如何为主机卡仿真的存储数据定义APDU? [英] How to define an APDU for STORE DATA for Host Card Emulation?

问题描述

我一直在寻找有关如何为我的应用定义APDU的全球平台规范，它将使用主机卡仿真(HCE).我的应用程序应该具有一部通过HCE表现为NFC标签的电话，另一部电话充当NFC阅读器.我试图在电话之间传输的任意数据只是一个包含ID号的简单字符串，但是我不确定如何在代码中应用它.我已经看过不同字节命令的含义，但是我真的不确定如何应用它.

I have been looking in the Global Platform Spec on how to define an APDU for my app which will use Host Card Emulation (HCE). My app is supposed to have one phone behaving like an NFC tag through HCE and another phone acting as the NFC reader. The arbitrary data that i am trying to transfer between the phones is just a simple string containing an ID number, but I'm not really sure how to apply it in the code. I have looked at what the different byte commands mean but I'm really not sure how to apply it.

我认为我需要使用STORE DATA命令，但是我不确定如何直观地做到这一点，并且不太了解.我目前正在关注HCE方面，而不是读者方面.

I think I need to use the STORE DATA command but I'm not sure how to intuitively do it and don't really understand. I am currently looking at the HCE side rather than the reader side.

到目前为止，这是我在HCE方面的代码

This is my code so far for the HCE side

public class SecondaryActivity extends HostApduService {

@Override
public void onDeactivated(int reason) {

}

@Override
public byte[] processCommandApdu(byte[] commandApdu, Bundle extras) {
    String inboundApduDescription;
    byte[] responseApdu;

    if (Arrays.equals(AID_SELECT_APDU, commandApdu)) {
        inboundApduDescription = "Application selected";
        Log.i("HCEDEMO", inboundApduDescription);
        byte[] answer = new byte[2];
        answer[0] = (byte) 0x90;
        answer[1] = (byte) 0x00;
        responseApdu = answer;
        return responseApdu;

    }
    return commandApdu;
}

private static final byte[] AID_SELECT_APDU = {
        (byte) 0x00,
        (byte) 0xA4,
        (byte) 0x04,
        (byte) 0x00,
        (byte) 0x07,
        (byte) 0xF0, (byte) 0x39, (byte) 0x41, (byte) 0x48, (byte) 0x14, (byte) 0x81, (byte) 0x00,
        (byte) 0x00
};

private static final byte[] STORE_DATA = {
        (byte) 0x00,
        (byte) 0xA4,
        (byte) 0x04,
        (byte) 0xA5, // forproprietary data according to the spec
        (byte) 0xE2,
        (byte) 0x66, (byte) 0x39, (byte) 0x41, (byte) 0x48, (byte) 0x14, (byte) 0x81, (byte) 0x00,
        (byte) 0x00
};

private static final byte[] INSTALL = {
        (byte) 0x00,
        (byte) 0x00,
};

}

如何将数据从HCE手机发送到阅读器手机? 我想念什么? 需要做什么?

How do I send the data from the HCE phone to the reader phone? What am I missing? What needs to be done?

推荐答案

您几乎可以为HCE定义任何APDU命令.仅需要初始的SELECT(通过AID)命令.之后，只要遵守命令/响应APDU结构的ISO/IEC 7816规则，并遵循有效的CLA，INS，和状态字的值.

You can define virtually any APDU command for HCE. Only the initial SELECT (by AID) command is required. After that, you can create your own command set (or try to follow ISO/IEC 7816-4 commands) as long as you obey the rules of ISO/IEC 7816 for command/response APDU structure, and stick to valid CLA, INS, and status word values.

由于您只想传输一个ID，因此您可以直接发送该ID来响应SELECT命令:

Since you only want to transfer an ID, you could send this ID directly in response to the SELECT command:

private static final String ID = "1234567890"

@Override
public byte[] processCommandApdu(byte[] commandApdu, Bundle extras) {
    byte[] responseApdu = new byte[] { (byte)0x6F, (byte)0x00 };

    if ((commandApdu != null) && (commandApdu.length >= 4)) {
        if ((commandApdu[0] == (byte)0x00) && (commandApdu[1] == (byte)0xA4) && (commandApdu[2] == (byte)0x04) && (commandApdu[3] == (byte)0x00)) {
            Log.i("HCEDEMO", "Application selected");

            byte[] id = ID.getBytes(Charset.forName("UTF-8"));
            responseApdu = new byte[id.length + 2];
            System.arraycopy(id, 0, responseApdu, 0, id.length);
            responseApdu[id.length] = (byte)0x90;
            responseApdu[id.length + 1] = (byte)0x00;
        }
    }
    return responseApdu;
}

这篇关于如何为主机卡仿真的存储数据定义APDU?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！