X-Git-Url: http://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/593924e751322492335634fca20e70d112becbac..ab8b654efa9524b494014efd35ac426aaa42884b:/armsrc/iso14443a.c

diff --git a/armsrc/iso14443a.c b/armsrc/iso14443a.c
index 8c3293a6..74e269da 100644
--- a/armsrc/iso14443a.c
+++ b/armsrc/iso14443a.c
@@ -1,4 +1,5 @@
 //-----------------------------------------------------------------------------
+// Merlok - June 2011
 // Gerhard de Koning Gans - May 2008
 // Hagen Fritsch - June 2010
 //
@@ -16,6 +17,8 @@
 
 #include "iso14443crc.h"
 #include "iso14443a.h"
+#include "crapto1.h"
+#include "mifareutil.h"
 
 static uint8_t *trace = (uint8_t *) BigBuf;
 static int traceLen = 0;
@@ -23,11 +26,11 @@ static int rsamples = 0;
 static int tracing = TRUE;
 static uint32_t iso14a_timeout;
 
-// CARD TO READER
+// CARD TO READER - manchester
 // Sequence D: 11110000 modulation with subcarrier during first half
 // Sequence E: 00001111 modulation with subcarrier during second half
 // Sequence F: 00000000 no modulation with subcarrier
-// READER TO CARD
+// READER TO CARD - miller
 // Sequence X: 00001100 drop after half a period
 // Sequence Y: 00000000 no drop
 // Sequence Z: 11000000 drop at start
@@ -57,22 +60,27 @@ static const uint8_t OddByteParity[256] = {
   1, 0, 0, 1, 0, 1, 1, 0, 0, 1, 1, 0, 1, 0, 0, 1
 };
 
-// BIG CHANGE - UNDERSTAND THIS BEFORE WE COMMIT
-#define RECV_CMD_OFFSET   3032
-#define RECV_RES_OFFSET   3096
-#define DMA_BUFFER_OFFSET 3160
-#define DMA_BUFFER_SIZE   4096
-#define TRACE_LENGTH      3000
-
 uint8_t trigger = 0;
 void iso14a_set_trigger(int enable) {
 	trigger = enable;
 }
 
+void iso14a_clear_tracelen(void) {
+	traceLen = 0;
+}
+void iso14a_set_tracing(int enable) {
+	tracing = enable;
+}
+
 //-----------------------------------------------------------------------------
 // Generate the parity value for a byte sequence
 //
 //-----------------------------------------------------------------------------
+byte_t oddparity (const byte_t bt)
+{
+  return OddByteParity[bt];
+}
+
 uint32_t GetParity(const uint8_t * pbtCmd, int iLen)
 {
   int i;
@@ -644,7 +652,7 @@ void RAMFUNC SnoopIso14443a(void)
     // Count of samples received so far, so that we can include timing
     // information in the trace buffer.
     int samples = 0;
-	int rsamples = 0;
+    int rsamples = 0;
 
     memset(trace, 0x44, RECV_CMD_OFFSET);
 
@@ -776,12 +784,12 @@ done:
 //-----------------------------------------------------------------------------
 // Prepare tag messages
 //-----------------------------------------------------------------------------
-static void CodeIso14443aAsTag(const uint8_t *cmd, int len)
+static void CodeIso14443aAsTagPar(const uint8_t *cmd, int len, uint32_t dwParity)
 {
-    int i;
-	int oddparity;
+	int i;
+//	int oddparity;
 
-    ToSendReset();
+	ToSendReset();
 
 	// Correction bit, might be removed when not needed
 	ToSendStuffBit(0);
@@ -792,55 +800,68 @@ static void CodeIso14443aAsTag(const uint8_t *cmd, int len)
 	ToSendStuffBit(0);
 	ToSendStuffBit(0);
 	ToSendStuffBit(0);
-
+	
 	// Send startbit
 	ToSend[++ToSendMax] = SEC_D;
 
-    for(i = 0; i < len; i++) {
-        int j;
-        uint8_t b = cmd[i];
+	for(i = 0; i < len; i++) {
+		int j;
+		uint8_t b = cmd[i];
 
 		// Data bits
-        oddparity = 0x01;
+//		oddparity = 0x01;
 		for(j = 0; j < 8; j++) {
-            oddparity ^= (b & 1);
+//			oddparity ^= (b & 1);
 			if(b & 1) {
 				ToSend[++ToSendMax] = SEC_D;
 			} else {
 				ToSend[++ToSendMax] = SEC_E;
-            }
-            b >>= 1;
-        }
+			}
+			b >>= 1;
+		}
 
-        // Parity bit
-        if(oddparity) {
-        	ToSend[++ToSendMax] = SEC_D;
+	// Get the parity bit
+		if ((dwParity >> i) & 0x01) {
+			ToSend[++ToSendMax] = SEC_D;
 		} else {
 			ToSend[++ToSendMax] = SEC_E;
 		}
-    }
+		
+			// Parity bit
+//			if(oddparity) {
+//				ToSend[++ToSendMax] = SEC_D;
+//			} else {
+//				ToSend[++ToSendMax] = SEC_E;
+//			}
+
+//		if (oddparity != ((dwParity >> i) & 0x01))
+//		  Dbprintf("par error. i=%d", i);
+	}
 
