[proxmark3-svn] / client / cmdhflegic.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.
//-----------------------------------------------------------------------------
// High frequency Legic commands
//-----------------------------------------------------------------------------

#include <stdio.h>
#include <string.h>
#include "proxusb.h"
#include "data.h"
#include "ui.h"
#include "cmdparser.h"
#include "cmdhflegic.h"
#include "cmdmain.h"

static int CmdHelp(const char *Cmd);

static command_t CommandTable[] = 
{
  {"help",        CmdHelp,        1, "This help"},
  {"decode",      CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
  {"reader",      CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},
  {"save",        CmdLegicSave,   0, "<filename> [<length>] -- Store samples"},
  {"load",        CmdLegicLoad,   0, "<filename> -- Restore samples"},
  {"sim",         CmdLegicRfSim,  0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
  {"write",       CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
  {"fill",        CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
  {NULL, NULL, 0, NULL}
};

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

int CmdHelp(const char *Cmd)
{
  CmdsHelp(CommandTable);
  return 0;
}

/*
 *  Output BigBuf and deobfuscate LEGIC RF tag data.
 *   This is based on information given in the talk held
 *  by Henryk Ploetz and Karsten Nohl at 26c3
 */
int CmdLegicDecode(const char *Cmd)
{
  int h, i, j, k, n;
  int segment_len = 0;
  int segment_flag = 0;
  int stamp_len = 0;
  int crc = 0;
  int wrp = 0;
  int wrc = 0;
  int data_buf[1032]; // receiver buffer
  char out_string[3076]; // just use big buffer - bad practice
  char token_type[4];
  int delivered = 0;

  h = 0;
  
  // copy data from proxmark into buffer
  for (i = 0; i < 256; i += 12, h += 48) {
    UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
    SendCommand(&c);
    WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K);
    
    for (j = 0; j < 48; j += 8) {
      for (k = 0; k < 8; k++) {
        data_buf[h+j+k] = sample_buf[j+k];
      }
      delivered += 8;
      if (delivered >= 1024)
        break;
    }
  }
    
  // Output CDF System area (9 bytes) plus remaining header area (12 bytes)
  
  PrintAndLog("\nCDF: System Area");
  
  PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x",
    data_buf[0],
    data_buf[1],
    data_buf[2],
    data_buf[3],
    data_buf[4]
  );
  
  crc = data_buf[4];
 
  switch (data_buf[5]&0x7f) {
    case 0x00 ... 0x2f:
      strncpy(token_type, "IAM",sizeof(token_type));
      break;
    case 0x30 ... 0x6f:
      strcpy(token_type, "SAM");
      break;
    case 0x70 ... 0x7f:
      strcpy(token_type, "GAM");
      break;
    default:
      strcpy(token_type, "???");
      break;
  }
  
  stamp_len = 0xfc - data_buf[6];
  
  PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
    data_buf[5],
    data_buf[6],
    token_type,
    (data_buf[5]&0x80)>>7,
    stamp_len
  );
  
  PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
    data_buf[7]&0x0f,
    (data_buf[7]&0x70)>>4,
    (data_buf[7]&0x80)>>7,
    data_buf[7],
    data_buf[8]
  );
  
  PrintAndLog("Remaining Header Area");
  
  PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
      data_buf[9],
    data_buf[10],
    data_buf[11],
    data_buf[12],
    data_buf[13],
    data_buf[14],
    data_buf[15],
    data_buf[16],
    data_buf[17],
    data_buf[18],
    data_buf[19],
    data_buf[20],
    data_buf[21]
  );
  
  PrintAndLog("\nADF: User Area");
  
  i = 22;  
  for (n=0; n<64; n++) {
    segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
    segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
    
    wrp = (data_buf[i+2]^crc);
    wrc = ((data_buf[i+3]^crc)&0x70)>>4;
    
