[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 "cmdhflegic.h"

static int CmdHelp(const char *Cmd);

int usage_legic_calccrc8(void){
	PrintAndLog("Calculates the legic crc8/crc16 on the input hexbytes.");
	PrintAndLog("There must be an even number of hexsymbols as input.");
	PrintAndLog("Usage:  hf legic crc8 [h] b <hexbytes> u <uidcrc>");
	PrintAndLog("Options :");
	PrintAndLog("      b <hexbytes>  : hex bytes");
	PrintAndLog("      u <uidcrc>    : MCC hexbyte");
	PrintAndLog("");
	PrintAndLog("Samples :");
	PrintAndLog("      hf legic crc8 b deadbeef1122");
	PrintAndLog("      hf legic crc8 b deadbeef1122 u 9A");
	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;
}

int usage_legic_read(void){	
	PrintAndLog("Read data from a legic tag.");
	PrintAndLog("Usage:  hf legic read <offset> <num of bytes>");
	PrintAndLog("Options :");
	PrintAndLog("  <offset>        : offset in data array to start download from");
	PrintAndLog("  <num of bytes>  : number of bytes to download");
	PrintAndLog("");
	PrintAndLog(" sample: hf legic read");
	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) {
	// Index for the bytearray.
	int i = 0;
	int k = 0, segmentNum;
	int segment_len = 0;
	int segment_flag = 0;
	uint8_t stamp_len = 0;
	int crc = 0;
	int wrp = 0;
	int wrc = 0;
	uint8_t data_buf[1052]; // receiver buffer,  should be 1024..
	char token_type[5];
	int dcf;
	int bIsSegmented = 0;

	// download EML memory, where the "legic read" command puts the data.
	GetEMLFromBigBuf(data_buf, sizeof(data_buf), 0);
	if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
		PrintAndLog("Command execute timeout");
		return 1;
	}
	
	// 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("------------------------------------------------------");
	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" 
	);
 

	token_type[0] = 0;
	dcf = ((int)data_buf[6] << 8) | (int)data_buf[5];

	// New unwritten media?
	if(dcf == 0xFFFF) {

		PrintAndLog("DCF: %d (%02x %02x), Token Type=NM (New Media)",
			dcf,
			data_buf[5],
			data_buf[6]
		);
	
	} else if(dcf > 60000) {		// Master token?

		int fl = 0;

		if(data_buf[6] == 0xec) {
			strncpy(token_type, "XAM", sizeof(token_type));
			fl = 1;
			stamp_len = 0x0c - (data_buf[5] >> 4);
		} else {
	switch (data_buf[5] & 0x7f) {
		case 0x00 ... 0x2f:
			strncpy(token_type, "IAM",sizeof(token_type));
					fl = (0x2f - (data_buf[5] & 0x7f)) + 1;
			break;
		case 0x30 ... 0x6f:
			strncpy(token_type, "SAM",sizeof(token_type));
					fl = (0x6f - (data_buf[5] & 0x7f)) + 1;
			break;
		case 0x70 ... 0x7f:
			strncpy(token_type, "GAM",sizeof(token_type));
					fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
			break;
	}

	stamp_len = 0xfc - data_buf[6];
		}

		PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u), OL=%02u, FL=%02u",
			dcf,
		data_buf[5],
		data_buf[6],
		token_type,
		(data_buf[5]&0x80)>>7,
			stamp_len,
			fl
	);

	} else {						// Is IM(-S) type of card...

		if(data_buf[7] == 0x9F && data_buf[8] == 0xFF) {
			bIsSegmented = 1;
			strncpy(token_type, "IM-S", sizeof(token_type));
		} else {
			strncpy(token_type, "IM", sizeof(token_type));
		}

		PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u)",
			dcf,
			data_buf[5],
			data_buf[6],
			token_type,
			(data_buf[5]&0x80)>>7
		);
	}

	// Makes no sence to show this on blank media...
	if(dcf != 0xFFFF) {

		if(bIsSegmented) {
			PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, SSC=%02x",
		data_buf[7]&0x0f,
		(data_buf[7]&0x70)>>4,
		(data_buf[7]&0x80)>>7,
		data_buf[8]
	);
		}

		// Header area is only available on IM-S cards, on master tokens this data is the master token data itself
		if(bIsSegmented || dcf > 60000) {
			if(dcf > 60000) {
				PrintAndLog("Master token data");
				PrintAndLog("%s", sprint_hex(data_buf+8, 14));
			} else {
	PrintAndLog("Remaining Header Area");
	PrintAndLog("%s", sprint_hex(data_buf+9, 13));
			}
		}
	}

	
	uint8_t segCrcBytes[8] = {0x00};
	uint32_t segCalcCRC = 0;
	uint32_t segCRC = 0;


	// Data card?
	if(dcf <= 60000) {
	
	PrintAndLog("\nADF: User Area");
	PrintAndLog("------------------------------------------------------");

		if(bIsSegmented) {

			// Data start point on segmented cards
	i = 22;  

			// decode segments
			for (segmentNum=1; segmentNum < 128; segmentNum++ )
			{
		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;

		bool hasWRC = (wrc > 0);
		bool hasWRP = (wrp > wrc);
		int wrp_len = (wrp - wrc);
		int remain_seg_payload_len = (segment_len - wrp - 5);
		
