[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 "proxmark3.h"
#include "data.h"
#include "ui.h"
#include "cmdparser.h"
#include "cmdhflegic.h"
#include "cmdmain.h"
#include "util.h"
#include "crc.h"
static int CmdHelp(const char *Cmd);

int usage_legic_calccrc8(void){
	PrintAndLog("Calculates the legic crc8 on the input hexbytes.");
	PrintAndLog("There must be an even number of hexsymbols as input.");
	PrintAndLog("Usage:  hf legic crc8 <hexbytes>");
	PrintAndLog("Options :");
	PrintAndLog("  <hexbytes>   : hex bytes in a string");
	PrintAndLog("");
	PrintAndLog("Sample  : hf legic crc8 deadbeef1122");
	return 0;
}

int usage_legic_load(void){
	PrintAndLog("It loads datasamples from the file `filename` to device memory");
	PrintAndLog("Usage:  hf legic load <file name>");
	PrintAndLog(" sample: hf legic load filename");
	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 i, k, n;
	int segment_len = 0;
	int segment_flag = 0;
	int stamp_len = 0;
	int crc = 0;
	int wrp = 0;
	int wrc = 0;
	uint8_t data_buf[1200]; // receiver buffer
	//char out_string[3076]; // just use big buffer - bad practice
	char token_type[4];

	// copy data from proxmark into buffer
	GetFromBigBuf(data_buf,sizeof(data_buf),0);
	WaitForResponse(CMD_ACK,NULL);

	// Output CDF System area (9 bytes) plus remaining header area (12 bytes)
	crc = data_buf[4];
	uint32_t calc_crc =  CRC8Legic(data_buf, 4);	
	
	PrintAndLog("\nCDF: System Area");

	PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
		data_buf[0],
		data_buf[1],
		data_buf[2],
		data_buf[3],
		data_buf[4],
		(calc_crc == crc) ? "OK":"Fail" 
	);
 
	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("%s", sprint_hex(data_buf+9, 13));
	PrintAndLog("\nADF: User Area");
  
	i = 22;  
	uint8_t segCrcBytes[8] = {0x00};
	uint32_t segCalcCRC = 0;
	uint32_t segCRC = 0;
	
	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;

		/* validate segment-crc */
		segCRC = data_buf[i+4]^crc;
		
		segCrcBytes[0]=data_buf[0]; //uid0
		segCrcBytes[1]=data_buf[1]; //uid1
		segCrcBytes[2]=data_buf[2]; //uid2
		segCrcBytes[3]=data_buf[3]; //uid3
		segCrcBytes[4]=(data_buf[i]^crc); //hdr0
		segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
		segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
		segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
		segCalcCRC = CRC8Legic(segCrcBytes, 8);

		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  (%s)",
			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,
			segCRC,
			( segCRC == segCalcCRC ) ? "OK" : "fail"
		);

		i += 5;
    
		if ( wrc>0 ) {
			PrintAndLog("WRC protected area:");
			
			for ( k=i; k < wrc; k++)
				data_buf[k] ^= crc;
			
			for ( k=i; k < wrc; k += 8)
				PrintAndLog("%s", sprint_hex( data_buf+k, 8)  );
			
			i += wrc;
		}
    
		if ( wrp>wrc ) {
			PrintAndLog("Remaining write protected area:");

			if ( data_buf[k] > 0) {
				for (k=i; k < (wrp-wrc); k++)
					data_buf[k] ^= crc;
			}
			
			for (k=i; k < (wrp-wrc); k++)
				PrintAndLog("%s", sprint_hex( data_buf+k, 16)  );

			i += (wrp-wrc);
			
			if( (wrp-wrc) == 8 )
				PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);			
		}
    
		PrintAndLog("Remaining segment payload:");
		
		if ( data_buf[k] > 0 ) {
			for ( k=i; k < (segment_len - wrp - 5); k++)
				data_buf[k] ^= crc;
		}
		
		for ( k=i; k < (segment_len - wrp - 5); k++)
			PrintAndLog("%s", sprint_hex( data_buf+k, 16)  );
    
