NFC chip reading

The chip on Turkish ID cards and passports is read with PassportReader. Accessing the chip needs the document’s serial number, date of birth and expiry date; take them from the document capture result (CapturedModel) and let the user confirm them.

1. Turn on reader mode

NfcAdapter adapter = NfcAdapter.getDefaultAdapter(this);
adapter.enableReaderMode(this, this::onTagDiscovered,
        NfcAdapter.FLAG_READER_NFC_A | NfcAdapter.FLAG_READER_NFC_B,
        null);

Add the BouncyCastle provider when the app starts:

Security.addProvider(new BouncyCastleProvider());

2. Get a nonce and read the chip

When the document is detected, get a transaction-specific nonce from Prove ID for active authentication and read the chip:

void onTagDiscovered(Tag tag) {
    IsoDep isoDep = IsoDep.get(tag);

    ServerCall.generateNonce(new GenerateNonceInputModel(transactionId),
            new TechsignServiceListener<GenerateNonceReturnModel>() {
                @Override
                public void onSuccess(GenerateNonceReturnModel data) {
                    readChip(isoDep, data.getNonce());
                }

                @Override
                public void onFailure(Exception e) { }
            });
}

void readChip(IsoDep isoDep, String nonce) {
    isoDep.setTimeout(60000);
    try {
        // From the document capture (let the user confirm them)
        SimpleDateFormat format = new SimpleDateFormat("dd.MM.yyyy");
        String serialNumber = capturedModel.getSno();
        Date birthDate = format.parse(capturedModel.getBdat());
        Date expireDate = format.parse(capturedModel.getEdat());

        PassportReader reader = new PassportReader(this, new LocalNFCCommandTransmitter(isoDep));
        reader.read(serialNumber, birthDate, expireDate, nonce, new PassportReaderCallback() {
            @Override
            public void result(PassportModel chip) {
                // Send the chip data for validation (below)
            }

            @Override
            public void progress(NFCOperationType type, double progress) {
                // AUTHENTICATION, DG1, DG15, DG2
            }

            @Override
            public void error(Exception e) {
                // See Errors
            }
        });
    } catch (ParseException e) {
        // Dates must be dd.MM.yyyy
    }
}

3. Validate the chip data

IDValidationModel validation = new IDValidationModel(
        chip.getDg1(), chip.getDg2(), chip.getSod(), chip.getDg11(), chip.getDg12(),
        chip.getDg14(), chip.getDg15(), chip.getNonce(), chip.getSignedData());

ServerCall.validateAndSave(new ValidationInputModel(validation, "IDCARD", transactionId),
        new TechsignServiceListener<SaveIdReturnModel>() {
            @Override
            public void onSuccess(SaveIdReturnModel result) {
                ControlEntryModel[] controls = result.getControlResults();
            }

            @Override
            public void onFailure(Exception e) { }
        });