		// validate segment-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);
		segCRC = data_buf[i+4]^crc;

		PrintAndLog("Segment %02u \nraw header | 0x%02X 0x%02X 0x%02X 0x%02X \nSegment len: %u,  Flag: 0x%X (valid:%01u, last:%01u), WRP: %02u, WRC: %02u, RD: %01u, CRC: 0x%02X (%s)",
			segmentNum,
			data_buf[i]^crc,
			data_buf[i+1]^crc,
			data_buf[i+2]^crc,
			data_buf[i+3]^crc,
			segment_len, 
			segment_flag,
			(segment_flag & 0x4) >> 2,
			(segment_flag & 0x8) >> 3,
			wrp,
			wrc,
			((data_buf[i+3]^crc) & 0x80) >> 7,
			segCRC,
			( segCRC == segCalcCRC ) ? "OK" : "fail"
		);

		i += 5;
    
		if ( hasWRC ) {
			PrintAndLog("WRC protected area:   (I %d | K %d| WRC %d)", i, k, wrc);
			PrintAndLog("\nrow  | data");
			PrintAndLog("-----+------------------------------------------------");

					for ( k=i; k < (i+wrc); ++k)
					data_buf[k] ^= crc;

			print_hex_break( data_buf+i, wrc, 16);
			
			i += wrc;
		}
    
		if ( hasWRP ) {
			PrintAndLog("Remaining write protected area:  (I %d | K %d | WRC %d | WRP %d  WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
			PrintAndLog("\nrow  | data");
			PrintAndLog("-----+------------------------------------------------");

					for (k=i; k < (i+wrp_len); ++k)
					data_buf[k] ^= crc;
			
			print_hex_break( data_buf+i, wrp_len, 16);
			
			i += wrp_len;
			
					// does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
			if( wrp_len == 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:  (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len);
		PrintAndLog("\nrow  | data");
		PrintAndLog("-----+------------------------------------------------");

				for ( k=i; k < (i+remain_seg_payload_len); ++k)
				data_buf[k] ^= crc;
		
		print_hex_break( data_buf+i, remain_seg_payload_len, 16);
    
		i += remain_seg_payload_len;
		
		PrintAndLog("-----+------------------------------------------------\n");

		// end with last segment
		if (segment_flag & 0x8) return 0;

	} // end for loop
		
		} else {

			// Data start point on unsegmented cards
			i = 8;

			wrp          = data_buf[7] & 0x0F;
			wrc          = (data_buf[7] & 0x07) >> 4;

			bool hasWRC = (wrc > 0);
			bool hasWRP = (wrp > wrc);
			int wrp_len = (wrp - wrc);
			int remain_seg_payload_len = (1024 - 22 - wrp);	// Any chance to get physical card size here!?

			PrintAndLog("Unsegmented card - WRP: %02u, WRC: %02u, RD: %01u",
				wrp,
				wrc,
				(data_buf[7] & 0x80) >> 7
			);

			if ( hasWRC ) {
				PrintAndLog("WRC protected area:   (I %d | WRC %d)", i, wrc);
				PrintAndLog("\nrow  | data");
				PrintAndLog("-----+------------------------------------------------");
				print_hex_break( data_buf+i, wrc, 16);
				i += wrc;
			}
    
			if ( hasWRP ) {
				PrintAndLog("Remaining write protected area:  (I %d | WRC %d | WRP %d | WRP_LEN %d)", i, wrc, wrp, wrp_len);
				PrintAndLog("\nrow  | data");
				PrintAndLog("-----+------------------------------------------------");
				print_hex_break( data_buf+i, wrp_len, 16);
				i += wrp_len;
			
				// does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
				if( wrp_len == 8 )
					PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4], data_buf[i-3], data_buf[i-2]);
			}
    
			PrintAndLog("Remaining segment payload:  (I %d | Remain LEN %d)", i, remain_seg_payload_len);
			PrintAndLog("\nrow  | data");
			PrintAndLog("-----+------------------------------------------------");
			print_hex_break( data_buf+i, remain_seg_payload_len, 16);
			i += remain_seg_payload_len;
		
			PrintAndLog("-----+------------------------------------------------\n");
		}
	}

	return 0;
}

int CmdLegicRFRead(const char *Cmd) {
	
	// params:
	// offset in data
	// number of bytes.
	char cmdp = param_getchar(Cmd, 0);
	if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
	
	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);
			if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
				PrintAndLog("Command execute timeout");
				fclose(f);
				return 1;
			}
			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);
		if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
				PrintAndLog("Command execute timeout");
				return 1;
		}
		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;
	}

	GetFromBigBuf(got, requested, offset);
	if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
		PrintAndLog("Command execute timeout");	
		return 1;
	}

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

//TODO: write a help text (iceman)
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;
}

//TODO: write a help text (iceman)
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;
}

