[proxmark3-svn] / client / cmdlfem4x.c

//-----------------------------------------------------------------------------
// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Low frequency EM4x commands
//-----------------------------------------------------------------------------

#include <stdio.h>
#include <string.h>
#include <inttypes.h>
//#include "proxusb.h"
#include "proxmark3.h"
#include "ui.h"
#include "graph.h"
#include "cmdparser.h"
#include "cmddata.h"
#include "cmdlf.h"
#include "cmdlfem4x.h"

static int CmdHelp(const char *Cmd);

/* Read the ID of 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
 */
int CmdEM410xRead(const char *Cmd)
{
  int i, j, clock, header, rows, bit, hithigh, hitlow, first, bit2idx, high, low;
  int parity[4];
  char id[11];
  char id2[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]));
        sprintf(id2+rows, "%x", (8 * BitStream[i+3]) + (4 * BitStream[i+2]) + (2 * BitStream[i+1]) + (1 * BitStream[i]));
        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);
        PrintAndLog("Unique Tag ID: %s", id2);

        /* 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;
}

/* 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
 */
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;
}

/* Function is equivalent of loread + losamples + em410xread
 * looped until an EM410x tag is detected */
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;
}

/* 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)
{
  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;
}

int CmdEM410xWrite(const char *Cmd)
{
  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);

	// Check ID
	if (id == 0xFFFFFFFFFFFFFFFF) {
		PrintAndLog("Error! ID is required.\n");
		return 0;
	}
	if (id >= 0x10000000000) {
		PrintAndLog("Error! Given EM410x ID is longer than 40 bits.\n");
		return 0;
	}

	// Check Card
	if (card == 0xFF) {
		PrintAndLog("Error! Card type required.\n");
		return 0;
	}
	if (card < 0) {
		PrintAndLog("Error! Bad card type selected.\n");
		return 0;
	}

	// Check Clock
	if (card == 1)
	{
		// Default: 64
		if (clock == 0)
			clock = 64;

		// Allowed clock rates: 16, 32 and 64
		if ((clock != 16) && (clock != 32) && (clock != 64)) {
			PrintAndLog("Error! Clock rate %d not valid. Supported clock rates are 16, 32 and 64.\n", clock);
			return 0;
		}
	}
	else if (clock != 0)
	{
		PrintAndLog("Error! Clock rate is only supported on T55x7 tags.\n");
		return 0;
	}

	if (card == 1) {
		PrintAndLog("Writing %s tag with UID 0x%010" PRIx64 " (clock rate: %d)", "T55x7", id, clock);
		// NOTE: We really should pass the clock in as a separate argument, but to
		//   provide for backwards-compatibility for older firmware, and to avoid
		//   having to add another argument to CMD_EM410X_WRITE_TAG, we just store
		//   the clock rate in bits 8-15 of the card value
		card = (card & 0xFF) | (((uint64_t)clock << 8) & 0xFF00);
	}
	else if (card == 0)
		PrintAndLog("Writing %s tag with UID 0x%010" PRIx64, "T5555", id, clock);
	else {
		PrintAndLog("Error! Bad card type selected.\n");
		return 0;
	}

  UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}};
  SendCommand(&c);

  return 0;
}

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 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 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 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;
}


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}
};

