}
void iso14a_set_ATS_timeout(uint8_t *ats) {
-
uint8_t tb1;
uint8_t fwi;
uint32_t fwt;
// Generate the parity value for a byte sequence
//
//-----------------------------------------------------------------------------
-void GetParity(const uint8_t *pbtCmd, uint16_t iLen, uint8_t *par)
-{
+void GetParity(const uint8_t *pbtCmd, uint16_t iLen, uint8_t *par) {
uint16_t paritybit_cnt = 0;
uint16_t paritybyte_cnt = 0;
uint8_t parityBits = 0;
}
// save remaining parity bits
- par[paritybyte_cnt] = parityBits;
-
+ par[paritybyte_cnt] = parityBits;
}
-void AppendCrc14443a(uint8_t* data, int len)
-{
+void AppendCrc14443a(uint8_t* data, int len) {
ComputeCrc14443(CRC_14443_A,data,len,data+len,data+len+1);
}
#define IsMillerModulationNibble1(b) (Mod_Miller_LUT[(b & 0x000000F0) >> 4])
#define IsMillerModulationNibble2(b) (Mod_Miller_LUT[(b & 0x0000000F)])
-void UartReset()
-{
+void UartReset() {
Uart.state = STATE_UNSYNCD;
Uart.bitCount = 0;
Uart.len = 0; // number of decoded data bytes
Uart.syncBit = 9999;
}
-void UartInit(uint8_t *data, uint8_t *parity)
-{
+void UartInit(uint8_t *data, uint8_t *parity) {
Uart.output = data;
Uart.parity = parity;
Uart.fourBits = 0x00000000; // clear the buffer for 4 Bits
}
// use parameter non_real_time to provide a timestamp. Set to 0 if the decoder should measure real time
-static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time)
-{
-
+static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) {
Uart.fourBits = (Uart.fourBits << 8) | bit;
if (Uart.state == STATE_UNSYNCD) { // not yet synced
-
- Uart.syncBit = 9999; // not set
+ Uart.syncBit = 9999; // not set
// 00x11111 2|3 ticks pause followed by 6|5 ticks unmodulated Sequence Z (a "0" or "start of communication")
// 11111111 8 ticks unmodulation Sequence Y (a "0" or "end of communication" or "no information")
else if ((Uart.fourBits & (ISO14443A_STARTBIT_MASK >> 7)) == ISO14443A_STARTBIT_PATTERN >> 7) Uart.syncBit = 0;
if (Uart.syncBit != 9999) { // found a sync bit
- Uart.startTime = non_real_time?non_real_time:(GetCountSspClk() & 0xfffffff8);
- Uart.startTime -= Uart.syncBit;
- Uart.endTime = Uart.startTime;
- Uart.state = STATE_START_OF_COMMUNICATION;
- }
-
+ Uart.startTime = non_real_time ? non_real_time : (GetCountSspClk() & 0xfffffff8);
+ Uart.startTime -= Uart.syncBit;
+ Uart.endTime = Uart.startTime;
+ Uart.state = STATE_START_OF_COMMUNICATION;
+ }
} else {
if (IsMillerModulationNibble1(Uart.fourBits >> Uart.syncBit)) {
}
}
}
-
}
-
return FALSE; // not finished yet, need more data
}
#define IsManchesterModulationNibble1(b) (Mod_Manchester_LUT[(b & 0x00F0) >> 4])
#define IsManchesterModulationNibble2(b) (Mod_Manchester_LUT[(b & 0x000F)])
-
-void DemodReset()
-{
+void DemodReset() {
Demod.state = DEMOD_UNSYNCD;
Demod.len = 0; // number of decoded data bytes
Demod.parityLen = 0;
Demod.twoBits = 0xffff; // buffer for 2 Bits
Demod.highCnt = 0;
Demod.startTime = 0;
- Demod.endTime = 0;
-
- //
+ Demod.endTime = 0;
Demod.bitCount = 0;
Demod.syncBit = 0xFFFF;
Demod.samples = 0;
}
-void DemodInit(uint8_t *data, uint8_t *parity)
-{
+void DemodInit(uint8_t *data, uint8_t *parity) {
Demod.output = data;
Demod.parity = parity;
DemodReset();
}
// use parameter non_real_time to provide a timestamp. Set to 0 if the decoder should measure real time
-static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non_real_time)
-{
+static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non_real_time) {
Demod.twoBits = (Demod.twoBits << 8) | bit;
if (Demod.state == DEMOD_UNSYNCD) {
Demod.state = DEMOD_MANCHESTER_DATA;
}
}
-
} else {
if (IsManchesterModulationNibble1(Demod.twoBits >> Demod.syncBit)) { // modulation in first half
// Allocate memory from BigBuf for some buffers
