NFC NTAG424 DNA

Shubham9494 — Sat, 02 Dec 2023 14:54:15 GMT

Hi Everyone , I need to make a function which can communicate with NTAG 424 and can authenticate it also. I tried the but got length error 917E. Please take a look and help me on it where I did mistake.

Code is in android kotlin

fun selectApdu(): ByteArray {
    val cmd = "9071000002000000"
    val selectaId = "D2760000850101"

    val selectAID = byteArrayOf(
        0xD2.toByte(), 0x76.toByte(), 0x00.toByte(), 0x00.toByte(),
        0x85.toByte(), 0x01.toByte(), 0x01.toByte()
    )
    Log.i(TAG, "selectApdu: ${selectAID.size}")
    try {
        val commandApdu = ByteArray(11 + selectAID.size)
        commandApdu[0] = 0x90.toByte()  // CLA
        commandApdu[1] = 0x71.toByte()  // INS
        commandApdu[2] = 0x00.toByte()  // P1
        commandApdu[3] = 0x00.toByte()  // P2
        commandApdu[4] = 0x02.toByte()  // Lc (fixed at 2 bytes for the AID length)
        selectAID.copyInto(commandApdu, 7)

        // Replace the last three bytes
        commandApdu[commandApdu.size - 3] = 0x00.toByte()
        commandApdu[commandApdu.size - 2] = 0x00.toByte()
        commandApdu[commandApdu.size - 1] = 0x00.toByte()
        Log.e(TAG, "selectApdu: ${getByteArrayToString(commandApdu)}" )
        return commandApdu
    } catch (e: Exception) {
        e.printStackTrace()
        Log.e(TAG, "selectApdu: ${e.message}" )
        return byteArrayOf()
    }
}

Thanks in advance.

Re: NFC NTAG424 DNA

KaiLi — Mon, 04 Dec 2023 08:08:53 GMT

Hello @Shubham9494

Please refer to chapter 6 of AN12196 (https://www.nxp.com.cn/docs/en/application-note/AN12196.pdf) to implement your application.

kelly

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