Hi Peter I am trying to extend openpgp-tool to load data to the various writable DOs, > and - if possible - I want it to determine automatically the permissions of > the (emulated) files using standard interfaces, i.e. security attributes or > preferably ACLs. As the file system on openPGP cards only is emulated using > opensc, I need to emulate these data structures too. > > I searched the net, but did not get anything that that really helped (I > guess, > I did not know/ use the correct search terms ;-) > > I found that ISO 7816-9 should contain info on security attributes, but I > am > not really keen on paying ~€60 for this information alone. >
Have a look at "Security Attributes" in ISO 7816-4 and table "Access mode byte for EFs". You may either use compact or expanded form to describe your access rules. When those DOs are selected I would return a FCP with tag A0 which should contan two access mode bytes (one for reading and one for writing) each followed by security condition bytes. Peter
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