// free all previous allocations first
BigBuf_free(); BigBuf_Clear_ext(false);
-
- // init trace buffer
clear_trace();
set_tracing(TRUE);
DemodReset();
// And reset the Miller decoder including itS (now outdated) input buffer
UartInit(receivedCmd, receivedCmdPar);
-
LED_C_OFF();
}
TagIsActive = (Demod.state != DEMOD_UNSYNCD);
Dbprintf("maxDataLen=%d, Uart.state=%x, Uart.len=%d", maxDataLen, Uart.state, Uart.len);
Dbprintf("traceLen=%d, Uart.output[0]=%08x", BigBuf_get_traceLen(), (uint32_t)Uart.output[0]);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
set_tracing(FALSE);
}
//-----------------------------------------------------------------------------
// Prepare tag messages
//-----------------------------------------------------------------------------
-static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *parity)
-{
+static void CodeIso14443aAsTagPar(const uint8_t *cmd, uint16_t len, uint8_t *parity) {
ToSendReset();
// Correction bit, might be removed when not needed
++ToSendMax;
}
-static void CodeIso14443aAsTag(const uint8_t *cmd, uint16_t len)
-{
+static void CodeIso14443aAsTag(const uint8_t *cmd, uint16_t len) {
uint8_t par[MAX_PARITY_SIZE] = {0};
GetParity(cmd, len, par);
CodeIso14443aAsTagPar(cmd, len, par);
}
-
-static void Code4bitAnswerAsTag(uint8_t cmd)
-{
+static void Code4bitAnswerAsTag(uint8_t cmd) {
int i;
+ uint8_t b = cmd;
ToSendReset();
// Send startbit
ToSend[++ToSendMax] = SEC_D;
- uint8_t b = cmd;
for(i = 0; i < 4; i++) {
if(b & 1) {
ToSend[++ToSendMax] = SEC_D;
// Stop when button is pressed
// Or return TRUE when command is captured
//-----------------------------------------------------------------------------
-static int GetIso14443aCommandFromReader(uint8_t *received, uint8_t *parity, int *len)
-{
+static int GetIso14443aCommandFromReader(uint8_t *received, uint8_t *parity, int *len) {
// Set FPGA mode to "simulated ISO 14443 tag", no modulation (listen
// only, since we are receiving, not transmitting).
// Signal field is off with the appropriate LED
// ----------- +
// 166 bytes, since every bit that needs to be send costs us a byte
//
-
-
- // Prepare the tag modulation bits from the message
- CodeIso14443aAsTag(response_info->response,response_info->response_n);
-
- // Make sure we do not exceed the free buffer space
- if (ToSendMax > max_buffer_size) {
- Dbprintf("Out of memory, when modulating bits for tag answer:");
- Dbhexdump(response_info->response_n,response_info->response,false);
- return false;
- }
-
- // Copy the byte array, used for this modulation to the buffer position
- memcpy(response_info->modulation,ToSend,ToSendMax);
-
- // Store the number of bytes that were used for encoding/modulation and the time needed to transfer them
- response_info->modulation_n = ToSendMax;
- response_info->ProxToAirDuration = LastProxToAirDuration;
-
- return true;
+ // Prepare the tag modulation bits from the message
+ CodeIso14443aAsTag(response_info->response,response_info->response_n);
+
+ // Make sure we do not exceed the free buffer space
+ if (ToSendMax > max_buffer_size) {
+ Dbprintf("Out of memory, when modulating bits for tag answer:");
+ Dbhexdump(response_info->response_n,response_info->response,false);
+ return FALSE;
+ }
+
+ // Copy the byte array, used for this modulation to the buffer position
+ memcpy(response_info->modulation,ToSend,ToSendMax);
+
+ // Store the number of bytes that were used for encoding/modulation and the time needed to transfer them
+ response_info->modulation_n = ToSendMax;
+ response_info->ProxToAirDuration = LastProxToAirDuration;
+ return TRUE;
}
// Main loop of simulated tag: receive commands from reader, decide what
// response to send, and send it.
