CODEWITHSUNDEEP
javacardsim-card
MFA
MFA

Reputation: 547

using java card instead of SIM in android with SEEK

I've patched android with SEEK for Galaxy S3 and after some struggle I'm now able to send APDUs to SIM card and get proper responses.

I want to place my own applet inside SIM but since there is no way we can get the access to do so, I start to wonder if there is anyway we can issue a java card to work like a SIM card. All I need is a java card that the phone can't distinguish from a SIM, no network coverage is needed and I know it is almost impossible to create a SIM that works OK with operator and gives network coverage.

The reason for all this is I need to send APDUs and work with my applet, but if I insert a java card instead of a SIM card in GS3, it gives me no access at all.

So my question is this: Is it possible to issue a java card so that it looks like a SIM by the phone (and not the operator)?

or Is it possible to change android so that it gives needed access when there is a java card in it, i.e. RIL works as usual?

EDIT

Okay, I think I'll try to issue a Java Card with following properties:

First, it will have an auto selected applet (default applet) that from now on will be call fake-UICC.
Second, in fake-UICC we'll emulate the file system of UICC (according to http://www.in2eps.com/fo-uicc/tk-fo-uicc-mf.html).
Third, since different class is used for SIM APDUs (0xA0) so All APDUs sent from RIL will be directed to fake-UICC by JCRE, since class+instruction is not recognized by normal Java Card. e.g. 0xA0A4 is select for SIM but 0x00A4 is select command for Java Card.
In last step, we will try to send exact same responses a real SIM would send to each APDU.

Maybe it won't work but I think it's worth a try.

Upvotes: 5

Views: 1885

Answers (2)

Ebrahim Ghasemi
Ebrahim Ghasemi

Reputation: 6126

Well, Actually I'm not sure if this solution works or not, and as dear @Vojta mentioned in the comments under his answer I would like to discourage people from the following attempts. It will be difficult, time-consuming and probably with no useful results. He knows a lot more than me in this field.

Anyway, as you wanted I posted my suggestion:

Each file in the system file of the SIM/USIM card is linked to a hexadecimal number as its addresses (AID). These AIDs are defined in GSM and ETSI standards (GSM 11.11 for example). You can write some Javacard applets to simulate that system file.

As SIM/USIM card's AIDs are shorten than JavaCard AIDs, you might need to choose a Java Card that support partial AID selection and use this capability to refer incoming command to its associated applet.

I think you can simulate all the system file inside a single applet also and then make that applet default selected applet.

If you had any success with this solution, please inform us. :)

Upvotes: 1

vojta
vojta

Reputation: 5661

SIM Card (UICC) accessed through SEEK is not the only secure element you can use in your cellphone.

On the market there are other Java Card solutions: mostly based on microSD slot (provided e. g. by GoTrust or Feitian Technologies), which you should be able to access through SEEK.

Some cellphones (Galaxy S3 is not this case, unfortunately) are equipped with a special secure element slot, which you can insert common smart card (mostly by Oberthur) into and access through SEEK (see http://www.nfcworld.com/technology/embedded-secure-element-ese/ for some devices with this feature).

There is an interesting article about SE options: http://nelenkov.blogspot.cz/2012/08/accessing-embedded-secure-element-in.html

If you know some other vendors offering microSD Java Card products, please write them down in comments and I will add them to my post. This answer is not supposed to be any advertisement for the companies mentioned above.

Upvotes: 2

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