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Harald Welte laforge at gnumonks.orgHi Thomas,
On Thu, Nov 09, 2017 at 08:59:45PM -0500, Thomas Chen wrote:
> my understand of the protocol is that
>
> ME => SIM (first 5 bytes of APDU)
>
> SIM <=== PROCEDURE (either INS as ack, or 0x60 to hold up the protocol)
>
> but that does not help remote sim, as remote SIM would need the susequent bytes
> which will not come until we send back INS, so just holding off ME with 0x60
> does not alleviate the problem of network delay
you don't hold off the ME at that point. Presuming it is "RUN GSM ALGORITHM"
command, then the actual command from ME to card continues here with the random
challenge.
Later, a GET RESPONSE is issued from ME to SIM to obtain the SRES + Kc values,
and this is where we can delay with waiting time extension (0x60) until we
have the result.
--
- Harald Welte <laforge at gnumonks.org> http://laforge.gnumonks.org/
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