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|
/**************************************************************************/
/* */
/* The Why platform for program certification */
/* Copyright (C) 2002-2008 */
/* Romain BARDOU */
/* Jean-Franois COUCHOT */
/* Mehdi DOGGUY */
/* Jean-Christophe FILLITRE */
/* Thierry HUBERT */
/* Claude MARCH */
/* Yannick MOY */
/* Christine PAULIN */
/* Yann RGIS-GIANAS */
/* Nicolas ROUSSET */
/* Xavier URBAIN */
/* */
/* This software is free software; you can redistribute it and/or */
/* modify it under the terms of the GNU General Public */
/* License version 2, as published by the Free Software Foundation. */
/* */
/* This software is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. */
/* */
/* See the GNU General Public License version 2 for more details */
/* (enclosed in the file GPL). */
/* */
/**************************************************************************/
/* $Id: SCID.java,v 1.15 2008/04/22 06:53:45 nrousset Exp $ */
//@+ CheckArithOverflow = no
//@+ InvariantPolicy = Arguments
// @+ AnnotationPolicy = Invariants
// @+ AbstractDomain = Box
// @+ AbstractDomain = Oct
// @+ AbstractDomain = Pol
// Smart Card ID - Example for a Smart Card based Identification and Authentication Application
// File: SCID.java
//
// This applet realizes a identification and authentication application which is typically used
// in online environment. The advantage of this solution is that nearly no adinistrative overhead
// on the smart card side is neccessary because the card is only used for identification of the
// user by PIN verification and authentication of the smart card by a challenge response algorithm.
//
// Smart Card ID is a multi purpose applet. Nearly all applications can be realised with it
// (e.g. physical access for room, logical access computers or information, ....).
// The application functionality is in the background system. Offline Terminals can use precomputed
// triplets for secure authentication of the smart card. For a no security authentication only the
// smart card ID can be used.
//
// In the administrative phase it is possible to write after a successful verification of the
// administrative PIN all data objects into the memory.
// In the operative phase it is possible to read the unique smart card ID, to authenticate the
// smart card with a callenge response algorithm based on DES and to identifiay the user with
// his user PIN. A successful PIN verification can be checked in a secured way.
//
// Memory consumption: EEPROM: 1344 byte, RAM 44 byte
//
// Package AID: 'D2 76 00 00 60 50 05'
// Applet AID: 'D2 76 00 00 60 41 05'
//
// Source code based on java card specification version 2.1.
// Compiled and tested with JDK 1.3.1 Java Card Application Studio (JCAST) V 2.3,
// JLoad 2.0, Java Card Class File Converter 2.1.2, IFDSIM 4.0 and UniverSIM Java Card 64 kB from G&D.
//
//---------------------------------------------------------------------------------------
// Specification of ISO/IEC 7816-4 case 3 command SELECT FILE
// command APDU CLA = '00' || INS = 'A4' ||
// P1 (= '04' = select by DF Name) || P2 (='00') ||
// Lc (= length of DF Name) || DATA (= DF Name)
// response APDU (all case) SW1 || SW2
//
// Specification of ISO/IEC 7816-4 case 3 command VERIFY
// command APDU CLA = '00' || INS = '20' || P1 (= '00') ||
// P2 ('01' = user PIN, '02' = admin PIN)
// Lc (= length of PIN) || DATA (= PIN)
// response APDU (all case) SW1 || SW2
//
// Specification of ISO/IEC 7816-4 case 3 command PUT DATA
// command APDU CLA = '00' || INS = 'DA' ||
// P1 (= '00') || P2 (= TAG ['40' ... 'FE']) ||
// Lc (= length of DATA) ||
// DATA (value field of the DO, with length Lc)
// response APDU (all case) SW1 || SW2
//
// Specification of ISO/IEC 7816-4 case 2 command GET DATA
// command APDU CLA = '00' || INS = 'CA' ||
// P1 (= '00') || P2 (= TAG ['40' ... 'FE'])
// Le (= length of expected data)
// response APDU (good case) DATA (value field of the DO, with length Le) ||
// SW1 || SW2
// response APDU (bad case) SW1 || SW2
//
// Specification of the proprietary case 4 command AUTH SC (authenticate smart card)
// command APDU CLA = '80' || INS = '08' || P1 (= '00') || P2 (= '00')
// Lc (= 8 byte) || C-DATA (with length Lc) || Le (= 21)
// response APDU (good case) R-DATA (with length Le) || SW1 || SW2
// response APDU (bad case) SW1 || SW2
//
// C-DATA: RND [8 byte]