		// end with last segment
		if (segment_flag & 0x8) return 0;

	} // end for loop
	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}};
	clearCommandBuffer();
	SendCommand(&c);
	return 0;
}

int CmdLegicLoad(const char *Cmd) {
	
	char cmdp = param_getchar(Cmd, 0);
	if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();

	char filename[FILE_PATH_SIZE] = {0x00};
	int len = strlen(Cmd);
	
	if (len > FILE_PATH_SIZE) {
		PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
		return 0;
	}
	memcpy(filename, Cmd, len);

    FILE *f = fopen(filename, "r");
    if(!f) {
        PrintAndLog("couldn't open '%s'", Cmd);
        return -1;
    }
	
    char line[80]; 
	int offset = 0; 
	uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
	int index = 0;
	int totalbytes = 0;
    while ( fgets(line, sizeof(line), f) ) {
        int res = sscanf(line, "%x %x %x %x %x %x %x %x", 
            (unsigned int *)&data[index],
			(unsigned int *)&data[index + 1],
			(unsigned int *)&data[index + 2],
			(unsigned int *)&data[index + 3],
            (unsigned int *)&data[index + 4],
			(unsigned int *)&data[index + 5],
			(unsigned int *)&data[index + 6],
			(unsigned int *)&data[index + 7]);
			
        if(res != 8) {
          PrintAndLog("Error: could not read samples");
          fclose(f);
          return -1;
        }
		index += res;
			
		if ( index == USB_CMD_DATA_SIZE ){
//			PrintAndLog("sent %d | %d | %d", index, offset, totalbytes);
			UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
			memcpy(c.d.asBytes, data, sizeof(data));
			clearCommandBuffer();
			SendCommand(&c);
			WaitForResponse(CMD_ACK, NULL);

			offset += index;
			totalbytes += index;
			index = 0;
		}
    }
    fclose(f);
	
	// left over bytes?
	if ( index != 0 ) {
		UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
		memcpy(c.d.asBytes, data, 8);
		clearCommandBuffer();
		SendCommand(&c);
		WaitForResponse(CMD_ACK, NULL);
		totalbytes += index;		
	}
	
    PrintAndLog("loaded %u samples", totalbytes);
    return 0;
}

int CmdLegicSave(const char *Cmd) {
	int requested = 1024;
	int offset = 0;
	int delivered = 0;
	char filename[FILE_PATH_SIZE];
	uint8_t got[1024] = {0x00};

	sscanf(Cmd, " %s %i %i", filename, &requested, &offset);

	/* If no length given save entire legic read buffer */
	/* round up to nearest 8 bytes so the saved data can be used with legicload */
	if (requested == 0)
		requested = 1024;

	if (requested % 8 != 0) {
		int remainder = requested % 8;
		requested = requested + 8 - remainder;
	}

	if (offset + requested > sizeof(got)) {
		PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
		return 0;
	}

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

	GetFromBigBuf(got,requested,offset);
	WaitForResponse(CMD_ACK,NULL);

	for (int j = 0; j < requested; j += 8) {
		fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
			got[j+0], got[j+1], got[j+2], got[j+3],
			got[j+4], got[j+5],	got[j+6], got[j+7]
		);
		delivered += 8;
		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, {6,3,0}};
	sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
	clearCommandBuffer();
	SendCommand(&c);
	return 0;
}

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

int CmdLegicRfFill(const char *Cmd) {
    UsbCommand cmd = {CMD_WRITER_LEGIC_RF};
    int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &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,NULL);
	}
	clearCommandBuffer();
    SendCommand(&cmd);
    return 0;
 }

int CmdLegicCalcCrc8(const char *Cmd){

	int len =  strlen(Cmd);	
	if (len & 1 ) return usage_legic_calccrc8(); 
	
	uint8_t *data = malloc(len);
	if ( data == NULL ) return 1;
		
	param_gethex(Cmd, 0, data, len );
	
	uint32_t checksum =  CRC8Legic(data, len/2);	
	PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum );
	free(data);
	return 0;
} 
 