//-----------------------------------------------------------------------------
-void SimulateIso14443aTag(int tagType, int flags, byte_t* data)
-{
+void SimulateIso14443aTag(int tagType, int flags, byte_t* data) {
uint32_t counters[] = {0,0,0};
//Here, we collect UID,NT,AR,NR,UID2,NT2,AR2,NR2
// This can be used in a reader-only attack.
// We already responded, do not send anything with the EmSendCmd14443aRaw() that is called below
p_response = NULL;
}
- } else if(receivedCmd[0] == 0x3A) { // Received a FAST READ (ranged read)
-
- uint8_t emdata[MAX_FRAME_SIZE];
- //first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature]
- int start = (receivedCmd[1]+12) * 4;
- int len = (receivedCmd[2] - receivedCmd[1] + 1) * 4;
- emlGetMemBt( emdata, start, len);
- AppendCrc14443a(emdata, len);
- EmSendCmdEx(emdata, len+2, false);
- p_response = NULL;
-
+ } else if(receivedCmd[0] == 0x3A) { // Received a FAST READ (ranged read)
+ uint8_t emdata[MAX_FRAME_SIZE];
+ //first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature]
+ int start = (receivedCmd[1]+12) * 4;
+ int len = (receivedCmd[2] - receivedCmd[1] + 1) * 4;
+ emlGetMemBt( emdata, start, len);
+ AppendCrc14443a(emdata, len);
+ EmSendCmdEx(emdata, len+2, false);
+ p_response = NULL;
} else if(receivedCmd[0] == 0x3C && tagType == 7) { // Received a READ SIGNATURE --
- //first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature]
- uint16_t start = 4 * 4;
- uint8_t emdata[34];
- emlGetMemBt( emdata, start, 32);
- AppendCrc14443a(emdata, 32);
- EmSendCmdEx(emdata, sizeof(emdata), false);
- p_response = NULL;
+ //first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature]
+ uint16_t start = 4 * 4;
+ uint8_t emdata[34];
+ emlGetMemBt( emdata, start, 32);
+ AppendCrc14443a(emdata, 32);
+ EmSendCmdEx(emdata, sizeof(emdata), false);
+ p_response = NULL;
} else if (receivedCmd[0] == 0x39 && tagType == 7) { // Received a READ COUNTER --
uint8_t index = receivedCmd[1];
uint8_t data[] = {0x00,0x00,0x00,0x14,0xa5};
// send ACK
uint8_t ack[] = {0x0a};
EmSendCmdEx(ack,sizeof(ack),false);
- p_response = NULL;
-
+ p_response = NULL;
} else if(receivedCmd[0] == 0x3E && tagType == 7) { // Received a CHECK_TEARING_EVENT --
//first 12 blocks of emu are [getversion answer - check tearing - pack - 0x00 - signature]
uint8_t emdata[3];
uint32_t nonce = bytes_to_num(response5,4);
uint32_t nr = bytes_to_num(receivedCmd,4);
uint32_t ar = bytes_to_num(receivedCmd+4,4);
- //Dbprintf("Auth attempt {nonce}{nr}{ar}: %08x %08x %08x", nonce, nr, ar);
- if(flags & FLAG_NR_AR_ATTACK )
- {
+ if(flags & FLAG_NR_AR_ATTACK ) {
if(ar_nr_collected < 2){
// Avoid duplicates... probably not necessary, nr should vary.
