X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/395ec4e99ca757472fa962345552e3f01ea0c154..fada2feaf782ec47909886e86219ad49818e603a:/client/cmdhflegic.c?ds=inline

diff --git a/client/cmdhflegic.c b/client/cmdhflegic.c
index 4e52c35c..2200a15b 100644
--- a/client/cmdhflegic.c
+++ b/client/cmdhflegic.c
@@ -7,228 +7,452 @@
 //-----------------------------------------------------------------------------
 // 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"
+
 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}
-};
+#define SESSION_IV 0x55
+#define MAX_LENGTH 1024	
 
-int CmdHFLegic(const char *Cmd)
-{
-  CmdsParse(CommandTable, Cmd);
-  return 0;
+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> c <crc type>");
+	PrintAndLog("Options:");
+	PrintAndLog("      h             : this help");
+	PrintAndLog("      b <hexbytes>  : hex bytes");
+	PrintAndLog("      u <uidcrc>    : MCC hexbyte");
+	PrintAndLog("      c <crc type>  : 8|16 bit crc size");
+	PrintAndLog("");
+	PrintAndLog("Samples:");
+	PrintAndLog("      hf legic crc8 b deadbeef1122");
+	PrintAndLog("      hf legic crc8 b deadbeef1122 u 9A c 16");
+	return 0;
 }
-
-int CmdHelp(const char *Cmd)
-{
-  CmdsHelp(CommandTable);
-  return 0;
+int usage_legic_load(void){
+	PrintAndLog("It loads datasamples from the file `filename` to device memory");
+	PrintAndLog("Usage:  hf legic load [h] <file name>");
+	PrintAndLog("Options:");
+	PrintAndLog("  h             : this help");
+	PrintAndLog("  <filename>    : Name of file to load");
+	PrintAndLog("");
+	PrintAndLog("Samples:");
+	PrintAndLog("      hf legic load filename");
+	return 0;
+}
+int usage_legic_read(void){	
+	PrintAndLog("Read data from a legic tag.");
+	PrintAndLog("Usage:  hf legic read [h] <offset> <length> <IV>");
+	PrintAndLog("Options:");
+	PrintAndLog("  h             : this help");
+	PrintAndLog("  <offset>      : offset in data array to start download from");
+	PrintAndLog("  <length>      : number of bytes to download");
+	PrintAndLog("  <IV>          : (optional) Initialization vector to use (ODD and 7bits)");
+	PrintAndLog("");
+	PrintAndLog("Samples:");
+	PrintAndLog("      hf legic read");
+	PrintAndLog("      hf legic read 10 4");
+	return 0;
+}
+int usage_legic_sim(void){
+	PrintAndLog("Missing help text.");
+	return 0;
+}
+int usage_legic_write(void){
+	PrintAndLog(" Write sample buffer to a legic tag. (use after load or read)");
+	PrintAndLog("Usage:  hf legic write [h] <offset> <length> <IV>");
+	PrintAndLog("Options:");
+	PrintAndLog("  h             : this help");
+	PrintAndLog("  <offset>      : offset in data array to start writing from");
+	PrintAndLog("  <length>      : number of bytes to write");
+	PrintAndLog("  <IV>          : (optional) Initialization vector to use (ODD and 7bits)");
+	PrintAndLog("");
+	PrintAndLog("Samples:");
+	PrintAndLog("      hf legic write");
+	PrintAndLog("      hf legic write 10 4");
+	return 0;
+}
+int usage_legic_rawwrite(void){
+	PrintAndLog("Write raw data direct to a specific address on legic tag.");
+	PrintAndLog("Usage:  hf legic writeraw [h] <address> <value> <IV>");
+	PrintAndLog("Options:");
+	PrintAndLog("  h             : this help");
+	PrintAndLog("  <address>     : address to write to");
+	PrintAndLog("  <value>       : value to write");
+	PrintAndLog("  <IV>          : (optional) Initialization vector to use (ODD and 7bits)");
+	PrintAndLog("");
+	PrintAndLog("Samples:");
+	PrintAndLog("      hf legic writeraw");
+	PrintAndLog("      hf legic writeraw 10 4");
+	return 0;
+}
+int usage_legic_fill(void){
+	PrintAndLog("Missing help text.");
+	return 0;
+}
+int usage_legic_info(void){
+	PrintAndLog("Read info from a legic tag.");
+	PrintAndLog("Usage:  hf legic info [h]");
+	PrintAndLog("Options:");
+	PrintAndLog("  h             : this help");
+	PrintAndLog("");
+	PrintAndLog("Samples:");
+	PrintAndLog("      hf legic info");
+	return 0;
 }
-
 /*
  *  Output BigBuf and deobfuscate LEGIC RF tag data.
- *   This is based on information given in the talk held
+ *  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, j, 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[1052]; // 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)
-  
-  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];
+int CmdLegicDecode(const char *Cmd) {
+
+	int i = 0, k = 0, segmentNum = 0, segment_len = 0, segment_flag = 0;
+	int crc = 0, wrp = 0, wrc = 0;
+	uint8_t stamp_len = 0;
+	uint8_t data_buf[1024]; // receiver buffer
+	char token_type[5] = {0,0,0,0,0};
+	int dcf = 0;
+	int bIsSegmented = 0;
+
+	// copy data from proxmark into buffer
+	GetFromBigBuf(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" 
+	);
  
