AnsweredAssumed Answered

NTAG 424 DNA, CMAC calculation fails

Question asked by Stéphane Joly on Aug 6, 2019
Latest reply on Aug 15, 2019 by Stéphane Joly

Hello,

I'm working with the NTAG 424 DNA.
I'm trying to calculate the CMAC as described in the document "an507215 - AN12196 NTAG 424 DNA Features and hints", page 11, but I don't have the same result.
https://ntag.nxp.com/424?uid=04C767F2066180&ctr=000001&c=54A45B2C3A558765

KSDMFileRead: 00000000000000000000000000000000
AppKey      : 00000000000000000000000000000000
UID         : 04C767F2066180
SDMReadCtr  : 010000

SV2               : 3CC30001008004C767F2066180010000
KSesSDMFileReadMAC: 0EC94BE3E0664FAF2BE300DFB16E1B66

DynamicFileData   : ntag.nxp.com/424?uid=04C767F2066180&ctr=000001&c=
DynamicFileDataHex: 6E7461672E6E78702E636F6D2F3432343F7569643D3034433736374632303636313830266374723D30303030303126633D
CMAC (full) : A1DBED758F37BACEF0916F7602EC913C
CMAC        : DB7537CE9176EC3C


Whit is wrong in my calculation ???

Best Regards, Stéphane

Outcomes