// R-DATA: authentication data || MAC
// authentication data = RND [8 byte] || smart card ID [4 byte] ||
// authentication counter [2 byte] ||
// admin PIN error counter [1 byte] ||
// user PIN error counter [1 byte] || PIN status [1 byte] ||
// padding (with '00', length must be a multiple of 8)
// PIN status = Bit 8 (RFU) || ... Bit 3 (RFU) ||
// Bit 2 (1 = admin PIN succesful verified) ||
// Bit 1 (1 = user PIN succesful verified)
// MAC = last 4 byte of enc (AuthKey) (authentication data)
// authentication counter: no of further possible authentications
// '7FFF' = 32767 max. value,
// '0000' = no further authentication possible
// padding according to ISO/IEC 9797 Method 1 (= 00 00 ...)
//
//---------------------------------------------------------------------------------------
// Implementation Notes
// * no support of different DFs
// * no secure messaging support (= class is alway '00')
// * the authentication counter is used to limit the number of possible attacks to
// the used cryptoalgorithm, it can be set to any value with the PUT DATA command
// * instead of the encryption of the whole response data in the AUTH SC command only
// a 4 byte MAC is used for authentication, because this gives more transperency about
// the exchanged data (data protection laws)
// * the adminstration phase (e.g. the personalisation of the smart card) is done with the
// PUT DATA command. All external seeable data elements of the smart card can be written
// with this ISO/IEC 7816-4 compatible command.
// * The access condition for the administration phase is a VERIFY command with the
// administration PIN.
// * the authentication key could be smart card individual or common for all smart cards
// * if neccessary it is possible to use smart card individual authentication keys. This
// keys should be written into the smart card during the personalisation. As a reference
// to smart card individual keys the smart card ID can be used.
// * abbreviations: RND - random number
// RFU - reserved for future use (content of such a data element is not defined!)
// admin - administration
//
//---------------------------------------------------------------------------------------
// Use Cases
// note: all shown use cases are good cases
// format: --command to smart card-->
// <--response from smart card--
//
// -----Administrative Phase
// Personalisation
// --VERIFY (with default Admin PIN)-->
// <--ok--
// --PUT DATA (Smart Card ID, admin PIN, user PIN, authentication key, authentication counter)-->
// <--ok--
// the following reset is important because of the reset of the validation status of the admin PIN
// --Reset-->
// <--ATR--
//
// change user PIN (e.g. new user PIN, forgotten user PIN, error counter of the user PIN reached maximum value)
// the following command is only neccessary if a card individual admin PIN is used
// --GET DATA (smart card ID)-->
// <--Smart Card ID--
// --VERIFY (with admin PIN)-->
// <--ok--
// --PUT DATA (new user PIN)-->
// <--ok--
// the following reset is important because of the reset of the validation status of the admin PIN
// --Reset-->
// <--ATR--
//
// forgotten admin PIN, error counter of the admin PIN reached maximum value
// new smart card neccessary
//
// -----Operative Phase
// get smart card ID
// --GET DATA (smart card ID)-->
// <--smart card ID--
//
// authenticate smart card without security (advantage: no key is neccessary)
// --GET DATA (Smart Card ID)-->
// <--smart card ID--
//
// authenticate smart card with security
// the following command is only neccessary if a card individual authentication key is used
// --GET DATA (smart card ID)-->
// <--smart card ID--
// --AUTH SC (RND)-->
// <--auth data || MAC--
//
// check user identity
// the following command is only neccessary if a card individual authentication key is used
// --GET DATA (smart card ID)-->
// <--smart card ID--
// --VERIFY (with user PIN)-->
// <--ok--
// --AUTH SC (RND)-->
// <--auth data || MAC--
//
//---------------------------------------------------------------------------------------
// Test Strategy
// good case tests:
// 1.1 test all use cases in good case
// 2.1 write all data objects and verify if they are stored correct
// 3.1 Test all marked "Test!" testpoints
//
// bad case tests:
// 1.1 test correct and wrong admin PIN incl. error counter behaviour
// 1.2 is PUT DATA only possible after successful admin PIN verification?
