You can copy and use it directly or you can download the JCIDE project from the attachment and build it.
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/**
* @file Communication.java
* @brief Communication Sample Code in JavaCard API Specification
* @comment The purpose of this example is only used to show the usage of API functions and there is no practical significance.
* @copyright Copyright(C) 2016 JavaCardOS Technologies Co., Ltd. All rights reserved.
*/
package JavaCardOS.Sample.Communication;
import javacard.framework.*;
import javacardx.apdu.ExtendedLength;
public class Communication extends Applet implements ExtendedLength
{
public static final byte INS_SEND_RECV_APDU_1 = 0x01;
public static final byte INS_SEND_RECV_APDU_2 = 0x02;
public static final byte INS_RECV_EXTEND_APDU = 0x03;
public static final byte INS_SEND_EXTEND_APDU = 0x04;
private byte[] tmp_memory;
public static final short MAX_LENGTH = (short)(0x7FFF);
public static void install(byte[] bArray, short bOffset, byte bLength)
{
new Communication().register(bArray, (short) (bOffset + 1), bArray[bOffset]);
}
public void process(APDU apdu)
{
if (selectingApplet())
{
return;
}
//Get the apdu buffer datas
byte[] buf = apdu.getBuffer();
byte cla= buf[ISO7816.OFFSET_CLA];
byte ins = buf[ISO7816.OFFSET_INS];
byte p1 = buf[ISO7816.OFFSET_P1];
byte p2 = buf[ISO7816.OFFSET_P2];
short p1p2 = Util.makeShort(p1, p2);
if (cla != (byte)0x80)
{
ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);
}
if (p1p2 != 0x00)
{
ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
}
//Calling this method indicates that this APDU has incoming data.
short recvLen = apdu.setIncomingAndReceive();
//Get the incoming data length(Lc).
short lc = apdu.getIncomingLength();
if (lc == 0x00)
{
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
}
switch (ins)
{
case (byte)INS_SEND_RECV_APDU_1:
//Define a byte string
byte sendStr[] = {'A','P','D','U', ',', 'C','l','a','s','s', ',', 'D','e','m','o'};
short len = (short) sendStr.length;
//Copy character to APDU Buffer.
Util.arrayCopyNonAtomic(sendStr, (short)0, buf, (short)0, (short)len);
//Send the 'sendStr' string, the hex of JCRE sending data is the ASCII of sendStr.
apdu.setOutgoingAndSend((short)0, (short)len);
break;
case (byte)INS_SEND_RECV_APDU_2:
//Set the length of received bytes into the 'buf' array, the offset is 0.
Util.setShort(buf, (short)0, (short)lc);
//Set the data transfer direction to outbound.
short le = apdu.setOutgoing();
//Set the expected(le) length of response data.
apdu.setOutgoingLength((short)le);
//Sends the data of APDU buffer 'buf', the length is 'le' bytes, the offset is 0.
apdu.sendBytes((short) 0, (short)le);
break;
case (byte) INS_RECV_EXTEND_APDU: //
short pointer = 0;
tmp_memory = new byte[MAX_LENGTH];
short offData = apdu.getOffsetCdata();
// recvieve data and put them in a byte array 'tmp_memory'
while (recvLen > (short) 0)
{
Util.arrayCopy(buf, offData, tmp_memory, pointer, recvLen);
pointer += recvLen;
//Gets as many data bytes as will fit without APDU buffer overflow
recvLen = apdu.receiveBytes(offData);
}
// send the lc length
apdu.setOutgoing();
apdu.setOutgoingLength((short)2);
Util.setShort(buf, (short)0, lc);
apdu.sendBytesLong(buf, (short) 0, (short)2);
break;
case (byte) INS_SEND_EXTEND_APDU: //
if(buf[ISO7816.OFFSET_LC] != 0x02)
{
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
}
short sendLen = Util.getShort(buf, ISO7816.OFFSET_CDATA);
// send the specified length data in byte array 'tmp_memory'
apdu.setOutgoing();
apdu.setOutgoingLength(sendLen);
apdu.sendBytesLong(tmp_memory, (short)0, sendLen);
//request Object Deletion
tmp_memory = null;
JCSystem.requestObjectDeletion();
break;
default:
ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
}
}
}
Note:
The purpose of this example is only used to show the usage of API functions and there is no practical significance.
