X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/f38cfd669304926cbad5ac54e2896458c7f80eb0..f9b5377fd07685592758eb54369a779bef7dae66:/armsrc/iso14443a.c

diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c
index 93bed2d5..61c018bb 100644
--- a/armsrc/iso14443a.c
+++ b/armsrc/iso14443a.c
@@ -1835,10 +1835,10 @@ int ReaderReceive(uint8_t *receivedAnswer, uint8_t *parity) {
 // if anticollision is false, then the UID must be provided in uid_ptr[] 
 // and num_cascades must be set (1: 4 Byte UID, 2: 7 Byte UID, 3: 10 Byte UID)
 int iso14443a_select_card(byte_t *uid_ptr, iso14a_card_select_t *p_hi14a_card, uint32_t *cuid_ptr, bool anticollision, uint8_t num_cascades) {
-	uint8_t wupa[]       = { 0x52 };  // 0x26 - REQA  0x52 - WAKE-UP
-	uint8_t sel_all[]    = { 0x93,0x20 };
-	uint8_t sel_uid[]    = { 0x93,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
-	uint8_t rats[]       = { 0xE0,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0
+	uint8_t wupa[]       = { ISO14443A_CMD_WUPA };  // 0x26 - ISO14443A_CMD_REQA  0x52 - ISO14443A_CMD_WUPA
+	uint8_t sel_all[]    = { ISO14443A_CMD_ANTICOLL_OR_SELECT,0x20 };
+	uint8_t sel_uid[]    = { ISO14443A_CMD_ANTICOLL_OR_SELECT,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
+	uint8_t rats[]       = { ISO14443A_CMD_RATS,0x80,0x00,0x00 }; // FSD=256, FSDI=8, CID=0
 	uint8_t resp[MAX_FRAME_SIZE] = {0}; // theoretically. A usual RATS will be much smaller
 	uint8_t resp_par[MAX_PARITY_SIZE] = {0};
 	byte_t uid_resp[4] = {0};
@@ -1987,31 +1987,31 @@ int iso14443a_select_card(byte_t *uid_ptr, iso14a_card_select_t *p_hi14a_card, u
 }
 
 void iso14443a_setup(uint8_t fpga_minor_mode) {
+
 	FpgaDownloadAndGo(FPGA_BITSTREAM_HF);
 	// Set up the synchronous serial port
 	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
 	if (fpga_minor_mode == FPGA_HF_ISO14443A_READER_MOD ||
 		fpga_minor_mode == FPGA_HF_ISO14443A_READER_LISTEN)
 		LED_D_ON();
 
-	// Prepare the demodulation functions
-	DemodReset();
-	UartReset();
-
-	iso14a_set_timeout(10*106); // 10ms default
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | fpga_minor_mode);
 
-	//NextTransferTime = 2 * DELAY_ARM2AIR_AS_READER;
-	NextTransferTime = DELAY_ARM2AIR_AS_READER << 1;
+	SpinDelay(20);
 	
 	// Start the timer
 	StartCountSspClk();
+	
+	// Prepare the demodulation functions
+	DemodReset();
+	UartReset();
+	NextTransferTime = 2 * DELAY_ARM2AIR_AS_READER;
+	iso14a_set_timeout(10*106); // 20ms default	
 }
 
 int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
@@ -2044,9 +2044,9 @@ int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, void *data) {
 	return len;
 }
 
+
 //-----------------------------------------------------------------------------
 // Read an ISO 14443a tag. Send out commands and store answers.
-//
 //-----------------------------------------------------------------------------
 void ReaderIso14443a(UsbCommand *c) {
 	iso14a_command_t param = c->arg[0];
@@ -2145,10 +2145,31 @@ int32_t dist_nt(uint32_t nt1, uint32_t nt2) {
 	uint32_t nttmp1 = nt1;
 	uint32_t nttmp2 = nt2;
 
