SIM card related Projects » osmo-ccid-firmware

rousseau wrote:

The sysmoOCTSIM reader does support only the T=0 protocol as indicated in the USB CCID descriptor:
dwProtocols: 0x0000 0x0001
T=0

This is correct (and documented in the data sheet, AFAICT).

Maybe it can be easy to add support of T=1 protocol?

I haven't really looked into it yet. But it's true, I was typically thinking of APDU mode, where a lot of state machine logic needs to happen inside the reader firmware.

The reader works in TPDU mode so a lot of the T=1 work is done by the CCID driver on the host.

Interesting idea. I suppose pcsc-lite supports that?

I do not have a real use case for T=1 myself. So this issue importance is minor.

Same here. All the commercial users of the sysmoOCTSIM so far have only T=0 use cases, and given that the R&D budget of the sysmoOCTSIM firmware unfortunately exploded due to many problems with the [broken] UART peripheral of the microcontroller, sysmocom decided not to spend even more resources on currently not required features like T=1 support in osmo-ccid-firmware until there either is a strong customer demand, or somebody else contributes related code.

I think that is the first time I have a reader (in which you can insert the card I want) that supports only T=0 cards.

Indeed, it is unusual, I know. But in the telecom domain, all cards must support T=0, so we can actually get away with it. For now.

laforge wrote:

The reader works in TPDU mode so a lot of the T=1 work is done by the CCID driver on the host.

Interesting idea. I suppose pcsc-lite supports that?

pcsc-lite no. pcsc-lite does not contain any reader driver.
But my CCID driver do support TPDU for T=1 (and it is a complex code :-) ).
https://ccid.apdu.fr/#features

I think that is the first time I have a reader (in which you can insert the card I want) that supports only T=0 cards.

Indeed, it is unusual, I know. But in the telecom domain, all cards must support T=0, so we can actually get away with it. For now.

I was not sure that T=0 was mandatory for SIM/USIM cards. It is now clear why only T=0 is supported.