X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/489e1745415038d3d315247f8cdad080c14eb95b..b7eddc14db9262a51ad3100ade7386d03500ace8:/client/cmdlfem4x.c

diff --git a/client/cmdlfem4x.c b/client/cmdlfem4x.c
index 125d8ab9..eddeec56 100644
--- a/client/cmdlfem4x.c
+++ b/client/cmdlfem4x.c
@@ -11,17 +11,32 @@
 #include <stdio.h>
 #include <string.h>
 #include <inttypes.h>
-//#include "proxusb.h"
 #include "proxmark3.h"
 #include "ui.h"
+#include "util.h"
 #include "graph.h"
 #include "cmdparser.h"
 #include "cmddata.h"
 #include "cmdlf.h"
 #include "cmdlfem4x.h"
+#include "lfdemod.h"
+
+#define llx PRIx64
+
+char *global_em410xId;
 
 static int CmdHelp(const char *Cmd);
 
+int CmdEMdemodASK(const char *Cmd)
+{
+	char cmdp = param_getchar(Cmd, 0);
+	int findone = (cmdp == '1') ? 1 : 0;
+	UsbCommand c={CMD_EM410X_DEMOD};
+	c.arg[0]=findone;
+	SendCommand(&c);
+	return 0;
+}
+
 /* Read the ID of an EM410x tag.
  * Format:
  *   1111 1111 1           <-- standard non-repeatable header
@@ -32,387 +47,131 @@ static int CmdHelp(const char *Cmd);
  */
 int CmdEM410xRead(const char *Cmd)
 {
-  int i, j, clock, header, rows, bit, hithigh, hitlow, first, bit2idx, high, low;
-  int parity[4];
-  char id[11];
-  int retested = 0;
-  uint8_t BitStream[MAX_GRAPH_TRACE_LEN];
-  high = low = 0;
-
-  /* Detect high and lows and clock */
-  for (i = 0; i < GraphTraceLen; i++)
-  {
-    if (GraphBuffer[i] > high)
-      high = GraphBuffer[i];
-    else if (GraphBuffer[i] < low)
-      low = GraphBuffer[i];
-  }
-
-  /* get clock */
-  clock = GetClock(Cmd, high, 0);
-
-  /* parity for our 4 columns */
-  parity[0] = parity[1] = parity[2] = parity[3] = 0;
-  header = rows = 0;
-
-  /* manchester demodulate */
-  bit = bit2idx = 0;
-  for (i = 0; i < (int)(GraphTraceLen / clock); i++)
-  {
-    hithigh = 0;
-    hitlow = 0;
-    first = 1;
-
-    /* Find out if we hit both high and low peaks */
-    for (j = 0; j < clock; j++)
-    {
-      if (GraphBuffer[(i * clock) + j] == high)
-        hithigh = 1;
-      else if (GraphBuffer[(i * clock) + j] == low)
-        hitlow = 1;
-
-      /* it doesn't count if it's the first part of our read
-       because it's really just trailing from the last sequence */
-      if (first && (hithigh || hitlow))
-        hithigh = hitlow = 0;
-      else
-        first = 0;
-
-      if (hithigh && hitlow)
-        break;
-    }
-
-    /* If we didn't hit both high and low peaks, we had a bit transition */
-    if (!hithigh || !hitlow)
-      bit ^= 1;
-
-    BitStream[bit2idx++] = bit;
-  }
-
-retest:
-  /* We go till 5 before the graph ends because we'll get that far below */
-  for (i = 1; i < bit2idx - 5; i++)
-  {
-    /* Step 2: We have our header but need our tag ID */
-    if (header == 9 && rows < 10)
-    {
-      /* Confirm parity is correct */
-      if ((BitStream[i] ^ BitStream[i+1] ^ BitStream[i+2] ^ BitStream[i+3]) == BitStream[i+4])
-      {
-        /* Read another byte! */
-        sprintf(id+rows, "%x", (8 * BitStream[i]) + (4 * BitStream[i+1]) + (2 * BitStream[i+2]) + (1 * BitStream[i+3]));
-        rows++;
-
-        /* Keep parity info */
-        parity[0] ^= BitStream[i];
-        parity[1] ^= BitStream[i+1];
-        parity[2] ^= BitStream[i+2];
-        parity[3] ^= BitStream[i+3];
-
-        /* Move 4 bits ahead */
-        i += 4;
-      }
-
-      /* Damn, something wrong! reset */
-      else
-      {
-        PrintAndLog("Thought we had a valid tag but failed at word %d (i=%d)", rows + 1, i);
-
-        /* Start back rows * 5 + 9 header bits, -1 to not start at same place */
-        i -= 9 + (5 * rows) - 5;
-
-        rows = header = 0;
-      }
-    }
-
-    /* Step 3: Got our 40 bits! confirm column parity */
-    else if (rows == 10)
-    {
-      /* We need to make sure our 4 bits of parity are correct and we have a stop bit */
-      if (BitStream[i] == parity[0] && BitStream[i+1] == parity[1] &&
-        BitStream[i+2] == parity[2] && BitStream[i+3] == parity[3] &&
-        BitStream[i+4] == 0)
-      {
-        /* Sweet! */
-        PrintAndLog("EM410x Tag ID: %s", id);
-
-        /* Stop any loops */
-        return 1;
-      }
-
-      /* Crap! Incorrect parity or no stop bit, start all over */
-      else
-      {
-        rows = header = 0;
-
-        /* Go back 59 bits (9 header bits + 10 rows at 4+1 parity) */
-        i -= 59;
-      }
-    }
-
-    /* Step 1: get our header */
-    else if (header < 9)
-    {
-      /* Need 9 consecutive 1's */
-      if (BitStream[i] == 1)
-        header++;
-
-      /* We don't have a header, not enough consecutive 1 bits */
-      else
-        header = 0;
-    }
-  }
-
-  /* if we've already retested after flipping bits, return */
-  if (retested++)
-    return 0;
-
-  /* if this didn't work, try flipping bits */
-  for (i = 0; i < bit2idx; i++)
-    BitStream[i] ^= 1;
-
-  goto retest;
+	uint32_t hi=0;
+	uint64_t lo=0;
+
+	if(!AskEm410xDemod("", &hi, &lo, false)) return 0;
+	PrintAndLog("EM410x pattern found: ");
+	printEM410x(hi, lo);
+	if (hi){
+		PrintAndLog ("EM410x XL pattern found");
+		return 0;
+	}
+	char id[12] = {0x00};
+	sprintf(id, "%010llx",lo);
+	
+	global_em410xId = id;
+	return 1;
 }
 