-	for (uint16_t i = 1; i < 0xFFFF; ++i) {
+	for (uint16_t i = 1; i < 32768/8; ++i) {
 		nttmp1 = prng_successor(nttmp1, 1);	if (nttmp1 == nt2) return i;
 		nttmp2 = prng_successor(nttmp2, 1);	if (nttmp2 == nt1) return -i;
-	}	
+		
+		nttmp1 = prng_successor(nttmp1, 1);	if (nttmp1 == nt2) return i+1;
+		nttmp2 = prng_successor(nttmp2, 1);	if (nttmp2 == nt1) return -(i+1);
+		
+		nttmp1 = prng_successor(nttmp1, 1);	if (nttmp1 == nt2) return i+2;
+		nttmp2 = prng_successor(nttmp2, 1);	if (nttmp2 == nt1) return -(i+2);
+
+		nttmp1 = prng_successor(nttmp1, 1);	if (nttmp1 == nt2) return i+3;
+		nttmp2 = prng_successor(nttmp2, 1);	if (nttmp2 == nt1) return -(i+3);
+		
+		nttmp1 = prng_successor(nttmp1, 1);	if (nttmp1 == nt2) return i+4;
+		nttmp2 = prng_successor(nttmp2, 1);	if (nttmp2 == nt1) return -(i+4);
+		
+		nttmp1 = prng_successor(nttmp1, 1);	if (nttmp1 == nt2) return i+5;
+		nttmp2 = prng_successor(nttmp2, 1);	if (nttmp2 == nt1) return -(i+5);
+		
+		nttmp1 = prng_successor(nttmp1, 1);	if (nttmp1 == nt2) return i+6;
+		nttmp2 = prng_successor(nttmp2, 1);	if (nttmp2 == nt1) return -(i+6);
+		
+		nttmp1 = prng_successor(nttmp1, 1);	if (nttmp1 == nt2) return i+7;
+		nttmp2 = prng_successor(nttmp2, 1);	if (nttmp2 == nt1) return -(i+7);		
+	}
 	// either nt1 or nt2 are invalid nonces	
 	return(-99999); 
 }
@@ -2204,8 +2225,7 @@ void ReaderMifare(bool first_try, uint8_t block, uint8_t keytype ) {
 	iso14443a_setup(FPGA_HF_ISO14443A_READER_MOD);
 
 	sync_time = GetCountSspClk() & 0xfffffff8;
-	// iceman,  i add 1130 because during my observations this makse the syncronization much fast to sync.
-	sync_cycles = PRNG_SEQUENCE_LENGTH + 1130; //65536;	// Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces).		
+	sync_cycles = PRNG_SEQUENCE_LENGTH; // Mifare Classic's random generator repeats every 2^16 cycles (and so do the nonces).		
 	nt_attacked = 0;
 	
    if (MF_DBGLEVEL >= 4)	Dbprintf("Mifare::Sync %08x", sync_time);
@@ -2282,7 +2302,7 @@ void ReaderMifare(bool first_try, uint8_t block, uint8_t keytype ) {
 	
 		// we didn't calibrate our clock yet,
 		// iceman: has to be calibrated every time.
-		if (first_try &&  previous_nt && !nt_attacked) { 
+		if (previous_nt && !nt_attacked) { 
 
 			nt_distance = dist_nt(previous_nt, nt);
 			
@@ -2321,7 +2341,7 @@ void ReaderMifare(bool first_try, uint8_t block, uint8_t keytype ) {
 		}
 		LED_B_OFF();
 
-		if ((nt != nt_attacked) && nt_attacked) { 	// we somehow lost sync. Try to catch up again...
+		if ( (nt != nt_attacked) && nt_attacked) { 	// we somehow lost sync. Try to catch up again...
 			
 			catch_up_cycles = ABS(dist_nt(nt_attacked, nt));
 			if (catch_up_cycles == 99999) {			// invalid nonce received. Don't resync on that one.