// 1.3 does AUTH SC give the correct admin PIN validation state back?
// 1.4 does AUTH SC give the correct admin PIN error counter back?
// 2.1 test case 1.1 with user PIN
// 2.2 test case 1.3 with user PIN
// 2.2 test case 1.4 with user PIN
// 4.1 correct authetication behaviour if error counter = 0?
//
//---------------------------------------------------------------------------------------
// This source code is under GNU general public license (see www.opensource.org for details).
// Please send corrections and ideas for extensions to Wolfgang Rankl (www.wrankl.de)
// Copyright 2004 by Wolfgang Rankl, Munich
//---------------------------------------------------------------------------------------
// 29. April 2004 - V 1: initial runnable version
// 10. May 2004 - V 2: improved documentation, 1st published version
//---------------------------------------------------------------------------------------
import javacard.framework.*; // import all neccessary packages for the java card framework
import javacard.security.*; // import all neccessary packages for the java card security
// Bug with lemma ? : gwhy blocked ?
// @ lemma a1: \forall integer b; 0 <= b <= 127 ==> (b & 0x00FF) == b;
// @ axiom a1: \forall integer b; 0 <= b <= 127 ==> (b & 0x00FF) == b;
public class SCID extends Applet {
// definitions for the classes and commands
final static byte PROP_CLASS = (byte) 0x80; // Class of the proprietary APDU commands
final static byte INS_SELECT = (byte) 0xA4; // instruction for the ISO/IEC 7816-4 SELECT FILE command
final static byte INS_VERIFY = (byte) 0x20; // instruction for the ISO/IEC 7816-4 VERIFY command
final static byte INS_PUTDATA = (byte) 0xDA; // instruction for the ISO/IEC 7816-4 PUT DATA command
final static byte INS_GETDATA = (byte) 0xCA; // instruction for the ISO/IEC 7816-4 GET DATA command
final static byte INS_AUTHSC = (byte) 0x08; // instruction for the proprietary AUTH SC command
// definitions for specific returncodes
final static short SW_PIN_FAILED = (short) 0x63C0; // returncode for PIN verification failed
// the last nibble shows the number of remaining tries
final static short SW_DATA_NOT_FOUND = (short) 0x6A88; // referenced data not found
// definitions for the AUTH SC command
final static byte LEN_CAPDU_AUTHSC = (byte) 8; // length of the data in the command APDU of the AUTH SC command
final static byte LEN_RAPDU_AUTHSC = (byte) 21; // length of the data in the response APDU of the AUTH SC command
final static short INDEX_RND = (short) 0; // start position of the RND in the AUTH SC response
final static short INDEX_SCID = (short) 8; // start position of the authentication counter in the AUTH SC response
final static short INDEX_AuthCntr = (short) 12; // start position of the authentication counter in the AUTH SC response
final static short INDEX_APINTries = (short) 14; // position of the admin PIN remaining tries in the AUTH SC response
final static short INDEX_UPINTries = (short) 15; // position of the user PIN remaining tries in the AUTH SC response
final static short INDEX_APINValid = (short) 16; // position of the admin PIN validation status in the AUTH SC response
final static short INDEX_UPINValid = (short) 16; // position of the user PIN validation status in the AUTH SC response
final static short INDEX_MAC = (short) 17; // start position of the MAC in the AUTH SC response
// definitions for some data elements
static short authcntr; // authentication counter, it is a 2 byte signed short value
final static short SIZE_AUTHCNTR = (short) 2; // size of the authentication counter in byte