     PrintAndLog("Segment %02u: raw header=%02x %02x %02x %02x, flag=%01x (valid=%01u, last=%01u), len=%04u, WRP=%02u, WRC=%02u, RD=%01u, CRC=%02x",
      n,
      data_buf[i]^crc,
      data_buf[i+1]^crc,
      data_buf[i+2]^crc,
      data_buf[i+3]^crc,
      segment_flag,
      (segment_flag&0x4)>>2,
      (segment_flag&0x8)>>3,
      segment_len,
      wrp,
      wrc,
      ((data_buf[i+3]^crc)&0x80)>>7,
      (data_buf[i+4]^crc)
    );
    
    i+=5;
    
    if (wrc>0) {
      PrintAndLog("WRC protected area:");
      for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
        sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
        out_string[j+2] = ' ';
      };
        
      out_string[j] = '\0';
    
      PrintAndLog("%s", out_string);
    }
    
    if (wrp>wrc) {
      PrintAndLog("Remaining write protected area:");
      
      for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
        sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
        out_string[j+2] = ' ';
      };
    
      out_string[j] = '\0';
    
      PrintAndLog("%s", out_string);
      if((wrp-wrc) == 8) {
        sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc);
        PrintAndLog("%s", out_string);
      }
    }
    
    PrintAndLog("Remaining segment payload:");
    for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
      sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
      out_string[j+2] = ' ';
    };
    
    out_string[j] = '\0';
    
    PrintAndLog("%s", out_string);
    
    // end with last segment
    if (segment_flag & 0x8)
      return 0;
  };
  return 0;
}

int CmdLegicRFRead(const char *Cmd)
{
  int byte_count=0,offset=0;
  sscanf(Cmd, "%i %i", &offset, &byte_count);
  if(byte_count == 0) byte_count = -1;
  if(byte_count + offset > 1024) byte_count = 1024 - offset;
  UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
  SendCommand(&c);
  return 0;
}

int CmdLegicLoad(const char *Cmd)
{
    FILE *f = fopen(Cmd, "r");
    if(!f) {
        PrintAndLog("couldn't open '%s'", Cmd);
        return -1;
    }
    char line[80]; int offset = 0; unsigned int data[8];
    while(fgets(line, sizeof(line), f)) {
        int res = sscanf(line, "%x %x %x %x %x %x %x %x", 
            &data[0], &data[1], &data[2], &data[3],
            &data[4], &data[5], &data[6], &data[7]);
        if(res != 8) {
          PrintAndLog("Error: could not read samples");
          fclose(f);
          return -1;
        }
        UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
        int j; for(j = 0; j < 8; j++) {
            c.d.asBytes[j] = data[j];
        }
        SendCommand(&c);
        WaitForResponse(CMD_ACK);
        offset += 8;
    }
    fclose(f);
    PrintAndLog("loaded %u samples", offset);
    return 0;
}

int CmdLegicSave(const char *Cmd)
{
  int n;
  int requested = 1024;
  int offset = 0;
  char filename[1024];
  sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
  if (offset % 4 != 0) {
    PrintAndLog("Offset must be a multiple of 4");
    return 0;
  }
  offset = offset/4;

  int delivered = 0;

  if (requested == 0) {
    n = 12;
    requested = 12;
  } else {
    n = requested/4;
  }

  FILE *f = fopen(filename, "w");
  if(!f) {
    PrintAndLog("couldn't open '%s'", Cmd+1);
    return -1;
  }

  for (int i = offset; i < n+offset; i += 12) {
    UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
    SendCommand(&c);
    WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K);
    for (int j = 0; j < 48; j += 8) {
      fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
        sample_buf[j+0],
        sample_buf[j+1],
        sample_buf[j+2],
        sample_buf[j+3],
        sample_buf[j+4],
        sample_buf[j+5],
        sample_buf[j+6],
        sample_buf[j+7]
      );
      delivered += 8;
      if (delivered >= requested)
        break;
    }
    if (delivered >= requested)
      break;
  }

  fclose(f);
  PrintAndLog("saved %u samples", delivered);
  return 0;
}

int CmdLegicRfSim(const char *Cmd)
{
   UsbCommand c={CMD_SIMULATE_TAG_LEGIC_RF};
   c.arg[0] = 6;
   c.arg[1] = 3;
   c.arg[2] = 0;
   sscanf(Cmd, " %i %i %i", &c.arg[0], &c.arg[1], &c.arg[2]);
   SendCommand(&c);
   return 0;
}