int CmdLFEM4X(const char *Cmd)
{
  CmdsParse(CommandTable, Cmd);
  return 0;
}

int CmdHelp(const char *Cmd)
{
  CmdsHelp(CommandTable);
  return 0;
}
Commit	Line	Data
a553f267	1	//-----------------------------------------------------------------------------
	2	// Copyright (C) 2010 iZsh <izsh at fail0verflow.com>
	3	//
	4	// This code is licensed to you under the terms of the GNU GPL, version 2 or,
	5	// at your option, any later version. See the LICENSE.txt file for the text of
	6	// the license.
	7	//-----------------------------------------------------------------------------
	8	// Low frequency EM4x commands
	9	//-----------------------------------------------------------------------------
	10
7fe9b0b7	11	#include <stdio.h>
9e13f875	12	#include <string.h>
ec564290	13	#include <inttypes.h>
28fdb04f	14	//#include "proxusb.h"
902cb3c0	15	#include "proxmark3.h"
7fe9b0b7	16	#include "ui.h"
	17	#include "graph.h"
	18	#include "cmdparser.h"
	19	#include "cmddata.h"
	20	#include "cmdlf.h"
	21	#include "cmdlfem4x.h"
	22
	23	static int CmdHelp(const char *Cmd);
	24
	25	/* Read the ID of an EM410x tag.
	26	* Format:
	27	* 1111 1111 1 <-- standard non-repeatable header
	28	* XXXX [row parity bit] <-- 10 rows of 5 bits for our 40 bit tag ID
	29	* ....
	30	* CCCC <-- each bit here is parity for the 10 bits above in corresponding column
	31	* 0 <-- stop bit, end of tag
	32	*/
	33	int CmdEM410xRead(const char *Cmd)
	34	{
	35	int i, j, clock, header, rows, bit, hithigh, hitlow, first, bit2idx, high, low;
	36	int parity[4];
	37	char id[11];
080ff30a	38	char id2[11];
7fe9b0b7	39	int retested = 0;
15cdabd4	40	uint8_t BitStream[MAX_GRAPH_TRACE_LEN];
7fe9b0b7	41	high = low = 0;
	42
	43	/* Detect high and lows and clock */
	44	for (i = 0; i < GraphTraceLen; i++)
	45	{
	46	if (GraphBuffer[i] > high)
	47	high = GraphBuffer[i];
	48	else if (GraphBuffer[i] < low)
	49	low = GraphBuffer[i];
	50	}
	51
	52	/* get clock */
	53	clock = GetClock(Cmd, high, 0);
	54
	55	/* parity for our 4 columns */
	56	parity[0] = parity[1] = parity[2] = parity[3] = 0;
	57	header = rows = 0;
	58
	59	/* manchester demodulate */
	60	bit = bit2idx = 0;
	61	for (i = 0; i < (int)(GraphTraceLen / clock); i++)
	62	{
	63	hithigh = 0;
	64	hitlow = 0;
	65	first = 1;
	66
	67	/* Find out if we hit both high and low peaks */
	68	for (j = 0; j < clock; j++)
	69	{
	70	if (GraphBuffer[(i * clock) + j] == high)
	71	hithigh = 1;
	72	else if (GraphBuffer[(i * clock) + j] == low)
	73	hitlow = 1;
	74
	75	/* it doesn't count if it's the first part of our read
	76	because it's really just trailing from the last sequence */
	77	if (first && (hithigh \|\| hitlow))
	78	hithigh = hitlow = 0;
	79	else
	80	first = 0;
	81
	82	if (hithigh && hitlow)
	83	break;
	84	}
	85
	86	/* If we didn't hit both high and low peaks, we had a bit transition */
	87	if (!hithigh \|\| !hitlow)
	88	bit ^= 1;
	89
	90	BitStream[bit2idx++] = bit;
	91	}
	92
	93	retest:
	94	/* We go till 5 before the graph ends because we'll get that far below */
	95	for (i = 1; i < bit2idx - 5; i++)
	96	{
	97	/* Step 2: We have our header but need our tag ID */
	98	if (header == 9 && rows < 10)
	99	{
	100	/* Confirm parity is correct */
	101	if ((BitStream[i] ^ BitStream[i+1] ^ BitStream[i+2] ^ BitStream[i+3]) == BitStream[i+4])
	102	{
	103	/* Read another byte! */
	104	sprintf(id+rows, "%x", (8 * BitStream[i]) + (4 * BitStream[i+1]) + (2 * BitStream[i+2]) + (1 * BitStream[i+3]));
cb967ea9	105	sprintf(id2+rows, "%x", (8 * BitStream[i+3]) + (4 * BitStream[i+2]) + (2 * BitStream[i+1]) + (1 * BitStream[i]));
