Hello!
I tried to implement password lock protection in my Android app. I was able to set the password and set the AUTH0 byte to 0.
But I'm not able to authenticate the tag. I always get Tag was lost exception. I tried both Android NfcA and MirafeUltralight from Android SDK... and got same result.
Code bellow is how I try to autheticate
Tag tag = savedIntent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
NfcNtag nfca = NfcNtag.get(tag);
try {
nfca.connect();
byte[] pin = new byte[4];
pin[0] = 97;
pin[1] = 97;
pin[2] = 97;
pin[3] = 97;
byte[] response = nfca.pwdAuth(pin);
} catch (IOException e) {
e.printStackTrace();
}finally {
if (nfca != null) {
try {
nfca.close();
}
catch (IOException e) {
Log.e(TAG, "Error closing tag...", e);
}
}
} public byte[] pwdAuth(byte[] password) {
if (password == null) {
return null;
}
if (password.length != 4) {
return null;
}
byte[] req = new byte[5];
byte[] resp;
req[0] = NfcNtagOpcode.PWD_AUTH; //0x2B
try {
System.arraycopy(password, 0, req, 1, 4);
resp = nfca.transceive(req);
} catch (IOException ex) {
ex.printStackTrace(); //Allways ends here
resp = null;
}
return resp; // result will be the PACK
}I used code from bellow
smartrac-sdk-java-android-nfc/NfcNtag.java at master · SMARTRACTECHNOLOGY-PUBLIC/smartrac-sdk-java-a...
