[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];
  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;
}

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