int CmdLegicRfWrite(const char *Cmd)
{
    UsbCommand c={CMD_WRITER_LEGIC_RF};
    int res = sscanf(Cmd, " 0x%x 0x%x", &c.arg[0], &c.arg[1]);
	if(res != 2) {
		PrintAndLog("Please specify the offset and length as two hex strings");
        return -1;
    }
    SendCommand(&c);
    return 0;
}

int CmdLegicRfFill(const char *Cmd)
{
    UsbCommand cmd ={CMD_WRITER_LEGIC_RF};
    int res = sscanf(Cmd, " 0x%x 0x%x 0x%x", &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
    if(res != 3) {
        PrintAndLog("Please specify the offset, length and value as two hex strings");
        return -1;
    }

    int i;
    UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
    for(i = 0; i < 48; i++) {
      c.d.asBytes[i] = cmd.arg[2];
    }
    for(i = 0; i < 22; i++) {
      c.arg[0] = i*48;
      SendCommand(&c);
      WaitForResponse(CMD_ACK);
    }
    SendCommand(&cmd);
    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	// High frequency Legic commands
	9	//-----------------------------------------------------------------------------
	10
8e220a91	11	#include <stdio.h>
8e220a91	12	#include <string.h>
7fe9b0b7	13	#include "proxusb.h"
41dab153	14	#include "data.h"
41dab153	15	#include "ui.h"
7fe9b0b7	16	#include "cmdparser.h"
7fe9b0b7	17	#include "cmdhflegic.h"
669c1b80	18	#include "cmdmain.h"
7fe9b0b7	19
	20	static int CmdHelp(const char *Cmd);
	21
7fe9b0b7	22	static command_t CommandTable[] =
	23	{
	24	{"help", CmdHelp, 1, "This help"},
669c1b80	25	{"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
41dab153	26	{"reader", CmdLegicRFRead, 0, "[offset [length]] -- read bytes from a LEGIC card"},
3612a8a8	27	{"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"},
	28	{"load", CmdLegicLoad, 0, "<filename> -- Restore samples"},
	29	{"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
	30	{"write", CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
	31	{"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
7fe9b0b7	32	{NULL, NULL, 0, NULL}
	33	};
	34
	35	int CmdHFLegic(const char *Cmd)
	36	{
	37	CmdsParse(CommandTable, Cmd);
	38	return 0;
	39	}
	40
	41	int CmdHelp(const char *Cmd)
	42	{
	43	CmdsHelp(CommandTable);
	44	return 0;
	45	}
669c1b80	46
	47	/*
	48	* Output BigBuf and deobfuscate LEGIC RF tag data.
	49	* This is based on information given in the talk held
	50	* by Henryk Ploetz and Karsten Nohl at 26c3
669c1b80	51	*/
	52	int CmdLegicDecode(const char *Cmd)
	53	{
	54	int h, i, j, k, n;
	55	int segment_len = 0;
	56	int segment_flag = 0;
	57	int stamp_len = 0;
	58	int crc = 0;
	59	int wrp = 0;
	60	int wrc = 0;
	61	int data_buf[1032]; // receiver buffer
	62	char out_string[3076]; // just use big buffer - bad practice
	63	char token_type[4];
	64	int delivered = 0;
	65
	66	h = 0;
	67
	68	// copy data from proxmark into buffer
	69	for (i = 0; i < 256; i += 12, h += 48) {
	70	UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
	71	SendCommand(&c);
	72	WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K);
	73
	74	for (j = 0; j < 48; j += 8) {
	75	for (k = 0; k < 8; k++) {
	76	data_buf[h+j+k] = sample_buf[j+k];
	77	}
	78	delivered += 8;
	79	if (delivered >= 1024)
	80	break;
	81	}
	82	}
	83
	84	// Output CDF System area (9 bytes) plus remaining header area (12 bytes)
	85
	86	PrintAndLog("\nCDF: System Area");
	87
	88	PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x",
	89	data_buf[0],
	90	data_buf[1],