//TODO: write a help text (iceman)
int CmdLegicRfRawWrite(const char *Cmd) {
	char answer;
    UsbCommand c = { CMD_RAW_WRITER_LEGIC_RF, {0,0,0} };
    int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
	if(res != 2) {
		PrintAndLog("Please specify the offset and value as two hex strings");
        return -1;
    }
	
	if (c.arg[0] == 0x05 || c.arg[0] == 0x06) {
		PrintAndLog("############# DANGER !! #############");
		PrintAndLog("# changing the DCF is irreversible  #");
		PrintAndLog("#####################################");
		PrintAndLog("do youe really want to continue? y(es) n(o)");		
		scanf(" %c", &answer);
		if (answer == 'y' || answer == 'Y') {
			SendCommand(&c);
			return 0;
		}
		return -1;
	}
	
	clearCommandBuffer();
    SendCommand(&c);
	return 0;
}

//TODO: write a help text (iceman)
int CmdLegicRfFill(const char *Cmd) {
    UsbCommand cmd = {CMD_WRITER_LEGIC_RF, {0,0,0} };
    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}};
	memset(c.d.asBytes, cmd.arg[2], 48);

	for(i = 0; i < 22; i++) {
		c.arg[0] = i*48;
		
		clearCommandBuffer();
		SendCommand(&c);
		WaitForResponse(CMD_ACK, NULL);
	}
	clearCommandBuffer();
    SendCommand(&cmd);
    return 0;
 }

int CmdLegicCalcCrc8(const char *Cmd){

	uint8_t *data;
	uint8_t cmdp = 0, uidcrc = 0, type=0;
	bool errors = false;
	int len = 0;
	
	while(param_getchar(Cmd, cmdp) != 0x00) {
		switch(param_getchar(Cmd, cmdp)) {
		case 'b':
		case 'B':
			data = malloc(len);
			if ( data == NULL ) {
				PrintAndLog("Can't allocate memory. exiting");
				errors = true;
				break;
			}			
			param_gethex_ex(Cmd, cmdp+1, data, &len);
			// if odd symbols, (hexbyte must be two symbols)
			if ( len & 1 ) errors = true;

			len >>= 1;	
			cmdp += 2;
			break;
		case 'u':
		case 'U':		 
			uidcrc = param_get8ex(Cmd, cmdp+1, 0, 16);
			cmdp += 2;
			break;
		case 'c':
		case 'C':
			type = param_get8ex(Cmd, cmdp+1, 0, 10);
			cmdp += 2;
			break;
		case 'h':
		case 'H':
			errors = true;
			break;
		default:
			PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
			errors = true;
			break;
		}
		if (errors) break;
	}
	//Validations
	if (errors){
		if (data != NULL) free(data);
		return usage_legic_calccrc8();
	}
	
	switch (type){
		case 16:
			PrintAndLog("LEGIC CRC16: %X", CRC16Legic(data, len, uidcrc));
			break;
		default:
			PrintAndLog("LEGIC CRC8: %X",  CRC8Legic(data, len) );
			break;
	}
	
