NTAG424 Authentication

tusharv — Mon, 04 Dec 2023 06:02:32 GMT

I'm having issues with authenticating an NTAG424 tag in iOS. I tried using the command 9071000002000000 as the NXP documentation suggests but I keep getting a (Sw1 - 145 and Sw2 - 126 ) 917E length error message. Can you help me fix this? I've included my iOS Swift code for you to check.

I tried to change expectedResponseLength is 0 so it'll gave
Invalid expectedResponseLength value; should be from 1 to 65536 or -1.
Then I change it to -1 so it will gave same (Sw1 - 145 and Sw2 - 126 ) 917E.
Can you please help me in that I have also included my code snippet:

func tagReaderSession(_ session: NFCTagReaderSession, didDetect tags: [NFCTag]) {

guard let firstTag = tags.first else { return }

session.connect(to: firstTag) { (error) in

if case let .iso7816(tag) = firstTag {

let instructionClass: UInt8 = 0x90

let instructionCode: UInt8 = 0x71

let p1Parameter: UInt8 = 0x00

let p2Parameter: UInt8 = 0x00

let data: Data = Data([0x02, 0x00, 0x00])

let expectedResponseLength = -1

let command = NFCISO7816APDU(instructionClass: instructionClass, instructionCode: instructionCode, p1Parameter: p1Parameter, p2Parameter: p2Parameter, data: data, expectedResponseLength: expectedResponseLength)

tag.sendCommand(apdu: command) { (response, sw1, sw2, error) in

guard error == nil else {

print("Error sending command: \(error!)")

return

}

print("Response: \(response)")

print("SW1: \(sw1), SW2: \(sw2)")

}

Re: NTAG424 Authentication

KaiLi — Fri, 08 Dec 2023 12:21:09 GMT

Hello @tusharv

Please refer to Chapter 6 of AN12196 to modify your debugging code.

https://www.nxp.com.cn/docs/en/application-note/AN12196.pdf

kelly

topic NTAG424 Authentication in NFC

NTAG424 Authentication

Re: NTAG424 Authentication