CODEWITHSUNDEEP
androidsmartcardapdu
Taras
Taras

Reputation: 2576

APDU GET DATA not supported command

I'm testing APDU commands transmitting, and I've found a strange issue, for GET DATA command 00:CA:7F:68 I receive an error:

6D00: "Instruction code not supported or invalid"

What can be the problem??? I'm able to read ATR, send SELECT command. Thanks in advance.

Upvotes: 0

Views: 2963

Answers (2)

guidot
guidot

Reputation: 5333

As frequently mentioned, ISO 7816-4 is a weak standard: no card needs to support all commands and can still claim to be standard-compliant. So it may be that your card does

  • not at all
  • just not in the current state
  • just not in the application/DF where you try it (because there no DOs are present)

understand the command, but I don't think it has to do with the 7F68 object number.

Adding an LE byte (as suggested) is definitely worth a try, even if I would expect 67 00 for that cause.

Upvotes: 1

Thomas
Thomas

Reputation: 2767

Are you trying to read the data from the file 7f68? Can you give more background info? In any case, I think you may be missing the last byte (LE) of the apdu, where you specify the maximum amount of bytes expected in your answer.

Upvotes: 1

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