7fe9b0b7	106	rows++;
	107
	108	/* Keep parity info */
	109	parity[0] ^= BitStream[i];
	110	parity[1] ^= BitStream[i+1];
	111	parity[2] ^= BitStream[i+2];
	112	parity[3] ^= BitStream[i+3];
	113
	114	/* Move 4 bits ahead */
	115	i += 4;
	116	}
	117
	118	/* Damn, something wrong! reset */
	119	else
	120	{
	121	PrintAndLog("Thought we had a valid tag but failed at word %d (i=%d)", rows + 1, i);
	122
	123	/* Start back rows * 5 + 9 header bits, -1 to not start at same place */
	124	i -= 9 + (5 * rows) - 5;
	125
	126	rows = header = 0;
	127	}
	128	}
	129
	130	/* Step 3: Got our 40 bits! confirm column parity */
	131	else if (rows == 10)
	132	{
	133	/* We need to make sure our 4 bits of parity are correct and we have a stop bit */
	134	if (BitStream[i] == parity[0] && BitStream[i+1] == parity[1] &&
	135	BitStream[i+2] == parity[2] && BitStream[i+3] == parity[3] &&
	136	BitStream[i+4] == 0)
	137	{
	138	/* Sweet! */
	139	PrintAndLog("EM410x Tag ID: %s", id);
cb967ea9	140	PrintAndLog("Unique Tag ID: %s", id2);
7fe9b0b7	141
	142	/* Stop any loops */
	143	return 1;
	144	}
	145
	146	/* Crap! Incorrect parity or no stop bit, start all over */
	147	else
	148	{
	149	rows = header = 0;
	150
	151	/* Go back 59 bits (9 header bits + 10 rows at 4+1 parity) */
	152	i -= 59;
	153	}
	154	}
	155
	156	/* Step 1: get our header */
	157	else if (header < 9)
	158	{
	159	/* Need 9 consecutive 1's */
	160	if (BitStream[i] == 1)
	161	header++;
	162
	163	/* We don't have a header, not enough consecutive 1 bits */
	164	else
	165	header = 0;
	166	}
	167	}
	168
	169	/* if we've already retested after flipping bits, return */
	170	if (retested++)
	171	return 0;
	172
	173	/* if this didn't work, try flipping bits */
	174	for (i = 0; i < bit2idx; i++)
	175	BitStream[i] ^= 1;
	176
	177	goto retest;
	178	}
	179
	180	/* emulate an EM410X tag
	181	* Format:
	182	* 1111 1111 1 <-- standard non-repeatable header
	183	* XXXX [row parity bit] <-- 10 rows of 5 bits for our 40 bit tag ID
	184	* ....
	185	* CCCC <-- each bit here is parity for the 10 bits above in corresponding column
	186	* 0 <-- stop bit, end of tag
	187	*/
	188	int CmdEM410xSim(const char *Cmd)
	189	{
	190	int i, n, j, h, binary[4], parity[4];
	191
	192	/* clock is 64 in EM410x tags */
	193	int clock = 64;
	194
	195	/* clear our graph */
	196	ClearGraph(0);
	197
	198	/* write it out a few times */
	199	for (h = 0; h < 4; h++)
	200	{
	201	/* write 9 start bits */
	202	for (i = 0; i < 9; i++)
	203	AppendGraph(0, clock, 1);
	204
205	/* for each hex char */
206	parity[0] = parity[1] = parity[2] = parity[3] = 0;
207	for (i = 0; i < 10; i++)
208	{
209	/* read each hex char */
210	sscanf(&Cmd[i], "%1x", &n);
211	for (j = 3; j >= 0; j--, n/= 2)
212	binary[j] = n % 2;
213
214	/* append each bit */
215	AppendGraph(0, clock, binary[0]);
216	AppendGraph(0, clock, binary[1]);
217	AppendGraph(0, clock, binary[2]);
218	AppendGraph(0, clock, binary[3]);
219
220	/* append parity bit */
221	AppendGraph(0, clock, binary[0] ^ binary[1] ^ binary[2] ^ binary[3]);
222
223	/* keep track of column parity */
224	parity[0] ^= binary[0];
225	parity[1] ^= binary[1];
226	parity[2] ^= binary[2];
227	parity[3] ^= binary[3];
228	}
229
230	/* parity columns */
231	AppendGraph(0, clock, parity[0]);
232	AppendGraph(0, clock, parity[1]);
233	AppendGraph(0, clock, parity[2]);
234	AppendGraph(0, clock, parity[3]);
235
236	/* stop bit */
237	AppendGraph(0, clock, 0);
238	}
239
240	/* modulate that biatch */
241	CmdManchesterMod("");
242