//if(ar_nr_responses[3] != nr){
memset(ar_nr_responses, 0x00, len);
}
}
- } else if (receivedCmd[0] == 0x1a ) // ULC authentication
- {
-
+ } else if (receivedCmd[0] == 0x1a ) { // ULC authentication
}
- else if (receivedCmd[0] == 0x1b) // NTAG / EV-1 authentication
- {
+ else if (receivedCmd[0] == 0x1b) { // NTAG / EV-1 authentication
if ( tagType == 7 ) {
uint16_t start = 13; //first 4 blocks of emu are [getversion answer - check tearing - pack - 0x00]
uint8_t emdata[4];
p_response = NULL;
uint32_t pwd = bytes_to_num(receivedCmd+1,4);
- if ( MF_DBGLEVEL >= 3) Dbprintf("Auth attempt: %08x", pwd);
+ if ( MF_DBGLEVEL >= 3) Dbprintf("Auth attempt: %08x", pwd);
}
} else {
// Check for ISO 14443A-4 compliant commands, look at left nibble
// Count number of other messages after a halt
if(order != 6 && lastorder == 5) { happened2++; }
+ // comment this limit if you want to simulation longer
if(cmdsRecvd > 999) {
DbpString("1000 commands later...");
break;
(LastTimeProxToAirStart + p_response->ProxToAirDuration)*16 + DELAY_ARM2AIR_AS_TAG,
par);
}
-
+
+ // comment this limit if you want to simulation longer
if (!tracing) {
Dbprintf("Trace Full. Simulation stopped.");
break;
return Demod.len;
}
-int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity)
-{
+int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity) {
if (!GetIso14443aAnswerFromTag(receivedAnswer, parity, 0)) return FALSE;
//if (tracing) {
- LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE);
+ LogTrace(receivedAnswer, Demod.len, Demod.startTime*16 - DELAY_AIR2ARM_AS_READER, Demod.endTime*16 - DELAY_AIR2ARM_AS_READER, parity, FALSE);
//}
return Demod.len;
}
FpgaSetupSsc();
// connect Demodulated Signal to ADC:
SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | fpga_minor_mode);
LED_D_OFF();
// Signal field is on with the appropriate LED
fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN)
LED_D_ON();
- FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | fpga_minor_mode);
-
+ // Prepare the demodulation functions
DemodReset();
UartReset();
iso14a_set_timeout(10*106); // 10ms default
+
+ //NextTransferTime = 2 * DELAY_ARM2AIR_AS_READER;
+ NextTransferTime = DELAY_ARM2AIR_AS_READER << 1;
// Start the timer
StartCountSspClk();
-
- NextTransferTime = 2*DELAY_ARM2AIR_AS_READER;
}
int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
// Read an ISO 14443a tag. Send out commands and store answers.
//
//-----------------------------------------------------------------------------
-void ReaderIso14443a(UsbCommand *c)
-{
+void ReaderIso14443a(UsbCommand *c) {
iso14a_command_t param = c->arg[0];
- uint8_t *cmd = c->d.asBytes;
size_t len = c->arg[1] & 0xffff;
size_t lenbits = c->arg[1] >> 16;
uint32_t timeout = c->arg[2];
+ uint8_t *cmd = c->d.asBytes;
uint32_t arg0 = 0;
byte_t buf[USB_CMD_DATA_SIZE] = {0x00};
uint8_t par[MAX_PARITY_SIZE] = {0x00};
if(!(param & ISO14A_NO_SELECT)) {
iso14a_card_select_t *card = (iso14a_card_select_t*)buf;
arg0 = iso14443a_select_card(NULL,card,NULL, true, 0);
- cmd_send(CMD_ACK,arg0,card->uidlen,0,buf,sizeof(iso14a_card_select_t));
+ cmd_send(CMD_ACK, arg0, card->uidlen, 0, buf, sizeof(iso14a_card_select_t));
// if it fails, the cmdhf14a.c client quites.. however this one still executes.
if ( arg0 == 0 ) return;
}
if (param & ISO14A_REQUEST_TRIGGER)
iso14a_set_trigger(FALSE);
-
if (param & ISO14A_NO_DISCONNECT)
return;
// Therefore try in alternating directions.