	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)"},
	{"writeRaw",CmdLegicRfRawWrite,	0, "<address> <value> -- Write direct to address"},
	{"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	//-----------------------------------------------------------------------------
7fe9b0b7	10	#include "cmdhflegic.h"
3e134b4c	11
7fe9b0b7	12	static int CmdHelp(const char *Cmd);
7fe9b0b7	13
3b920280	14	int usage_legic_calccrc8(void){
3e134b4c	15	PrintAndLog("Calculates the legic crc8/crc16 on the input hexbytes.");
3b920280	16	PrintAndLog("There must be an even number of hexsymbols as input.");
3e134b4c	17	PrintAndLog("Usage: hf legic crc8 [h] b <hexbytes> u <uidcrc>");
3b920280	18	PrintAndLog("Options :");
3e134b4c	19	PrintAndLog(" b <hexbytes> : hex bytes");
3e134b4c	20	PrintAndLog(" u <uidcrc> : MCC hexbyte");
3b920280	21	PrintAndLog("");
3e134b4c	22	PrintAndLog("Samples :");
	23	PrintAndLog(" hf legic crc8 b deadbeef1122");
	24	PrintAndLog(" hf legic crc8 b deadbeef1122 u 9A");
3b920280	25	return 0;
	26	}
	27
e579e768	28	int usage_legic_load(void){
	29	PrintAndLog("It loads datasamples from the file `filename` to device memory");
	30	PrintAndLog("Usage: hf legic load <file name>");
	31	PrintAndLog(" sample: hf legic load filename");
	32	return 0;
	33	}
	34
cbdcc89a	35	int usage_legic_read(void){
	36	PrintAndLog("Read data from a legic tag.");
	37	PrintAndLog("Usage: hf legic read <offset> <num of bytes>");
	38	PrintAndLog("Options :");
	39	PrintAndLog(" <offset> : offset in data array to start download from");
	40	PrintAndLog(" <num of bytes> : number of bytes to download");
	41	PrintAndLog("");
	42	PrintAndLog(" sample: hf legic read");
	43	return 0;
	44	}
	45
669c1b80	46	/*
669c1b80	47	* Output BigBuf and deobfuscate LEGIC RF tag data.
cbdcc89a	48	* This is based on information given in the talk held
669c1b80	49	* by Henryk Ploetz and Karsten Nohl at 26c3
669c1b80	50	*/
3b920280	51	int CmdLegicDecode(const char *Cmd) {
d7fd9084	52	// Index for the bytearray.
	53	int i = 0;
	54	int k = 0, segmentNum;
52cf34c1	55	int segment_len = 0;
52cf34c1	56	int segment_flag = 0;
60bb5ef7	57	uint8_t stamp_len = 0;
52cf34c1	58	int crc = 0;
	59	int wrp = 0;
	60	int wrc = 0;
3e134b4c	61	uint8_t data_buf[1052]; // receiver buffer, should be 1024..
	62	char token_type[5];
	63	int dcf;
	64	int bIsSegmented = 0;
52cf34c1	65
cbdcc89a	66	// download EML memory, where the "legic read" command puts the data.
cbdcc89a	67	GetEMLFromBigBuf(data_buf, sizeof(data_buf), 0);
f7f844d0	68	if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
	69	PrintAndLog("Command execute timeout");
	70	return 1;
	71	}
	72
52cf34c1	73	// Output CDF System area (9 bytes) plus remaining header area (12 bytes)
3b920280	74	crc = data_buf[4];
	75	uint32_t calc_crc = CRC8Legic(data_buf, 4);
	76
52cf34c1	77	PrintAndLog("\nCDF: System Area");
aacb96d7	78	PrintAndLog("------------------------------------------------------");
3b920280	79	PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x %s",
52cf34c1	80	data_buf[0],
	81	data_buf[1],
	82	data_buf[2],
	83	data_buf[3],
3b920280	84	data_buf[4],
e579e768	85	(calc_crc == crc) ? "OK":"Fail"
52cf34c1	86	);
669c1b80	87
3e134b4c	88
	89	token_type[0] = 0;
	90	dcf = ((int)data_buf[6] << 8) \| (int)data_buf[5];
	91
	92	// New unwritten media?
	93	if(dcf == 0xFFFF) {
	94
	95	PrintAndLog("DCF: %d (%02x %02x), Token Type=NM (New Media)",
	96	dcf,
	97	data_buf[5],
	98	data_buf[6]
	99	);
	100
	101	} else if(dcf > 60000) { // Master token?
	102
	103	int fl = 0;
	104
	105	if(data_buf[6] == 0xec) {
	106	strncpy(token_type, "XAM", sizeof(token_type));
	107	fl = 1;
	108	stamp_len = 0x0c - (data_buf[5] >> 4);
	109	} else {
d7fd9084	110	switch (data_buf[5] & 0x7f) {
52cf34c1	111	case 0x00 ... 0x2f:
52cf34c1	112	strncpy(token_type, "IAM",sizeof(token_type));
3e134b4c	113	fl = (0x2f - (data_buf[5] & 0x7f)) + 1;
52cf34c1	114	break;
52cf34c1	115	case 0x30 ... 0x6f:
d7fd9084	116	strncpy(token_type, "SAM",sizeof(token_type));
3e134b4c	117	fl = (0x6f - (data_buf[5] & 0x7f)) + 1;
52cf34c1	118	break;
52cf34c1	119	case 0x70 ... 0x7f:
d7fd9084	120	strncpy(token_type, "GAM",sizeof(token_type));
3e134b4c	121	fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
52cf34c1	122	break;
	123	}
	124