-    // Send stopbit
-    ToSend[++ToSendMax] = SEC_F;
+	// Send stopbit
+	ToSend[++ToSendMax] = SEC_F;
 
 	// Flush the buffer in FPGA!!
 	for(i = 0; i < 5; i++) {
-		ToSend[++ToSendMax] = SEC_F;
+//		ToSend[++ToSendMax] = SEC_F;
 	}
 
-    // Convert from last byte pos to length
-    ToSendMax++;
+	// Convert from last byte pos to length
+	ToSendMax++;
 
     // Add a few more for slop
-    ToSend[ToSendMax++] = 0x00;
-	ToSend[ToSendMax++] = 0x00;
-    //ToSendMax += 2;
+//    ToSend[ToSendMax++] = 0x00;
+//	ToSend[ToSendMax++] = 0x00;
+}
+
+static void CodeIso14443aAsTag(const uint8_t *cmd, int len){
+	CodeIso14443aAsTagPar(cmd, len, GetParity(cmd, len));
 }
 
 //-----------------------------------------------------------------------------
 // This is to send a NACK kind of answer, its only 3 bits, I know it should be 4
 //-----------------------------------------------------------------------------
-static void CodeStrangeAnswer()
+static void CodeStrangeAnswerAsTag()
 {
 	int i;
 
@@ -878,11 +899,47 @@ static void CodeStrangeAnswer()
 
     // Convert from last byte pos to length
     ToSendMax++;
+}
 
-    // Add a few more for slop
-    ToSend[ToSendMax++] = 0x00;
-	ToSend[ToSendMax++] = 0x00;
-    //ToSendMax += 2;
+static void Code4bitAnswerAsTag(uint8_t cmd)
+{
+	int i;
+
+    ToSendReset();
+
+	// Correction bit, might be removed when not needed
+	ToSendStuffBit(0);
+	ToSendStuffBit(0);
+	ToSendStuffBit(0);
+	ToSendStuffBit(0);
+	ToSendStuffBit(1);  // 1
+	ToSendStuffBit(0);
+	ToSendStuffBit(0);
+	ToSendStuffBit(0);
+
+	// Send startbit
+	ToSend[++ToSendMax] = SEC_D;
+
+	uint8_t b = cmd;
+	for(i = 0; i < 4; i++) {
+		if(b & 1) {
+			ToSend[++ToSendMax] = SEC_D;
+		} else {
+			ToSend[++ToSendMax] = SEC_E;
+		}
+		b >>= 1;
+	}
+
+	// Send stopbit
+	ToSend[++ToSendMax] = SEC_F;
+
+	// Flush the buffer in FPGA!!
+	for(i = 0; i < 5; i++) {
+		ToSend[++ToSendMax] = SEC_F;
+	}
+
+    // Convert from last byte pos to length
+    ToSendMax++;
 }
 
 //-----------------------------------------------------------------------------
@@ -924,6 +981,7 @@ static int GetIso14443aCommandFromReader(uint8_t *received, int *len, int maxLen
         }
     }
 }
+static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded);
 
 //-----------------------------------------------------------------------------
 // Main loop of simulated tag: receive commands from reader, decide what
@@ -1054,7 +1112,7 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
     memcpy(resp3a, ToSend, ToSendMax); resp3aLen = ToSendMax;
 
 	// Strange answer is an example of rare message size (3 bits)
-	CodeStrangeAnswer();
+	CodeStrangeAnswerAsTag();
 	memcpy(resp4, ToSend, ToSendMax); resp4Len = ToSendMax;
 
 	// Authentication answer (random nonce)
@@ -1140,10 +1198,11 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
 				receivedCmd[0], receivedCmd[1], receivedCmd[2]);
         } else {
             // Never seen this command before
-		Dbprintf("Unknown command received from reader: %x %x %x %x %x %x %x %x %x",
+		Dbprintf("Unknown command received from reader (len=%d): %x %x %x %x %x %x %x %x %x",
+			len,
 			receivedCmd[0], receivedCmd[1], receivedCmd[2],
-			receivedCmd[3], receivedCmd[3], receivedCmd[4],
-			receivedCmd[5], receivedCmd[6], receivedCmd[7]);
+			receivedCmd[3], receivedCmd[4], receivedCmd[5],
+			receivedCmd[6], receivedCmd[7], receivedCmd[8]);
 			// Do not respond
 			resp = resp1; respLen = 0; order = 0;
         }
@@ -1171,8 +1230,13 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
 		}
 
         if(respLen <= 0) continue;
+		//----------------------------
+		u = 0;
+		b = 0x00;
+		fdt_indicator = FALSE;
 
-        // Modulate Manchester
+		EmSendCmd14443aRaw(resp, respLen, receivedCmd[0] == 0x52);
+/*        // Modulate Manchester
 		FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
         AT91C_BASE_SSC->SSC_THR = 0x00;
         FpgaSetupSsc();
@@ -1204,7 +1268,7 @@ ComputeCrc14443(CRC_14443_A, response3a, 1, &response3a[1], &response3a[2]);
 			    break;
 			}
         }
-
+*/
     }
 
 	Dbprintf("%x %x %x", happened, happened2, cmdsRecvd);
@@ -1389,6 +1453,156 @@ void CodeIso14443aAsReaderPar(const uint8_t * cmd, int len, uint32_t dwParity)
   ToSendMax++;
 }
 
