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Smart Card Solution
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JavaCard API Samples
Java Card Specification
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/* * @file Utility.java * @brief The Class of Util 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.Utility; import javacard.framework.*; public class Utility extends Applet { public static final byte INS_ARRAY_COPY_APDU = 0x01; public static final byte INS_ARRAY_COMPARE_APDU = 0x02; public static final byte INS_SHORT_VALUE_APDU = 0x03; //Redefine the SW1,SW2 error codes short SW_DATA_CONVERT_ERROR = 0x6F80; public static void install(byte[] bArray, short bOffset, byte bLength) { new Utility().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 ins = buf[ISO7816.OFFSET_INS]; switch (ins) { case (byte)INS_ARRAY_COPY_APDU: apdu.setIncomingAndReceive(); //Create a transient byte array with the specified array length byte[] tmpMemory = JCSystem.makeTransientByteArray((short)10, JCSystem.CLEAR_ON_DESELECT); //Fill the byte array 'tmpMemory' (non-atomically) with the value 0x66, beginning from the 0 position, the filling length is 10. Util.arrayFillNonAtomic(tmpMemory, (short)0, (short)10, (byte)0x66); //Copy an array from the 'tmpMemory' array to APDU Buffer. Util.arrayCopy(tmpMemory, (short)0, buf, (short)0, (short)10); //Send the length of 10 bytes from the APDU buffer apdu.setOutgoingAndSend((short)0, (short)10); break; case INS_ARRAY_COMPARE_APDU: //Calling this method indicates that this APDU has incoming data. apdu.setIncomingAndReceive(); //Get the incoming data length(Lc). short lc = apdu.getIncomingLength(); if (lc != 0x04) { ISOException.throwIt(ISO7816.SW_WRONG_LENGTH); } //Define a byte array named 'cmpArray' byte[] cmpArray = {(byte) 0x01, (byte) 0x02, (byte) 0x03, (byte) 0x04}; //Compare an array from the specified source array, byte cmpResult = Util.arrayCompare(cmpArray, (short)0, buf, (short)ISO7816.OFFSET_CDATA, (short)4); //if the comparison of the results is same, set the value of 'buf' byte array to "01", if not, set to "02" if (cmpResult == (byte)0) { buf[0] = (byte)1; } else { buf[0] = (byte)2; } apdu.setOutgoingAndSend((short)0, (short)1); break; case INS_SHORT_VALUE_APDU: apdu.setIncomingAndReceive(); //Get the incoming data length(Lc). short len = apdu.getIncomingLength(); if (len != 0x02) { ISOException.throwIt(ISO7816.SW_WRONG_LENGTH); } //Concatenates the two parameter bytes to form a short value. short short_value1 = Util.makeShort(buf[ISO7816.OFFSET_CDATA], buf[ISO7816.OFFSET_CDATA+1]); //Concatenates two bytes in a byte array to form a short value. short short_value2 = Util.getShort(buf, ISO7816.OFFSET_CDATA); //compare the result value that two methods converted if (short_value1 != short_value2) { ISOException.throwIt(SW_DATA_CONVERT_ERROR); } //Deposits the short value as two successive bytes at the specified offset in the byte array. Util.setShort(buf, (short)0, short_value1); apdu.setOutgoingAndSend((short)0, (short)2); break; default: ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED); } } }