CODEWITHSUNDEEP
nfcsmartcardjavacardapduiso-7816-4
johnnyrainbow
johnnyrainbow

Reputation: 1

ISO 7816-4 How to construct this C-APDU to write?

I'm interfacing with a smart card (ISO 7816-4)

I have been given the below C-APDU to read a value:

CLA = 0x90
INS = 0x4C
p1 = 0x00
p2 = 0x00
length = 4
parameters = empty

Which returns the response 00000 2f4 9000

(9000 being what I understand to be the SW1/SW2, and the 2f4 part of that response contains the relevant data that I want to change)

Given this provided info, is it possible to determine what modifications to this C-APDU would I need to make to instead UPDATE this data (2f4) to be a different value?

I am quite new to this, and am trying to learn, so thank you for your responses.

Upvotes: 0

Views: 713

Answers (1)

Andrew
Andrew

Reputation: 10152

My understanding is that CLA of 90 means a proprietary command set and an instruction (INS) 4C does not match any of the industry instruction commands.

Thus as this looks like a proprietary read command it is most likely that the update command is proprietary to the hardware you are issuing it to, so impossible to guess what it should be.

Upvotes: 1

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