как установить восьмой бит на ноль (чтение данных из смарткарты)

Question

Как установить восьмой бит на ноль? Иногда я получаю неправильный файл. Что не так с p1, p2?

CommandAPDU(cla, ins, p1, p2, ne);

                CommandAPDU readBinaryAPDU = new CommandAPDU(0x00, 0xB0, offset >> 8, offset & 0xFF, 0xff);

    public byte[] readCard(ResponseAPDU responseAPDU, CardChannel channel, byte[] fid, FidAdjusted fidEnum) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        int offset = 0;
        try {
            System.out.println("Reading: " + fidEnum.name());
            if ((fid[0] != 0x00 && fid[1] != 0x05) && (fid[0] != 0x00 && fid[1] != 0x02)) {
                //select MF - Solo para posicionarse
                //AID: ‘FF 54 41 43 48 4F’ dla aplikacji tacho 1. gen
                //AID: ‘FF 53 4D 52 44 54’ dla aplikacji tacho 2. gen
                CommandAPDU SELECT_MF = new CommandAPDU(0x00, 0xA4, 0x04, 0x0C, OperationHelper.hexToByteAr("ff,54,41,43,48,4f"), 0x00, 0x06);
                responseAPDU = channel.transmit(SELECT_MF);
                System.out.println("Command select MF response: " + Integer.toHexString(responseAPDU.getSW1()));
            }
            // select EF
            CommandAPDU SELECT_EF = new CommandAPDU(0x00, APDUCommand.SELECT_FILE.getCommand(), 0x02, 0x0C, fid, 0x00, 0x02);
            responseAPDU = channel.transmit(SELECT_EF);
            System.out.println("Command select EF response: " + Integer.toHexString(responseAPDU.getSW1()));
            System.out.println("Begin reading... for " + fidEnum.name());
            do {
                // read binary
                CommandAPDU readBinaryAPDU = new CommandAPDU(0x00, 0xB0, offset >> 8, offset & 0xFF, 0xff);
                responseAPDU = channel.transmit(readBinaryAPDU);
                int sw1 = responseAPDU.getSW1();
                baos.write(responseAPDU.getData());
                switch (sw1) {
                    case 0x90: {
                        System.out.println("(Good)" + Integer.toHexString(sw1));
                        offset += responseAPDU.getData().length;
                        break;
                    }
                    case 0x67: {
                        System.out.println("(incorrect Lc or Le) (Wrong) " + Integer.toHexString(sw1));
                        break;
                    }
                }
            } while (responseAPDU.getData().length == 0xff);
            System.out.println("Reading end: " + fidEnum.name());
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return baos.toByteArray();
    }

Выход на консоль:

Begin reading... for EF_ICC
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_ICC
5
Reading: EF_IC
Command select EF response: 90
Begin reading... for EF_IC
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_IC
12032
Reading: EF_DIR
Command select MF response: 90
Command select EF response: 6a
Begin reading... for EF_DIR
Reading end: EF_DIR
1280
1281
Reading: EF_APPLICATION_IDENTIFICATION
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_APPLICATION_IDENTIFICATION
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_APPLICATION_IDENTIFICATION
49408
Reading: EF_CARD_CERTIFICATE
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_CARD_CERTIFICATE
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_CARD_CERTIFICATE
49416
Reading: EF_CA_CERTIFICATE
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_CA_CERTIFICATE
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_CA_CERTIFICATE
1312
Reading: EF_IDENTIFICATION
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_IDENTIFICATION
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_IDENTIFICATION
1294
Reading: EF_CARD_DOWNLOAD
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_CARD_DOWNLOAD
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_CARD_DOWNLOAD
1313
Reading: EF_DRIVING_LICENSE_INFO
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_DRIVING_LICENSE_INFO
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_DRIVING_LICENSE_INFO
1282
Reading: EF_EVENTS_DATA
Command select EF response: 90
Begin reading... for EF_EVENTS_DATA
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_EVENTS_DATA
1283
Reading: EF_FAULTS_DATA
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_FAULTS_DATA
(Good)90
(Good)90
(Good)90
(Good)90
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_FAULTS_DATA
1284
Reading: EF_DRIVER_ACTIVITY_DATA
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_DRIVER_ACTIVITY_DATA
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_DRIVER_ACTIVITY_DATA
1285
Reading: EF_VEHICLES_USED
Command select EF response: 90
Begin reading... for EF_VEHICLES_USED
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(Good)90
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_VEHICLES_USED
1286
Reading: EF_PLACES
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_PLACES
(Good)90
(Good)90
(Good)90
(Good)90
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_PLACES
1287
Reading: EF_CURRENT_USAGE
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_CURRENT_USAGE
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_CURRENT_USAGE
1288
Reading: EF_CONTROL_ACTIVITY_DATA
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_CONTROL_ACTIVITY_DATA
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_CONTROL_ACTIVITY_DATA
1314
Reading: EF_SPECIFIC_CONDITIONS
Command select MF response: 90
Command select EF response: 90
Begin reading... for EF_SPECIFIC_CONDITIONS
(Good)90
(incorrect Lc lub Le) (Wrong) 67
Reading end: EF_SPECIFIC_CONDITIONS

Process finished with exit code 0

Answer 1

Чтобы установить восьмой бит на ноль, ваша битовая маска должна быть 0111 1111 в двоичном, это 0x7F в шестнадцатеричном формате.

offset & 0x7F

Я не знаю, что делает ваш код, но если 3-й и Предполагается, что для четвертых параметров CommandAPDU заданы только последние 7 битов, примените маску.

Answer 2

Для READ BINARY P1 и P2 представляют начальное смещение, причем P1 является самым старшим байтом. Из этого смещения в файл извлекаются данные.

Если ваше смещение> = 0x8000, это ошибка для кода инструкции 0xB0 (потому что тогда P1 будет интерпретироваться как короткий идентификатор EF). (Следовательно, 32 кБайта - важный предел размера.)

Самый старший бит P2 не имеет особого значения, поэтому его маскировка не дает никаких преимуществ, кроме получения данных, отличных от ожидаемых. (Я бы посчитал это ошибкой.)

Подробнее, как всегда, см. ISO 7816, часть 4.