-/* emulate an EM410X tag
- * Format:
- *   1111 1111 1           <-- standard non-repeatable header
- *   XXXX [row parity bit] <-- 10 rows of 5 bits for our 40 bit tag ID
- *   ....
- *   CCCC                  <-- each bit here is parity for the 10 bits above in corresponding column
- *   0                     <-- stop bit, end of tag
- */
+// emulate an EM410X tag
 int CmdEM410xSim(const char *Cmd)
 {
-  int i, n, j, h, binary[4], parity[4];
-
-  /* clock is 64 in EM410x tags */
-  int clock = 64;
-
-  /* clear our graph */
-  ClearGraph(0);
-
-  /* write it out a few times */
-  for (h = 0; h < 4; h++)
-  {
-    /* write 9 start bits */
-    for (i = 0; i < 9; i++)
-      AppendGraph(0, clock, 1);
-
-    /* for each hex char */
-    parity[0] = parity[1] = parity[2] = parity[3] = 0;
-    for (i = 0; i < 10; i++)
-    {
-      /* read each hex char */
-      sscanf(&Cmd[i], "%1x", &n);
-      for (j = 3; j >= 0; j--, n/= 2)
-        binary[j] = n % 2;
-
-      /* append each bit */
-      AppendGraph(0, clock, binary[0]);
-      AppendGraph(0, clock, binary[1]);
-      AppendGraph(0, clock, binary[2]);
-      AppendGraph(0, clock, binary[3]);
-
-      /* append parity bit */
-      AppendGraph(0, clock, binary[0] ^ binary[1] ^ binary[2] ^ binary[3]);
-
-      /* keep track of column parity */
-      parity[0] ^= binary[0];
-      parity[1] ^= binary[1];
-      parity[2] ^= binary[2];
-      parity[3] ^= binary[3];
-    }
-
-    /* parity columns */
-    AppendGraph(0, clock, parity[0]);
-    AppendGraph(0, clock, parity[1]);
-    AppendGraph(0, clock, parity[2]);
-    AppendGraph(0, clock, parity[3]);
-
-    /* stop bit */
-    AppendGraph(0, clock, 0);
-  }
-
-  /* modulate that biatch */
-  CmdManchesterMod("");
-
-  /* booyah! */
-  RepaintGraphWindow();
-  
-  CmdLFSim("");
-  return 0;
+	int i, n, j, binary[4], parity[4];
+
+	char cmdp = param_getchar(Cmd, 0);
+	uint8_t uid[5] = {0x00};
+
+	if (cmdp == 'h' || cmdp == 'H') {
+		PrintAndLog("Usage:  lf em4x 410xsim <UID>");
+		PrintAndLog("");
+		PrintAndLog("     sample: lf em4x 410xsim 0F0368568B");
+		return 0;
+	}
+
+	if (param_gethex(Cmd, 0, uid, 10)) {
+		PrintAndLog("UID must include 10 HEX symbols");
+		return 0;
+	}
+	
+	PrintAndLog("Starting simulating UID %02X%02X%02X%02X%02X", uid[0],uid[1],uid[2],uid[3],uid[4]);
+	PrintAndLog("Press pm3-button to about simulation");
+
+	/* clock is 64 in EM410x tags */
+	int clock = 64;
+
+	/* clear our graph */
+	ClearGraph(0);
+
+		/* write 9 start bits */
+		for (i = 0; i < 9; i++)
+			AppendGraph(0, clock, 1);
+
+		/* for each hex char */
+		parity[0] = parity[1] = parity[2] = parity[3] = 0;
+		for (i = 0; i < 10; i++)
+		{
+			/* read each hex char */
+			sscanf(&Cmd[i], "%1x", &n);
+			for (j = 3; j >= 0; j--, n/= 2)
+				binary[j] = n % 2;
+
+			/* append each bit */
+			AppendGraph(0, clock, binary[0]);
+			AppendGraph(0, clock, binary[1]);
+			AppendGraph(0, clock, binary[2]);
+			AppendGraph(0, clock, binary[3]);
+
+			/* append parity bit */
+			AppendGraph(0, clock, binary[0] ^ binary[1] ^ binary[2] ^ binary[3]);
+
+			/* keep track of column parity */
+			parity[0] ^= binary[0];
+			parity[1] ^= binary[1];
+			parity[2] ^= binary[2];
+			parity[3] ^= binary[3];
+		}
+
+		/* parity columns */
+		AppendGraph(0, clock, parity[0]);
+		AppendGraph(0, clock, parity[1]);
+		AppendGraph(0, clock, parity[2]);
+		AppendGraph(0, clock, parity[3]);
+
+		/* stop bit */
+	AppendGraph(1, clock, 0);
+ 
+	CmdLFSim("0"); //240 start_gap.
+	return 0;
 }
 