	125	stamp_len = 0xfc - data_buf[6];
3e134b4c	126	}
52cf34c1	127
3e134b4c	128	PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u), OL=%02u, FL=%02u",
3e134b4c	129	dcf,
52cf34c1	130	data_buf[5],
	131	data_buf[6],
	132	token_type,
	133	(data_buf[5]&0x80)>>7,
3e134b4c	134	stamp_len,
3e134b4c	135	fl
52cf34c1	136	);
52cf34c1	137
3e134b4c	138	} else { // Is IM(-S) type of card...
	139
	140	if(data_buf[7] == 0x9F && data_buf[8] == 0xFF) {
	141	bIsSegmented = 1;
	142	strncpy(token_type, "IM-S", sizeof(token_type));
	143	} else {
	144	strncpy(token_type, "IM", sizeof(token_type));
	145	}
	146
	147	PrintAndLog("DCF: %d (%02x %02x), Token Type=%s (OLE=%01u)",
	148	dcf,
	149	data_buf[5],
	150	data_buf[6],
	151	token_type,
	152	(data_buf[5]&0x80)>>7
	153	);
	154	}
	155
	156	// Makes no sence to show this on blank media...
	157	if(dcf != 0xFFFF) {
	158
	159	if(bIsSegmented) {
	160	PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, SSC=%02x",
52cf34c1	161	data_buf[7]&0x0f,
	162	(data_buf[7]&0x70)>>4,
	163	(data_buf[7]&0x80)>>7,
52cf34c1	164	data_buf[8]
52cf34c1	165	);
3e134b4c	166	}
52cf34c1	167
3e134b4c	168	// Header area is only available on IM-S cards, on master tokens this data is the master token data itself
	169	if(bIsSegmented \|\| dcf > 60000) {
	170	if(dcf > 60000) {
	171	PrintAndLog("Master token data");
	172	PrintAndLog("%s", sprint_hex(data_buf+8, 14));
	173	} else {
52cf34c1	174	PrintAndLog("Remaining Header Area");
52cf34c1	175	PrintAndLog("%s", sprint_hex(data_buf+9, 13));
3e134b4c	176	}
	177	}
	178	}
	179
d7fd9084	180
e579e768	181	uint8_t segCrcBytes[8] = {0x00};
	182	uint32_t segCalcCRC = 0;
	183	uint32_t segCRC = 0;
d7fd9084	184
aacb96d7	185
3e134b4c	186	// Data card?
3e134b4c	187	if(dcf <= 60000) {
cbdcc89a	188
d7fd9084	189	PrintAndLog("\nADF: User Area");
aacb96d7	190	PrintAndLog("------------------------------------------------------");
3e134b4c	191
	192	if(bIsSegmented) {
	193
	194	// Data start point on segmented cards
d7fd9084	195	i = 22;
3e134b4c	196
	197	// decode segments
	198	for (segmentNum=1; segmentNum < 128; segmentNum++ )
	199	{
52cf34c1	200	segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc);
52cf34c1	201	segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4;
52cf34c1	202	wrp = (data_buf[i+2]^crc);
	203	wrc = ((data_buf[i+3]^crc)&0x70)>>4;
	204
d7fd9084	205	bool hasWRC = (wrc > 0);
	206	bool hasWRP = (wrp > wrc);
	207	int wrp_len = (wrp - wrc);
	208	int remain_seg_payload_len = (segment_len - wrp - 5);
e579e768	209
d7fd9084	210	// validate segment-crc
	211	segCrcBytes[0]=data_buf[0]; //uid0
	212	segCrcBytes[1]=data_buf[1]; //uid1
	213	segCrcBytes[2]=data_buf[2]; //uid2
	214	segCrcBytes[3]=data_buf[3]; //uid3
	215	segCrcBytes[4]=(data_buf[i]^crc); //hdr0
e579e768	216	segCrcBytes[5]=(data_buf[i+1]^crc); //hdr1
	217	segCrcBytes[6]=(data_buf[i+2]^crc); //hdr2
	218	segCrcBytes[7]=(data_buf[i+3]^crc); //hdr3
d7fd9084	219
e579e768	220	segCalcCRC = CRC8Legic(segCrcBytes, 8);
d7fd9084	221	segCRC = data_buf[i+4]^crc;
e579e768	222
aacb96d7	223	PrintAndLog("Segment %02u \nraw header \| 0x%02X 0x%02X 0x%02X 0x%02X \nSegment len: %u, Flag: 0x%X (valid:%01u, last:%01u), WRP: %02u, WRC: %02u, RD: %01u, CRC: 0x%02X (%s)",
d7fd9084	224	segmentNum,
52cf34c1	225	data_buf[i]^crc,
	226	data_buf[i+1]^crc,
	227	data_buf[i+2]^crc,
	228	data_buf[i+3]^crc,
9827020a	229	segment_len,
52cf34c1	230	segment_flag,
d7fd9084	231	(segment_flag & 0x4) >> 2,
d7fd9084	232	(segment_flag & 0x8) >> 3,
52cf34c1	233	wrp,
52cf34c1	234	wrc,
d7fd9084	235	((data_buf[i+3]^crc) & 0x80) >> 7,
e579e768	236	segCRC,
e579e768	237	( segCRC == segCalcCRC ) ? "OK" : "fail"
52cf34c1	238	);
52cf34c1	239
3b920280	240	i += 5;
669c1b80	241
d7fd9084	242	if ( hasWRC ) {
d7fd9084	243	PrintAndLog("WRC protected area: (I %d \| K %d\| WRC %d)", i, k, wrc);
aacb96d7	244	PrintAndLog("\nrow \| data");
aacb96d7	245	PrintAndLog("-----+------------------------------------------------");
3e134b4c	246
3e134b4c	247	for ( k=i; k < (i+wrc); ++k)
a182a680	248	data_buf[k] ^= crc;
3e134b4c	249
9827020a	250	print_hex_break( data_buf+i, wrc, 16);
3b920280	251
3b920280	252	i += wrc;
52cf34c1	253	}
669c1b80	254
d7fd9084	255	if ( hasWRP ) {
d7fd9084	256	PrintAndLog("Remaining write protected area: (I %d \| K %d \| WRC %d \| WRP %d WRP_LEN %d)",i, k, wrc, wrp, wrp_len);
