flipperzero-firmware/applications/external/picopass/rfal_picopass.c

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#include "rfal_picopass.h"
#define RFAL_PICOPASS_TXRX_FLAGS \
(FURI_HAL_NFC_LL_TXRX_FLAGS_CRC_TX_MANUAL | FURI_HAL_NFC_LL_TXRX_FLAGS_AGC_ON | \
FURI_HAL_NFC_LL_TXRX_FLAGS_PAR_RX_REMV | FURI_HAL_NFC_LL_TXRX_FLAGS_CRC_RX_KEEP)
#define TAG "RFAL_PICOPASS"
typedef struct {
uint8_t CMD;
uint8_t CSN[RFAL_PICOPASS_UID_LEN];
} rfalPicoPassSelectReq;
typedef struct {
uint8_t CMD;
uint8_t null[4];
uint8_t mac[4];
} rfalPicoPassCheckReq;
static uint16_t rfalPicoPassUpdateCcitt(uint16_t crcSeed, uint8_t dataByte) {
uint16_t crc = crcSeed;
uint8_t dat = dataByte;
dat ^= (uint8_t)(crc & 0xFFU);
dat ^= (dat << 4);
crc = (crc >> 8) ^ (((uint16_t)dat) << 8) ^ (((uint16_t)dat) << 3) ^ (((uint16_t)dat) >> 4);
return crc;
}
static uint16_t
rfalPicoPassCalculateCcitt(uint16_t preloadValue, const uint8_t* buf, uint16_t length) {
uint16_t crc = preloadValue;
uint16_t index;
for(index = 0; index < length; index++) {
crc = rfalPicoPassUpdateCcitt(crc, buf[index]);
}
return crc;
}
FuriHalNfcReturn rfalPicoPassPollerInitialize(void) {
FuriHalNfcReturn ret;
ret = furi_hal_nfc_ll_set_mode(
FuriHalNfcModePollPicopass, FuriHalNfcBitrate26p48, FuriHalNfcBitrate26p48);
if(ret != FuriHalNfcReturnOk) {
return ret;
};
furi_hal_nfc_ll_set_error_handling(FuriHalNfcErrorHandlingNfc);
furi_hal_nfc_ll_set_guard_time(FURI_HAL_NFC_LL_GT_PICOPASS);
furi_hal_nfc_ll_set_fdt_listen(FURI_HAL_NFC_LL_FDT_LISTEN_PICOPASS_POLLER);
furi_hal_nfc_ll_set_fdt_poll(FURI_HAL_NFC_LL_FDT_POLL_PICOPASS_POLLER);
return FuriHalNfcReturnOk;
}
FuriHalNfcReturn rfalPicoPassPollerCheckPresence(void) {
FuriHalNfcReturn ret;
uint8_t txBuf[1] = {RFAL_PICOPASS_CMD_ACTALL};
uint8_t rxBuf[32] = {0};
uint16_t recvLen = 0;
uint32_t flags = RFAL_PICOPASS_TXRX_FLAGS;
uint32_t fwt = furi_hal_nfc_ll_ms2fc(20);
ret = furi_hal_nfc_ll_txrx(txBuf, 1, rxBuf, 32, &recvLen, flags, fwt);
return ret;
}
FuriHalNfcReturn rfalPicoPassPollerIdentify(rfalPicoPassIdentifyRes* idRes) {
FuriHalNfcReturn ret;
uint8_t txBuf[1] = {RFAL_PICOPASS_CMD_IDENTIFY};
uint16_t recvLen = 0;
uint32_t flags = RFAL_PICOPASS_TXRX_FLAGS;
uint32_t fwt = furi_hal_nfc_ll_ms2fc(20);
ret = furi_hal_nfc_ll_txrx(
txBuf,
sizeof(txBuf),
(uint8_t*)idRes,
sizeof(rfalPicoPassIdentifyRes),
&recvLen,
flags,
fwt);
// printf("identify rx: %d %s\n", recvLen, hex2Str(idRes->CSN, RFAL_PICOPASS_UID_LEN));
return ret;
}
FuriHalNfcReturn rfalPicoPassPollerSelect(uint8_t* csn, rfalPicoPassSelectRes* selRes) {
FuriHalNfcReturn ret;
rfalPicoPassSelectReq selReq;
selReq.CMD = RFAL_PICOPASS_CMD_SELECT;
memcpy(selReq.CSN, csn, RFAL_PICOPASS_UID_LEN);
uint16_t recvLen = 0;
uint32_t flags = RFAL_PICOPASS_TXRX_FLAGS;
uint32_t fwt = furi_hal_nfc_ll_ms2fc(20);