-/* Function is equivalent of loread + losamples + em410xread
- * looped until an EM410x tag is detected */
+/* Function is equivalent of lf read + data samples + em410xread
+ * looped until an EM410x tag is detected 
+ * 
+ * Why is CmdSamples("16000")?
+ *  TBD: Auto-grow sample size based on detected sample rate.  IE: If the
+ *       rate gets lower, then grow the number of samples
+ *  Changed by martin, 4000 x 4 = 16000, 
+ *  see http://www.proxmark.org/forum/viewtopic.php?pid=7235#p7235
+*/
 int CmdEM410xWatch(const char *Cmd)
 {
-  int read_h = (*Cmd == 'h');
-  do
-  {
-    CmdLFRead(read_h ? "h" : "");
-    // 2000 samples is OK for clock=64, but not clock=32.  Probably want
-		//   8000 for clock=16.  Don't want to go too high since old HID driver
-		//   is very slow
-		// TBD: Auto-grow sample size based on detected sample rate.  IE: If the
-		//   rate gets lower, then grow the number of samples
-
-    // Changed by martin, 4000 x 4 = 16000, 
-    // see http://www.proxmark.org/forum/viewtopic.php?pid=7235#p7235
-		CmdSamples("16000");
- } while ( ! CmdEM410xRead(""));
-  return 0;
+	do {
+		if (ukbhit()) {
+			printf("\naborted via keyboard!\n");
+			break;
+		}
+		
+		CmdLFRead("s");
+		getSamples("8201",true); //capture enough to get 2 complete preambles (4096*2+9)	
+	} while (!CmdEM410xRead(""));
+
+	return 0;
 }
 
