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JavaCard Template project with Gradle

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This is simple JavaCard project template using Gradle build system.

You can develop your JavaCard applets and build cap files with the Gradle! Moreover the project template enables you to test the applet with JCardSim or on the physical cards.

Gradle project contains one module:

Features:

Template

The template contains simple Hello World applet generating random bytes on any APDU message received. There is also implemented very simple test that sends static APDU command to this applet - in JCardSim.

The Gradle project can be opened and run in the IntelliJ Idea.

Running in IntelliJ Idea gives you a nice benefit: Coverage!

How to use

git clone --recursive https://github.com/crocs-muni/javacard-gradle-template-edu.git

Building cap

./gradlew buildJavaCard  --info --rerun-tasks

Generates a new cap file ./applet/out/cap/applet.cap

Note: --rerun-tasks is to force re-run the task even though the cached input/output seems to be up to date.

Typical output:

[ant:cap] [ INFO: ] Converter [v3.0.5]
[ant:cap] [ INFO: ]     Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
[ant:cap]     
[ant:cap]     
[ant:cap] [ INFO: ] conversion completed with 0 errors and 0 warnings.
[ant:verify] XII 10, 2017 10:45:05 ODP.  
[ant:verify] INFO: Verifier [v3.0.5]
[ant:verify] XII 10, 2017 10:45:05 ODP.  
[ant:verify] INFO:     Copyright (c) 1998, 2015, Oracle and/or its affiliates. All rights reserved.
[ant:verify]     
[ant:verify]     
[ant:verify] XII 10, 2017 10:45:05 ODP.  
[ant:verify] INFO: Verifying CAP file /Users/dusanklinec/workspace/jcard/applet/out/cap/applet.cap
[ant:verify] javacard/framework/Applet
[ant:verify] XII 10, 2017 10:45:05 ODP.  
[ant:verify] INFO: Verification completed with 0 warnings and 0 errors.

Installation on a (physical) card

./gradlew installJavaCard

Or inspect already installed applets:

./gradlew listJavaCard

Running on simulator (jCardSim)

As simple as:

./gradlew run

By default the run task will run the main Java application implemented at: main/java/main/Run.java, using the HelloWorldApplet applet.

Running tests

./gradlew test --info --rerun-tasks

Output:

Running test: Test method hello(AppletTest)

Gradle suite > Gradle test > AppletTest.hello STANDARD_OUT
    Connecting to card... Done.
    --> [00C00000080000000000000000] 13
    <-- 51373E8B6FDEC284DB569204CA13D2CAA23BD1D85DCAB02A0E3D50461E73F1BB 9000 (32)
    ResponseAPDU: 34 bytes, SW=9000

Dependencies

This project uses mainly:

Kudos for a great work!

JavaCard support

Thanks to Martin Paljak's ant-javacard and oracle_javacard_sdks we support:

Supported Java versions

Java 8-u271 is the minimal version supported.

Make sure you have up to date java version (-u version) as older java 8 versions have problems with recognizing some certificates as valid.

Only some Java versions are supported by the JavaCard SDKs. Check the following compatibility table for more info: https://github.com/martinpaljak/ant-javacard/wiki/Version-compatibility

Coverage

This is a nice benefit of the IntelliJ Idea - gives you coverage results out of the box.

You can see the test coverage on your applet code.

Coverage summary: coverage summary

Coverage code: coverage code

Troubleshooting

If you experience the following error:

java.lang.VerifyError: Expecting a stackmap frame at branch target 19
    Exception Details:
      Location:
        javacard/framework/APDU.<init>(Z)V @11: ifeq
      Reason:
        Expected stackmap frame at this location.

Then try running JVM with -noverify option.

In the IntelliJ Idea this can be configured in the top tool bar with run configurations combo box -> click -> Edit Configurations -> VM Options.

However, the com.klinec:jcardsim:3.0.5.11 should not need the -noverify.

Invalid APDU loaded

You may experience error like this: Invalid APDU loaded. You may have JC API in your classpath before JCardSim. Classpath:

This error is thrown by JCardSim which tries to load APDU class augmented with another methods. The augmented APDU version is contained in the JCardSim JAR. However, if api_class.jar from the JavaCard SDK is on the classpath before the JCardSim, this problem occurs. The classpath ordering causes non-augmented version is loaded which prevents JCardSim from correct function.

gradle-javacard-plugin v1.7.4 should fix this error.

If you still experience this in IntelliJ Idea try: open project structure settings -> modules -> applet_test and move JCardSim to the top so it appears first on the classpath. This has to be done with each project reload from the Gradle.

Roadmap

TODOs for this project:

Contributions

Community feedback is highly appreciated - pull requests are welcome!