Hello,
On Fri, May 4, 2012 at 8:05 AM, Nguyễn Hồng Quân <quanngu...@mbm.vn> wrote:
> Hello all,
>
> I tried to send extend APDU in opensc-explorer with this command:
> apdu 00CA0065000800
> and found that the command failed due to insufficient buffer, which had
> been automatically allocated:
It has not been autoamtically allocated, if you look in
opensc-explorer.c you see:
u8 rbuf[SC_MAX_APDU_BUFFER_SIZE];
Which is, indeed, defined as 261
There is also a different define for extended APDU-s:
SC_MAX_EXT_APDU_BUFFER_SIZE (64kB)
> Do we consider this a bug?
It is not a bug in apdu.c, but a deficiency in opensc-explorer. The
simplest would be to extend all buffers in opensc-explorer.c
application to use the extended APDU buffer, but it feels somewhat
wasting (not a real concern on PC-s, where it is supposed to be run
anyway)
As extended APDU-s might not work with all cards or in all readers or
under other certain circumstances, it would be best to have a
flipswitch command in opensc-explorer to turn the extended APDU mode
on or off, and turning it on might fail, if some tests fail (like T=0
is being used, which could be then switched to T=1 mode if the card
did both, or if the reader did not support extended APDU-s etc).
In fact, this test and functionality should be a central part of OpenSC.
Martin
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