-/* Read the transmitted data of an EM4x50 tag
- * Format:
- *
- *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
- *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
- *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
- *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
- *  CCCCCCCC                         <- column parity bits
- *  0                                <- stop bit
- *  LW                               <- Listen Window
- *
- * This pattern repeats for every block of data being transmitted.
- * Transmission starts with two Listen Windows (LW - a modulated
- * pattern of 320 cycles each (32/32/128/64/64)).
- *
- * Note that this data may or may not be the UID. It is whatever data
- * is stored in the blocks defined in the control word First and Last
- * Word Read values. UID is stored in block 32.
- */
-int CmdEM4x50Read(const char *Cmd)
+//currently only supports manchester modulations
+int CmdEM410xWatchnSpoof(const char *Cmd)
 {
-  int i, j, startblock, skip, block, start, end, low, high;
-  bool complete= false;
-  int tmpbuff[MAX_GRAPH_TRACE_LEN / 64];
-  char tmp[6];
-
-  high= low= 0;
-  memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64);
-
-  /* first get high and low values */
-  for (i = 0; i < GraphTraceLen; i++)
-  {
-    if (GraphBuffer[i] > high)
-      high = GraphBuffer[i];
-    else if (GraphBuffer[i] < low)
-      low = GraphBuffer[i];
-  }
-
-  /* populate a buffer with pulse lengths */
-  i= 0;
-  j= 0;
-  while (i < GraphTraceLen)
-  {
-    // measure from low to low
-    while ((GraphBuffer[i] > low) && (i<GraphTraceLen))
-      ++i;
-    start= i;
-    while ((GraphBuffer[i] < high) && (i<GraphTraceLen))
-      ++i;
-    while ((GraphBuffer[i] > low) && (i<GraphTraceLen))
-      ++i;
-    if (j>(MAX_GRAPH_TRACE_LEN/64)) {
-      break;
-    }
-    tmpbuff[j++]= i - start;
-  }
-
-  /* look for data start - should be 2 pairs of LW (pulses of 192,128) */
-  start= -1;
-  skip= 0;
-  for (i= 0; i < j - 4 ; ++i)
-  {
-    skip += tmpbuff[i];
-    if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
-      if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
-        if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194)
-          if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130)
-          {
-            start= i + 3;
-            break;
-          }
-  }
-  startblock= i + 3;
-
-  /* skip over the remainder of the LW */
-  skip += tmpbuff[i+1]+tmpbuff[i+2];
-  while (skip < MAX_GRAPH_TRACE_LEN && GraphBuffer[skip] > low)
-    ++skip;
-  skip += 8;
-
-  /* now do it again to find the end */
-  end= start;
-  for (i += 3; i < j - 4 ; ++i)
-  {
-    end += tmpbuff[i];
-    if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
-      if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
-        if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194)
-          if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130)
-          {
-            complete= true;
-            break;
-          }
-  }
-
-  if (start >= 0)
-    PrintAndLog("Found data at sample: %i",skip);
-  else
-  {
-    PrintAndLog("No data found!");
-    PrintAndLog("Try again with more samples.");
-    return 0;
-  }
-
-  if (!complete)
-  {
-    PrintAndLog("*** Warning!");
-    PrintAndLog("Partial data - no end found!");
-    PrintAndLog("Try again with more samples.");
-  }
-
-  /* get rid of leading crap */
-  sprintf(tmp,"%i",skip);
-  CmdLtrim(tmp);
-
-  /* now work through remaining buffer printing out data blocks */
-  block= 0;
-  i= startblock;
-  while (block < 6)
-  {
-    PrintAndLog("Block %i:", block);
-    // mandemod routine needs to be split so we can call it for data
-    // just print for now for debugging
-    CmdManchesterDemod("i 64");
-    skip= 0;
-    /* look for LW before start of next block */
-    for ( ; i < j - 4 ; ++i)
-    {
-      skip += tmpbuff[i];
-      if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
-        if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
-          break;
-    }
-    while (GraphBuffer[skip] > low)
-      ++skip;
-    skip += 8;
-    sprintf(tmp,"%i",skip);
-    CmdLtrim(tmp);
-    start += skip;
-    block++;
-  }
-  return 0;
+	CmdEM410xWatch(Cmd);
+	PrintAndLog("# Replaying captured ID: %s",global_em410xId);
+	CmdLFaskSim("");
+	return 0;
 }
 
 int CmdEM410xWrite(const char *Cmd)
 {
-  uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value
-  unsigned int card = 0xFF; // invalid card value
+	uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value
+	int card = 0xFF; // invalid card value
 	unsigned int clock = 0; // invalid clock value
 
 	sscanf(Cmd, "%" PRIx64 " %d %d", &id, &card, &clock);
@@ -471,133 +230,404 @@ int CmdEM410xWrite(const char *Cmd)
 		return 0;
 	}
 