aacb96d7	257	PrintAndLog("\nrow \| data");
aacb96d7	258	PrintAndLog("-----+------------------------------------------------");
d7fd9084	259
3e134b4c	260	for (k=i; k < (i+wrp_len); ++k)
9827020a	261	data_buf[k] ^= crc;
3b920280	262
9827020a	263	print_hex_break( data_buf+i, wrp_len, 16);
3b920280	264
d7fd9084	265	i += wrp_len;
d7fd9084	266
3e134b4c	267	// does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
9827020a	268	if( wrp_len == 8 )
9827020a	269	PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4]^crc, data_buf[i-3]^crc, data_buf[i-2]^crc);
52cf34c1	270	}
669c1b80	271
a182a680	272	PrintAndLog("Remaining segment payload: (I %d \| K %d \| Remain LEN %d)", i, k, remain_seg_payload_len);
aacb96d7	273	PrintAndLog("\nrow \| data");
aacb96d7	274	PrintAndLog("-----+------------------------------------------------");
3e134b4c	275
3e134b4c	276	for ( k=i; k < (i+remain_seg_payload_len); ++k)
9827020a	277	data_buf[k] ^= crc;
3b920280	278
9827020a	279	print_hex_break( data_buf+i, remain_seg_payload_len, 16);
669c1b80	280
d7fd9084	281	i += remain_seg_payload_len;
d7fd9084	282
aacb96d7	283	PrintAndLog("-----+------------------------------------------------\n");
a182a680	284
52cf34c1	285	// end with last segment
	286	if (segment_flag & 0x8) return 0;
	287
	288	} // end for loop
3e134b4c	289
	290	} else {
	291
	292	// Data start point on unsegmented cards
	293	i = 8;
	294
	295	wrp = data_buf[7] & 0x0F;
	296	wrc = (data_buf[7] & 0x07) >> 4;
	297
	298	bool hasWRC = (wrc > 0);
	299	bool hasWRP = (wrp > wrc);
	300	int wrp_len = (wrp - wrc);
	301	int remain_seg_payload_len = (1024 - 22 - wrp); // Any chance to get physical card size here!?
	302
	303	PrintAndLog("Unsegmented card - WRP: %02u, WRC: %02u, RD: %01u",
	304	wrp,
	305	wrc,
	306	(data_buf[7] & 0x80) >> 7
	307	);
	308
	309	if ( hasWRC ) {
	310	PrintAndLog("WRC protected area: (I %d \| WRC %d)", i, wrc);
	311	PrintAndLog("\nrow \| data");
	312	PrintAndLog("-----+------------------------------------------------");
	313	print_hex_break( data_buf+i, wrc, 16);
	314	i += wrc;
	315	}
	316
	317	if ( hasWRP ) {
	318	PrintAndLog("Remaining write protected area: (I %d \| WRC %d \| WRP %d \| WRP_LEN %d)", i, wrc, wrp, wrp_len);
	319	PrintAndLog("\nrow \| data");
	320	PrintAndLog("-----+------------------------------------------------");
	321	print_hex_break( data_buf+i, wrp_len, 16);
	322	i += wrp_len;
	323
	324	// does this one work? (Answer: Only if KGH/BGH is used with BCD encoded card number! So maybe this will show just garbage...)
	325	if( wrp_len == 8 )
	326	PrintAndLog("Card ID: %2X%02X%02X", data_buf[i-4], data_buf[i-3], data_buf[i-2]);
	327	}
	328
	329	PrintAndLog("Remaining segment payload: (I %d \| Remain LEN %d)", i, remain_seg_payload_len);
	330	PrintAndLog("\nrow \| data");
	331	PrintAndLog("-----+------------------------------------------------");
	332	print_hex_break( data_buf+i, remain_seg_payload_len, 16);
	333	i += remain_seg_payload_len;
	334
	335	PrintAndLog("-----+------------------------------------------------\n");
	336	}
	337	}
	338
52cf34c1	339	return 0;
669c1b80	340	}
41dab153	341
52cf34c1	342	int CmdLegicRFRead(const char *Cmd) {
cbdcc89a	343
	344	// params:
	345	// offset in data
	346	// number of bytes.
	347	char cmdp = param_getchar(Cmd, 0);
	348	if ( cmdp == 'H' \|\| cmdp == 'h' ) return usage_legic_read();
	349
52cf34c1	350	int byte_count=0, offset=0;
	351	sscanf(Cmd, "%i %i", &offset, &byte_count);
	352	if(byte_count == 0) byte_count = -1;
	353	if(byte_count + offset > 1024) byte_count = 1024 - offset;
	354
	355	UsbCommand c= {CMD_READER_LEGIC_RF, {offset, byte_count, 0}};
	356	clearCommandBuffer();
	357	SendCommand(&c);
	358	return 0;
41dab153	359	}
3612a8a8	360
52cf34c1	361	int CmdLegicLoad(const char *Cmd) {
b915fda3	362
52cf34c1	363	char cmdp = param_getchar(Cmd, 0);
e579e768	364	if ( cmdp == 'H' \|\| cmdp == 'h' \|\| cmdp == 0x00) return usage_legic_load();
b915fda3	365
e579e768	366	char filename[FILE_PATH_SIZE] = {0x00};
	367	int len = strlen(Cmd);
	368
b915fda3	369	if (len > FILE_PATH_SIZE) {
	370	PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
	371	return 0;
	372	}
	373	memcpy(filename, Cmd, len);
	374
