nfc - 无法验证 NTAG213

Question

我正在使用 ACR122U NFC 读取器来密码保护 NTAG213 NFC 标签。我想我已经成功地设置了正确的密码，但之后我无法验证和更改标签。我的身份验证代码如下所示:

#include <winscard.h>
#include <iostream>
#pragma comment(lib, "winscard.lib")

const char *ReaderName = "ACS ACR122 0";
unsigned Password = 0x12345678;

int main()
{
  //Establish context
  SCARDCONTEXT              hContext;
  DWORD SCard_Status1 = SCardEstablishContext(SCARD_SCOPE_USER, NULL, NULL, &hContext);
  if(SCard_Status1 != SCARD_S_SUCCESS)
    return 1;

  //connect to the card
  SCARDHANDLE   hCardHandle;
  DWORD Protocol;
  DWORD SCard_Status2 = SCardConnect(hContext, ReaderName, SCARD_SHARE_SHARED, SCARD_PROTOCOL_T1, &hCardHandle, &Protocol);
  if(SCard_Status2 != SCARD_S_SUCCESS)
  {
    SCardReleaseContext(hContext);
    return 1;
  }

  SCARD_IO_REQUEST Request;
  Request.dwProtocol = Protocol;
  Request.cbPciLength = sizeof(SCARD_IO_REQUEST);
  BYTE TxData[] =
  {
    0xFF, //CLA
    0x00, //INS
    0x00, //P1
    0x00, //P2
    0x08, //LC
    0xD4,
    0x40,
    0x01,
    0x1B, //PWD_AUTH (See data sheet)
    Password,
    Password >> 8,
    Password >> 16,
    Password >> 24,
  };

  BYTE RxData[254];
  unsigned long RxLength = sizeof(RxData);
  DWORD SCard_Status3 = SCardTransmit(hCardHandle, &Request, TxData, sizeof(TxData), NULL, RxData, &RxLength);
  std::cout << "SCard_Status = " << SCard_Status3 << std::endl;
  std::cout << "RxLength = " << RxLength << std::endl;

  SCardDisconnect(hCardHandle, SCARD_EJECT_CARD);
  SCardReleaseContext(hContext);
  return 0;
}

这应该将 PWD_AUTH 命令与 Pwd 一起发送到 NTAG213。如果密码错误，我预计会收到错误；如果密码正确，我预计会收到 PACK 的两个字节。但 SCard_Status 为 SCARD_S_SUCCESS 并且 RxLength 之后为 0。如果我尝试写入标签，则会出现错误。

我无法找到任何说明如何执行此操作的示例。谁能看出我做错了什么吗？

Answer 1

我自己来回答这个问题。我设法通过将 TxData 更改为:

BYTE TxData[] =
{
  0xFF, //CLA
  0x00, //INS
  0x00, //P1
  0x00, //P2
  0x07, //LC
  0xD4, 0x42, //InCommunicateThru
  0x1B, //PWD_AUTH (See data sheet)
  Password,
  Password >> 8,
  Password >> 16,
  Password >> 24,
};

我在 PN532 的数据表中发现命令 InCommunicateThru (D4 42) 作为 InDataExchange (D4 40) 的替代品，PN532 是 ACR122U 内部的 NFC 处理器。