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nfc-tools / libfreefare

A convenience API for NFC cards manipulations on top of libnfc.
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ntag21x_is_auth_supported command #112

Closed shad0w82 closed 5 years ago

shad0w82 commented 5 years ago

I'm having a hard time trying to understand the function ntag21x_is_auth_supported, from which the library can discern the tag type. The procedure is transceiving bytes 60 00, but nowhere on NTAG213/15/16 datasheet (https://www.nxp.com/docs/en/data-sheet/NTAG213_215_216.pdf) is mentioned that command. In fact, the command always return -20 (rf timeout error). Here you can see the libnfc log:

debug libnfc.driver.pn53x_usb TX: 00 00 ff 04 fc d4 42 60 00 8a 00 debug libnfc.driver.pn53x_usb RX: 00 00 ff 00 ff 00 debug libnfc.chip.pn53x PN53x ACKed debug libnfc.driver.pn53x_usb RX: 00 00 ff 03 fd d5 43 01 e7 00 debug libnfc.chip.pn53x Chip error: "Timeout" (01), returned error: "RF Transmission Error" (-20))

What am I missing here? Thanks

SloCompTech commented 5 years ago

Hi, yeah, maybe I gave function a little improper name, basically it is function GET_VERSION (if you look at the docs), and only purpose is to differentiate between ntag21x and ultralight tags

shad0w82 commented 5 years ago

Ok i see, but then what's the difference with the function "ntag21x_get_info" (that according to the source code, it's rightly used to retrieve the information on the tag, as per the datasheet)? More over, the "ntag21x_is_auth_supported", apart from having a little improper name, is always going to fail, because the bytes 60 00, is not matching any valid command...

Gf

MaxMaxov93 commented 5 years ago

Ok i see, but then what's the difference with the function "ntag21x_get_info" (that according to the source code, it's rightly used to retrieve the information on the tag, as per the datasheet)? More over, the "ntag21x_is_auth_supported", apart from having a little improper name, is always going to fail, because the bytes 60 00, is not matching any valid command...

Gf

Hey. I have the same issue Chip error: "Timeout" (01), returned error: "RF Transmission Error" (-20)). But I'm just trying to use nfc-list in Kali linux. I don't know if it's a hardware issue. I want to know how it goes in your case. My device is pn532 -> UART USB

shad0w82 commented 5 years ago

Actually I ended up rewriting my own version of libfreefare, with only the features I needed, in QT.

If you are trying to use the nfc-list, the problem is a hardware one. Me too I had that same problem on one pc, but not on one another..I’m using a PN533 with native usb Interface.

MaxMaxov93 commented 5 years ago

Ok, thank you for the answer. I have thought my device (pn532 chip) came broken. But it seems to be something software. Or is it a hardware issue that has to do with pc, not the pn532 itself?

shad0w82 commented 5 years ago

No I think the PN532 it’s ok. My problem was related to the PC I was using.

darconeous commented 5 years ago

Closing to clean up issues. Re-open if closed in error.

realhik commented 4 years ago

I had the same issue. I think the command ist just "0x60", not "0x60 0x00" for GET_VERSION.