static byte[] scid; // the smart card ID
final static short SIZE_SCID = (short) 4; // size of the unique smart card identifier in byte
//@ static invariant scid_inv: scid != null && scid.length == SIZE_SCID;
static byte[] workarray; // workarray
final static short SIZE_WORKARRAY = (short) 30; // size of the workarray
//@ static invariant workarray_inv: workarray != null && workarray.length == SIZE_WORKARRAY;
static DESKey authkey; // authentication key
//@ static invariant authkey_inv: authkey != null;
final static short SIZE_AUTHKEY = (short) 8; // authentication key is a 8 byte long DES key
static Signature mac; // MAC (message authentication code)
//@ static invariant mac_inv: mac != null;
// definitions for the storage of the data elements
final static short TAG_USERPIN = (short) 0x51; // tag for the user PIN
final static short TAG_ADMINPIN = (short) 0x52; // tag for the administrative PIN
final static short TAG_AUTHKEY = (short) 0x53; // tag for the authentication key
final static short TAG_AUTHCNTR = (short) 0x54; // tag for the athentication counter
final static short TAG_SCID = (short) 0x55; // tag for the smart card ID
// constants and variables for the admin PIN management
final static byte[] DEFAULT_ADMINPIN // default admin PIN value
= {(byte) 0x22, (byte) 0x22, (byte) 0x22};
final static byte ADMINPIN_SIZE = (byte) 3; // size of the PIN in byte
final static byte DEFAULT_ADMINPIN_MAXEC = (byte) 2; // default value of the PIN error counter
final static byte ADMINPIN_ID = (byte) 2; // PIN identifier, PIN 2 = admin PIN
static OwnerPIN adminpin; // the PIN object
//@ static invariant adminpin_inv: adminpin != null;
// constants and variables for the user PIN management
final static byte[] DEFAULT_USERPIN // default user PIN value
= {(byte) 0x00, (byte) 0x00};
final static byte USERPIN_SIZE = (byte) 2; // size of the PIN in byte
final static byte DEFAULT_USERPIN_MAXEC = (byte) 3; // default value of the PIN error counter
final static byte USERPIN_ID = (byte) 1; // PIN identifier, PIN 1 = user PIN
static OwnerPIN userpin; // the PIN object
//@ static invariant userpin_inv: userpin != null;
// constants and variables for the key management
final static byte[] DEFAULT_AUTHKEY // default authentication key
= {(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
(byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00};
//---------------------------------------------------------------------------------------
//----- installation and registration of the applet
public static void install(byte[] buffer, short offset, byte length) {
// create the object for the smart card ID
scid = new byte[SIZE_SCID];
// create a multiple useable object in RAM with an array of bytes
workarray = JCSystem.makeTransientByteArray(SIZE_WORKARRAY, JCSystem.CLEAR_ON_DESELECT); // Test!
// create the object for admin PIN and set it to the default value
adminpin = new OwnerPIN(DEFAULT_ADMINPIN_MAXEC, ADMINPIN_SIZE);
adminpin.update(DEFAULT_ADMINPIN, (short)(0), ADMINPIN_SIZE);
// create the object for user PIN and set it to the default value
userpin = new OwnerPIN(DEFAULT_USERPIN_MAXEC, USERPIN_SIZE);
userpin.update(DEFAULT_USERPIN, (short)(0), USERPIN_SIZE);
// create the key object for authentication and set the key to the default value
authkey = (DESKey)KeyBuilder.buildKey(KeyBuilder.TYPE_DES, KeyBuilder.LENGTH_DES, false);
authkey.setKey(DEFAULT_AUTHKEY, (short)0);
// create a signature object for MAC calculating
// padding in line with ISO/IEC 9797 Method 1 (= 000 ...)
