Mifare Classic 1K: Authentication Error after Multiple Writes about nfc-pcsc HOT 10 CLOSED

@therealri I think that the problem is here:

I am looking into the technical documentation of Mifare Classic 1K.

Section 8.6 is about Memory organization.

... memory is organized in 16 sectors of 4 blocks. One block
contains 16 bytes.

When accessing these blocks with this library, blocks are numbered as follows:

• sector 0:
  • block 0 – manufacturer data (read only)
  • block 1 – data block
  • block 2 – data block
  • block 3 – sector trailer
• sector 1:
  • block 4 – data block
  • block 5 – data block
  • block 6 – data block
  • block 7 – sector trailer
• sector 2:
  • block 8 – data block
  • block 9 – data block
  • block 10 – data block
  • block 11 – sector trailer
• and so on

That's important, it's that the last block in each sector is "sector trailer" (see Section 8.6.3), which contains access conditions for the other 3 data blocks.

So block 7, which you are trying to write to in your code, is not for data. After you write to it, it changes access conditions (including key) and you cannot authenticate your card then.

I don't have any Mifare Classic card to test it, but according to documentation it is quite clear.

Could you please update your code (remove interaction with block 7, see updated gist here) and test it with a NEW BLANK card if it works?

Hope it helps and looking forward to your answer.

PS Don't forget to star ⭐️ my library, if you find it useful. 😃 Thanks.

from nfc-pcsc.

Hey @pokusew,

Thanks so much and sorry for not getting back to you sooner, I have been travelling.

I also needed to get some extra Mifare Classic 1K Stock.

I have read through your comments and see where I went wrong on the configuration. I appreciate the updated code and all your help and time!

I have tested and it works perfectly, I have a clear understanding of the Mifare Classic 1K Data Layout now :)

Thanks so much!

from nfc-pcsc.

Hi @therealri,

Just to clarify:
Does the script fail always (so you cannot write any data) or does it work just for the first time (meaning that it allows you to write data just once)?

Thanks for your answer.

from nfc-pcsc.

Hey @pokusew,

So it works just the first time but thereafter the card becomes unusable.

So yes, it allows me to write data just once using the Exact Script in the Gist and thereafter it's not possible use the card again.

Thanks!

from nfc-pcsc.

@therealri And does it work when you restart the script (CTRL-C and run again)?

from nfc-pcsc.

@therealri I have got the idea, where the problem comes from. ❗️❗️❗️

from nfc-pcsc.

Hi @therealri,

I have just noticed another problem in you gist, on line 100, 104, 108, 112 you forgot to add the third, blockSize, argument 16 (4, 16, 16). It probably causes unneeded read operations.

Just to be sure, you probably do know it, 16bit integer takes just 2 bytes, not 16 bytes (1 bytes = 8 bits). So before writing only 2-byte 16-bit integer into 16-byte unsafely-allocated Buffer, add data.fill(0), more info here.

I fixed all these things in my fork here. Take a look!

Also let me know, if everything works for you as expected, and I will close the issue then. Thanks.

Hope it helps.

PS Don't forget to star ⭐️ my library, if you find it useful. 😃 Thanks.

from nfc-pcsc.

it is not working with angular 6 and it throwing error while importing like "nfc is not a constructor".
import {NFC} from 'nfc-pcsc' throwing error
ERROR in ./node_modules/bindings/bindings.js
Module not found: Error: Can't resolve 'fs' in 'C:\Users\Admin\Desktop\electronapp\node_modules\bindings'
ERROR in ./node_modules/bindings/bindings.js
Module not found: Error: Can't resolve 'path' in 'C:\Users\Admin\Desktop\electronapp\node_modules\bindings'

reason i found fs module will not work with angular 6. by inbuilt nfc containing fs .

because of these reason i accessed nfc from html and i declared in angular 6 component like "declare var NFC: any; "
because of above i am getting nfc is not a constructor

from nfc-pcsc.

@therealri I have been having troubles trying to read some data from my Mifare Class 1k card. Do you think you could spare some time and help out?

from nfc-pcsc.

Hi @fabioloreggian, what troubles do you have? I am happy to help. 🙂

from nfc-pcsc.