243	/* booyah! */
244	RepaintGraphWindow();
245
246	CmdLFSim("");
247	return 0;
248	}
249
250	/* Function is equivalent of loread + losamples + em410xread
251	* looped until an EM410x tag is detected */
252	int CmdEM410xWatch(const char *Cmd)
253	{
e67b06b7	254	int read_h = (*Cmd == 'h');
7fe9b0b7	255	do
7fe9b0b7	256	{
e67b06b7	257	CmdLFRead(read_h ? "h" : "");
	258	// 2000 samples is OK for clock=64, but not clock=32. Probably want
	259	// 8000 for clock=16. Don't want to go too high since old HID driver
	260	// is very slow
	261	// TBD: Auto-grow sample size based on detected sample rate. IE: If the
	262	// rate gets lower, then grow the number of samples
489e1745	263
	264	// Changed by martin, 4000 x 4 = 16000,
	265	// see http://www.proxmark.org/forum/viewtopic.php?pid=7235#p7235
	266	CmdSamples("16000");
	267	} while ( ! CmdEM410xRead(""));
7fe9b0b7	268	return 0;
	269	}
	270
	271	/* Read the transmitted data of an EM4x50 tag
	272	* Format:
	273	*
	274	* XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
	275	* XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
	276	* XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
	277	* XXXXXXXX [row parity bit (even)] <- 8 bits plus parity
	278	* CCCCCCCC <- column parity bits
	279	* 0 <- stop bit
	280	* LW <- Listen Window
	281	*
	282	* This pattern repeats for every block of data being transmitted.
	283	* Transmission starts with two Listen Windows (LW - a modulated
	284	* pattern of 320 cycles each (32/32/128/64/64)).
	285	*
	286	* Note that this data may or may not be the UID. It is whatever data
	287	* is stored in the blocks defined in the control word First and Last
	288	* Word Read values. UID is stored in block 32.
	289	*/
	290	int CmdEM4x50Read(const char *Cmd)
	291	{
31b6e9af	292	int i, j, startblock, skip, block, start, end, low, high;
7fe9b0b7	293	bool complete= false;
	294	int tmpbuff[MAX_GRAPH_TRACE_LEN / 64];
	295	char tmp[6];
	296
	297	high= low= 0;
913d23c6	298	memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64);
7fe9b0b7	299
	300	/* first get high and low values */
	301	for (i = 0; i < GraphTraceLen; i++)
	302	{
	303	if (GraphBuffer[i] > high)
	304	high = GraphBuffer[i];
	305	else if (GraphBuffer[i] < low)
	306	low = GraphBuffer[i];
	307	}
	308
	309	/* populate a buffer with pulse lengths */
	310	i= 0;
	311	j= 0;
	312	while (i < GraphTraceLen)
	313	{
	314	// measure from low to low
	315	while ((GraphBuffer[i] > low) && (i<GraphTraceLen))
	316	++i;
	317	start= i;
	318	while ((GraphBuffer[i] < high) && (i<GraphTraceLen))
	319	++i;
	320	while ((GraphBuffer[i] > low) && (i<GraphTraceLen))
	321	++i;
	322	if (j>(MAX_GRAPH_TRACE_LEN/64)) {
	323	break;
	324	}
	325	tmpbuff[j++]= i - start;
	326	}
	327
	328	/* look for data start - should be 2 pairs of LW (pulses of 192,128) */
	329	start= -1;
	330	skip= 0;
	331	for (i= 0; i < j - 4 ; ++i)
	332	{
	333	skip += tmpbuff[i];
	334	if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
	335	if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
	336	if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194)
	337	if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130)
	338	{
	339	start= i + 3;
	340	break;
	341	}
	342	}
	343	startblock= i + 3;
	344
	345	/* skip over the remainder of the LW */
	346	skip += tmpbuff[i+1]+tmpbuff[i+2];
	347	while (skip < MAX_GRAPH_TRACE_LEN && GraphBuffer[skip] > low)
	348	++skip;
	349	skip += 8;
	350
	351	/* now do it again to find the end */
	352	end= start;
	353	for (i += 3; i < j - 4 ; ++i)
	354	{