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)"},
	{"read",	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"},
	{"crc8",	CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
	{NULL, NULL, 0, NULL}
};

int CmdHFLegic(const char *Cmd) {
	clearCommandBuffer();
	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	// High frequency Legic commands
	9	//-----------------------------------------------------------------------------
	10
8e220a91	11	#include <stdio.h>
8e220a91	12	#include <string.h>
902cb3c0	13	#include "proxmark3.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"
31d1caa5	19	#include "util.h"
3b920280	20	#include "crc.h"
7fe9b0b7	21	static int CmdHelp(const char *Cmd);
7fe9b0b7	22
3b920280	23	int usage_legic_calccrc8(void){
	24	PrintAndLog("Calculates the legic crc8 on the input hexbytes.");
	25	PrintAndLog("There must be an even number of hexsymbols as input.");
	26	PrintAndLog("Usage: hf legic crc8 <hexbytes>");
	27	PrintAndLog("Options :");
	28	PrintAndLog(" <hexbytes> : hex bytes in a string");
	29	PrintAndLog("");
	30	PrintAndLog("Sample : hf legic crc8 deadbeef1122");
	31	return 0;
	32	}
	33
e579e768	34	int usage_legic_load(void){
	35	PrintAndLog("It loads datasamples from the file `filename` to device memory");
	36	PrintAndLog("Usage: hf legic load <file name>");
	37	PrintAndLog(" sample: hf legic load filename");
	38	return 0;
	39	}
	40
669c1b80	41	/*
	42	* Output BigBuf and deobfuscate LEGIC RF tag data.
	43	* This is based on information given in the talk held
	44	* by Henryk Ploetz and Karsten Nohl at 26c3
669c1b80	45	*/
3b920280	46	int CmdLegicDecode(const char *Cmd) {
3b920280	47	int i, k, n;
52cf34c1	48	int segment_len = 0;
	49	int segment_flag = 0;
	50	int stamp_len = 0;
	51	int crc = 0;
	52	int wrp = 0;
	53	int wrc = 0;
3b920280	54	uint8_t data_buf[1200]; // receiver buffer
3b920280	55	//char out_string[3076]; // just use big buffer - bad practice
52cf34c1	56	char token_type[4];
	57
	58	// copy data from proxmark into buffer
	59	GetFromBigBuf(data_buf,sizeof(data_buf),0);
	60	WaitForResponse(CMD_ACK,NULL);
	61
	62	// Output CDF System area (9 bytes) plus remaining header area (12 bytes)
3b920280	63	crc = data_buf[4];
	64	uint32_t calc_crc = CRC8Legic(data_buf, 4);
	65
52cf34c1	66	PrintAndLog("\nCDF: System Area");
52cf34c1	67
3b920280	68	PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
52cf34c1	69	data_buf[0],
	70	data_buf[1],
	71	data_buf[2],
	72	data_buf[3],
3b920280	73	data_buf[4],
e579e768	74	(calc_crc == crc) ? "OK":"Fail"
52cf34c1	75	);
669c1b80	76
52cf34c1	77	switch (data_buf[5]&0x7f) {
	78	case 0x00 ... 0x2f:
	79	strncpy(token_type, "IAM",sizeof(token_type));
	80	break;
	81	case 0x30 ... 0x6f:
	82	strcpy(token_type, "SAM");
	83	break;
	84	case 0x70 ... 0x7f:
	85	strcpy(token_type, "GAM");
	86	break;
	87	default:
	88	strcpy(token_type, "???");
	89	break;
	90	}
	91
	92	stamp_len = 0xfc - data_buf[6];
	93
	94	PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
	95	data_buf[5],
	96	data_buf[6],
	97	token_type,
	98	(data_buf[5]&0x80)>>7,
	99	stamp_len
	100	);
	101
	102	PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
