Java Card Platform - Oracle

[Pages:134]Java CardTM Platform

Runtime Environment Specification, Classic Edition

Version 3.1

February 2021

Java Card Platform Runtime Environment Specification, Classic Edition Version 3.1

Copyright ? 1998, 2021, Oracle and/or its affiliates. All rights reserved.

The Specification provided herein is provided to you only under the Oracle Technology Network Developer License included herein as Annex A - Oracle Technology Network Developer License Terms.

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Java Card Platform Runtime Environment Specification, v3.1

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Java Card Platform Runtime Environment Specification, v3.1

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Java Card Platform Runtime Environment Specification, v3.1

Contents

Preface .......................................................................................................................................... 14 Who Should Use This Specification......................................................................................................... 14 Before You Read This Specification......................................................................................................... 14 Shell Prompts .......................................................................................................................................... 14 Typographic Conventions ....................................................................................................................... 15 Related Documentation .......................................................................................................................... 15 Third-Party Web Sites ............................................................................................................................. 15 Documentation Accessibility................................................................................................................... 16 Access to Oracle Support ........................................................................................................................ 16 Oracle Welcomes Your Comments ......................................................................................................... 16

1 Introduction .............................................................................................................................. 17 2 Lifetime of the Java Card Virtual Machine ................................................................................ 19

2.1 Initialization....................................................................................................................................... 19 3 Java Card Applet Lifetime.......................................................................................................... 21

3.1 install Method............................................................................................................................ 21 3.2 select Method .............................................................................................................................. 22 3.3 process Method............................................................................................................................ 22 3.4 deselect Method(s) ..................................................................................................................... 23 3.5 uninstall Method ....................................................................................................................... 23 3.6 Power Loss and Reset ....................................................................................................................... 23

3.6.1 Concurrent Operations Over Multiple Interfaces ...................................................................... 24 4 Logical Channels and Applet Selection ..................................................................................... 27

4.1 Logical Channels Overview ............................................................................................................... 27 4.2 Default Applets ................................................................................................................................. 30

4.2.1 Card Reset Behavior................................................................................................................... 30 4.2.2 Proximity Card (PICC) Activation Behavior ................................................................................ 31 4.2.3 Default Applet Selection Behavior on Opening a New Channel ................................................ 31 4.3 Multiselectable Applets .................................................................................................................... 32

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4.4 Forwarding APDU Commands To a Logical Channel......................................................................... 34 4.5 Opening and Closing Logical Channels.............................................................................................. 36

4.5.1 MANAGE CHANNEL Command Processing ................................................................................ 36 4.6 Applet Selection ................................................................................................................................ 37

4.6.1 Applet Selection with MANAGE CHANNEL OPEN ...................................................................... 37 4.6.2 Applet Selection with SELECT FILE ............................................................................................. 39 4.7 Applet Deselection ............................................................................................................................ 41 4.7.1 MANAGE CHANNEL CLOSE Command ........................................................................................... 42 4.8 Other Command Processing ............................................................................................................. 42 5 Memory Model ......................................................................................................................... 45 5.1 Transient Objects .............................................................................................................................. 46 5.1.1 Transient Objects Characteristics .............................................................................................. 46 5.1.2 Events That Clear Transient Objects .......................................................................................... 46 5.2 Temporary Objects............................................................................................................................ 47 5.3 Array views........................................................................................................................................ 48 5.3.1 Characteristics of an Array View ................................................................................................ 48 5.3.2 Creating and Using an Array View ............................................................................................. 49 6 Applet Isolation and Object Sharing ......................................................................................... 51 6.1 Applet Firewall .................................................................................................................................. 51 6.1.1 Firewall Protection ..................................................................................................................... 51 6.1.2 Contexts and Context Switching ................................................................................................ 51

6.1.2.1 Active Contexts in the VM .................................................................................................. 52 6.1.2.2 Context Switching in the VM............................................................................................... 53 6.1.3 Object Ownership ...................................................................................................................... 53 6.1.4 Object Access ............................................................................................................................. 54 6.1.5 Transient Objects and Contexts ................................................................................................. 55 6.1.6 Static Fields and Methods.......................................................................................................... 56 6.1.6.1 Optional Static Access Checks............................................................................................. 56 6.2 Object Access Across Contexts ......................................................................................................... 56 6.2.1 Java Card RE Entry Point Objects ............................................................................................... 56 6.2.2 Sharing Arrays ............................................................................................................................ 57