	355	end += tmpbuff[i];
	356	if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
	357	if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
	358	if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194)
	359	if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130)
	360	{
	361	complete= true;
	362	break;
363	}
364	}
365
366	if (start >= 0)
367	PrintAndLog("Found data at sample: %i",skip);
368	else
369	{
370	PrintAndLog("No data found!");
371	PrintAndLog("Try again with more samples.");
372	return 0;
373	}
374
375	if (!complete)
376	{
377	PrintAndLog("*** Warning!");
378	PrintAndLog("Partial data - no end found!");
379	PrintAndLog("Try again with more samples.");
380	}
381
382	/* get rid of leading crap */
383	sprintf(tmp,"%i",skip);
384	CmdLtrim(tmp);
385
386	/* now work through remaining buffer printing out data blocks */
387	block= 0;
388	i= startblock;
389	while (block < 6)
390	{
391	PrintAndLog("Block %i:", block);
392	// mandemod routine needs to be split so we can call it for data
393	// just print for now for debugging
394	CmdManchesterDemod("i 64");
395	skip= 0;
396	/* look for LW before start of next block */
397	for ( ; i < j - 4 ; ++i)
398	{
399	skip += tmpbuff[i];
400	if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194)
401	if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130)
402	break;
403	}
404	while (GraphBuffer[skip] > low)
405	++skip;
406	skip += 8;
407	sprintf(tmp,"%i",skip);
408	CmdLtrim(tmp);
409	start += skip;
410	block++;
411	}
412	return 0;
413	}
414
2d4eae76	415	int CmdEM410xWrite(const char *Cmd)
2d4eae76	416	{
e67b06b7	417	uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value
7bb9d33e	418	int card = 0xFF; // invalid card value
e67b06b7	419	unsigned int clock = 0; // invalid clock value
	420
	421	sscanf(Cmd, "%" PRIx64 " %d %d", &id, &card, &clock);
	422
	423	// Check ID
	424	if (id == 0xFFFFFFFFFFFFFFFF) {
	425	PrintAndLog("Error! ID is required.\n");
	426	return 0;
	427	}
	428	if (id >= 0x10000000000) {
	429	PrintAndLog("Error! Given EM410x ID is longer than 40 bits.\n");
	430	return 0;
	431	}
	432
	433	// Check Card
	434	if (card == 0xFF) {
	435	PrintAndLog("Error! Card type required.\n");
	436	return 0;
	437	}
	438	if (card < 0) {
	439	PrintAndLog("Error! Bad card type selected.\n");
	440	return 0;
	441	}
	442
	443	// Check Clock
	444	if (card == 1)
	445	{
	446	// Default: 64
	447	if (clock == 0)
	448	clock = 64;
	449
	450	// Allowed clock rates: 16, 32 and 64
	451	if ((clock != 16) && (clock != 32) && (clock != 64)) {
	452	PrintAndLog("Error! Clock rate %d not valid. Supported clock rates are 16, 32 and 64.\n", clock);
	453	return 0;
	454	}
	455	}
	456	else if (clock != 0)
	457	{
	458	PrintAndLog("Error! Clock rate is only supported on T55x7 tags.\n");
	459	return 0;
	460	}
	461
	462	if (card == 1) {
	463	PrintAndLog("Writing %s tag with UID 0x%010" PRIx64 " (clock rate: %d)", "T55x7", id, clock);
	464	// NOTE: We really should pass the clock in as a separate argument, but to
	465	// provide for backwards-compatibility for older firmware, and to avoid
	466	// having to add another argument to CMD_EM410X_WRITE_TAG, we just store
	467	// the clock rate in bits 8-15 of the card value
	468	card = (card & 0xFF) \| (((uint64_t)clock << 8) & 0xFF00);
	469	}
	470	else if (card == 0)
	471	PrintAndLog("Writing %s tag with UID 0x%010" PRIx64, "T5555", id, clock);
	472	else {
	473	PrintAndLog("Error! Bad card type selected.\n");
	474	return 0;
	475	}
2d4eae76	476
2d4eae76	477	UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}};
