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i was wondering if anybody knows an existing ISO7816 compliant file system implementation for javacard? I do know that there is no API for this and you have to do it yourself but i was wondering that despite numerous questions about that topic i havent found a single implementation for this problem on the internet. Has anyone done this on a decent level of quality or is everybody just hacking the minimum of what is needed?

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    From what I've seen its the latter. There was a file system API proposal for Java Card once, but it was sunk. I'm however happy to be proven wrong (and don't call my implementation "minimum" ;) ) Commented Nov 13, 2014 at 21:29
  • Do you want sample code using filesystem in Javacard? Commented Nov 16, 2014 at 11:36
  • I search for java card code that implements a ISO7816- compliant file system, not exactly sure though, how your question is meant Commented Nov 16, 2014 at 18:21

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You can refer JavaPurseCrypto applet which is a javacard applet to implement electronic card using file system. It's a sample code located in Javacard kit.

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How does this qualify as not "just hacking the minimum of what is needed"?
@Micheal I thought Paul needs an implementation of filesystem in Javacard. Am I wrong? If so I'll delete my answer
well, just exactly what Michael wrote already. Basically it supports a subset of the A4-Select command.

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