使用SCL010获取Mifare Ultralight的UID [英] Get UID of Mifare Ultralight with SCL010

问题描述

我想获得Mifare Ultralight NFC标签的UID。
在Java中我有这样的代码：

I want get the UID of the Mifare Ultralight NFC tag. In Java I have this code:

TerminalFactory factory = TerminalFactory.getDefault();
List<CardTerminal> terminals = factory.terminals().list();
System.out.println("Terminals: " + terminals);

CardTerminal terminal = terminals.get(0);

Card card = terminal.connect("*");
System.out.println("card: " + card);
CardChannel channel = card.getBasicChannel();

ResponseAPDU answer = channel.transmit(new CommandAPDU(0xFF, 0xCA, 0x00, 0x00, 0x00));
byte[] uid = answer.getBytes();

问题是我收到两个字节而不是UID。
有什么问题？ APDU是否正确？

The problem is that I receive two bytes and not the UID. What's the problem? Is the APDU correct?

推荐答案

您实际使用的命令并非您所期望的那样。

The command you are actually using is not what you might have expected.

使用此阅读器获取UID /序列号/枚举标识符的正确命令APDU是：

The correct command APDU to get the UID/serial number/enumeration identifier with this reader is:

+------+------+------+------+------+
| CLA  | INS  |  P1  |  P2  |  Le  |
+------+------+------+------+------+
| 0xFF | 0xCA | 0x00 | 0x00 | 0x00 |
+------+------+------+------+------+

但是，您使用的构造函数定义为：

However, the constructor you are using is defined as:

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

所以

new CommandAPDU(0xFF, 0xCA, 0x00, 0x00, 0x00)

您正在创建具有以下参数的C-APDU CLA = 0xFF ， INS = 0xCA ， P1 = 0x00 ， P2 = 0x00 。到目前为止，这与上面的APDU相同。但最后一个参数是 Ne = 0x00 。 Ne = 0 表示预期响应字节数为零（而Le = 0表示预期响应字节数为（最多）256）。

you are creating a C-APDU with the following parameters CLA = 0xFF, INS = 0xCA, P1 = 0x00, P2 = 0x00. So far this is the same as the above APDU. But the last parameter is Ne = 0x00. Ne = 0 means that the number of expected response bytes is zero (whereas Le = 0 would mean that the number of expected response bytes is (up to) 256).

这样可以有效地创建以下Case-1 APDU：

This results in effectively creating the following Case-1 APDU:

+------+------+------+------+
| CLA  | INS  |  P1  |  P2  |
+------+------+------+------+
| 0xFF | 0xCA | 0x00 | 0x00 |
+------+------+------+------+

所以最多你会得到2字节状态字作为响应（表示成功 0x90 0x00 或表示状态代码错误，如 0x6X 0xXX ）。

So at most you will get the 2-byte status word as a response (either indicating success with 0x90 0x00 or indicating an error with a status code like 0x6X 0xXX).

因此您可以使用字节数组来形成APDU ：

So you can either use a byte array to form your APDU:

new CommandAPDU(new byte[] { (byte)0xFF, (byte)0xCA, (byte)0x00, (byte)0x00, (byte)0x00 } )

或者你可以为<$ c $指定一个合适的值c> Ne ：

new CommandAPDU(0xFF, 0xCA, 0x00, 0x00, 256)

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