-  UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}};
-  SendCommand(&c);
+	UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}};
+	SendCommand(&c);
+
+	return 0;
+}
+
+bool EM_EndParityTest(uint8_t *BitStream, size_t size, uint8_t rows, uint8_t cols, uint8_t pType)
+{
+	if (rows*cols>size) return false;
+	uint8_t colP=0;
+	//assume last col is a parity and do not test
+	for (uint8_t colNum = 0; colNum < cols-1; colNum++) {
+		for (uint8_t rowNum = 0; rowNum < rows; rowNum++) {
+			colP ^= BitStream[(rowNum*cols)+colNum];
+		}
+		if (colP != pType) return false;
+	}
+	return true;
+}
+
+bool EM_ByteParityTest(uint8_t *BitStream, size_t size, uint8_t rows, uint8_t cols, uint8_t pType)
+{
+	if (rows*cols>size) return false;
+	uint8_t rowP=0;
+	//assume last row is a parity row and do not test
+	for (uint8_t rowNum = 0; rowNum < rows-1; rowNum++) {
+		for (uint8_t colNum = 0; colNum < cols; colNum++) {
+			rowP ^= BitStream[(rowNum*cols)+colNum];
+		}
+		if (rowP != pType) return false;
+	}
+	return true;
+}
+
+uint32_t OutputEM4x50_Block(uint8_t *BitStream, size_t size, bool verbose, bool pTest)
+{
+	if (size<45) return 0;
+	uint32_t code = bytebits_to_byte(BitStream,8);
+	code = code<<8 | bytebits_to_byte(BitStream+9,8);
+	code = code<<8 | bytebits_to_byte(BitStream+18,8);
+	code = code<<8 | bytebits_to_byte(BitStream+27,8);
+	if (verbose || g_debugMode){
+		for (uint8_t i = 0; i<5; i++){
+			if (i == 4) PrintAndLog(""); //parity byte spacer
+			PrintAndLog("%d%d%d%d%d%d%d%d %d -> 0x%02x",
+			    BitStream[i*9],
+			    BitStream[i*9+1],
+			    BitStream[i*9+2],
+			    BitStream[i*9+3],
+			    BitStream[i*9+4],
+			    BitStream[i*9+5],
+			    BitStream[i*9+6],
+			    BitStream[i*9+7],
+			    BitStream[i*9+8],
+			    bytebits_to_byte(BitStream+i*9,8)
+			);
+		}
+		if (pTest)
+			PrintAndLog("Parity Passed");
+		else
+			PrintAndLog("Parity Failed");
+	}
+	return code;
+}
+/* Read the transmitted data of an EM4x50 tag
+ * Format:
+ *
+ *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
+ *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
+ *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
+ *  XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
+ *  CCCCCCCC                         <- column parity bits
+ *  0                                <- stop bit
+ *  LW                               <- Listen Window
+ *
+ * This pattern repeats for every block of data being transmitted.
+ * Transmission starts with two Listen Windows (LW - a modulated
+ * pattern of 320 cycles each (32/32/128/64/64)).
+ *
+ * Note that this data may or may not be the UID. It is whatever data
+ * is stored in the blocks defined in the control word First and Last
+ * Word Read values. UID is stored in block 32.
+ */
+ //completed by Marshmellow
+int EM4x50Read(const char *Cmd, bool verbose)
+{
+	uint8_t fndClk[] = {8,16,32,40,50,64,128};
+	int clk = 0; 
+	int invert = 0;
+	int tol = 0;
+	int i, j, startblock, skip, block, start, end, low, high, minClk;
+	bool complete = false;
+	int tmpbuff[MAX_GRAPH_TRACE_LEN / 64];
+	uint32_t Code[6];
+	char tmp[6];
+	char tmp2[20];
+	int phaseoff;
+	high = low = 0;
+	memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64);
+
+	// get user entry if any
+	sscanf(Cmd, "%i %i", &clk, &invert);
+	
+	// save GraphBuffer - to restore it later	
+	save_restoreGB(1);
+
+	// first get high and low values
+	for (i = 0; i < GraphTraceLen; i++) {
+		if (GraphBuffer[i] > high)
+			high = GraphBuffer[i];
+		else if (GraphBuffer[i] < low)
+			low = GraphBuffer[i];
+	}
 
