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fix 'hf iclass sim'

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* fix tag response timing. iClass differs from ISO15693 in this respect.
* speedup CodeIso15693AsTag()
* TransmitTo15693Tag(): don't send unmodulated start of SOF
* reduce modulation depth in hi_simulate.v
* calculate CRC for configuration block when simulating
* Show real response time instead of planned response time in 'hf list iclass'
This commit is contained in:
pwpiwi 2019-10-05 17:57:16 +02:00
parent ae60ceca92
commit 8efd0b80f2
5 changed files with 59 additions and 43 deletions
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23
armsrc/iclass.c
View file

@ -59,6 +59,13 @@
static int timeout = 4096;
// iCLASS has a slightly different timing compared to ISO15693. According to the picopass data sheet the tag response is expected 330us after
// the reader command. This is measured from end of reader EOF to first modulation of the tag's SOF which starts with a 56,64us unmodulated period.
// 330us = 140 ssp_clk cycles @ 423,75kHz when simulating.
// 56,64us = 24 ssp_clk_cycles
#define DELAY_ICLASS_VCD_TO_VICC_SIM 140
#define TAG_SOF_UNMODULATED 24
//-----------------------------------------------------------------------------
// The software UART that receives commands from the reader, and its state
// variables.
@ -800,13 +807,12 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
AppendCrc(anticoll_data, 8);
AppendCrc(csn_data, 8);
uint8_t diversified_key_d[8];
uint8_t diversified_key_c[8];
uint8_t diversified_key_d[8] = { 0x00 };
uint8_t diversified_key_c[8] = { 0x00 };
uint8_t *diversified_key = diversified_key_d;
// configuration block
uint8_t conf_block[10] = {0x12, 0xFF, 0xFF, 0xFF, 0x7F, 0x1F, 0xFF, 0x3C, 0x00, 0x00};
AppendCrc(conf_block, 8);
// e-Purse
uint8_t card_challenge_data[8] = { 0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
@ -819,6 +825,8 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
memcpy(diversified_key_c, emulator + 8 * 4, 8); // Kc
}
AppendCrc(conf_block, 8);
// save card challenge for sim2,4 attack
if (reader_mac_buf != NULL) {
memcpy(reader_mac_buf, card_challenge_data, 8);
@ -1185,7 +1193,7 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
} else if (receivedCmd[0] == ICLASS_CMD_PAGESEL && len == 4) {
// Pagesel
// Chips with a single page will not answer to this command
// Otherwise, we should answer 8bytes (block) + 2bytes CRC
// Otherwise, we should answer 8bytes (conf block 1) + 2bytes CRC
if (chip_state == SELECTED) {
if (simulationMode == ICLASS_SIM_MODE_FULL && max_page > 0) {
current_page = receivedCmd[1];
@ -1219,11 +1227,11 @@ int doIClassSimulation(int simulationMode, uint8_t *reader_mac_buf) {
}
/**
A legit tag has about 311,5us delay between reader EOT and tag SOF.
A legit tag has about 273,4us delay between reader EOT and tag SOF.
**/
if (modulated_response_size > 0) {
uint32_t response_time = reader_eof_time + DELAY_ISO15693_VCD_TO_VICC_SIM - DELAY_ARM_TO_READER_SIM;
TransmitTo15693Reader(modulated_response, modulated_response_size, response_time, false);
uint32_t response_time = reader_eof_time + DELAY_ICLASS_VCD_TO_VICC_SIM - TAG_SOF_UNMODULATED - DELAY_ARM_TO_READER_SIM;
TransmitTo15693Reader(modulated_response, modulated_response_size, &response_time, 0, false);
LogTrace(trace_data, trace_data_size, response_time + DELAY_ARM_TO_READER_SIM, response_time + (modulated_response_size << 6) + DELAY_ARM_TO_READER_SIM, NULL, false);
}
@ -1559,6 +1567,7 @@ static uint8_t handshakeIclassTag_ext(uint8_t *card_data, bool use_credit_key) {
ReaderTransmitIClass(act_all, 1);
// Card present?
if (!ReaderReceiveIClass(resp)) return read_status;//Fail
//Send Identify
ReaderTransmitIClass(identify, 1);
//We expect a 10-byte response here, 8 byte anticollision-CSN and 2 byte CRC