	91	data_buf[2],
	92	data_buf[3],
	93	data_buf[4]
	94	);
	95
	96	crc = data_buf[4];
	97
	98	switch (data_buf[5]&0x7f) {
	99	case 0x00 ... 0x2f:
	100	strncpy(token_type, "IAM",sizeof(token_type));
	101	break;
	102	case 0x30 ... 0x6f:
	103	strcpy(token_type, "SAM");
	104	break;
	105	case 0x70 ... 0x7f:
	106	strcpy(token_type, "GAM");
	107	break;
	108	default:
	109	strcpy(token_type, "???");
	110	break;
	111	}
	112
	113	stamp_len = 0xfc - data_buf[6];
	114
115	PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
116	data_buf[5],
117	data_buf[6],
118	token_type,
119	(data_buf[5]&0x80)>>7,
120	stamp_len
121	);
122
123	PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
124	data_buf[7]&0x0f,
125	(data_buf[7]&0x70)>>4,
126	(data_buf[7]&0x80)>>7,
127	data_buf[7],
128	data_buf[8]
129	);
130
131	PrintAndLog("Remaining Header Area");
132
133	PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x",
134	data_buf[9],
135	data_buf[10],
136	data_buf[11],
137	data_buf[12],
138	data_buf[13],
139	data_buf[14],
140	data_buf[15],
141	data_buf[16],
142	data_buf[17],
143	data_buf[18],
144	data_buf[19],
145	data_buf[20],
146	data_buf[21]
147	);
148
149	PrintAndLog("\nADF: User Area");
150
41dab153	151	i = 22;
669c1b80	152	for (n=0; n<64; n++) {
	153	segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
	154	segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
	155
	156	wrp = (data_buf[i+2]^crc);
	157	wrc = ((data_buf[i+3]^crc)&0x70)>>4;
	158
	159	PrintAndLog("Segment %02u: raw header=%02x %02x %02x %02x, flag=%01x (valid=%01u, last=%01u), len=%04u, WRP=%02u, WRC=%02u, RD=%01u, CRC=%02x",
	160	n,
	161	data_buf[i]^crc,
	162	data_buf[i+1]^crc,
	163	data_buf[i+2]^crc,
	164	data_buf[i+3]^crc,
	165	segment_flag,
	166	(segment_flag&0x4)>>2,
	167	(segment_flag&0x8)>>3,
	168	segment_len,
	169	wrp,
	170	wrc,
	171	((data_buf[i+3]^crc)&0x80)>>7,
	172	(data_buf[i+4]^crc)
	173	);
	174
	175	i+=5;
	176
	177	if (wrc>0) {
	178	PrintAndLog("WRC protected area:");
31332265	179	for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) {
669c1b80	180	sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
	181	out_string[j+2] = ' ';
	182	};
	183
	184	out_string[j] = '\0';
	185
	186	PrintAndLog("%s", out_string);
	187	}
	188
	189	if (wrp>wrc) {
	190	PrintAndLog("Remaining write protected area:");
	191
31332265	192	for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
669c1b80	193	sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
	194	out_string[j+2] = ' ';
	195	};
	196
	197	out_string[j] = '\0';
	198
	199	PrintAndLog("%s", out_string);
	200	if((wrp-wrc) == 8) {
	201	sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc);
	202	PrintAndLog("%s", out_string);
	203	}
	204	}
	205
	206	PrintAndLog("Remaining segment payload:");
31332265	207	for (k=0, j=0; k < (segment_len - wrp - 5) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
669c1b80	208	sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
	209	out_string[j+2] = ' ';
	210	};
	211
	212	out_string[j] = '\0';
	213
	214	PrintAndLog("%s", out_string);
	215
	216	// end with last segment
	217	if (segment_flag & 0x8)
	218	return 0;
	219	};
	220	return 0;
	221	}
41dab153	222
	223	int CmdLegicRFRead(const char *Cmd)
	224	{
	225	int byte_count=0,offset=0;
	226	sscanf(Cmd, "%i %i", &offset, &byte_count);
a2b1414f	227	if(byte_count == 0) byte_count = -1;
a2b1414f	228	if(byte_count + offset > 1024) byte_count = 1024 - offset;
