CodeWarrior Development Tools中的主题 Re: Authentication error in NXP Library

Authentication error in NXP Library

raj_shinde — Fri, 15 Nov 2019 08:02:11 GMT

I am developing an android app to authenticate mifare UltraLightC chip ,but the problem i am facing while authenticating chip is , it always throws an exception, every time even if it is authenticated or not (i.e .authenticate() method of NXPlibrary), and how can we confirm that our key is being successfully authenticated as per an example in datasheet provided by mifare, they are just using an log below the .authenticate() method so, is this a proper way to authenticate an key ? while debugging i found that this method always throws an exception message(i.e NxpNFCLibException) rather than ideally an authenticating method should give an response for example authenticated true or false, it do not return anything, so how can we confirm whether our key is properly authenticated i am attaching my debugging logs with it ? Please provide me a solution or an example on how to authenticate key and how to check whether it is authenticating properly or not ?

Version of NXP Library i am using

nxpnfcandroidlib-1.7

Re: Authentication error in NXP Library

jimmychan — Mon, 25 Nov 2019 06:36:33 GMT

This may help you. authentication - Android: Authenticating with NXP MiFare Ultralight C - Stack Overflow

Re: Authentication error in NXP Library

marcoperrone — Tue, 01 Jun 2021 09:44:40 GMT

Hi to all,

I tried to use the code suggested by NXP TechSupport @jimmychan to authenticate a Mifare Ultralight C with an Android smartphone.
Here the the data between the the app and the tag:

My Key is: 42 52 45 41 4B 4D 45 49 46 59 4F 55 43 41 4E 21

I start communication TAG : 1A 00

The TAG answer with (encoded) RndB: AF 69 EC C8 F7 CA DC 1A C8

so the the IV for next communication become: 69 EC C8 F7 CA DC 1A C8

the RndB (decoded) is: CB 0C AC EE F2 76 F1 7E

the RndB' (rotate) is: 0C AC EE F2 76 F1 7E CB

the RndA is: C9 60 0A DC EB 08 FD C4

The value sent to the tag is: AF encoded (RndA + RndB')

AF 90 79 9A 6D 73 E9 51 49 C7 AA 66 D9 0C 08 BE C5

When I sent this I have an exception Transceive failed (like the data sent is not correct)

I check on this site http://tripledes.online-domain-tools.com/

And the value sent is correct

I hope You can help me

Best Regards

Marco

Re: Authentication error in NXP Library

marcoperrone — Tue, 01 Jun 2021 09:45:01 GMT

Hi @jimmychan,

Did You use the code suggested successfully, because I have an exception during the authentication, I explained all in my other post.
Thank You

Best Regards

Marco