	375	FILE *f = fopen(filename, "r");
3612a8a8	376	if(!f) {
	377	PrintAndLog("couldn't open '%s'", Cmd);
	378	return -1;
	379	}
52cf34c1	380
52cf34c1	381	char line[80];
810f5379	382	int offset = 0;
c6e0a2eb	383	uint8_t data[USB_CMD_DATA_SIZE] = {0x00};
	384	int index = 0;
	385	int totalbytes = 0;
52cf34c1	386	while ( fgets(line, sizeof(line), f) ) {
3612a8a8	387	int res = sscanf(line, "%x %x %x %x %x %x %x %x",
c6e0a2eb	388	(unsigned int *)&data[index],
	389	(unsigned int *)&data[index + 1],
	390	(unsigned int *)&data[index + 2],
	391	(unsigned int *)&data[index + 3],
	392	(unsigned int *)&data[index + 4],
	393	(unsigned int *)&data[index + 5],
	394	(unsigned int *)&data[index + 6],
	395	(unsigned int *)&data[index + 7]);
e7d099dc	396
3612a8a8	397	if(res != 8) {
	398	PrintAndLog("Error: could not read samples");
	399	fclose(f);
	400	return -1;
	401	}
c6e0a2eb	402	index += res;
	403
	404	if ( index == USB_CMD_DATA_SIZE ){
	405	// PrintAndLog("sent %d \| %d \| %d", index, offset, totalbytes);
	406	UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
	407	memcpy(c.d.asBytes, data, sizeof(data));
	408	clearCommandBuffer();
	409	SendCommand(&c);
d7fd9084	410	if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
	411	PrintAndLog("Command execute timeout");
	412	fclose(f);
	413	return 1;
	414	}
c6e0a2eb	415	offset += index;
	416	totalbytes += index;
	417	index = 0;
	418	}
3612a8a8	419	}
3612a8a8	420	fclose(f);
c6e0a2eb	421
	422	// left over bytes?
	423	if ( index != 0 ) {
	424	UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
	425	memcpy(c.d.asBytes, data, 8);
	426	clearCommandBuffer();
	427	SendCommand(&c);
d7fd9084	428	if ( !WaitForResponseTimeout(CMD_ACK, NULL, 1500)){
	429	PrintAndLog("Command execute timeout");
	430	return 1;
	431	}
c6e0a2eb	432	totalbytes += index;
	433	}
	434
	435	PrintAndLog("loaded %u samples", totalbytes);
3612a8a8	436	return 0;
	437	}
	438
52cf34c1	439	int CmdLegicSave(const char *Cmd) {
	440	int requested = 1024;
	441	int offset = 0;
	442	int delivered = 0;
	443	char filename[FILE_PATH_SIZE];
	444	uint8_t got[1024] = {0x00};
	445
	446	sscanf(Cmd, " %s %i %i", filename, &requested, &offset);
	447
	448	/* If no length given save entire legic read buffer */
	449	/* round up to nearest 8 bytes so the saved data can be used with legicload */
e7d099dc	450	if (requested == 0)
52cf34c1	451	requested = 1024;
52cf34c1	452
	453	if (requested % 8 != 0) {
	454	int remainder = requested % 8;
	455	requested = requested + 8 - remainder;
	456	}
	457
	458	if (offset + requested > sizeof(got)) {
	459	PrintAndLog("Tried to read past end of buffer, <bytes> + <offset> > 1024");
	460	return 0;
	461	}
	462
d7fd9084	463	GetFromBigBuf(got, requested, offset);
f7f844d0	464	if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2000)){
aacb96d7	465	PrintAndLog("Command execute timeout");
f7f844d0	466	return 1;
f7f844d0	467	}
52cf34c1	468
aacb96d7	469	FILE *f = fopen(filename, "w");
	470	if(!f) {
	471	PrintAndLog("couldn't open '%s'", Cmd+1);
	472	return -1;
	473	}
	474
52cf34c1	475	for (int j = 0; j < requested; j += 8) {
52cf34c1	476	fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n",
c6e0a2eb	477	got[j+0], got[j+1], got[j+2], got[j+3],
c6e0a2eb	478	got[j+4], got[j+5], got[j+6], got[j+7]
52cf34c1	479	);
	480	delivered += 8;
	481	if (delivered >= requested) break;
	482	}
	483
	484	fclose(f);
	485	PrintAndLog("saved %u samples", delivered);
	486	return 0;
3612a8a8	487	}
3612a8a8	488
f7f844d0	489	//TODO: write a help text (iceman)
52cf34c1	490	int CmdLegicRfSim(const char *Cmd) {
3b920280	491	UsbCommand c = {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
52cf34c1	492	sscanf(Cmd, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
	493	clearCommandBuffer();
	494	SendCommand(&c);
	495	return 0;
3612a8a8	496	}
3612a8a8	497
f7f844d0	498	//TODO: write a help text (iceman)
52cf34c1	499	int CmdLegicRfWrite(const char *Cmd) {
52cf34c1	500	UsbCommand c = {CMD_WRITER_LEGIC_RF};
125a98a1	501	int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
3612a8a8	502	if(res != 2) {
	503	PrintAndLog("Please specify the offset and length as two hex strings");
	504	return -1;
	505	}
52cf34c1	506	clearCommandBuffer();
3612a8a8	507	SendCommand(&c);
	508	return 0;
	509	}
	510
