Building JavaCard applet CAP files with Ant

Easy to use Ant task for building JavaCard CAP files in a declarative way.

Features

• Do What I Mean. You will love it!
• No dependencies, no extra or unrelated downloads. Just a 14KB jar.
• Supports all available JavaCard SDK versions: 2.1.2, 2.2.1, 2.2.2, 3.0.3, 3.0.4 and 3.0.5
  • Get one from oracle.com or use the handy Github repository
• Works on all platforms with Java 1.8: Windows, OSX, Linux.
• Almost everything integrates or works with Ant.
• Can be easily integrated into continuous integration workflows.
• Generates CAP files from sources or pre-compiled class files.
• Import external libraries: natural use of .exp files and .jar libraries.
• No restrictions on project folder layout.
• Loading JavaCard applets is equally pleasing with GlobalPlatformPro

Maven repository

This is Ph4r05 build:

<dependency>
  <groupId>com.klinec</groupId>
  <artifactId>ant-javacard</artifactId>
  <version>1.8.0</version>
</dependency>

Gradle:

compile group: 'com.klinec', name: 'ant-javacard', version: '1.8.0'

Download & Use

• Download ant-javacard.jar (be sure to get the latest version)
  • The only supported Java version for all SDK targets is 1.8!
• Or use the download task:

<get src="https://github.com/martinpaljak/ant-javacard/releases/download/18.01.17/ant-javacard.jar" dest="." skipexisting="true"/>

• Then add the following to your build.xml file:

<taskdef name="javacard" classname="pro.javacard.ant.JavaCard" classpath="ant-javacard.jar"/>

• Now you can create applets within your Ant targets like this:

<javacard>
  <cap jckit="/path/to/jckit_dir" aid="0102030405" output="MyApplet.cap" sources="src/myapplet">
    <applet class="myapplet.MyApplet" aid="0102030405060708"/>
  </cap>
</javacard>

(which results in output similar to this)

target:
      [cap] INFO: using JavaCard v2.2.2 SDK in ../jc222_kit
      [cap] Setting package name to testapplets
      [cap] Building CAP with 1 applet from package testapplets
      [cap] testapplets.Empty 0102030405060708
  [compile] Compiling 1 source file to /var/folders/l7/h99c5w6j0y1b8_qbsth_9v4r0000gn/T/antjc4506897175807383834
      [cap] CAP saved to /Users/martin/projects/ant-javacard/Empty222.cap

Syntax

Sample:

<javacard jckit="/path/to/jckit_dir1">
  <cap jckit="/path/to/jckit_dir2" aid="0102030405" package="package.name" version="0.1" output="MyApplet.cap" sources="src/myapplet" classes="path/to/classes" export="mylib">
    <applet class="myapplet.MyApplet" aid="0102030405060708"/>
    <import exps="path/to/exps" jar="/path/to/lib.jar"/>
  </cap>
</javacard>

Details:

• javacard tag - generic task
  • jckit attribute - path to the JavaCard SDK that is used if individual cap does not specify one. Optional if cap defines one, required otherwise.
• cap tag - construct a CAP file
  • jckit attribute - path to the JavaCard SDK to be used for this CAP. Optional if javacard defines one, required otherwise.
  • sources attribute - path to Java source code, to be compiled against the current JavaCard SDK. Either sources or classes is required.
  • classes attribute - path to pre-compiled class files to be assembled into a CAP file. If both classes and sources are specified, compiled class files will be put to classes folder, which is created if missing.
  • package attribute - name of the package of the CAP file. Optional - set to the parent package of the applet class if left unspecified.
  • version attribute - version of the package. Optional - defaults to 0.0 if left unspecified.
  • aid attribute - AID (hex) of the package. Recommended - or set to the 5 first bytes of the applet AID if left unspecified.
  • output attribute - path where to save the generated CAP file. Required.
  • export attribtue - path (folder) where to place the JAR and generated EXP file. Optional.
  • jar attribute - path where to save the generated archive JAR file. Optional.
  • jca attribute - path where to save the generated JavaCard Assembly (JCA) file. Optional.
  • verify attribute - if set to false, disables verification of the resulting CAP file with offcardeverifier. Optional.
  • debug attribute - if set to true, generates debug CAP components. Optional.
  • ints attribute - if set to true, enables support for 32 bit int type. Optional.
• applet tag - for creating an applet inside the CAP
  • class attribute - class of the Applet where install() method is defined. Required.
  • aid attribute - AID (hex) of the applet. Recommended - or set to package aid+i where i is index of the applet definition in the build.xml instruction
• import tag - for linking against external components/libraries, like GPSystem or OPSystem
  • exps attribute - path to the folder keeping .exp files. Required
  • jar attribute - path to the JAR file for compilation. Optional - only required if using sources mode and not necessary with classes mode if java code is already compiled

Notes:

• jc.home property has the highest precedence, followed by jckit path of cap, followed by path in javacard, followed by JC_HOME environment variable. SDK must be valid to be considered for use.

License

• MIT

Happy users

A random list of users, with a public link:

• Applets:
  • IsoApplet by @philipWendland
  • NdefApplet by @promovicz
  • GidsApplet by @vletoux
  • LedgerWalletApplet by @LedgerHQ
  • KeePassNFC by @nfd
  • PivApplet (PIV) by @arekinath
  • OpenFIP201 (PIV) by @makinako
  • Cryptonit (PIV) by @mbrossard
  • HTOP NDEF by @petrs
  • Yubikey OTP by @arekinath
  • Plus loads of academic projects, classes and papers.
• Integration projects:
  • JavaCard Gradle plugin by @bertrandmartel
  • JavaCard Template project with Gradle by @ph4r05
• Other:
  • You! Don't torture yourself with complexity, KISS!

Contact

• See javacard.pro

Similar projects

• standard JavaCard SDK Ant tasks
  • :( as cumbersome to use as the command line utilities
  • :( not declarative/DWIM enough
  • :) very explicit interface with all details exposed
• JavaCard Gradle plugin (MIT) - https://github.com/bertrandmartel/javacard-gradle-plugin
  • :) Wraps ant-javacard for use with Gradle
• gradle-javacard (Apache 2.0) - https://github.com/fidesmo/gradle-javacard
  • :) nice declarative interface
  • :( requires gradle (40M download)
  • :( JavaCard 2.2.2 only
• EclipseJCDE (Eclipse 1.0) - http://eclipse-jcde.sourceforge.net/
  • :( JavaCard 2.2.2 only
  • :( not possible to integrate in CI - depends on eclipse
  • :( essentially an Eclipse GUI wrapper for JC SDK
• JCOP Tools
  • :( not open source
• NetBeans IDE JC support
  • :( not possible to integrate into CI
  • :( JavaCard 3.0 only
  • :( Netbeans, not cross platform
• Maven2 task from FedICT (LGPL3) - https://code.google.com/p/eid-quick-key-toolset
  • :( Maven downloads half the internet before even simple tasks
  • :( JavaCard 2.2.2 only
• Ant script files with templates
  • :( XML is a very bad and verbose programming environment