-  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] = ' ';
-      };
+
+	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] = {0,0,0,0,0,0,0,0};
+	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;
     
-      out_string[j] = '\0';
+				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;
+				}
     
-      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);
-      }
-    }
+				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:");
-    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] = ' ';
-    };
+				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);
     
-    out_string[j] = '\0';
+				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] & 0x70) >> 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;
+			}
     
-    PrintAndLog("%s", out_string);
+			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]);
+			}
     
-    // end with last segment
-    if (segment_flag & 0x8)
-      return 0;
-  };
-  return 0;
+			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)
-{
-  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 CmdLegicRFRead(const char *Cmd) {
 
-int CmdLegicLoad(const char *Cmd)
-{
-	char filename[FILE_PATH_SIZE] = {0x00};
-	int len = 0;
+	// params:
+	// offset in data
+	// number of bytes.
+	char cmdp = param_getchar(Cmd, 0);
+	if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_read();
 	
-	if (param_getchar(Cmd, 0) == 'h' || param_getchar(Cmd, 0)== 0x00) {
-		PrintAndLog("It loads datasamples from the file `filename`");
-		PrintAndLog("Usage:  hf legic load <file name>");
-		PrintAndLog(" sample: hf legic load filename");
-		return 0;
+	uint32_t offset = 0, len = 0, IV = 1;
+	sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
+
+	// OUT-OF-BOUNDS check
+	if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset;
+	
+	if ( (IV & 0x7F) != IV ){
+		IV &= 0x7F;
+		PrintAndLog("Truncating IV to 7bits");
+	}
+	if ( (IV & 1) == 0 ){
+		IV |= 0x01;  // IV must be odd
+		PrintAndLog("LSB of IV must be SET");	
 	}
+	PrintAndLog("Current IV: 0x%02x", IV);
+	
+	// get some  prng bytes from 
+	uint8_t temp[32];
+	legic_prng_init(IV);
+	for ( uint8_t j = 0; j < sizeof(temp); ++j) {
+		temp[j] = legic_prng_get_bit(1);
+		legic_prng_forward(1);
+		//PrintAndLog("PRNG: %s", sprint_hex(temp, sizeof(temp)));
+	}
+	PrintAndLog("PRNG: %s", sprint_bin(temp, sizeof(temp)));
+		
+	UsbCommand c = {CMD_READER_LEGIC_RF, {offset, len, IV}};
+	clearCommandBuffer();
+	SendCommand(&c);
+	UsbCommand resp;
+	if (WaitForResponseTimeout(CMD_ACK, &resp, 2000)) {
+		uint8_t isOK = resp.arg[0] & 0xFF;
+		uint16_t len = resp.arg[1] & 0x3FF;
+		 if ( isOK ) {
+			PrintAndLog("use 'hf legic decode'");
+		 }
+			uint8_t *data = resp.d.asBytes;
+			PrintAndLog("\nData        |");
+			PrintAndLog("-----------------------------");
+			PrintAndLog(" %s|\n", sprint_hex(data, len));
+		// }
+	} else {
+		PrintAndLog("command execution time out");
+		return 1;
+	}
+	return 0;
+}
+
+int CmdLegicLoad(const char *Cmd) {
 