ret = furi_hal_nfc_ll_txrx(
(uint8_t*)&selReq,
sizeof(rfalPicoPassSelectReq),
(uint8_t*)selRes,
sizeof(rfalPicoPassSelectRes),
&recvLen,
flags,
fwt);
// printf("select rx: %d %s\n", recvLen, hex2Str(selRes->CSN, RFAL_PICOPASS_UID_LEN));
if(ret == FuriHalNfcReturnTimeout) {
return FuriHalNfcReturnOk;
}
return ret;
}
FuriHalNfcReturn rfalPicoPassPollerReadCheck(rfalPicoPassReadCheckRes* rcRes) {
FuriHalNfcReturn ret;
uint8_t txBuf[2] = {RFAL_PICOPASS_CMD_READCHECK, 0x02};
uint16_t recvLen = 0;
uint32_t flags = RFAL_PICOPASS_TXRX_FLAGS;
uint32_t fwt = furi_hal_nfc_ll_ms2fc(20);
ret = furi_hal_nfc_ll_txrx(
txBuf,
sizeof(txBuf),
(uint8_t*)rcRes,
sizeof(rfalPicoPassReadCheckRes),
&recvLen,
flags,
fwt);
// printf("readcheck rx: %d %s\n", recvLen, hex2Str(rcRes->CCNR, 8));
if(ret == FuriHalNfcReturnCrc) {
return FuriHalNfcReturnOk;
}
return ret;
}
FuriHalNfcReturn rfalPicoPassPollerCheck(uint8_t* mac, rfalPicoPassCheckRes* chkRes) {
FuriHalNfcReturn ret;
rfalPicoPassCheckReq chkReq;
chkReq.CMD = RFAL_PICOPASS_CMD_CHECK;
memcpy(chkReq.mac, mac, 4);
memset(chkReq.null, 0, 4);
uint16_t recvLen = 0;
uint32_t flags = RFAL_PICOPASS_TXRX_FLAGS;
uint32_t fwt = furi_hal_nfc_ll_ms2fc(20);
// printf("check tx: %s\n", hex2Str((uint8_t *)&chkReq, sizeof(rfalPicoPassCheckReq)));
ret = furi_hal_nfc_ll_txrx(
(uint8_t*)&chkReq,
sizeof(rfalPicoPassCheckReq),
(uint8_t*)chkRes,
sizeof(rfalPicoPassCheckRes),
&recvLen,
flags,
fwt);
// printf("check rx: %d %s\n", recvLen, hex2Str(chkRes->mac, 4));
if(ret == FuriHalNfcReturnCrc) {
return FuriHalNfcReturnOk;
}
return ret;
}
FuriHalNfcReturn rfalPicoPassPollerReadBlock(uint8_t blockNum, rfalPicoPassReadBlockRes* readRes) {
FuriHalNfcReturn ret;
uint8_t txBuf[4] = {RFAL_PICOPASS_CMD_READ, 0, 0, 0};
txBuf[1] = blockNum;
uint16_t crc = rfalPicoPassCalculateCcitt(0xE012, txBuf + 1, 1);
memcpy(txBuf + 2, &crc, sizeof(uint16_t));
uint16_t recvLen = 0;
uint32_t flags = RFAL_PICOPASS_TXRX_FLAGS;
uint32_t fwt = furi_hal_nfc_ll_ms2fc(20);
ret = furi_hal_nfc_ll_txrx(
txBuf,
sizeof(txBuf),
(uint8_t*)readRes,
sizeof(rfalPicoPassReadBlockRes),
&recvLen,
flags,
fwt);
return ret;
}
FuriHalNfcReturn rfalPicoPassPollerWriteBlock(uint8_t blockNum, uint8_t data[8], uint8_t mac[4]) {
FuriHalNfcReturn ret;
uint8_t txBuf[14] = {RFAL_PICOPASS_CMD_WRITE, blockNum, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
memcpy(txBuf + 2, data, RFAL_PICOPASS_MAX_BLOCK_LEN);
memcpy(txBuf + 10, mac, 4);
uint16_t recvLen = 0;
uint32_t flags = RFAL_PICOPASS_TXRX_FLAGS;
uint32_t fwt = furi_hal_nfc_ll_ms2fc(20);
rfalPicoPassReadBlockRes block;
ret = furi_hal_nfc_ll_txrx(
txBuf, sizeof(txBuf), (uint8_t*)&block, sizeof(block), &recvLen, flags, fwt);
if(ret == FuriHalNfcReturnOk) {
// TODO: compare response
}
return ret;
}