mac = Signature.getInstance(Signature.ALG_DES_MAC4_ISO9797_M1, false);
// register the application within the JCRE
new SCID().register();
} // install
//---------------------------------------------------------------------------------------
//----- this is the command dispatcher
//@ requires apdu != null;
public void process(APDU apdu) {
byte[] cmd_apdu = apdu.getBuffer();
// delete global used variables, for better robustness
Util.arrayFillNonAtomic(workarray, (short) 0, SIZE_WORKARRAY, (byte) 0);
if (cmd_apdu[ISO7816.OFFSET_CLA] == ISO7816.CLA_ISO7816) {
//----- it is the ISO/IEC 7816 class
switch(cmd_apdu[ISO7816.OFFSET_INS]) {
case INS_SELECT:
// it is a SELECT FILE instruction
cmdSELECT(apdu);
break;
case INS_VERIFY:
// it is a VERIFY instruction
cmdVERIFY(apdu);
break;
case INS_PUTDATA:
// it is a PUT DATA instruction
cmdPUTDATA(apdu);
break;
case INS_GETDATA:
// it is a GET DATA instruction
cmdGETDATA(apdu);
break;
default :
// the instruction in the command apdu is not supported
ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
} // switch
} // if
else if (cmd_apdu[ISO7816.OFFSET_CLA] == PROP_CLASS) {
//----- it is the proprietary class
switch(cmd_apdu[ISO7816.OFFSET_INS]) {
case INS_AUTHSC:
// it is a AUTH SC instruction
cmdAUTHSC(apdu);
break;
default :
// the instruction in the command apdu is not supported
ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
} // switch
} // else if
else {
// the class in the command apdu is not supported
ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);
} // else
} // process
//---------------------------------------------------------------------------------------
//----- program code for the APDU command SELECT FILE
private void cmdSELECT(APDU apdu) {
byte[] cmd_apdu = apdu.getBuffer();
//----- check preconditions in the APDU header
// check if P1='04'
if (cmd_apdu[ISO7816.OFFSET_P1] != 0x04) {
ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
} // if
// check if P2='00'
if (cmd_apdu[ISO7816.OFFSET_P2] != 0x00) {
ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
} // if
short lc = (short)(cmd_apdu[ISO7816.OFFSET_LC] & 0x00FF); // get Lc (command length)
receiveAPDUBody(apdu); // get the command body
//----- command functionality
if (JCSystem.getAID().equals(cmd_apdu, ISO7816.OFFSET_CDATA, (byte) lc) == false) {
ISOException.throwIt(ISO7816.SW_APPLET_SELECT_FAILED);
} // if
//----- prepare response APDU
ISOException.throwIt(ISO7816.SW_NO_ERROR); // command proper executed
} // cmdSELECT
//---------------------------------------------------------------------------------------
//----- program code for the APDU command VERIFY
private void cmdVERIFY(APDU apdu) {
byte[] cmd_apdu = apdu.getBuffer();
//----- check preconditions in the APDU header
// check if P1='00'
if (cmd_apdu[ISO7816.OFFSET_P1] != 0) {
ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
} // if
short lc = (short)(cmd_apdu[ISO7816.OFFSET_LC] & 0x00FF); // get Lc (command length)
receiveAPDUBody(apdu); // get the command body
if (cmd_apdu[ISO7816.OFFSET_P2] == USERPIN_ID) { // it is the user PIN
if (lc != USERPIN_SIZE) { // Lc = length of PIN ?
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
} //if
if (userpin.check(cmd_apdu, ISO7816.OFFSET_CDATA, USERPIN_SIZE) == false) {
// PIN verification not successful
short tries = userpin.getTriesRemaining();
ISOException.throwIt( (short) (SW_PIN_FAILED + tries)); // send error counter in APDU back
} // if
} // if
else if (cmd_apdu[ISO7816.OFFSET_P2] == ADMINPIN_ID) { // it is the administrative PIN
if (lc != ADMINPIN_SIZE) { // Lc = length of PIN ?
