On Tuesday 30 May 2006 02:18, Peter Tomlinson wrote:
> Some card readers and their drivers handle
> the 'double TPDU per Class 4 APDU' sequencing, others leave it to the
> application - this makes offering a universal application impossible.
Not impossible, just a little annoying. If your app has to support both, you
just need to watch for the 6CXX responses and issue the necessary GET DATA
command. For T=1 cards and T=0 cards with readers that handle clase 4 APDUs
for you, you'll never see the 6CXX (probably).
Note that this difference can sometimes wreak havoc with secure messaging
protocols in certain cases. Outside of that, though, I haven't found it to
be a difficult problem to manage.
Shawn.
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