CODEWITHSUNDEEP
javaappletsmartcardjavacardapdu
Amit Singh
Amit Singh

Reputation: 13

Java Card JCA file to CAP file name

Converting hello.jca file to hello.cap file using

./capgen.bat ".\hello.jca" -o ".\hello.cap"

output file is always a.jar even though I'm specifying the output file name.

Upvotes: 1

Views: 367

Answers (1)

Sergei Danielian
Sergei Danielian

Reputation: 5025

There is one way you can do that by using the -config params.json attribute of the capgen.bat tool.

However, you have to download and use capgen.bat file of at least 3.1.0 version, as even 3.0.5 doesn't have the mentioned attribute (see below). This can be achieved by download the 3.1.0 version of JavaCard Development Kit Tools namely the java_card_tools-win-bin-b_17-06_jul_2021.zip file.

Proof (3.0.5 version)

PS C:\Users\pc> capgen.bat -version
CapGen [v3.0.5]
    Copyright (c) 1998, 2018, Oracle and/or its affiliates. All rights reserved.

PS C:\Users\pc> capgen.bat -help

usage: capgen [-options] filename
where options include:

-help           Print this message and exit.
-nobanner       Do not display informational messages.
-o <filename>   Output filename. default: a.jar
-version        Print version number and exit.

Proof (3.1.0 version)

PS C:\Users\pc> C:\development\code\java_card_tools-win-bin-b_17-06_jul_2021\bin\capgen.bat -version
CapGen [v3.1.0]
    Copyright (c) 1998, 2021, Oracle and/or its affiliates. All rights reserved.

PS C:\Users\pc> C:\development\code\java_card_tools-win-bin-b_17-06_jul_2021\bin\capgen.bat -help

usage: capgen [-options] filename
where options include:
-help           Print this message and exit.
-nobanner       Do not display informational messages.
-o <filename>   Output filename. default: a.jar
-version        Print version number and exit.
-config         Run capgen in extended mode. In this case the filename must have .json extension.

Now, here is how I set the json file:

{
    "inputConfig": {
        "CAP_AID": "01:02:03:04:05:10",
        "CAP_name": "helloworld",
        "CAP_version": "1.0",
        "outputDir": "output",
        "debug": true,
        "inputPackages": [{
            "jcainputfile": "helloworld.jca"
        }]
    }
}

And here is how I invoked the command:

C:\development\code\java_card_tools-win-bin-b_17-06_jul_2021\bin\capgen.bat -config .\jca-to-cap.json

The helloworld.cap file appears in the .\output\helloworld\javacard directory. You can play with outputDir option in the json file to change the destination folder.

Note: the cap file one gets this way weighs less than if use the "normal" way by using the convert_applet.bat file.

Upvotes: 0

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