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6.2.2.1 Sharing using Global Arrays ................................................................................................ 58 6.2.2.2 Sharing using Array Views................................................................................................... 58 6.2.3 Java Card RE Privileges ............................................................................................................... 58 6.2.4 Shareable Interfaces .................................................................................................................. 59 6.2.4.1 Server Applet A Builds a Shareable Interface Object.......................................................... 59 6.2.4.2 Client Applet B Obtains the Shareable Interface Object..................................................... 60 6.2.4.3 Client Applet B Requests Services from Applet A ............................................................... 60 6.2.5 Determining the Previous Context............................................................................................. 61 6.2.5.1 Java Card RE Context........................................................................................................... 61 6.2.6 Shareable Interface Details ........................................................................................................ 61 6.2.6.1 Java Card API Shareable Interface ...................................................................................... 61 6.2.7 Obtaining Shareable Interface Objects ...................................................................................... 62 6.2.7.1 Applet.getShareableInterfaceObject(AID, byte) Method ................... 62 6.2.7.2 JCSystem.getAppletShareableInterfaceObject Method .......................... 62 6.2.8 Class and Object Access Behavior .............................................................................................. 63 6.2.8.1 Accessing Static Class Fields................................................................................................ 63 6.2.8.2 Accessing Array Objects ...................................................................................................... 64 6.2.8.3 Accessing Class Instance Object Fields ............................................................................... 64 6.2.8.4 Accessing Class Instance Object Methods .......................................................................... 64 6.2.8.5 Accessing Standard Interface Methods .............................................................................. 65 6.2.8.6 Accessing Shareable Interface Methods ............................................................................. 65 6.2.8.7 Throwing Exception Objects ............................................................................................... 65 6.2.8.8 Accessing Classes ................................................................................................................ 65 6.2.8.9 Accessing Standard Interfaces ............................................................................................ 66 6.2.8.10 Accessing Shareable Interfaces......................................................................................... 66 6.2.8.11 Accessing Array Object Methods ...................................................................................... 66 7 Transactions and Atomicity....................................................................................................... 67 7.1 Atomicity ........................................................................................................................................... 67 7.2 Transactions ...................................................................................................................................... 67 7.3 Transaction Duration ........................................................................................................................ 68 7.4 Nested Transactions.......................................................................................................................... 68

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7.5 Tear or Reset Transaction Failure ..................................................................................................... 68 7.6 Aborting a Transaction...................................................................................................................... 68

7.6.1 Programmatic Abortion ............................................................................................................. 69 7.6.2 Abortion by the Java Card RE..................................................................................................... 69 7.6.3 Cleanup Responsibilities of the Java Card RE............................................................................. 69 7.7 Transient Objects and Global Arrays................................................................................................. 69 7.8 Commit Capacity ............................................................................................................................... 69 7.9 Context Switching ............................................................................................................................. 70 8 Remote Method Invocation ...................................................................................................... 71 8.1 Java Card Platform RMI..................................................................................................................... 71 8.1.1 Remote Objects.......................................................................................................................... 71

8.1.1.1 Parameters and Return Values ........................................................................................... 71 8.1.1.2 Exceptions ........................................................................................................................... 72 8.1.1.3 Functional Limitations......................................................................................................... 72 8.2 RMI Messages ................................................................................................................................... 72 8.2.1 Applet Selection ......................................................................................................................... 73 8.2.2 Method Invocation..................................................................................................................... 73 8.3 Data Formats..................................................................................................................................... 73 8.3.1 Remote Object Identifier ........................................................................................................... 74 8.3.2 Remote Object Reference Descriptor ........................................................................................ 74 8.3.3 Method Identifier....................................................................................................................... 76 8.3.4 Parameter Encoding................................................................................................................... 76 8.3.4.1 Primitive Data Type Parameter Encoding ........................................................................... 77 8.3.4.2 Array Parameter Encoding .................................................................................................. 77 8.3.5 Return Value Encoding............................................................................................................... 78 8.3.5.1 Normal Response Encoding ................................................................................................ 78 8.3.5.2 Exception Response Encoding ............................................................................................ 79 8.3.5.3 Error Response Encoding .................................................................................................... 80 8.4 APDU Command Formats ................................................................................................................. 80 8.4.1 SELECT FILE Command ............................................................................................................... 80 8.4.2 INVOKE Command ..................................................................................................................... 82

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