+//-----------------------------------------------------------------------------
+// Wait for commands from reader
+// Stop when button is pressed (return 1) or field was gone (return 2)
+// Or return 0 when command is captured
+//-----------------------------------------------------------------------------
+static int EmGetCmd(uint8_t *received, int *len, int maxLen)
+{
+	*len = 0;
+
+	uint32_t timer = 0, vtime = 0;
+	int analogCnt = 0;
+	int analogAVG = 0;
+
+	// 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
+	LED_D_OFF();
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+
+	// Set ADC to read field strength
+	AT91C_BASE_ADC->ADC_CR = AT91C_ADC_SWRST;
+	AT91C_BASE_ADC->ADC_MR =
+				ADC_MODE_PRESCALE(32) |
+				ADC_MODE_STARTUP_TIME(16) |
+				ADC_MODE_SAMPLE_HOLD_TIME(8);
+	AT91C_BASE_ADC->ADC_CHER = ADC_CHANNEL(ADC_CHAN_HF);
+	// start ADC
+	AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
+	
+	// Now run a 'software UART' on the stream of incoming samples.
+	Uart.output = received;
+	Uart.byteCntMax = maxLen;
+	Uart.state = STATE_UNSYNCD;
+
+	for(;;) {
+		WDT_HIT();
+
+		if (BUTTON_PRESS()) return 1;
+
+		// test if the field exists
+		if (AT91C_BASE_ADC->ADC_SR & ADC_END_OF_CONVERSION(ADC_CHAN_HF)) {
+			analogCnt++;
+			analogAVG += AT91C_BASE_ADC->ADC_CDR[ADC_CHAN_HF];
+			AT91C_BASE_ADC->ADC_CR = AT91C_ADC_START;
+			if (analogCnt >= 32) {
+				if ((33000 * (analogAVG / analogCnt) >> 10) < MF_MINFIELDV) {
+					vtime = GetTickCount();
+					if (!timer) timer = vtime;
+					// 50ms no field --> card to idle state
+					if (vtime - timer > 50) return 2;
+				} else
+					if (timer) timer = 0;
+				analogCnt = 0;
+				analogAVG = 0;
+			}
+		}
+		// transmit none
+		if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+			AT91C_BASE_SSC->SSC_THR = 0x00;
+		}
+		// receive and test the miller decoding
+		if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+			volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+			if(MillerDecoding((b & 0xf0) >> 4)) {
+				*len = Uart.byteCnt;
+				if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE);
+				return 0;
+			}
+			if(MillerDecoding(b & 0x0f)) {
+				*len = Uart.byteCnt;
+				if (tracing) LogTrace(received, *len, GetDeltaCountUS(), Uart.parityBits, TRUE);
+				return 0;
+			}
+		}
+	}
+}
+
+static int EmSendCmd14443aRaw(uint8_t *resp, int respLen, int correctionNeeded)
+{
+	int i, u = 0;
+	uint8_t b = 0;
+
+	// Modulate Manchester
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_MOD);
+	AT91C_BASE_SSC->SSC_THR = 0x00;
+	FpgaSetupSsc();
+	
+	// include correction bit
+	i = 1;
+	if((Uart.parityBits & 0x01) || correctionNeeded) {
+		// 1236, so correction bit needed
+		i = 0;
+	}
+	
+	// send cycle
+	for(;;) {
+		if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_RXRDY)) {
+			volatile uint8_t b = (uint8_t)AT91C_BASE_SSC->SSC_RHR;
+			(void)b;
+		}
+		if(AT91C_BASE_SSC->SSC_SR & (AT91C_SSC_TXRDY)) {
+			if(i > respLen) {
+				b = 0xff; // was 0x00
+				u++;
+			} else {
+				b = resp[i];
+				i++;
+			}
+			AT91C_BASE_SSC->SSC_THR = b;
+
+			if(u > 4) break;
+		}
+		if(BUTTON_PRESS()) {
+			break;
+		}
+	}
+
+	return 0;
+}
+
+int EmSend4bitEx(uint8_t resp, int correctionNeeded){
+  Code4bitAnswerAsTag(resp);
+	int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
+  if (tracing) LogTrace(&resp, 1, GetDeltaCountUS(), GetParity(&resp, 1), FALSE);
+	return res;
+}
+
+int EmSend4bit(uint8_t resp){
+	return EmSend4bitEx(resp, 0);
+}
+
+int EmSendCmdExPar(uint8_t *resp, int respLen, int correctionNeeded, uint32_t par){
+  CodeIso14443aAsTagPar(resp, respLen, par);
+	int res = EmSendCmd14443aRaw(ToSend, ToSendMax, correctionNeeded);
+  if (tracing) LogTrace(resp, respLen, GetDeltaCountUS(), par, FALSE);
+	return res;
+}
+
+int EmSendCmdEx(uint8_t *resp, int respLen, int correctionNeeded){
+	return EmSendCmdExPar(resp, respLen, correctionNeeded, GetParity(resp, respLen));
+}
+
+int EmSendCmd(uint8_t *resp, int respLen){
+	return EmSendCmdExPar(resp, respLen, 0, GetParity(resp, respLen));
+}
+
+int EmSendCmdPar(uint8_t *resp, int respLen, uint32_t par){
+	return EmSendCmdExPar(resp, respLen, 0, par);
+}
+
 //-----------------------------------------------------------------------------
 // Wait a certain time for tag response
 //  If a response is captured return TRUE
@@ -1478,8 +1692,18 @@ void ReaderTransmit(uint8_t* frame, int len)
 int ReaderReceive(uint8_t* receivedAnswer)
 {
   int samples = 0;
-  if (!GetIso14443aAnswerFromTag(receivedAnswer,100,&samples,0)) return FALSE;
+  if (!GetIso14443aAnswerFromTag(receivedAnswer,160,&samples,0)) return FALSE;
+  if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE);
+  if(samples == 0) return FALSE;
+  return Demod.len;
+}
+
+int ReaderReceivePar(uint8_t* receivedAnswer, uint32_t * parptr)
+{
+  int samples = 0;
+  if (!GetIso14443aAnswerFromTag(receivedAnswer,160,&samples,0)) return FALSE;
   if (tracing) LogTrace(receivedAnswer,Demod.len,samples,Demod.parityBits,FALSE);
+	*parptr = Demod.parityBits;
   if(samples == 0) return FALSE;
   return Demod.len;
 }
@@ -1487,19 +1711,21 @@ int ReaderReceive(uint8_t* receivedAnswer)
 /* performs iso14443a anticolision procedure
  * fills the uid pointer unless NULL
  * fills resp_data unless NULL */
-int iso14443a_select_card(uint8_t * uid_ptr, iso14a_card_select_t * resp_data) {
-	uint8_t wupa[]       = { 0x52 };
+int iso14443a_select_card(uint8_t * uid_ptr, iso14a_card_select_t * resp_data, uint32_t * cuid_ptr) {
+	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* resp = (((uint8_t *)BigBuf) + 3560);	// was 3560 - tied to other size changes
-	uint8_t* uid  = resp + 7;
 
