How to set a password for the user memory area on the ST25TV02KC Tag?

Rance · ‎2024-10-20

Hi,St Community!

I tried to use the RFAL library that provides support for ST25TV commands such as PresentPasword and WritePassword.

However, it is still not possible to set a password for the user memory area on the card.

My specific operation process is as follows.

The device I used is shown here(NFC08A1+stm32f401)

First, my code is as follows(demo is based on NFC08A1 in NFC6 generated in CUBE MX):

static void demoNfcv( rfalNfcvListenDevice *nfcvDev )
{
#if RFAL_FEATURE_NFCV

    ReturnCode            err;
    uint16_t              rcvLen;
    uint8_t               blockNum = 1;
    uint8_t               rxBuf[ 1 + DEMO_NFCV_BLOCK_LEN + RFAL_CRC_LEN ];                        /* Flags + Block Data + CRC */
    uint8_t               *uid;
    uint8_t               reqFlag;
		uint8_t               pwd[8] = {0x11,0x22,0x33,0x44,0x55,0x66,0x77,0x88};
	
	
		uint8_t               rxBuf_pwd[12];  
	
#if DEMO_NFCV_WRITE_TAG				
    uint8_t               wrData[DEMO_NFCV_BLOCK_LEN] = { 0x00, 0x00, 0x00, 0x00};             /* Write block example */
#endif /* DEMO_NFCV_WRITE_TAG */

    uid     = nfcvDev->InvRes.UID;
    reqFlag = RFAL_NFCV_REQ_FLAG_DEFAULT;

    #if DEMO_NFCV_USE_SELECT_MODE
        /*
        * Activate selected state
        */
        err = rfalNfcvPollerSelect( reqFlag, nfcvDev->InvRes.UID );
        platformLog(" Select %s \r\n", (err != RFAL_ERR_NONE) ? "FAIL (revert to addressed mode)": "OK" );
        if( err == RFAL_ERR_NONE )
        {
            reqFlag = (RFAL_NFCV_REQ_FLAG_DEFAULT | RFAL_NFCV_REQ_FLAG_SELECT);
            uid     = NULL;
        }
    #endif /* DEMO_NFCV_USE_SELECT_MODE */

    /*
    * Read block using Read Single Block command
    * with addressed mode (uid != NULL) or selected mode (uid == NULL)
    */
    err = rfalNfcvPollerReadSingleBlock(reqFlag, uid, blockNum, rxBuf, sizeof(rxBuf), &rcvLen);
    platformLog(" Read Block: %s %s\r\n", (err != RFAL_ERR_NONE) ? "FAIL": "OK Data:", (err != RFAL_ERR_NONE) ? "" : hex2Str( &rxBuf[1], DEMO_NFCV_BLOCK_LEN));
		
		err = rfalST25xVPollerGetRandomNumber( RFAL_NFCV_REQ_FLAG_DEFAULT,uid,rxBuf_pwd, sizeof(rxBuf_pwd),&rcvLen );
		platformLog(" GetRandomNumber: %s %s\r\n", (err != RFAL_ERR_NONE) ? "FAIL": "OK Data:", (err != RFAL_ERR_NONE) ? "" : hex2Str( &rxBuf_pwd[1], 11));
		
		err =  rfalST25xVPollerPresentPassword( RFAL_NFCV_REQ_FLAG_DEFAULT,uid,0x01,pwd,8);
		platformLog(" PresentPassword	ReturnCode is: %d \r\n", err);
		err =  rfalST25xVPollerWritePassword( RFAL_NFCV_REQ_FLAG_DEFAULT,uid,0x01,pwd,8);
		platformLog(" WritePassword	ReturnCode is: %d \r\n", err);
    #if DEMO_NFCV_WRITE_TAG /* Writing example */
        err = rfalNfcvPollerWriteSingleBlock(reqFlag, uid, blockNum, wrData, sizeof(wrData));
        platformLog(" Write Block: %s Data: %s\r\n", (err != RFAL_ERR_NONE) ? "FAIL": "OK", hex2Str( wrData, DEMO_NFCV_BLOCK_LEN) );
        err = rfalNfcvPollerReadSingleBlock(reqFlag, uid, blockNum, rxBuf, sizeof(rxBuf), &rcvLen);
        platformLog(" Read Block: %s %s\r\n", (err != RFAL_ERR_NONE) ? "FAIL": "OK Data:", (err != RFAL_ERR_NONE) ? "" : hex2Str( &rxBuf[1], DEMO_NFCV_BLOCK_LEN));
    #endif /* DEMO_NFCV_WRITE_TAG */

#endif /* RFAL_FEATURE_NFCV */
}

Next I try to print out the FIFO data as follows:

1.The GetRandomNumber function is normal

2.PresentPassword's ReturnCode is incorrect

3.WritePassword's ReturnCode is incorrect ,too.

so why is the value of ReturnCode 5?

And why am I still calling the api function of the demo? but invalid request or requested function can't be executed at the moment.

So, in order to encrypt the block, what exactly should I do?! What configurations do I need to set up first?!

Supplementary instruction,

my print function is as follows

Rance · ‎2024-10-21

Hi Rance

If you want to set a password for the user memory area on the card.

You need to follow these steps

1.Get 2 bytes Random Number

2.Make the password and Random Number XOR.

3.Use the Present Password function to enter secure session mode.

4.Start writing the password that you want

Notice：

The initial password is 0x00

View solution in original post

Rance · ‎2024-10-21