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
} //if
if (adminpin.check(cmd_apdu, ISO7816.OFFSET_CDATA, ADMINPIN_SIZE) == false) {
// PIN verification not successful
short tries = adminpin.getTriesRemaining();
ISOException.throwIt( (short) (SW_PIN_FAILED + tries)); // send error counter in APDU back
} // if
} // if
else { // it is not a valid PIN identifier
ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
} // else
// PIN verification successful
ISOException.throwIt(ISO7816.SW_NO_ERROR); // command proper executed
} // cmdVERIFY
//---------------------------------------------------------------------------------------
//----- program code for the APDU command PUT DATA
private void cmdPUTDATA(APDU apdu) {
byte[] cmd_apdu = apdu.getBuffer();
//----- check preconditions in the APDU header
// check if P1=0
if (cmd_apdu[ISO7816.OFFSET_P1] != 0) {
ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
} // if
// check if P2 contents an allowed tag value
short tag = (short) (cmd_apdu[ISO7816.OFFSET_P2] & (short) 0x00FF);
if ((tag < (short) 0x0040) || (tag > (short) 0x00FE)) {
ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
} // if
short lc = (short)(cmd_apdu[ISO7816.OFFSET_LC] & (short) 0x00FF); // calculate Lc (command length)
receiveAPDUBody(apdu); // get the command body
//----- check precoditions of security status
if (adminpin.isValidated() == false) {
ISOException.throwIt(ISO7816.SW_SECURITY_STATUS_NOT_SATISFIED);
} // if
//----- command functionality
switch(tag) {
case TAG_USERPIN:
// the user PIN must be changed
if (lc != USERPIN_SIZE) ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
Util.arrayCopy(cmd_apdu, (short)((ISO7816.OFFSET_CDATA) & 0x00FF), workarray, (short) 0, lc);
userpin.update(workarray, (short) 0, USERPIN_SIZE);
break;
case TAG_ADMINPIN:
// the admin PIN must be changed
if (lc != ADMINPIN_SIZE) ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
Util.arrayCopy(cmd_apdu, (short)((ISO7816.OFFSET_CDATA) & 0x00FF), workarray, (short) 0, lc);
adminpin.update(workarray, (short) 0, ADMINPIN_SIZE);
break;
case TAG_AUTHKEY:
// the authentication key must be changed
if (lc != SIZE_AUTHKEY) ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
Util.arrayCopy(cmd_apdu, (short)((ISO7816.OFFSET_CDATA) & 0x00FF), workarray, (short) 0, lc);
authkey.setKey(workarray, (short)0);
break;
case TAG_AUTHCNTR:
// the authentication counter must be changed
if (lc != SIZE_AUTHCNTR) ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
Util.arrayCopy(cmd_apdu, (short)((ISO7816.OFFSET_CDATA) & 0x00FF), workarray, (short) 0, lc);
if (Util.getShort(workarray, (short)0) > 0x7FFF) ISOException.throwIt(ISO7816.SW_WRONG_DATA);
authcntr = Util.getShort(workarray, (short)0);
break;
case TAG_SCID:
// the smart card ID must be changed
if (lc != SIZE_SCID) ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
Util.arrayCopy(cmd_apdu, (short)((ISO7816.OFFSET_CDATA) & 0x00FF), scid, (short) 0, lc);
break;
default :
// the tag in the command apdu is not supported
ISOException.throwIt(SW_DATA_NOT_FOUND);
} // switch
//----- prepare response APDU
ISOException.throwIt(ISO7816.SW_NO_ERROR); // command proper executed
} // cmdPUTDATA
//---------------------------------------------------------------------------------------
//----- program code for the APDU command GET DATA
private void cmdGETDATA(APDU apdu) {
byte[] cmd_apdu = apdu.getBuffer();
//----- check preconditions in the APDU header
// check if P1=0
if (cmd_apdu[ISO7816.OFFSET_P1] != 0) {
ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
} // if
// check if P2 contents an allowed tag value