 	uint8_t sak = 0x04; // cascade uid
 	int cascade_level = 0;
 
 	int len;
+	
+	// clear uid
+	memset(uid_ptr, 0, 8);
 
 	// Broadcast for a card, WUPA (0x52) will force response from all cards in the field
 	ReaderTransmitShort(wupa);
@@ -1509,9 +1735,6 @@ int iso14443a_select_card(uint8_t * uid_ptr, iso14a_card_select_t * resp_data) {
 	if(resp_data)
 		memcpy(resp_data->atqa, resp, 2);
 	
-	ReaderTransmit(sel_all,sizeof(sel_all)); 
-	if(!ReaderReceive(uid)) return 0;
-
 	// OK we will select at least at cascade 1, lets see if first byte of UID was 0x88 in
 	// which case we need to make a cascade 2 request and select - this is a long UID
 	// While the UID is not complete, the 3nd bit (from the right) is set in the SAK.
@@ -1524,6 +1747,9 @@ int iso14443a_select_card(uint8_t * uid_ptr, iso14a_card_select_t * resp_data) {
 		ReaderTransmit(sel_all,sizeof(sel_all));
 		if (!ReaderReceive(resp)) return 0;
 		if(uid_ptr) memcpy(uid_ptr + cascade_level*4, resp, 4);
+		
+		// calculate crypto UID
+		if(cuid_ptr) *cuid_ptr = bytes_to_num(resp, 4);
 
 		// Construct SELECT UID command
 		memcpy(sel_uid+2,resp,5);
@@ -1538,19 +1764,26 @@ int iso14443a_select_card(uint8_t * uid_ptr, iso14a_card_select_t * resp_data) {
 		resp_data->sak = sak;
 		resp_data->ats_len = 0;
 	}
+	//--  this byte not UID, it CT.  http://www.nxp.com/documents/application_note/AN10927.pdf  page 3
+	if (uid_ptr[0] == 0x88) {  
+		memcpy(uid_ptr, uid_ptr + 1, 7);
+		uid_ptr[7] = 0;
+	}
 
 	if( (sak & 0x20) == 0)
 		return 2; // non iso14443a compliant tag
 
 	// Request for answer to select
-	AppendCrc14443a(rats, 2);
-	ReaderTransmit(rats, sizeof(rats));
-	if (!(len = ReaderReceive(resp))) return 0;
-	if(resp_data) {
+	if(resp_data) {  // JCOP cards - if reader sent RATS then there is no MIFARE session at all!!!
+		AppendCrc14443a(rats, 2);
+		ReaderTransmit(rats, sizeof(rats));
+		
+		if (!(len = ReaderReceive(resp))) return 0;
+		
 		memcpy(resp_data->ats, resp, sizeof(resp_data->ats));
 		resp_data->ats_len = len;
 	}
-
+	
 	return 1;
 }
 
@@ -1604,7 +1837,7 @@ void ReaderIso14443a(UsbCommand * c, UsbCommand * ack)
 
 	if(param & ISO14A_CONNECT) {
 		iso14443a_setup();
-		ack->arg[0] = iso14443a_select_card(ack->d.asBytes, (iso14a_card_select_t *) (ack->d.asBytes+12));
+		ack->arg[0] = iso14443a_select_card(ack->d.asBytes, (iso14a_card_select_t *) (ack->d.asBytes+12), NULL);
 		UsbSendPacket((void *)ack, sizeof(UsbCommand));
 	}
 