	478	SendCommand(&c);
	479
	480	return 0;
	481	}
	482
54a942b0	483	int CmdReadWord(const char *Cmd)
	484	{
	485	int Word = 16; //default to invalid word
	486	UsbCommand c;
	487
	488	sscanf(Cmd, "%d", &Word);
	489
	490	if (Word > 15) {
	491	PrintAndLog("Word must be between 0 and 15");
	492	return 1;
	493	}
	494
	495	PrintAndLog("Reading word %d", Word);
	496
	497	c.cmd = CMD_EM4X_READ_WORD;
	498	c.d.asBytes[0] = 0x0; //Normal mode
	499	c.arg[0] = 0;
	500	c.arg[1] = Word;
	501	c.arg[2] = 0;
	502	SendCommand(&c);
	503	return 0;
	504	}
	505
	506	int CmdReadWordPWD(const char *Cmd)
	507	{
	508	int Word = 16; //default to invalid word
	509	int Password = 0xFFFFFFFF; //default to blank password
	510	UsbCommand c;
	511
	512	sscanf(Cmd, "%d %x", &Word, &Password);
	513
	514	if (Word > 15) {
	515	PrintAndLog("Word must be between 0 and 15");
	516	return 1;
	517	}
	518
	519	PrintAndLog("Reading word %d with password %08X", Word, Password);
	520
	521	c.cmd = CMD_EM4X_READ_WORD;
	522	c.d.asBytes[0] = 0x1; //Password mode
	523	c.arg[0] = 0;
	524	c.arg[1] = Word;
	525	c.arg[2] = Password;
	526	SendCommand(&c);
	527	return 0;
	528	}
	529
	530	int CmdWriteWord(const char *Cmd)
	531	{
	532	int Word = 16; //default to invalid block
	533	int Data = 0xFFFFFFFF; //default to blank data
	534	UsbCommand c;
	535
	536	sscanf(Cmd, "%x %d", &Data, &Word);
	537
	538	if (Word > 15) {
	539	PrintAndLog("Word must be between 0 and 15");
	540	return 1;
	541	}
	542
	543	PrintAndLog("Writting word %d with data %08X", Word, Data);
	544
	545	c.cmd = CMD_EM4X_WRITE_WORD;
	546	c.d.asBytes[0] = 0x0; //Normal mode
547	c.arg[0] = Data;
548	c.arg[1] = Word;
549	c.arg[2] = 0;
550	SendCommand(&c);
551	return 0;
552	}
553
554	int CmdWriteWordPWD(const char *Cmd)
555	{
556	int Word = 8; //default to invalid word
557	int Data = 0xFFFFFFFF; //default to blank data
558	int Password = 0xFFFFFFFF; //default to blank password
559	UsbCommand c;
560
561	sscanf(Cmd, "%x %d %x", &Data, &Word, &Password);
562
563	if (Word > 15) {
564	PrintAndLog("Word must be between 0 and 15");
565	return 1;
566	}
567
568	PrintAndLog("Writting word %d with data %08X and password %08X", Word, Data, Password);
569
570	c.cmd = CMD_EM4X_WRITE_WORD;
571	c.d.asBytes[0] = 0x1; //Password mode
572	c.arg[0] = Data;
573	c.arg[1] = Word;
574	c.arg[2] = Password;
575	SendCommand(&c);
576	return 0;
577	}
578
579
580
2d4eae76	581	static command_t CommandTable[] =
7fe9b0b7	582	{
54a942b0	583	{"help", CmdHelp, 1, "This help"},
	584	{"em410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag"},
	585	{"em410xsim", CmdEM410xSim, 0, "<UID> -- Simulate EM410x tag"},
e67b06b7	586	{"em410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"},
e67b06b7	587	{"em410xwrite", CmdEM410xWrite, 1, "<UID> <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"},
54a942b0	588	{"em4x50read", CmdEM4x50Read, 1, "Extract data from EM4x50 tag"},
	589	{"readword", CmdReadWord, 1, "<Word> -- Read EM4xxx word data"},
	590	{"readwordPWD", CmdReadWordPWD, 1, "<Word> <Password> -- Read EM4xxx word data in password mode"},
	591	{"writeword", CmdWriteWord, 1, "<Data> <Word> -- Write EM4xxx word data"},
	592	{"writewordPWD", CmdWriteWordPWD, 1, "<Data> <Word> <Password> -- Write EM4xxx word data in password mode"},
7fe9b0b7	593	{NULL, NULL, 0, NULL}
	594	};
	595
	596	int CmdLFEM4X(const char *Cmd)
	597	{
	598	CmdsParse(CommandTable, Cmd);
	599	return 0;
	600	}
	601
	602	int CmdHelp(const char *Cmd)
	603	{
	604	CmdsHelp(CommandTable);
	605	return 0;
	606	}