-  return 0;
+	i = 0;
+	j = 0;
+	minClk = 255;
+	// get to first full low to prime loop and skip incomplete first pulse
+	while ((GraphBuffer[i] < high) && (i < GraphTraceLen))
+		++i;
+	while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
+		++i;
+	skip = i;
+
+	// populate tmpbuff buffer with pulse lengths
+	while (i < GraphTraceLen) {
+		// measure from low to low
+		while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
+			++i;
+		start= i;
+		while ((GraphBuffer[i] < high) && (i < GraphTraceLen))
+			++i;
+		while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
+			++i;
+		if (j>=(MAX_GRAPH_TRACE_LEN/64)) {
+			break;
+		}
+		tmpbuff[j++]= i - start;
+		if (i-start < minClk && i < GraphTraceLen) {
+			minClk = i - start;
+		}
+	}
+	// set clock
+	if (!clk) {
+		for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++) {
+			tol = fndClk[clkCnt]/8;
+			if (minClk >= fndClk[clkCnt]-tol && minClk <= fndClk[clkCnt]+1) { 
+				clk=fndClk[clkCnt];
+				break;
+			}
+		}
+		if (!clk) return 0;
+	} else tol = clk/8;
+
+	// look for data start - should be 2 pairs of LW (pulses of clk*3,clk*2)
+	start = -1;
+	for (i= 0; i < j - 4 ; ++i) {
+		skip += tmpbuff[i];
+		if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol)  //3 clocks
+			if (tmpbuff[i+1] >= clk*2-tol && tmpbuff[i+1] <= clk*2+tol)  //2 clocks
+				if (tmpbuff[i+2] >= clk*3-tol && tmpbuff[i+2] <= clk*3+tol) //3 clocks
+					if (tmpbuff[i+3] >= clk-tol)  //1.5 to 2 clocks - depends on bit following
+					{
+						start= i + 4;
+						break;
+					}
+	}
+	startblock = i + 4;
+
+	// skip over the remainder of LW
+	skip += tmpbuff[i+1] + tmpbuff[i+2] + clk;
+	if (tmpbuff[i+3]>clk) 
+		phaseoff = tmpbuff[i+3]-clk;
+	else
+		phaseoff = 0;
+	// now do it again to find the end
+	end = skip;
+	for (i += 3; i < j - 4 ; ++i) {
+		end += tmpbuff[i];
+		if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol)  //3 clocks
+			if (tmpbuff[i+1] >= clk*2-tol && tmpbuff[i+1] <= clk*2+tol)  //2 clocks
+				if (tmpbuff[i+2] >= clk*3-tol && tmpbuff[i+2] <= clk*3+tol) //3 clocks
+					if (tmpbuff[i+3] >= clk-tol)  //1.5 to 2 clocks - depends on bit following
+					{
+						complete= true;
+						break;
+					}
+	}
+	end = i;
+	// report back
+	if (verbose || g_debugMode) {
+		if (start >= 0) {
+			PrintAndLog("\nNote: one block = 50 bits (32 data, 12 parity, 6 marker)");
+		}	else {
+			PrintAndLog("No data found!, clock tried:%d",clk);
+			PrintAndLog("Try again with more samples.");
+			PrintAndLog("  or after a 'data askedge' command to clean up the read");
+			return 0;
+		}
+	} else if (start < 0) return 0;
+	start = skip;
+	snprintf(tmp2, sizeof(tmp2),"%d %d 1000 %d", clk, invert, clk*47);
+	// get rid of leading crap 
+	snprintf(tmp, sizeof(tmp), "%i", skip);
+	CmdLtrim(tmp);
+	bool pTest;
+	bool AllPTest = true;
+	// now work through remaining buffer printing out data blocks
+	block = 0;
+	i = startblock;
+	while (block < 6) {
+		if (verbose || g_debugMode) PrintAndLog("\nBlock %i:", block);
+		skip = phaseoff;
+		
+		// look for LW before start of next block
+		for ( ; i < j - 4 ; ++i) {
+			skip += tmpbuff[i];
+			if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol)
+				if (tmpbuff[i+1] >= clk-tol)
+					break;
+		}
+		if (i >= j-4) break; //next LW not found
+		skip += clk;
+		if (tmpbuff[i+1]>clk)
+			phaseoff = tmpbuff[i+1]-clk;
+		else
+			phaseoff = 0;
+		i += 2;
+		if (ASKDemod(tmp2, false, false, 1) < 1) {
+			save_restoreGB(0);
+			return 0;
+		}
+		//set DemodBufferLen to just one block
+		DemodBufferLen = skip/clk;
+		//test parities
+		pTest = EM_ByteParityTest(DemodBuffer,DemodBufferLen,5,9,0);	
+		pTest &= EM_EndParityTest(DemodBuffer,DemodBufferLen,5,9,0);
+		AllPTest &= pTest;
+		//get output
+		Code[block] = OutputEM4x50_Block(DemodBuffer,DemodBufferLen,verbose, pTest);
+		if (g_debugMode) PrintAndLog("\nskipping %d samples, bits:%d", skip, skip/clk);
+		//skip to start of next block
+		snprintf(tmp,sizeof(tmp),"%i",skip);
+		CmdLtrim(tmp);
+		block++;
+		if (i >= end) break; //in case chip doesn't output 6 blocks
+	}
+	//print full code:
+	if (verbose || g_debugMode || AllPTest){
+		if (!complete) {
+			PrintAndLog("*** Warning!");
+			PrintAndLog("Partial data - no end found!");
+			PrintAndLog("Try again with more samples.");
+		}
+		PrintAndLog("Found data at sample: %i - using clock: %i", start, clk);    
+		end = block;
+		for (block=0; block < end; block++){
+			PrintAndLog("Block %d: %08x",block,Code[block]);
+		}
+		if (AllPTest) {
+			PrintAndLog("Parities Passed");
+		} else {
+			PrintAndLog("Parities Failed");
+			PrintAndLog("Try cleaning the read samples with 'data askedge'");
+		}
+	}
+
+	//restore GraphBuffer
+	save_restoreGB(0);
+	return (int)AllPTest;
+}
+
+int CmdEM4x50Read(const char *Cmd)
+{
+	return EM4x50Read(Cmd, true);
 }
 