@@ -1647,11 +1880,11 @@ void ReaderMifare(uint32_t parameter)
 {
 	// Mifare AUTH
 	uint8_t mf_auth[]    = { 0x60,0x00,0xf5,0x7b };
-  uint8_t mf_nr_ar[]   = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
+	uint8_t mf_nr_ar[]   = { 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00 };
 
-  uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + 3560);	// was 3560 - tied to other size changes
-  traceLen = 0;
-  tracing = false;
+	uint8_t* receivedAnswer = (((uint8_t *)BigBuf) + 3560);	// was 3560 - tied to other size changes
+	traceLen = 0;
+	tracing = false;
 
 	iso14443a_setup();
 
@@ -1659,83 +1892,448 @@ void ReaderMifare(uint32_t parameter)
 	LED_B_OFF();
 	LED_C_OFF();
 
-  byte_t nt_diff = 0;
-  LED_A_OFF();
-  byte_t par = 0;
-  byte_t par_mask = 0xff;
-  byte_t par_low = 0;
-  int led_on = TRUE;
-
-  tracing = FALSE;
-  byte_t nt[4];
-  byte_t nt_attacked[4];
-  byte_t par_list[8];
-  byte_t ks_list[8];
-  num_to_bytes(parameter,4,nt_attacked);
-
-  while(TRUE)
-  {
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
-    SpinDelay(200);
-    FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
-
-    // Test if the action was cancelled
-    if(BUTTON_PRESS()) {
-      break;
-    }
+	byte_t nt_diff = 0;
+	LED_A_OFF();
+	byte_t par = 0;
+	byte_t par_mask = 0xff;
+	byte_t par_low = 0;
+	int led_on = TRUE;
+	uint8_t uid[8];
+	uint32_t cuid;
+
+	tracing = FALSE;
+	byte_t nt[4] = {0,0,0,0};
+	byte_t nt_attacked[4], nt_noattack[4];
+	byte_t par_list[8] = {0,0,0,0,0,0,0,0};
+	byte_t ks_list[8] = {0,0,0,0,0,0,0,0};
+	num_to_bytes(parameter, 4, nt_noattack);
+	int isOK = 0, isNULL = 0;
+
+	while(TRUE)
+	{
+		LED_C_ON();
+		FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+		SpinDelay(200);
+		FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_READER_MOD);
+		LED_C_OFF();
+
+		// Test if the action was cancelled
+		if(BUTTON_PRESS()) {
+			break;
+		}
 
-    if(!iso14443a_select_card(NULL, NULL)) continue;
+		if(!iso14443a_select_card(uid, NULL, &cuid)) continue;
 
-    // Transmit MIFARE_CLASSIC_AUTH
-    ReaderTransmit(mf_auth,sizeof(mf_auth));
+		// Transmit MIFARE_CLASSIC_AUTH
+		ReaderTransmit(mf_auth, sizeof(mf_auth));
 
-    // Receive the (16 bit) "random" nonce
-    if (!ReaderReceive(receivedAnswer)) continue;
-    memcpy(nt,receivedAnswer,4);
+		// Receive the (16 bit) "random" nonce
+		if (!ReaderReceive(receivedAnswer)) continue;
+		memcpy(nt, receivedAnswer, 4);
 
-    // Transmit reader nonce and reader answer
-    ReaderTransmitPar(mf_nr_ar,sizeof(mf_nr_ar),par);
+		// Transmit reader nonce and reader answer
+		ReaderTransmitPar(mf_nr_ar, sizeof(mf_nr_ar),par);
 
-    // Receive 4 bit answer
-    if (ReaderReceive(receivedAnswer))
-    {
-      if (nt_diff == 0)
-      {
-        LED_A_ON();
-        memcpy(nt_attacked,nt,4);
-        par_mask = 0xf8;
-        par_low = par & 0x07;
-      }
+		// Receive 4 bit answer
+		if (ReaderReceive(receivedAnswer))
+		{
+			if ( (parameter != 0) && (memcmp(nt, nt_noattack, 4) == 0) ) continue;
+
+			isNULL = (nt_attacked[0] = 0) && (nt_attacked[1] = 0) && (nt_attacked[2] = 0) && (nt_attacked[3] = 0);
+			if ( (isNULL != 0 ) && (memcmp(nt, nt_attacked, 4) != 0) ) continue;
 
-      if (memcmp(nt,nt_attacked,4) != 0) continue;
+			if (nt_diff == 0)
+			{
+				LED_A_ON();
+				memcpy(nt_attacked, nt, 4);
+				par_mask = 0xf8;
+				par_low = par & 0x07;
+			}
 
-      led_on = !led_on;
-      if(led_on) LED_B_ON(); else LED_B_OFF();
-      par_list[nt_diff] = par;
-      ks_list[nt_diff] = receivedAnswer[0]^0x05;
+			led_on = !led_on;
+			if(led_on) LED_B_ON(); else LED_B_OFF();
+			par_list[nt_diff] = par;
+			ks_list[nt_diff] = receivedAnswer[0] ^ 0x05;
 
-      // Test if the information is complete
-      if (nt_diff == 0x07) break;
+			// Test if the information is complete
+			if (nt_diff == 0x07) {
+				isOK = 1;
+				break;
+			}
 