int32_t dist_nt(uint32_t nt1, uint32_t nt2) {
- uint16_t i;
- uint32_t nttmp1, nttmp2;
-
if (nt1 == nt2) return 0;
-
- nttmp1 = nt1;
- nttmp2 = nt2;
- for (i = 1; i < 32768; i++) {
+ uint16_t i;
+ uint32_t nttmp1 = nt1;
+ uint32_t nttmp2 = nt2;
+
+ for (i = 1; i < 32768; ++i) {
nttmp1 = prng_successor(nttmp1, 1);
if (nttmp1 == nt2) return i;
nttmp2 = prng_successor(nttmp2, 1);
if (nttmp2 == nt1) return -i;
- }
-
- return(-99999); // either nt1 or nt2 are invalid nonces
+ }
+ // either nt1 or nt2 are invalid nonces
+ return(-99999);
}
// Cloning MiFare Classic Rail and Building Passes, Anywhere, Anytime"
// (article by Nicolas T. Courtois, 2009)
//-----------------------------------------------------------------------------
-void ReaderMifare(bool first_try, uint8_t block )
-{
+void ReaderMifare(bool first_try, uint8_t block ) {
// Mifare AUTH
//uint8_t mf_auth[] = { 0x60,0x00,0xf5,0x7b };
//uint8_t mf_auth[] = { 0x60,0x05, 0x58, 0x2c };
- uint8_t mf_auth[] = { 0x60,0x00, 0x00, 0x00 };
+ uint8_t mf_auth[] = { MIFARE_AUTH_KEYA, block, 0x00, 0x00 };
uint8_t mf_nr_ar[] = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
uint8_t uid[10] = {0,0,0,0,0,0,0,0,0,0};
uint8_t par_list[8] = {0,0,0,0,0,0,0,0};
uint8_t receivedAnswer[MAX_MIFARE_FRAME_SIZE] = {0x00};
uint8_t receivedAnswerPar[MAX_MIFARE_PARITY_SIZE] = {0x00};
uint8_t par[1] = {0}; // maximum 8 Bytes to be sent here, 1 byte parity is therefore enough
-
- mf_auth[1] = block;
- AppendCrc14443a(mf_auth, 2);
-
byte_t nt_diff = 0;
-
uint32_t nt = 0;
uint32_t previous_nt = 0;
- uint32_t halt_time = 0;
uint32_t cuid = 0;
- int catch_up_cycles = 0;
- int last_catch_up = 0;
- int isOK = 0;
+ int32_t catch_up_cycles = 0;
+ int32_t last_catch_up = 0;
+ int32_t isOK = 0;
+ int32_t nt_distance = 0;
uint16_t elapsed_prng_sequences = 1;
uint16_t consecutive_resyncs = 0;
uint16_t unexpected_random = 0;
uint16_t sync_tries = 0;
- uint16_t strategy = 0;
+ // static variables here, is re-used in the next call?
static uint32_t nt_attacked = 0;
static uint32_t sync_time = 0;
- static int32_t sync_cycles = 0;
+ static uint32_t sync_cycles = 0;
static uint8_t par_low = 0;
static uint8_t mf_nr_ar3 = 0;
-
+
#define PRNG_SEQUENCE_LENGTH (1 << 16)
#define MAX_UNEXPECTED_RANDOM 4 // maximum number of unexpected (i.e. real) random numbers when trying to sync. Then give up.
#define MAX_SYNC_TRIES 32
#define MAX_STRATEGY 3
- // free eventually allocated BigBuf memory
- BigBuf_free(); BigBuf_Clear_ext(false);
-
+ BigBuf_free(); BigBuf_Clear_ext(false);
clear_trace();
- set_tracing(TRUE);
-
- LED_A_ON();
-
- if (first_try)
- iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
+ set_tracing(TRUE);
+ iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
+ AppendCrc14443a(mf_auth, 2);
+
if (first_try) {
sync_time = GetCountSspClk() & 0xfffffff8;
- sync_cycles = PRNG_SEQUENCE_LENGTH + 1100; //65536; //0x10000 // theory: Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces).
+ sync_cycles = PRNG_SEQUENCE_LENGTH + 1130; //65536; //0x10000 // Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces).
mf_nr_ar3 = 0;
nt_attacked = 0;
+ par_low = 0;
+ Dbprintf("FIRST: sync_time - %08X", sync_time);
} else {
// we were unsuccessful on a previous call.