	103	data_buf[7]&0x0f,
	104	(data_buf[7]&0x70)>>4,
	105	(data_buf[7]&0x80)>>7,
	106	data_buf[7],
	107	data_buf[8]
	108	);
	109
	110	PrintAndLog("Remaining Header Area");
	111	PrintAndLog("%s", sprint_hex(data_buf+9, 13));
	112	PrintAndLog("\nADF: User Area");
669c1b80	113
52cf34c1	114	i = 22;
e579e768	115	uint8_t segCrcBytes[8] = {0x00};
	116	uint32_t segCalcCRC = 0;
	117	uint32_t segCRC = 0;
	118
52cf34c1	119	for ( n=0; n<64; n++ ) {
	120	segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
	121	segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
	122
	123	wrp = (data_buf[i+2]^crc);
	124	wrc = ((data_buf[i+3]^crc)&0x70)>>4;
	125
e579e768	126	/* validate segment-crc */
	127	segCRC = data_buf[i+4]^crc;
	128
	129	segCrcBytes[0]=data_buf[0]; //uid0
	130	segCrcBytes[1]=data_buf[1]; //uid1
	131	segCrcBytes[2]=data_buf[2]; //uid2
	132	segCrcBytes[3]=data_buf[3]; //uid3
	133	segCrcBytes[4]=(data_buf[i]^crc); //hdr0
	134	segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
	135	segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
	136	segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
	137	segCalcCRC = CRC8Legic(segCrcBytes, 8);
	138
	139	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 (%s)",
52cf34c1	140	n,
	141	data_buf[i]^crc,
	142	data_buf[i+1]^crc,
	143	data_buf[i+2]^crc,
	144	data_buf[i+3]^crc,
	145	segment_flag,
	146	(segment_flag&0x4)>>2,
	147	(segment_flag&0x8)>>3,
	148	segment_len,
	149	wrp,
	150	wrc,
	151	((data_buf[i+3]^crc)&0x80)>>7,
e579e768	152	segCRC,
e579e768	153	( segCRC == segCalcCRC ) ? "OK" : "fail"
52cf34c1	154	);
52cf34c1	155
3b920280	156	i += 5;
669c1b80	157
52cf34c1	158	if ( wrc>0 ) {
52cf34c1	159	PrintAndLog("WRC protected area:");
3b920280	160
	161	for ( k=i; k < wrc; k++)
	162	data_buf[k] ^= crc;
	163
	164	for ( k=i; k < wrc; k += 8)
	165	PrintAndLog("%s", sprint_hex( data_buf+k, 8) );
	166
	167	i += wrc;
52cf34c1	168	}
669c1b80	169
52cf34c1	170	if ( wrp>wrc ) {
	171	PrintAndLog("Remaining write protected area:");
	172
3b920280	173	if ( data_buf[k] > 0) {
	174	for (k=i; k < (wrp-wrc); k++)
	175	data_buf[k] ^= crc;
52cf34c1	176	}
3b920280	177
	178	for (k=i; k < (wrp-wrc); k++)
	179	PrintAndLog("%s", sprint_hex( data_buf+k, 16) );
	180
	181	i += (wrp-wrc);
	182
	183	if( (wrp-wrc) == 8 )
	184	PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
52cf34c1	185	}
669c1b80	186
52cf34c1	187	PrintAndLog("Remaining segment payload:");
3b920280	188
	189	if ( data_buf[k] > 0 ) {
	190	for ( k=i; k < (segment_len - wrp - 5); k++)
	191	data_buf[k] ^= crc;
	192	}
	193
	194	for ( k=i; k < (segment_len - wrp - 5); k++)
	195	PrintAndLog("%s", sprint_hex( data_buf+k, 16) );
669c1b80	196
52cf34c1	197	// end with last segment
	198	if (segment_flag & 0x8) return 0;
	199
	200	} // end for loop
	201	return 0;
669c1b80	202	}
41dab153	203
52cf34c1	204	int CmdLegicRFRead(const char *Cmd) {
	205	int byte_count=0, offset=0;
	206	sscanf(Cmd, "%i %i", &offset, &byte_count);
	207	if(byte_count == 0) byte_count = -1;
	208	if(byte_count + offset > 1024) byte_count = 1024 - offset;
	209
	210	UsbCommand c= {CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
