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Mifare Classic emulation fixes (#1566)

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* Add fix for field
* More small bugfixes
* Clean up
This commit is contained in:
Astra 2022-08-09 18:45:52 +03:00 committed by GitHub
parent ca23d0c207
commit 01eb92db06
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 20 additions and 5 deletions
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7
firmware/targets/f7/furi_hal/furi_hal_nfc.c
View File

@ -341,13 +341,13 @@ void furi_hal_nfc_listen_start(FuriHalNfcDevData* nfc_data) {
if(nfc_data->uid_len == 4) {
pt_memory[12] = nfc_data->sak & ~FURI_HAL_NFC_UID_INCOMPLETE;
} else {
pt_memory[12] = nfc_data->sak | FURI_HAL_NFC_UID_INCOMPLETE;
pt_memory[12] = FURI_HAL_NFC_UID_INCOMPLETE;
}
pt_memory[13] = nfc_data->sak & ~FURI_HAL_NFC_UID_INCOMPLETE;
pt_memory[14] = nfc_data->sak & ~FURI_HAL_NFC_UID_INCOMPLETE;
st25r3916WritePTMem(pt_memory, sizeof(pt_memory));
// Go to sence
// Go to sense
st25r3916ExecuteCommand(ST25R3916_CMD_GOTO_SENSE);
}
@ -507,6 +507,9 @@ static bool furi_hal_nfc_transparent_tx_rx(FuriHalNfcTxRxContext* tx_rx, uint16_
uint8_t rxe = 0;
uint32_t start = DWT->CYCCNT;
while(true) {
if(!rfalIsExtFieldOn()) {
return false;
}
if(furi_hal_gpio_read(&gpio_nfc_irq_rfid_pull) == true) {
st25r3916ReadRegister(ST25R3916_REG_IRQ_MAIN, &rxe);
if(rxe & (1 << 4)) {

18
lib/nfc/protocols/mifare_classic.c
View File

@ -771,6 +771,7 @@ bool mf_classic_emulator(MfClassicEmulator* emulator, FuriHalNfcTxRxContext* tx_
// Read command
while(!command_processed) {
if(!is_encrypted) {
crypto1_reset(&emulator->crypto);
memcpy(plain_data, tx_rx->rx_data, tx_rx->rx_bits / 8);
} else {
if(!furi_hal_nfc_tx_rx(tx_rx, 300)) {
@ -803,7 +804,7 @@ bool mf_classic_emulator(MfClassicEmulator* emulator, FuriHalNfcTxRxContext* tx_
access_key = MfClassicKeyB;
}
uint32_t nonce = prng_successor(DWT->CYCCNT, 32);
uint32_t nonce = prng_successor(DWT->CYCCNT, 32) ^ 0xAA;
uint8_t nt[4];
uint8_t nt_keystream[4];
nfc_util_num2bytes(nonce, 4, nt);
@ -858,7 +859,7 @@ bool mf_classic_emulator(MfClassicEmulator* emulator, FuriHalNfcTxRxContext* tx_
uint32_t cardRr = ar ^ crypto1_word(&emulator->crypto, 0, 0);
if(cardRr != prng_successor(nonce, 64)) {
FURI_LOG_T(TAG, "Wrong AUTH! %08X != %08X", cardRr, prng_successor(nonce, 64));
// Don't send NACK, as tag don't send it
// Don't send NACK, as the tag doesn't send it
command_processed = true;
break;
}
@ -897,7 +898,18 @@ bool mf_classic_emulator(MfClassicEmulator* emulator, FuriHalNfcTxRxContext* tx_
} else {
if(!mf_classic_is_allowed_access(
emulator, block, access_key, MfClassicActionDataRead)) {
memset(block_data, 0, 16);
// Send NACK
uint8_t nack = 0x04;
if(is_encrypted) {
mf_crypto1_encrypt(
&emulator->crypto, NULL, &nack, 4, tx_rx->tx_data, tx_rx->tx_parity);
} else {
tx_rx->tx_data[0] = nack;
}
tx_rx->tx_rx_type = FuriHalNfcTxRxTransparent;
tx_rx->tx_bits = 4;
furi_hal_nfc_tx_rx(tx_rx, 300);
break;
}
}
nfca_append_crc16(block_data, 16);