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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
2 changed files with 20 additions and 5 deletions
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18
lib/nfc/protocols/mifare_classic.c
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@@ -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);