41
armsrc/iso15693.c
View file

@ -246,6 +246,8 @@ static void CodeIso15693AsReader256(uint8_t *cmd, int n)
// }
// }
static const uint8_t encode_4bits[16] = { 0xaa, 0x6a, 0x9a, 0x5a, 0xa6, 0x66, 0x96, 0x56, 0xa9, 0x69, 0x99, 0x59, 0xa5, 0x65, 0x95, 0x55 };
void CodeIso15693AsTag(uint8_t *cmd, size_t len) {
/*
* SOF comprises 3 parts;
@ -280,16 +282,9 @@ void CodeIso15693AsTag(uint8_t *cmd, size_t len) {
ToSend[++ToSendMax] = 0x1D; // 00011101
// data
for(int i = 0; i < len; i++) {
for(int j = 0; j < 8; j++) {
if ((cmd[i] >> j) & 0x01) {
ToSendStuffBit(0);
ToSendStuffBit(1);
} else {
ToSendStuffBit(1);
ToSendStuffBit(0);
}
}
for (int i = 0; i < len; i++) {
ToSend[++ToSendMax] = encode_4bits[cmd[i] & 0xF];
ToSend[++ToSendMax] = encode_4bits[cmd[i] >> 4];
}
// EOF
@ -327,19 +322,32 @@ static void TransmitTo15693Tag(const uint8_t *cmd, int len, uint32_t start_time)
//-----------------------------------------------------------------------------
// Transmit the tag response (to the reader) that was placed in cmd[].
//-----------------------------------------------------------------------------
void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, bool slow) {
void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t *start_time, uint32_t slot_time, bool slow) {
// don't use the FPGA_HF_SIMULATOR_MODULATE_424K_8BIT minor mode. It would spoil GetCountSspClk()
FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_SIMULATOR | FPGA_HF_SIMULATOR_MODULATE_424K);
uint8_t shift_delay = start_time & 0x00000007;
uint32_t modulation_start_time = *start_time + 3 * 8; // no need to transfer the unmodulated start of SOF
while (GetCountSspClk() < (start_time & 0xfffffff8)) ;
while (GetCountSspClk() > (modulation_start_time & 0xfffffff8) + 3) { // we will miss the intended time
if (slot_time) {
modulation_start_time += slot_time; // use next available slot
} else {
modulation_start_time = (modulation_start_time & 0xfffffff8) + 8; // next possible time
}
}
while (GetCountSspClk() < (modulation_start_time & 0xfffffff8))
/* wait */ ;
uint8_t shift_delay = modulation_start_time & 0x00000007;
*start_time = modulation_start_time - 3 * 8;
LED_C_ON();
uint8_t bits_to_shift = 0x00;
uint8_t bits_to_send = 0x00;
for(size_t c = 0; c < len; c++) {
for (int i = 7; i >= 0; i--) {
for (size_t c = 0; c < len; c++) {
for (int i = (c==0?4:7); i >= 0; i--) {
uint8_t cmd_bits = ((cmd[c] >> i) & 0x01) ? 0xff : 0x00;
for (int j = 0; j < (slow?4:1); ) {
if (AT91C_BASE_SSC->SSC_SR & AT91C_SSC_TXRDY) {
@ -361,7 +369,6 @@ void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time,
}
}
LED_C_OFF();
}
@ -1529,7 +1536,7 @@ void SimTagIso15693(uint32_t parameter, uint8_t *uid)
if ((cmd_len >= 5) && (cmd[0] & ISO15693_REQ_INVENTORY) && (cmd[1] == ISO15693_INVENTORY)) { // TODO: check more flags
bool slow = !(cmd[0] & ISO15693_REQ_DATARATE_HIGH);
start_time = eof_time + DELAY_ISO15693_VCD_TO_VICC_SIM - DELAY_ARM_TO_READER_SIM;
TransmitTo15693Reader(ToSend, ToSendMax, start_time, slow);
TransmitTo15693Reader(ToSend, ToSendMax, &start_time, 0, slow);
}
Dbprintf("%d bytes read from reader:", cmd_len);

2
armsrc/iso15693.h
View file

@ -26,7 +26,7 @@
void CodeIso15693AsTag(uint8_t *cmd, size_t len);
int GetIso15693CommandFromReader(uint8_t *received, size_t max_len, uint32_t *eof_time);
void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t start_time, bool slow);
void TransmitTo15693Reader(const uint8_t *cmd, size_t len, uint32_t *start_time, uint32_t slot_time, bool slow);
void SnoopIso15693(void);
void AcquireRawAdcSamplesIso15693(void);
void ReaderIso15693(uint32_t parameter);

BIN
fpga/fpga_hf.bit
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Binary file not shown.

2
fpga/hi_simulate.v
View file

@ -132,7 +132,7 @@ always @(*)
// modulation than a real tag would.
assign pwr_hi = 1'b0; // HF antenna connected to GND
assign pwr_oe3 = 1'b0; // 10k Load
assign pwr_oe1 = modulating_carrier; // 33 Ohms Load
assign pwr_oe1 = 1'b0; // 33 Ohms Load
assign pwr_oe4 = modulating_carrier; // 33 Ohms Load
// This is all LF and doesn't matter