41dab153	229	UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
	230	SendCommand(&c);
	231	return 0;
	232	}
3612a8a8	233
	234	int CmdLegicLoad(const char *Cmd)
	235	{
	236	FILE *f = fopen(Cmd, "r");
	237	if(!f) {
	238	PrintAndLog("couldn't open '%s'", Cmd);
	239	return -1;
	240	}
	241	char line[80]; int offset = 0; unsigned int data[8];
	242	while(fgets(line, sizeof(line), f)) {
	243	int res = sscanf(line, "%x %x %x %x %x %x %x %x",
	244	&data[0], &data[1], &data[2], &data[3],
	245	&data[4], &data[5], &data[6], &data[7]);
	246	if(res != 8) {
	247	PrintAndLog("Error: could not read samples");
	248	fclose(f);
	249	return -1;
	250	}
	251	UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
	252	int j; for(j = 0; j < 8; j++) {
	253	c.d.asBytes[j] = data[j];
	254	}
	255	SendCommand(&c);
	256	WaitForResponse(CMD_ACK);
	257	offset += 8;
	258	}
	259	fclose(f);
	260	PrintAndLog("loaded %u samples", offset);
	261	return 0;
	262	}
	263
	264	int CmdLegicSave(const char *Cmd)
	265	{
	266	int n;
	267	int requested = 1024;
	268	int offset = 0;
	269	char filename[1024];
	270	sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
	271	if (offset % 4 != 0) {
	272	PrintAndLog("Offset must be a multiple of 4");
	273	return 0;
	274	}
	275	offset = offset/4;
	276
	277	int delivered = 0;
	278
	279	if (requested == 0) {
	280	n = 12;
	281	requested = 12;
	282	} else {
	283	n = requested/4;
	284	}
	285
	286	FILE *f = fopen(filename, "w");
	287	if(!f) {
	288	PrintAndLog("couldn't open '%s'", Cmd+1);
	289	return -1;
	290	}
	291
	292	for (int i = offset; i < n+offset; i += 12) {
	293	UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}};
	294	SendCommand(&c);
	295	WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K);
	296	for (int j = 0; j < 48; j += 8) {
297	fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
298	sample_buf[j+0],
299	sample_buf[j+1],
300	sample_buf[j+2],
301	sample_buf[j+3],
302	sample_buf[j+4],
303	sample_buf[j+5],
304	sample_buf[j+6],
305	sample_buf[j+7]
306	);
307	delivered += 8;
308	if (delivered >= requested)
309	break;
310	}
311	if (delivered >= requested)
312	break;
313	}
314
315	fclose(f);
316	PrintAndLog("saved %u samples", delivered);
317	return 0;
318	}
319
320	int CmdLegicRfSim(const char *Cmd)
321	{
322	UsbCommand c={CMD_SIMULATE_TAG_LEGIC_RF};
323	c.arg[0] = 6;
324	c.arg[1] = 3;
325	c.arg[2] = 0;
326	sscanf(Cmd, " %i %i %i", &c.arg[0], &c.arg[1], &c.arg[2]);
327	SendCommand(&c);
328	return 0;
329	}
330
331	int CmdLegicRfWrite(const char *Cmd)
332	{
333	UsbCommand c={CMD_WRITER_LEGIC_RF};
334	int res = sscanf(Cmd, " 0x%x 0x%x", &c.arg[0], &c.arg[1]);
335	if(res != 2) {
336	PrintAndLog("Please specify the offset and length as two hex strings");
337	return -1;
338	}
339	SendCommand(&c);
340	return 0;
341	}
342
343	int CmdLegicRfFill(const char *Cmd)
344	{
345	UsbCommand cmd ={CMD_WRITER_LEGIC_RF};
346	int res = sscanf(Cmd, " 0x%x 0x%x 0x%x", &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
347	if(res != 3) {
348	PrintAndLog("Please specify the offset, length and value as two hex strings");
349	return -1;
350	}
351
352	int i;
353	UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
354	for(i = 0; i < 48; i++) {
355	c.d.asBytes[i] = cmd.arg[2];
356	}
357	for(i = 0; i < 22; i++) {
358	c.arg[0] = i*48;
359	SendCommand(&c);
360	WaitForResponse(CMD_ACK);
361	}
362	SendCommand(&cmd);
363	return 0;
364	}
365