// Try another READER nonce (first 3 parity bits remain the same)
mf_nr_ar[3] = mf_nr_ar3;
par[0] = par_low;
}
-
- LED_A_ON();
+
+ bool have_uid = FALSE;
+ uint8_t cascade_levels = 0;
+
LED_C_ON();
- for(uint16_t i = 0; TRUE; ++i) {
+ uint16_t i;
+ for(i = 0; TRUE; ++i) {
WDT_HIT();
break;
}
- if (strategy == 2) {
- // test with additional halt command
- halt_time = 0;
- int len = mifare_sendcmd_short(NULL, false, 0x50, 0x00, receivedAnswer, receivedAnswerPar, &halt_time);
-
- if (len && MF_DBGLEVEL >= 3)
- Dbprintf("Unexpected response of %d bytes to halt command.", len);
- }
-
- if (strategy == 3) {
- // test with FPGA power off/on
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- SpinDelay(200);
- iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
- SpinDelay(100);
- sync_time = GetCountSspClk() & 0xfffffff8;
- WDT_HIT();
- }
-
- if (!iso14443a_select_card(uid, NULL, &cuid, true, 0)) {
- if (MF_DBGLEVEL >= 2) Dbprintf("Mifare: Can't select card\n");
- continue;
+ // this part is from Piwi's faster nonce collecting part in Hardnested.
+ if (!have_uid) { // need a full select cycle to get the uid first
+ iso14a_card_select_t card_info;
+ if(!iso14443a_select_card(uid, &card_info, &cuid, true, 0)) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("Mifare: Can't select card (ALL)");
+ break;
+ }
+ switch (card_info.uidlen) {
+ case 4 : cascade_levels = 1; break;
+ case 7 : cascade_levels = 2; break;
+ case 10: cascade_levels = 3; break;
+ default: break;
+ }
+ have_uid = TRUE;
+ } else { // no need for anticollision. We can directly select the card
+ if(!iso14443a_select_card(uid, NULL, &cuid, false, cascade_levels)) {
+ if (MF_DBGLEVEL >= 4) Dbprintf("Mifare: Can't select card (UID)");
+ continue;
+ }
}
-
- // Sending timeslot of ISO14443a frame
- sync_time = (sync_time & 0xfffffff8) + sync_cycles + catch_up_cycles;
+ // Sending timeslot of ISO14443a frame
+ sync_time = (sync_time & 0xfffffff8 ) + sync_cycles + catch_up_cycles;
catch_up_cycles = 0;
-
- //catch_up_cycles = 0;
// if we missed the sync time already, advance to the next nonce repeat
- while(GetCountSspClk() > sync_time) {
+ while( GetCountSspClk() > sync_time) {
++elapsed_prng_sequences;
- sync_time = (sync_time & 0xfffffff8) + sync_cycles;
- }
- // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked)
- ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time);
+ sync_time = (sync_time & 0xfffffff8 ) + sync_cycles;
+ }
+
+ // Transmit MIFARE_CLASSIC_AUTH at synctime. Should result in returning the same tag nonce (== nt_attacked)
+ ReaderTransmit(mf_auth, sizeof(mf_auth), &sync_time);
- // Receive the (4 Byte) "random" nonce
+ // Receive the (4 Byte) "random" nonce from TAG
if (!ReaderReceive(receivedAnswer, receivedAnswerPar))
continue;
- // Transmit reader nonce with fake par
- ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL);
-
previous_nt = nt;
nt = bytes_to_num(receivedAnswer, 4);
+ // Transmit reader nonce with fake par
+ ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar), par, NULL);
+
+ WDT_HIT();
+ LED_B_ON();
if (first_try && previous_nt && !nt_attacked) { // we didn't calibrate our clock yet
- int nt_distance = dist_nt(previous_nt, nt);
+
+ nt_distance = dist_nt(previous_nt, nt);
+
+ // if no distance between, then we are in sync.
if (nt_distance == 0) {
nt_attacked = nt;
} else {
if (nt_distance == -99999) { // invalid nonce received
- unexpected_random++;
+ ++unexpected_random;
if (unexpected_random > MAX_UNEXPECTED_RANDOM) {
isOK = -3; // Card has an unpredictable PRNG. Give up
break;
- } else {
+ } else {
+ if (sync_cycles <= 0) sync_cycles += PRNG_SEQUENCE_LENGTH;
+ LED_B_OFF();
continue; // continue trying...
