01 00 80 Signature problem

[igor90ns]

Hi,

I am sorry for asking unrelated question to your project, but I think that this project have most valuable info regarding ddd files in its open and closed issues .
I have made android app that reads driver card (first gen for now) via otg smart card reader. I can read all files from card but I have problem to find parts of data that begins with 01 00 80. Googling 24/7 brought me to post in your closed issues, so now I know that it represent some kind of signature , but I don't know how to generate or extract it from card.

Well i have to ask again sorry, maybe im dumb or whatever.

Don't worry :) it's not easy.

Everything is ok:
05 04 - Driver Activity Data
01 - means there is still a signature (gen 1)
00 80 - 0x0080 = 128 dec

After 128 bytes (containing the signature for 05 04) there is 05 05 - so it's ok

You can only find data for gen 2 by checking 3 byte.
You could also check the length or content of a given EF file and in case of an error it means that it is gen 2 but it is not an optimal solution.

Unfortunately, I don't know C# well and I can't help you with the code from this project. If I find some time, I can look at this code, but I don't know if I can help you.

Originally posted by @mpi-wl in #42 (comment)