-      nt_diff = (nt_diff+1) & 0x07;
-      mf_nr_ar[3] = nt_diff << 5;
-      par = par_low;
-    } else {
-      if (nt_diff == 0)
-      {
-        par++;
-      } else {
-        par = (((par>>3)+1) << 3) | par_low;
-      }
-    }
-  }
+			nt_diff = (nt_diff + 1) & 0x07;
+			mf_nr_ar[3] = nt_diff << 5;
+			par = par_low;
+		} else {
+			if (nt_diff == 0)
+			{
+				par++;
+			} else {
+				par = (((par >> 3) + 1) << 3) | par_low;
+			}
+		}
+	}
+
+	LogTrace(nt, 4, 0, GetParity(nt, 4), TRUE);
+	LogTrace(par_list, 8, 0, GetParity(par_list, 8), TRUE);
+	LogTrace(ks_list, 8, 0, GetParity(ks_list, 8), TRUE);
+
+	UsbCommand ack = {CMD_ACK, {isOK, 0, 0}};
+	memcpy(ack.d.asBytes + 0,  uid, 4);
+	memcpy(ack.d.asBytes + 4,  nt, 4);
+	memcpy(ack.d.asBytes + 8,  par_list, 8);
+	memcpy(ack.d.asBytes + 16, ks_list, 8);
+		
+	LED_B_ON();
+	UsbSendPacket((uint8_t *)&ack, sizeof(UsbCommand));
+	LED_B_OFF();	
+
+	// Thats it...
+	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
+	LEDsoff();
+	tracing = TRUE;
+	
+	if (MF_DBGLEVEL >= 1)	DbpString("COMMAND mifare FINISHED");
+}
+
+
+//-----------------------------------------------------------------------------
+// MIFARE 1K simulate. 
+// 
+//-----------------------------------------------------------------------------
+void Mifare1ksim(uint8_t arg0, uint8_t arg1, uint8_t arg2, uint8_t *datain)
+{
+	int cardSTATE = MFEMUL_NOFIELD;
+	int _7BUID = 0;
+	int vHf = 0;	// in mV
+	int nextCycleTimeout = 0;
+	int res;
+	uint32_t timer = 0;
+	uint32_t selTimer = 0;
+	uint32_t authTimer = 0;
+	uint32_t par = 0;
+	int len = 0;
+	uint8_t cardWRBL = 0;
+	uint8_t cardAUTHSC = 0;
+	uint8_t cardAUTHKEY = 0xff;  // no authentication
+	uint32_t cuid = 0;
+	struct Crypto1State mpcs = {0, 0};
+	struct Crypto1State *pcs;
+	pcs = &mpcs;
+	
+	uint64_t key64 = 0xffffffffffffULL;
+	
+	uint8_t* receivedCmd = eml_get_bigbufptr_recbuf();
+	uint8_t *response = eml_get_bigbufptr_sendbuf();
+	
+	static uint8_t rATQA[] = {0x04, 0x00}; // Mifare classic 1k 4BUID
+
+	static uint8_t rUIDBCC1[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; 
+	static uint8_t rUIDBCC2[] = {0xde, 0xad, 0xbe, 0xaf, 0x62}; // !!!
+		
+	static uint8_t rSAK[] = {0x08, 0xb6, 0xdd};
+	static uint8_t rSAK1[] = {0x04, 0xda, 0x17};
+
+	static uint8_t rAUTH_NT[] = {0x1a, 0xac, 0xff, 0x4f};
+	static uint8_t rAUTH_AT[] = {0x00, 0x00, 0x00, 0x00};
+	
+	// clear trace
+	traceLen = 0;
+	tracing = true;
+	
+	// get UID from emul memory
+	emlGetMemBt(receivedCmd, 7, 1);
+	_7BUID = !(receivedCmd[0] == 0x00);
+	if (!_7BUID) {                     // ---------- 4BUID
+		rATQA[0] = 0x04;
+
+		emlGetMemBt(rUIDBCC1, 0, 4);
+		rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
+	} else {                           // ---------- 7BUID
+		rATQA[0] = 0x44;
+
+		rUIDBCC1[0] = 0x88;
+		emlGetMemBt(&rUIDBCC1[1], 0, 3);
+		rUIDBCC1[4] = rUIDBCC1[0] ^ rUIDBCC1[1] ^ rUIDBCC1[2] ^ rUIDBCC1[3];
+		emlGetMemBt(rUIDBCC2, 3, 4);
+		rUIDBCC2[4] = rUIDBCC2[0] ^ rUIDBCC2[1] ^ rUIDBCC2[2] ^ rUIDBCC2[3];
+	}
+
+// --------------------------------------	test area
+
+   // Authenticate response - nonce
+    uint8_t *resp1 = (((uint8_t *)BigBuf) + EML_RESPONSES);
+    int resp1Len;
+//    uint8_t *resp2 = (((uint8_t *)BigBuf) + EML_RESPONSES + 200);
+//    int resp2Len;
+	CodeIso14443aAsTag(rAUTH_NT, sizeof(rAUTH_NT));
+    memcpy(resp1, ToSend, ToSendMax); resp1Len = ToSendMax;