}
}
if (++sync_tries > MAX_SYNC_TRIES) {
- if (strategy > MAX_STRATEGY || MF_DBGLEVEL < 3) {
- isOK = -4; // Card's PRNG runs at an unexpected frequency or resets unexpectedly
- break;
- } else {
- continue;
- }
+ isOK = -4; // Card's PRNG runs at an unexpected frequency or resets unexpectedly
+ break;
}
sync_cycles = (sync_cycles - nt_distance)/elapsed_prng_sequences;
+
if (sync_cycles <= 0)
sync_cycles += PRNG_SEQUENCE_LENGTH;
- if (MF_DBGLEVEL >= 3)
+ if (MF_DBGLEVEL >= 4)
Dbprintf("calibrating in cycle %d. nt_distance=%d, elapsed_prng_sequences=%d, new sync_cycles: %d\n", i, nt_distance, elapsed_prng_sequences, sync_cycles);
+ LED_B_OFF();
continue;
}
}
+ LED_B_OFF();
if ((nt != nt_attacked) && nt_attacked) { // we somehow lost sync. Try to catch up again...
- catch_up_cycles = -dist_nt(nt_attacked, nt);
+ catch_up_cycles = ABS(dist_nt(nt_attacked, nt));
if (catch_up_cycles == 99999) { // invalid nonce received. Don't resync on that one.
catch_up_cycles = 0;
continue;
- }
-
+ }
// average?
catch_up_cycles /= elapsed_prng_sequences;
}
if (consecutive_resyncs < 3) {
- if (MF_DBGLEVEL >= 3)
- Dbprintf("Lost sync in cycle %d. nt_distance=%d. Consecutive Resyncs = %d. Trying one time catch up...\n", i, -catch_up_cycles, consecutive_resyncs);
+ if (MF_DBGLEVEL >= 4)
+ Dbprintf("Lost sync in cycle %d. nt_distance=%d. Consecutive Resyncs = %d. Trying one time catch up...\n", i, catch_up_cycles, consecutive_resyncs);
} else {
sync_cycles += catch_up_cycles;
- if (MF_DBGLEVEL >= 3)
- Dbprintf("Lost sync in cycle %d for the fourth time consecutively (nt_distance = %d). Adjusting sync_cycles to %d.\n", i, -catch_up_cycles, sync_cycles);
+ if (MF_DBGLEVEL >= 4)
+ Dbprintf("Lost sync in cycle %d for the fourth time consecutively (nt_distance = %d). Adjusting sync_cycles to %d.\n", i, catch_up_cycles, sync_cycles);
last_catch_up = 0;
catch_up_cycles = 0;
}
// Receive answer. This will be a 4 Bit NACK when the 8 parity bits are OK after decoding
- if (!ReaderReceive(receivedAnswer, receivedAnswerPar)) {
+ if (ReaderReceive(receivedAnswer, receivedAnswerPar)) {
catch_up_cycles = 8; // the PRNG is delayed by 8 cycles due to the NAC (4Bits = 0x05 encrypted) transfer
if (nt_diff == 0)
par_low = par[0] & 0xE0; // there is no need to check all parities for other nt_diff. Parity Bits for mf_nr_ar[0..2] won't change
par_list[nt_diff] = SwapBits(par[0], 8);
- ks_list[nt_diff] = receivedAnswer[0] ^ 0x05;
+ ks_list[nt_diff] = receivedAnswer[0] ^ 0x05; // xor with NACK value to get keystream
// Test if the information is complete
if (nt_diff == 0x07) {
}
}
+ // reset the resyncs since we got a complete transaction on right time.
consecutive_resyncs = 0;
- }
+ } // end for loop
mf_nr_ar[3] &= 0x1F;
- WDT_HIT();
-
- // reset sync_time.