3e134b4c	511	//TODO: write a help text (iceman)
	512	int CmdLegicRfRawWrite(const char *Cmd) {
	513	char answer;
	514	UsbCommand c = { CMD_RAW_WRITER_LEGIC_RF, {0,0,0} };
	515	int res = sscanf(Cmd, " 0x%"llx" 0x%"llx, &c.arg[0], &c.arg[1]);
	516	if(res != 2) {
	517	PrintAndLog("Please specify the offset and value as two hex strings");
	518	return -1;
	519	}
	520
	521	if (c.arg[0] == 0x05 \|\| c.arg[0] == 0x06) {
	522	PrintAndLog("############# DANGER !! #############");
	523	PrintAndLog("# changing the DCF is irreversible #");
	524	PrintAndLog("#####################################");
	525	PrintAndLog("do youe really want to continue? y(es) n(o)");
	526	scanf(" %c", &answer);
	527	if (answer == 'y' \|\| answer == 'Y') {
	528	SendCommand(&c);
	529	return 0;
	530	}
	531	return -1;
	532	}
	533
	534	clearCommandBuffer();
	535	SendCommand(&c);
	536	return 0;
	537	}
	538
	539	//TODO: write a help text (iceman)
52cf34c1	540	int CmdLegicRfFill(const char *Cmd) {
3e134b4c	541	UsbCommand cmd = {CMD_WRITER_LEGIC_RF, {0,0,0} };
1a07fd51	542	int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]);
3612a8a8	543	if(res != 3) {
	544	PrintAndLog("Please specify the offset, length and value as two hex strings");
	545	return -1;
	546	}
	547
	548	int i;
52cf34c1	549	UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
ba4ad25b	550	memset(c.d.asBytes, cmd.arg[2], 48);
3e134b4c	551
52cf34c1	552	for(i = 0; i < 22; i++) {
52cf34c1	553	c.arg[0] = i*48;
3e134b4c	554
3e134b4c	555	clearCommandBuffer();
52cf34c1	556	SendCommand(&c);
3e134b4c	557	WaitForResponse(CMD_ACK, NULL);
52cf34c1	558	}
52cf34c1	559	clearCommandBuffer();
3612a8a8	560	SendCommand(&cmd);
	561	return 0;
	562	}
	563
3b920280	564	int CmdLegicCalcCrc8(const char *Cmd){
3b920280	565
3e134b4c	566	uint8_t *data;
	567	uint8_t cmdp = 0, uidcrc = 0, type=0;
	568	bool errors = false;
	569	int len = 0;
3b920280	570
3e134b4c	571	while(param_getchar(Cmd, cmdp) != 0x00) {
	572	switch(param_getchar(Cmd, cmdp)) {
	573	case 'b':
	574	case 'B':
	575	data = malloc(len);
	576	if ( data == NULL ) {
	577	PrintAndLog("Can't allocate memory. exiting");
	578	errors = true;
	579	break;
	580	}
	581	param_gethex_ex(Cmd, cmdp+1, data, &len);
	582	// if odd symbols, (hexbyte must be two symbols)
	583	if ( len & 1 ) errors = true;
	584
	585	len >>= 1;
	586	cmdp += 2;
	587	break;
	588	case 'u':
	589	case 'U':
	590	uidcrc = param_get8ex(Cmd, cmdp+1, 0, 16);
	591	cmdp += 2;
	592	break;
	593	case 'c':
	594	case 'C':
	595	type = param_get8ex(Cmd, cmdp+1, 0, 10);
	596	cmdp += 2;
	597	break;
	598	case 'h':
	599	case 'H':
	600	errors = true;
	601	break;
	602	default:
	603	PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
	604	errors = true;
	605	break;
	606	}
	607	if (errors) break;
	608	}
	609	//Validations
	610	if (errors){
	611	if (data != NULL) free(data);
	612	return usage_legic_calccrc8();
	613	}
	614
	615	switch (type){
	616	case 16:
	617	PrintAndLog("LEGIC CRC16: %X", CRC16Legic(data, len, uidcrc));
	618	break;
	619	default:
	620	PrintAndLog("LEGIC CRC8: %X", CRC8Legic(data, len) );
	621	break;
eb5206bd	622	}
3b920280	623
3b920280	624	free(data);
	625	return 0;
	626	}
	627
52cf34c1	628	static command_t CommandTable[] = {
3b920280	629	{"help", CmdHelp, 1, "This help"},
	630	{"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"},
	631	{"read", CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"},
	632	{"save", CmdLegicSave, 0, "<filename> [<length>] -- Store samples"},
	633	{"load", CmdLegicLoad, 0, "<filename> -- Restore samples"},
	634	{"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"},
	635	{"write", CmdLegicRfWrite,0, "<offset> <length> -- Write sample buffer (user after load or read)"},
3e134b4c	636	{"writeRaw",CmdLegicRfRawWrite, 0, "<address> <value> -- Write direct to address"},
3b920280	637	{"fill", CmdLegicRfFill, 0, "<offset> <length> <value> -- Fill/Write tag with constant value"},
3b920280	638	{"crc8", CmdLegicCalcCrc8, 1, "Calculate Legic CRC8 over given hexbytes"},
52cf34c1	639	{NULL, NULL, 0, NULL}
	640	};
	641
	642	int CmdHFLegic(const char *Cmd) {
	643	clearCommandBuffer();
	644	CmdsParse(CommandTable, Cmd);
	645	return 0;
	646	}
	647
	648	int CmdHelp(const char *Cmd) {
	649	CmdsHelp(CommandTable);
	650	return 0;
	651	}