+		
+	timer = GetTickCount();
+	uint32_t nonce = bytes_to_num(rAUTH_NT, 4);
+	uint32_t rn_enc = 0x98d76b77; // !!!!!!!!!!!!!!!!!
+	uint32_t ans = 0;
+	cuid = bytes_to_num(rUIDBCC1, 4);
+/*	
+	crypto1_create(pcs, key64);
+  crypto1_word(pcs, cuid ^ nonce, 0);
+  crypto1_word(pcs, rn_enc , 1);
+  crypto1_word(pcs, 0, 0);
+  ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0);
+	num_to_bytes(ans, 4, rAUTH_AT);
+	CodeIso14443aAsTag(rAUTH_AT, sizeof(rAUTH_AT));
+  memcpy(resp2, ToSend, ToSendMax); resp2Len = ToSendMax;
+	Dbprintf("crypto auth time: %d", GetTickCount() - timer);
+*/
+// --------------------------------------	END test area
+	// start mkseconds counter
+	StartCountUS();
+
+	// We need to listen to the high-frequency, peak-detected path.
+	SetAdcMuxFor(GPIO_MUXSEL_HIPKD);
+	FpgaSetupSsc();
+
+  FpgaWriteConfWord(FPGA_MAJOR_MODE_HF_ISO14443A | FPGA_HF_ISO14443A_TAGSIM_LISTEN);
+	SpinDelay(200);
+
+	Dbprintf("--> start. 7buid=%d", _7BUID);
+	// calibrate mkseconds counter
+	GetDeltaCountUS();
+	while (true) {
+		WDT_HIT();
+
+		if(BUTTON_PRESS()) {
+			break;
+		}
+
+		// find reader field
+		// Vref = 3300mV, and an 10:1 voltage divider on the input
+		// can measure voltages up to 33000 mV
+		if (cardSTATE == MFEMUL_NOFIELD) {
+			vHf = (33000 * AvgAdc(ADC_CHAN_HF)) >> 10;
+			if (vHf > MF_MINFIELDV) {
+				cardSTATE = MFEMUL_IDLE;
+				LED_A_ON();
+			}
+		} 
+
+		if (cardSTATE != MFEMUL_NOFIELD) {
+			res = EmGetCmd(receivedCmd, &len, 100); // (+ nextCycleTimeout)
+			if (res == 2) {
+				cardSTATE = MFEMUL_NOFIELD;
+				LEDsoff();
+				continue;
+			}
+			if(res) break;
+		}
+		
+		nextCycleTimeout = 0;
+		
+//		if (len) Dbprintf("len:%d cmd: %02x %02x %02x %02x", len, receivedCmd[0], receivedCmd[1], receivedCmd[2], receivedCmd[3]);
+
+		if (len != 4 && cardSTATE != MFEMUL_NOFIELD) { // len != 4 <---- speed up the code 4 authentication
+			// REQ or WUP request in ANY state and WUP in HALTED state
+			if (len == 1 && ((receivedCmd[0] == 0x26 && cardSTATE != MFEMUL_HALTED) || receivedCmd[0] == 0x52)) {
+				selTimer = GetTickCount();
+				EmSendCmdEx(rATQA, sizeof(rATQA), (receivedCmd[0] == 0x52));
+				cardSTATE = MFEMUL_SELECT1;
+
+				// init crypto block
+				LED_B_OFF();
+				LED_C_OFF();
+				crypto1_destroy(pcs);
+				cardAUTHKEY = 0xff;
+			}
+		}
+		
+		switch (cardSTATE) {
+			case MFEMUL_NOFIELD:{
+				break;
+			}
+			case MFEMUL_HALTED:{
+				break;
+			}
+			case MFEMUL_IDLE:{
+				break;
+			}
+			case MFEMUL_SELECT1:{
+				// select all
+				if (len == 2 && (receivedCmd[0] == 0x93 && receivedCmd[1] == 0x20)) {
+					EmSendCmd(rUIDBCC1, sizeof(rUIDBCC1));
+				}
+
+				// select card
+				if (len == 9 && 
+						(receivedCmd[0] == 0x93 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC1, 4) == 0)) {
+					if (!_7BUID) 
+						EmSendCmd(rSAK, sizeof(rSAK));
+					else
+						EmSendCmd(rSAK1, sizeof(rSAK1));
+
+					cuid = bytes_to_num(rUIDBCC1, 4);
+					if (!_7BUID) {
+						cardSTATE = MFEMUL_WORK;
+					} else {
+						cardSTATE = MFEMUL_SELECT2;
+						break;
+					}
+					LED_B_ON();
+					Dbprintf("--> WORK. anticol1 time: %d", GetTickCount() - selTimer);
+				}
+				
+				break;
+			}
+			case MFEMUL_SELECT2:{
+				if (len == 2 && (receivedCmd[0] == 0x95 && receivedCmd[1] == 0x20)) {
+					EmSendCmd(rUIDBCC2, sizeof(rUIDBCC2));
+					break;
+				}
 