 int CmdReadWord(const char *Cmd)
 {
-  int Word = 16; //default to invalid word
-  UsbCommand c;
-  
-  sscanf(Cmd, "%d", &Word);
-  
-  if (Word > 15) {
-    PrintAndLog("Word must be between 0 and 15");
-    return 1;
-  }
-  
-  PrintAndLog("Reading word %d", Word);
-  
-  c.cmd = CMD_EM4X_READ_WORD;
-  c.d.asBytes[0] = 0x0; //Normal mode
-  c.arg[0] = 0;
-  c.arg[1] = Word;
-  c.arg[2] = 0;
-  SendCommand(&c);
-  return 0;
+	int Word = -1; //default to invalid word
+	UsbCommand c;
+	
+	sscanf(Cmd, "%d", &Word);
+	
+	if ( (Word > 15) | (Word < 0) ) {
+		PrintAndLog("Word must be between 0 and 15");
+		return 1;
+	}
+	
+	PrintAndLog("Reading word %d", Word);
+	
+	c.cmd = CMD_EM4X_READ_WORD;
+	c.d.asBytes[0] = 0x0; //Normal mode
+	c.arg[0] = 0;
+	c.arg[1] = Word;
+	c.arg[2] = 0;
+	SendCommand(&c);
+	return 0;
 }
 
 int CmdReadWordPWD(const char *Cmd)
 {
-  int Word = 16; //default to invalid word
-  int Password = 0xFFFFFFFF; //default to blank password
-  UsbCommand c;
-  
-  sscanf(Cmd, "%d %x", &Word, &Password);
-  
-  if (Word > 15) {
-    PrintAndLog("Word must be between 0 and 15");
-    return 1;
-  }
-  
-  PrintAndLog("Reading word %d with password %08X", Word, Password);
-  
-  c.cmd = CMD_EM4X_READ_WORD;
-  c.d.asBytes[0] = 0x1; //Password mode
-  c.arg[0] = 0;
-  c.arg[1] = Word;
-  c.arg[2] = Password;
-  SendCommand(&c);
-  return 0;
+	int Word = -1; //default to invalid word
+	int Password = 0xFFFFFFFF; //default to blank password
+	UsbCommand c;
+	
+	sscanf(Cmd, "%d %x", &Word, &Password);
+	
+	if ( (Word > 15) | (Word < 0) ) {
+		PrintAndLog("Word must be between 0 and 15");
+		return 1;
+	}
+	
+	PrintAndLog("Reading word %d with password %08X", Word, Password);
+	
+	c.cmd = CMD_EM4X_READ_WORD;
+	c.d.asBytes[0] = 0x1; //Password mode
+	c.arg[0] = 0;
+	c.arg[1] = Word;
+	c.arg[2] = Password;
+	SendCommand(&c);
+	return 0;
 }
 
 int CmdWriteWord(const char *Cmd)
 {
-  int Word = 16; //default to invalid block
-  int Data = 0xFFFFFFFF; //default to blank data
-  UsbCommand c;
-  
-  sscanf(Cmd, "%x %d", &Data, &Word);
-  
-  if (Word > 15) {
-    PrintAndLog("Word must be between 0 and 15");
-    return 1;
-  }
-  
-  PrintAndLog("Writting word %d with data %08X", Word, Data);
-  
-  c.cmd = CMD_EM4X_WRITE_WORD;
-  c.d.asBytes[0] = 0x0; //Normal mode
-  c.arg[0] = Data;
-  c.arg[1] = Word;
-  c.arg[2] = 0;
-  SendCommand(&c);
-  return 0;
+	int Word = 16; //default to invalid block
+	int Data = 0xFFFFFFFF; //default to blank data
+	UsbCommand c;
+	
+	sscanf(Cmd, "%x %d", &Data, &Word);
+	
+	if (Word > 15) {
+		PrintAndLog("Word must be between 0 and 15");
+		return 1;
+	}
+	
+	PrintAndLog("Writing word %d with data %08X", Word, Data);
+	
+	c.cmd = CMD_EM4X_WRITE_WORD;
+	c.d.asBytes[0] = 0x0; //Normal mode
+	c.arg[0] = Data;
+	c.arg[1] = Word;
+	c.arg[2] = 0;
+	SendCommand(&c);
+	return 0;
 }
 
