLen + cLen + 3), aLen);
    	
    	
    	str = new byte[21];
        register();
    }

    private void sendName(APDU apdu) {
    	short len = apdu.setOutgoing();
    	byte name[] = {'o','n','d','r','a'};
    	if (len > name.length) ISOException.throwIt((short)
    			(ISO7816.SW_CORRECT_LENGTH_00 + (short)(name.length)));
    		
    	apdu.setOutgoingLength((short)len);
    	apdu.sendBytesLong(name, (short)0, (short)len);
    }
    
    private void storeData(APDU apdu) {
        if (!pin.isValidated()) {
            ISOException.throwIt(ISO7816.SW_SECURITY_STATUS_NOT_SATISFIED);
        }

    	short bufLen = apdu.setIncomingAndReceive();
    	if (bufLen >= str.length) {
			short err = ISO7816.SW_WRONG_LENGTH;
			err |= (short)(str.length - (short)1);
    		ISOException.throwIt(err);
        }
    	
    	byte [] buf = apdu.getBuffer();
    	Util.arrayCopyNonAtomic(buf, ISO7816.OFFSET_CDATA, str, (short)0, bufLen);
    	str[(short)(str.length - (short)1)] = (byte)bufLen;
    }
    
    private void sendData(APDU apdu) {
        if (!pin.isValidated()) {
            ISOException.throwIt(ISO7816.SW_SECURITY_STATUS_NOT_SATISFIED);
        }

    	short len = apdu.setOutgoing();
    	if (len > (short)str[(short)(str.length - (short)1)]) ISOException.throwIt((short)
    			(ISO7816.SW_CORRECT_LENGTH_00 + (short)(str.length - (short)1)));
    	apdu.setOutgoingLength((short)(str.length - (short)1));
    	apdu.sendBytesLong(str, (short)0, (short)(str.length - (short)1));

	}
    
    public void process(APDU apdu) {
    	byte [] buf = apdu.getBuffer();
        
        if (buf[ISO7816.OFFSET_CLA] != 0x00) {
            ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);
        }

    	byte ins = buf[ISO7816.OFFSET_INS];
    	switch(ins) { 
    	case 0x00: sendName (apdu); return;
    	case 0x02: storeData(apdu); return;
    	case 0x04: sendData (apdu); return;
    	}
    	
    	ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
    	
    }
}