	211	clearCommandBuffer();
	212	SendCommand(&c);
	213	return 0;
41dab153	214	}
3612a8a8	215
52cf34c1	216	int CmdLegicLoad(const char *Cmd) {
b915fda3	217
52cf34c1	218	char cmdp = param_getchar(Cmd, 0);
e579e768	219	if ( cmdp == 'H' \|\| cmdp == 'h' \|\| cmdp == 0x00) return usage_legic_load();
b915fda3	220
e579e768	221	char filename[FILE_PATH_SIZE] = {0x00};
	222	int len = strlen(Cmd);
	223
b915fda3	224	if (len > FILE_PATH_SIZE) {
	225	PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
	226	return 0;
	227	}
	228	memcpy(filename, Cmd, len);
	229
	230	FILE *f = fopen(filename, "r");
3612a8a8	231	if(!f) {
	232	PrintAndLog("couldn't open '%s'", Cmd);
	233	return -1;
	234	}
52cf34c1	235
52cf34c1	236	char line[80];
810f5379	237	int offset = 0;
c6e0a2eb	238	uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
	239	int index = 0;
	240	int totalbytes = 0;
52cf34c1	241	while ( fgets(line, sizeof(line), f) ) {
3612a8a8	242	int res = sscanf(line, "%x %x %x %x %x %x %x %x",
c6e0a2eb	243	(unsigned int *)&data[index],
	244	(unsigned int *)&data[index + 1],
	245	(unsigned int *)&data[index + 2],
	246	(unsigned int *)&data[index + 3],
	247	(unsigned int *)&data[index + 4],
	248	(unsigned int *)&data[index + 5],
	249	(unsigned int *)&data[index + 6],
	250	(unsigned int *)&data[index + 7]);
e7d099dc	251
3612a8a8	252	if(res != 8) {
	253	PrintAndLog("Error: could not read samples");
	254	fclose(f);
	255	return -1;
	256	}
c6e0a2eb	257	index += res;
	258
	259	if ( index == USB_CMD_DATA_SIZE ){
	260	// PrintAndLog("sent %d \| %d \| %d", index, offset, totalbytes);
	261	UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
	262	memcpy(c.d.asBytes, data, sizeof(data));
	263	clearCommandBuffer();
	264	SendCommand(&c);
	265	WaitForResponse(CMD_ACK, NULL);
	266
	267	offset += index;
	268	totalbytes += index;
	269	index = 0;
	270	}
3612a8a8	271	}
3612a8a8	272	fclose(f);
c6e0a2eb	273
	274	// left over bytes?
	275	if ( index != 0 ) {
	276	UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
	277	memcpy(c.d.asBytes, data, 8);
	278	clearCommandBuffer();
	279	SendCommand(&c);
	280	WaitForResponse(CMD_ACK, NULL);
	281	totalbytes += index;
	282	}
	283
	284	PrintAndLog("loaded %u samples", totalbytes);
3612a8a8	285	return 0;
	286	}
	287
52cf34c1	288	int CmdLegicSave(const char *Cmd) {
	289	int requested = 1024;
	290	int offset = 0;
	291	int delivered = 0;
	292	char filename[FILE_PATH_SIZE];
	293	uint8_t got[1024] = {0x00};
	294
	295	sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
	296
	297	/* If no length given save entire legic read buffer */
	298	/* round up to nearest 8 bytes so the saved data can be used with legicload */
e7d099dc	299	if (requested == 0)
52cf34c1	300	requested = 1024;
52cf34c1	301
	302	if (requested % 8 != 0) {
	303	int remainder = requested % 8;
	304	requested = requested + 8 - remainder;
	305	}
	306
	307	if (offset + requested > sizeof(got)) {
	308	PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
	309	return 0;
	310	}
	311
	312	FILE *f = fopen(filename, "w");
	313	if(!f) {
	314	PrintAndLog("couldn't open '%s'", Cmd+1);
	315	return -1;
	316	}
	317
	318	GetFromBigBuf(got,requested,offset);