- if ( isOK == 1) {
- sync_time = 0;
- sync_cycles = 0;
- mf_nr_ar3 = 0;
- nt_attacked = 0;
- par[0] = 0;
- }
+ if (MF_DBGLEVEL >= 1) Dbprintf("\nNumber of sent auth requestes: %u", i);
uint8_t buf[28] = {0x00};
+ memset(buf, 0x00, sizeof(buf));
num_to_bytes(cuid, 4, buf);
num_to_bytes(nt, 4, buf + 4);
memcpy(buf + 8, par_list, 8);
memcpy(buf + 16, ks_list, 8);
memcpy(buf + 24, mf_nr_ar, 4);
- cmd_send(CMD_ACK,isOK,0,0,buf,28);
+ cmd_send(CMD_ACK, isOK, 0, 0, buf, sizeof(buf) );
FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
LEDsoff();
* FLAG_NR_AR_ATTACK - means we should collect NR_AR responses for bruteforcing later
*@param exitAfterNReads, exit simulation after n blocks have been read, 0 is inifite
*/
-void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *datain)
-{
+void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *datain) {
int cardSTATE = MFEMUL_NOFIELD;
int _7BUID = 0;
int vHf = 0; // in mV
}
}
- FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
- LEDsoff();
-
// Interactive mode flag, means we need to send ACK
if(flags & FLAG_INTERACTIVE) {
//May just aswell send the collected ar_nr in the response aswell
}
if (MF_DBGLEVEL >= 1) Dbprintf("Emulator stopped. Tracing: %d trace length: %d ", tracing, BigBuf_get_traceLen());
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LEDsoff();
set_tracing(FALSE);
}
// free eventually allocated BigBuf memory
BigBuf_free(); BigBuf_Clear_ext(false);
-
- // init trace buffer
clear_trace();
set_tracing(TRUE);
// The command (reader -> tag) that we're receiving.
- // The length of a received command will in most cases be no more than 18 bytes.
- // So 32 should be enough!
uint8_t receivedCmd[MAX_MIFARE_FRAME_SIZE] = {0x00};
uint8_t receivedCmdPar[MAX_MIFARE_PARITY_SIZE] = {0x00};
// And now we loop, receiving samples.
for(uint32_t sniffCounter = 0; TRUE; ) {
+
+ LED_A_ON();
+ WDT_HIT();
if(BUTTON_PRESS()) {
DbpString("cancelled by button");
break;
}
-
- LED_A_ON();
- WDT_HIT();
-
+
if ((sniffCounter & 0x0000FFFF) == 0) { // from time to time
// check if a transaction is completed (timeout after 2000ms).
// if yes, stop the DMA transfer and send what we have so far to the client
if (!AT91C_BASE_PDC_SSC->PDC_RCR) {
AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t) dmaBuf;
AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE;
- Dbprintf("RxEmpty ERROR!!! data length:%d", dataLen); // temporary
+ Dbprintf("RxEmpty ERROR, data length:%d", dataLen); // temporary
}
// secondary buffer sets as primary, secondary buffer was stopped
if (!AT91C_BASE_PDC_SSC->PDC_RNCR) {
if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, TRUE)) break;
- /* And ready to receive another command. */
UartInit(receivedCmd, receivedCmdPar);
-
- /* And also reset the demod code */
DemodReset();
}
ReaderIsActive = (Uart.state != STATE_UNSYNCD);
if (MfSniffLogic(receivedResponse, Demod.len, Demod.parity, Demod.bitCount, FALSE)) break;
- // And ready to receive another response.
DemodReset();
-
- // And reset the Miller decoder including its (now outdated) input buffer
UartInit(receivedCmd, receivedCmdPar);
}
TagIsActive = (Demod.state != DEMOD_UNSYNCD);
FpgaDisableSscDma();
MfSniffEnd();
- LEDsoff();
Dbprintf("maxDataLen=%x, Uart.state=%x, Uart.len=%x", maxDataLen, Uart.state, Uart.len);
+ FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+ LEDsoff();
set_tracing(FALSE);
}
projects / proxmark3-svn / commitdiff