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NXP Semiconductors

UM10663

NXP Reader Library User Manual

UM10663

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User Manual

COMPANY PUBLIC

Rev. 1.2 — 24 July 2013

257412

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From this point nearly to the end is branch for MIFARE Classic card detected.

242

else if (0x08 == (*bSak & 0x08))

243

{

244

debug_printf_msg("Mifare Classic card detected");

Memory of MIFARE Classic is divided into 16 sectors and each sector contains 4 blocks

of 16 byte length. Firstly we need to get access to sector by authentication with key. The

key must agree with key stored in the card for particular sector.

Before authentication we must store the key into key storage area in the EEPROM of the

reader chip. The key is defined array Key[6] – we use a new card here so the key is 6

bytes of 0xFF.

260

PH_CHECK_SUCCESS_FCT(status, phKeyStore_SetKey(&Rc663keyStore, 0, 0,

261

PH_KEYSTORE_KEY_TYPE_MIFARE, &Key[0], 0));

Now the 6 byte key is in key buffer of the crypto unit and retains until next key is buffered

phKeyStore_SetKey()

Performing authentication function loads from the key storage EEPROM area according

blocknumber passed as parameter to authentication function. See section 2.4.2 to

understand parameters of this function.

265

status = phalMfc_Authenticate(&alMfc, 0, PHHAL_HW_MFC_KEYA, 0, 0,

bUid, bLength);

Successful authentication to block 0 gives access to all the other blocks of sector 0.

Although we already have captured UID since Authentication, here is an alternative way:

UID of the card is read from block 0 in sector 0 by Read MIFARE native command. But

this assumes sector 0 has already been authenticated.

280

PH_CHECK_SUCCESS_FCT(status, phalMfc_Read(&alMfc, 0,

281

&bBufferReader[0]));

Now let’s authenticate through block 6 to entire sector 1 – block 4, 5, 6, 7.

313

PH_CHECK_SUCCESS_FCT(status, phalMfc_Authenticate(&alMfc, 6,

314

PHHAL_HW_MFC_KEYA, 0, 0, bUid, bLength));

Block 4 is accessible, so we can write data into. To be correct, 4 bytes should be written

to card EEPROM via

phhalMfc_ WriteValue()

, which ensures correct form of data to be

written. That function is described in section 2.4.4.

320

PH_CHECK_SUCCESS_FCT(status, phalMfc_Write(&alMfc, 4, bBufferReader));

Clear the read buffer to forget written data and later read data can be load buffer and

verified.

324

memset(bBufferReader, '\0', 0x60);