	319	WaitForResponse(CMD_ACK,NULL);
	320
	321	for (int j = 0; j < requested; j += 8) {
	322	fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
c6e0a2eb	323	got[j+0], got[j+1], got[j+2], got[j+3],
c6e0a2eb	324	got[j+4], got[j+5], got[j+6], got[j+7]
52cf34c1	325	);
	326	delivered += 8;
	327	if (delivered >= requested) break;
	328	}
	329
	330	fclose(f);
	331	PrintAndLog("saved %u samples", delivered);
	332	return 0;
3612a8a8	333	}
3612a8a8	334
52cf34c1	335	int CmdLegicRfSim(const char *Cmd) {
3b920280	336	UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
52cf34c1	337	sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
	338	clearCommandBuffer();
	339	SendCommand(&c);
	340	return 0;
3612a8a8	341	}
3612a8a8	342
52cf34c1	343	int CmdLegicRfWrite(const char *Cmd) {
52cf34c1	344	UsbCommand c = {CMD_WRITER_LEGIC_RF};
125a98a1	345	int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
3612a8a8	346	if(res != 2) {
	347	PrintAndLog("Please specify the offset and length as two hex strings");
	348	return -1;
	349	}
52cf34c1	350	clearCommandBuffer();
3612a8a8	351	SendCommand(&c);
	352	return 0;
	353	}
	354
52cf34c1	355	int CmdLegicRfFill(const char *Cmd) {
52cf34c1	356	UsbCommand cmd = {CMD_WRITER_LEGIC_RF};
1a07fd51	357	int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
3612a8a8	358	if(res != 3) {
	359	PrintAndLog("Please specify the offset, length and value as two hex strings");
	360	return -1;
	361	}
	362
	363	int i;
52cf34c1	364	UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
3612a8a8	365	for(i = 0; i < 48; i++) {
52cf34c1	366	c.d.asBytes[i] = cmd.arg[2];
3612a8a8	367	}
52cf34c1	368
	369	for(i = 0; i < 22; i++) {
	370	c.arg[0] = i*48;
	371	SendCommand(&c);
	372	WaitForResponse(CMD_ACK,NULL);
	373	}
	374	clearCommandBuffer();
3612a8a8	375	SendCommand(&cmd);
	376	return 0;
	377	}
	378
3b920280	379	int CmdLegicCalcCrc8(const char *Cmd){
	380
	381	int len = strlen(Cmd);
	382	if (len & 1 ) return usage_legic_calccrc8();
	383
	384	uint8_t *data = malloc(len);
	385	if ( data == NULL ) return 1;
	386
	387	param_gethex(Cmd, 0, data, len );
	388
	389	uint32_t checksum = CRC8Legic(data, len/2);
	390	PrintAndLog("Bytes: %s \|\| CRC8: %X", sprint_hex(data, len/2), checksum );
	391	free(data);
	392	return 0;
	393	}
	394
52cf34c1	395	static command_t CommandTable[] = {
3b920280	396	{"help", CmdHelp, 1, "This help"},
	397	{"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
	398	{"read", CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"},
	399	{"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"},
	400	{"load", CmdLegicLoad, 0, "<filename> -- Restore samples"},
	401	{"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
	402	{"write", CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
	403	{"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
	404	{"crc8", CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
52cf34c1	405	{NULL, NULL, 0, NULL}
	406	};
	407
	408	int CmdHFLegic(const char *Cmd) {
	409	clearCommandBuffer();
	410	CmdsParse(CommandTable, Cmd);
	411	return 0;
	412	}
	413
	414	int CmdHelp(const char *Cmd) {
	415	CmdsHelp(CommandTable);
	416	return 0;
	417	}