Mobile Application Languages XML, Java, J2ME and JavaCard Lesson 07 JavaCard

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1 Mobile Application Languages XML, Java, J2ME and JavaCard Lesson 07 JavaCard Oxford University Press All rights reserved. 1

2 Java Card Has CPU with limited processing command and low clock frequency operations An IC card 4 kb ROM A microprocessor card with 18 kb flash read only memory Oxford University Press All rights reserved. 2

3 JavaCard (Java for card) A micro-edition of Java for the cards A limited-memory sized edition for cards, labels, tokens, and similar devices which have limited memory as well as processing capacity Oxford University Press All rights reserved. 3

4 JavaCard Provides interoperability for cards and APIs for highly memory-efficient applications Has multiple communication interfaces for inter card-host contact/contactless (wireless) communication APIs Oxford University Press All rights reserved. 4

5 JavaCard ISO7816-based Extended length APDU support 20 maximum number of logical communication channels Provides standard communication with the host using latest SIM cards Oxford University Press All rights reserved. 5

6 javacard.security and javacard.crypto Supports digital-signature-based message recovery and advanced cryptography class libraries for HMAC- MD5, HMAC-SHA1, and SHA-256 Oxford University Press All rights reserved. 6

7 Java Card framework (javacard.framework) Provides the library functions, Card interfaces, PIN (personal identification number), and ISO 7816 APIs for Card applet JCardSystem a class in JavaCard, has a method maketransientarray ( ) The method creates a transient array and it persists till power is down Oxford University Press All rights reserved. 7

8 JavaCard Profile A set of limited class libraries SmartCard Profile has a separate virtual machine called card VM Oxford University Press All rights reserved. 8

9 The card VM Different for different card OSes Oxford University Press All rights reserved. 9

10 JavaCard Executive Provides communication I/O streams between the JavaCard APIs and supports interoperability among the cards from different hardware and different card OSes Oxford University Press All rights reserved. 10

11 Card virtual machine (CardVM) Has an instruction set for a subset of Java language Installs applets and libraries into Java Card-based devices CardVM does not support weak reference as already mentioned for KVM Oxford University Press All rights reserved. 11

12 CardVM A virtual machine which has no char No double precision, or single precision No floating point mathematical operations support supports only Boolean, 8 bit Byte, BCD, 6 bit integer (short) (32 bit integer support optional) Limited exceptional handling Oxford University Press All rights reserved. 12

13 CardVM No object clones No String class libraries No automatic garbage collection (memory freeing) No native support using JNI (Java native interface) to use C/C++ application interface with the Java APIs Oxford University Press All rights reserved. 13

14 CardVM No SecurityManager class libraries No multi-threading No ThreadGroup Oxford University Press All rights reserved. 14

15 Card applets For application execution Java class libraries of the application Oxford University Press All rights reserved. 15

16 Card applets Java Card is a technology which supports a secure environment for smart cards and small-devices applets Multiple applets can be deployed on a single card and new ones can be added any time at the user end Oxford University Press All rights reserved. 16

17 card Applet Creates card-specific byte code on compilation Java applet has lifecycle starting from initiate, followed by start, stop, and destroy Oxford University Press All rights reserved. 17

18 Applet for communication Uses select method for selecting the process APDU whether it is a command APDU or response APDU Card applet differs from Java applet as it can reside permanently on card Objects created by card applet are persistent When applet is deselected the transient array disposes Oxford University Press All rights reserved. 18

19 Applet for communication Command APDU identifies a class for instruction, finds specific instruction from the class, uses two bytes for two parameters of the instruction, and specifies the length of optional data with the APDU Response APDU has data (optional) and two byes for status words Oxford University Press All rights reserved. 19

20 JCRE (Java Card runtime environment) Interprets the card byte codes and implements them using Java Card virtual machine Does not support inter-communication between different card applets Provides runtime support to the services like selection and de-selection of applets Oxford University Press All rights reserved. 20

21 Summary JavaCard A limited-memory sized edition for cards, labels, tokens, and similar devices which have limited memory as well as processing capacity javacard.crypto and javacard.security Card Profile Card VM Card Applet Oxford University Press All rights reserved. 21

22 End of Lesson 07 JavaCard Oxford University Press All rights reserved. 22

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