short tag = (short) (cmd_apdu[ISO7816.OFFSET_P2] & (short) 0x00FF);
if ((tag < 0x40) || (tag > 0xFE)) {
ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
} // if
short le = (short)(cmd_apdu[ISO7816.OFFSET_LC] & 0x00FF); // calculate Le (expected length)
//----- command functionality
switch(tag) { // a switch construct is used because of the easy extensibility for additional tags
case TAG_SCID:
// get the smart card ID
if (le != SIZE_SCID) ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
Util.arrayCopy(scid, (short) (0), workarray, (short) 0, le);
break;
default :
// the tag in the command apdu could not found
ISOException.throwIt(SW_DATA_NOT_FOUND);
} // switch
//----- now all preparations are done, the data object can be send to the IFD -----
apdu.setOutgoing(); // set transmission to outgoing data
apdu.setOutgoingLength((short)le); // set the number of bytes to send to the IFD
apdu.sendBytesLong(workarray, (short) 0, (short)le); // send the requested the number of bytes to the IFD, data field of the DO
} // cmdGETDATA
//---------------------------------------------------------------------------------------
//----- program code for the APDU command AUTH SC
private void cmdAUTHSC(APDU apdu) {
byte[] cmd_apdu = apdu.getBuffer();
//----- check preconditions in the APDU header
// check if P1=0
if (cmd_apdu[ISO7816.OFFSET_P1] != 0)
ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
// check if P2=0
if (cmd_apdu[ISO7816.OFFSET_P2] != 0)
ISOException.throwIt(ISO7816.SW_WRONG_P1P2);
short lc = (short)(cmd_apdu[ISO7816.OFFSET_LC] & 0x00FF); // get Lc (command length)
if (lc != LEN_CAPDU_AUTHSC)
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
receiveAPDUBody(apdu); // get the command body
//----- check security preconditions
if (authcntr < 0)
ISOException.throwIt(SW_PIN_FAILED); // Test!
//----- collect all data for the signature
Util.arrayCopy(cmd_apdu, (short) ISO7816.OFFSET_CDATA, workarray, INDEX_RND, lc); // RND from IFD
Util.arrayCopy(scid, (short) (0), workarray, INDEX_SCID, SIZE_SCID); // smart card ID
Util.setShort(workarray, INDEX_AuthCntr, authcntr); // authentication counter
workarray[INDEX_APINTries] = adminpin.getTriesRemaining();
workarray[INDEX_UPINTries] = userpin.getTriesRemaining();
if (adminpin.isValidated() == true) {
workarray[INDEX_APINValid] = (byte) (workarray[INDEX_APINValid] | (byte) 0x01); // Test!
} // if
if (userpin.isValidated() == true) {
workarray[INDEX_UPINValid] = (byte) (workarray[INDEX_UPINValid] | (byte) 0x02); // Test!
} // if
mac.init(authkey, Signature.MODE_SIGN);
short len = mac.sign(workarray, (short) 0, LEN_RAPDU_AUTHSC, workarray, INDEX_MAC); // calculate the MAC
authcntr = (short) (authcntr - (short) 1); // update number of allowed authentication
//----- now all calculations are done, the data can be send to the IFD
apdu.setOutgoing(); // set transmission to outgoing data
apdu.setOutgoingLength(LEN_RAPDU_AUTHSC); // set the number of bytes to send to the IFD
apdu.sendBytesLong(workarray, (short) 0, LEN_RAPDU_AUTHSC); // send the requested the number of bytes to the IFD, data field of the DO
} // cmdAUTHSC
//---------------------------------------------------------------------------------------
//----- receive the body of the command APDU
public void receiveAPDUBody(APDU apdu) {
byte[] buffer = apdu.getBuffer();
short lc = (short)(buffer[ISO7816.OFFSET_LC] & 0x00FF); // calculate Lc (command length)
// check if Lc != number of received bytes of the command APDU body
if (lc != apdu.setIncomingAndReceive()) {
ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
} // if
} // receiveAPDUBody
} // class
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