Reply To: Problem authenticating a MIFARE Ultralight EV1 tag

[Zhaoyu Zhang]

Hi Jorge,

Thanks a lot for the detailed explanation. I'm using similar way to handling the exceptions as you do. And I'm using the native NFC API android.nfc.tech.MifareUltralight. However, it doesn't help:(. We'll get TagLostException in both scenarios.

Thanks,
Zhaoyu

    private void authenticate(MifareUltralight ultralight, byte[] password) {

        try {

            byte[] PWD_AUTH_CMD = new byte[password.length + 1];



            //PWD_AUTH code 1Bh [Ref.1 p46]

            PWD_AUTH_CMD[0] = 0x1B;



            int i = 1;

            for (byte b : password) {

                PWD_AUTH_CMD = b;

                i++;

            }

            ultralight.transceive(PWD_AUTH_CMD);

        } catch (TagLostException e) {

            Log.e("### error", "TagLostException while authenticating MifareUltralight message...", e);

            errorTagLost();

        } catch (IOException e) {

            Log.e("### error", "IOException while authenticating tag...", e);

        }

    }

Hi Support Team,

Anyways, thanks for clarification and quick response :)

Zhaoyu

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