-  LogTrace(nt,4,0,GetParity(nt,4),TRUE);
-  LogTrace(par_list,8,0,GetParity(par_list,8),TRUE);
-  LogTrace(ks_list,8,0,GetParity(ks_list,8),TRUE);
+				// select 2 card
+				if (len == 9 && 
+						(receivedCmd[0] == 0x95 && receivedCmd[1] == 0x70 && memcmp(&receivedCmd[2], rUIDBCC2, 4) == 0)) {
+					EmSendCmd(rSAK, sizeof(rSAK));
+
+					cuid = bytes_to_num(rUIDBCC2, 4);
+					cardSTATE = MFEMUL_WORK;
+					LED_B_ON();
+					Dbprintf("--> WORK. anticol2 time: %d", GetTickCount() - selTimer);
+					break;
+				}
+				// TODO: goto work state - i guess there is a command
+				break;
+			}
+			case MFEMUL_AUTH1:{
+				if (len == 8) {
+// ---------------------------------
+	rn_enc = bytes_to_num(receivedCmd, 4);
+	crypto1_create(pcs, key64);
+  crypto1_word(pcs, cuid ^ nonce, 0);
+  crypto1_word(pcs, rn_enc , 1);
+  crypto1_word(pcs, 0, 0);
+  ans = prng_successor(nonce, 96) ^ crypto1_word(pcs, 0, 0);
+	num_to_bytes(ans, 4, rAUTH_AT);
+// ---------------------------------
+				EmSendCmd(rAUTH_AT, sizeof(rAUTH_AT));
+					cardSTATE = MFEMUL_AUTH2;
+				} else {
+					cardSTATE = MFEMUL_IDLE;
+					LED_B_OFF();
+					LED_C_OFF();
+				}
+				if (cardSTATE != MFEMUL_AUTH2) break;
+			}
+			case MFEMUL_AUTH2:{
+				// test auth info here...
+
+				LED_C_ON();
+				cardSTATE = MFEMUL_WORK;
+Dbprintf("AUTH COMPLETED. sec=%d, key=%d time=%d", cardAUTHSC, cardAUTHKEY, GetTickCount() - authTimer);
+				break;
+			}
+			case MFEMUL_WORK:{
+				// auth
+				if (len == 4 && (receivedCmd[0] == 0x60 || receivedCmd[0] == 0x61)) {
+authTimer = GetTickCount();
+//					EmSendCmd(rAUTH_NT, sizeof(rAUTH_NT));
+//SpinDelayUs(190);
+					EmSendCmd14443aRaw(resp1, resp1Len, 0);
+LogTrace(NULL, 0, GetDeltaCountUS(), 0, TRUE);
+//					crypto1_create(pcs, key64);
+//					if (cardAUTHKEY == 0xff) { // first auth
+//					crypto1_word(pcs, cuid ^ bytes_to_num(rAUTH_NT, 4), 0); // uid ^ nonce
+//					} else { // nested auth
+//					}
+
+					cardAUTHSC = receivedCmd[1] / 4;  // received block num
+					cardAUTHKEY = receivedCmd[0] - 0x60;
+					cardSTATE = MFEMUL_AUTH1;
+					nextCycleTimeout = 10;
+					break;
+				}
+				
+				if (len == 0) break;
+				
+				// decrypt seqence
+				if (cardAUTHKEY != 0xff) mf_crypto1_decrypt(pcs, receivedCmd, len);
+				
+				// rule 13 of 7.5.3. in ISO 14443-4. chaining shall be continued
+				// BUT... ACK --> NACK
+				if (len == 1 && receivedCmd[0] == CARD_ACK) {
+					EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+					break;
+				}
+				
+				// rule 12 of 7.5.3. in ISO 14443-4. R(NAK) --> R(ACK)
+				if (len == 1 && receivedCmd[0] == CARD_NACK_NA) {
+					EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+					break;
+				}
+				
+				// read block
+				if (len == 4 && receivedCmd[0] == 0x30) {
+					if (receivedCmd[1] >= 16 * 4) {
+						EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+						break;
+					}
+					emlGetMem(response, receivedCmd[1], 1);
+					AppendCrc14443a(response, 16);
+					mf_crypto1_encrypt(pcs, response, 18, &par);
+					EmSendCmdPar(response, 18, par);
+					break;
+				}
+				
+				// write block
+				if (len == 4 && receivedCmd[0] == 0xA0) {
+					if (receivedCmd[1] >= 16 * 4) {
+						EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+						break;
+					}
+					EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+					nextCycleTimeout = 50;
+					cardSTATE = MFEMUL_WRITEBL2;
+					cardWRBL = receivedCmd[1];
+					break;
+				}
+			
+				// halt
+				if (len == 4 && (receivedCmd[0] == 0x50 && receivedCmd[1] == 0x00)) {
+					cardSTATE = MFEMUL_HALTED;
+					LED_B_OFF();
+					LED_C_OFF();
+					Dbprintf("--> HALTED. Selected time: %d ms",  GetTickCount() - selTimer);
+					break;
+				}
+				break;
+
+				// command not allowed
+				if (len == 4) {
+					EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_NACK_NA));
+					break;
+				}
+			}
+			case MFEMUL_WRITEBL2:{
+				if (len == 18){
+					mf_crypto1_decrypt(pcs, receivedCmd, len);
+					emlSetMem(receivedCmd, cardWRBL, 1);
+					EmSend4bit(mf_crypto1_encrypt4bit(pcs, CARD_ACK));
+					cardSTATE = MFEMUL_WORK;
+					break;
+				}
+Dbprintf("err write block: %d len:%d", cardWRBL, len);
+				break;
+			}
+		
+		}
+	
+	}
 
-  // Thats it...
 	FpgaWriteConfWord(FPGA_MAJOR_MODE_OFF);
 	LEDsoff();
-  tracing = TRUE;
+
+	// add trace trailer
+	memset(rAUTH_NT, 0x44, 4);
+	LogTrace(rAUTH_NT, 4, 0, 0, TRUE);
+
+	DbpString("Emulator stopped.");
 }