 int CmdWriteWordPWD(const char *Cmd)
 {
-  int Word = 8; //default to invalid word
-  int Data = 0xFFFFFFFF; //default to blank data
-  int Password = 0xFFFFFFFF; //default to blank password
-  UsbCommand c;
-  
-  sscanf(Cmd, "%x %d %x", &Data, &Word, &Password);
-  
-  if (Word > 15) {
-    PrintAndLog("Word must be between 0 and 15");
-    return 1;
-  }
-  
-  PrintAndLog("Writting word %d with data %08X and password %08X", Word, Data, Password);
-  
-  c.cmd = CMD_EM4X_WRITE_WORD;
-  c.d.asBytes[0] = 0x1; //Password mode
-  c.arg[0] = Data;
-  c.arg[1] = Word;
-  c.arg[2] = Password;
-  SendCommand(&c);
-  return 0;
+	int Word = 16; //default to invalid word
+	int Data = 0xFFFFFFFF; //default to blank data
+	int Password = 0xFFFFFFFF; //default to blank password
+	UsbCommand c;
+	
+	sscanf(Cmd, "%x %d %x", &Data, &Word, &Password);
+	
+	if (Word > 15) {
+		PrintAndLog("Word must be between 0 and 15");
+		return 1;
+	}
+	
+	PrintAndLog("Writing word %d with data %08X and password %08X", Word, Data, Password);
+	
+	c.cmd = CMD_EM4X_WRITE_WORD;
+	c.d.asBytes[0] = 0x1; //Password mode
+	c.arg[0] = Data;
+	c.arg[1] = Word;
+	c.arg[2] = Password;
+	SendCommand(&c);
+	return 0;
 }
 
-
-
 static command_t CommandTable[] =
 {
-  {"help", CmdHelp, 1, "This help"},
-  {"em410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag"},
-  {"em410xsim", CmdEM410xSim, 0, "<UID> -- Simulate EM410x tag"},
-  {"em410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"},
-  {"em410xwrite", CmdEM410xWrite, 1, "<UID> <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"},
-  {"em4x50read", CmdEM4x50Read, 1, "Extract data from EM4x50 tag"},
-  {"readword", CmdReadWord, 1, "<Word> -- Read EM4xxx word data"},
-  {"readwordPWD", CmdReadWordPWD, 1, "<Word> <Password> -- Read EM4xxx word data in password mode"},
-  {"writeword", CmdWriteWord, 1, "<Data> <Word> -- Write EM4xxx word data"},
-  {"writewordPWD", CmdWriteWordPWD, 1, "<Data> <Word> <Password> -- Write EM4xxx word data in password mode"},
-  {NULL, NULL, 0, NULL}
+	{"help", CmdHelp, 1, "This help"},
+	{"em410xdemod", CmdEMdemodASK, 0, "[findone] -- Extract ID from EM410x tag (option 0 for continuous loop, 1 for only 1 tag)"},  
+	{"em410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag in GraphBuffer"},
+	{"em410xsim", CmdEM410xSim, 0, "<UID> -- Simulate EM410x tag"},
+	{"em410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"},
+	{"em410xspoof", CmdEM410xWatchnSpoof, 0, "['h'] --- Watches for EM410x 125/134 kHz tags, and replays them. (option 'h' for 134)" },
+	{"em410xwrite", CmdEM410xWrite, 0, "<UID> <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"},
+	{"em4x50read", CmdEM4x50Read, 1, "Extract data from EM4x50 tag"},
+	{"readword", CmdReadWord, 1, "<Word> -- Read EM4xxx word data"},
+	{"readwordPWD", CmdReadWordPWD, 1, "<Word> <Password> -- Read EM4xxx word data in password mode"},
+	{"writeword", CmdWriteWord, 1, "<Data> <Word> -- Write EM4xxx word data"},
+	{"writewordPWD", CmdWriteWordPWD, 1, "<Data> <Word> <Password> -- Write EM4xxx word data in password mode"},
+	{NULL, NULL, 0, NULL}
 };
 
 int CmdLFEM4X(const char *Cmd)
 {
-  CmdsParse(CommandTable, Cmd);
-  return 0;
+	CmdsParse(CommandTable, Cmd);
+	return 0;
 }
 
 int CmdHelp(const char *Cmd)
 {
-  CmdsHelp(CommandTable);
-  return 0;
+	CmdsHelp(CommandTable);
+	return 0;
 }