-	len = strlen(Cmd);	
+// iceman: potential bug, where all filepaths or filename which starts with H or h will print the helptext :)	
+	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;
@@ -240,109 +464,219 @@ int CmdLegicLoad(const char *Cmd)
         PrintAndLog("couldn't open '%s'", Cmd);
         return -1;
     }
-    char line[80]; int offset = 0; unsigned int data[8];
-    while(fgets(line, sizeof(line), f)) {
+	
+    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", 
-            &data[0], &data[1], &data[2], &data[3],
-            &data[4], &data[5], &data[6], &data[7]);
+            (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;
         }
-        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, NULL);
-        offset += 8;
+		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);
-    PrintAndLog("loaded %u samples", offset);
+	
+	// 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];
-  
-  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 CmdLegicSave(const char *Cmd) {
+	int requested = 1024;
+	int offset = 0;
+	int delivered = 0;
+	char filename[FILE_PATH_SIZE] = {0x00};
+	uint8_t got[1024] = {0x00};
+
+	memset(filename, 0, FILE_PATH_SIZE);
+	
+	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;
 }
 
-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, " %"lli" %"lli" %"lli, &c.arg[0], &c.arg[1], &c.arg[2]);
-   SendCommand(&c);
-   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;
 }
 
-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");
+int CmdLegicRfWrite(const char *Cmd) {
+
+	// params:
+	// offset - in tag memory
+	// length - num of bytes to be written
+	// IV - initialisation vector
+	
+	char cmdp = param_getchar(Cmd, 0);
+	if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_write();
+	
+	uint32_t offset = 0, len = 0, IV = 0;
+	
+    UsbCommand c = {CMD_WRITER_LEGIC_RF, {0,0,0}};
+    int res = sscanf(Cmd, "%x %x %x", &offset, &len, &IV);
+	if(res < 2) {
+		PrintAndLog("Please specify the offset and length as two hex strings and, optionally, the IV also as an hex string");
         return -1;
     }
+
+	// OUT-OF-BOUNDS check
+	if(len + offset > MAX_LENGTH) len = MAX_LENGTH - offset;
+
+	if ( (IV & 0x7F) != IV ){
+		IV &= 0x7F;
+		PrintAndLog("Truncating IV to 7bits");
+	}
+	if ( (IV & 1) == 0 ){
+		IV |= 0x01;  // IV must be odd
+		PrintAndLog("LSB of IV must be SET");	
+	}
+	
+	PrintAndLog("Current IV: 0x%02x", IV);
+	
+	c.arg[0] = offset;
+	c.arg[1] = len;
+    c.arg[2] = IV;
+	
+	clearCommandBuffer();
     SendCommand(&c);
     return 0;
 }
 
-int CmdLegicRfFill(const char *Cmd)
-{
-    UsbCommand cmd ={CMD_WRITER_LEGIC_RF};
+int CmdLegicRfRawWrite(const char *Cmd) {
+
+	char cmdp = param_getchar(Cmd, 0);
+	if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_rawwrite();
+	
+	uint32_t address = 0, data = 0, IV = 0;	
+	char answer;
+
+    UsbCommand c = { CMD_RAW_WRITER_LEGIC_RF, {0,0,0} };
+    int res = sscanf(Cmd, "%x %x %x", &address, &data, &IV);
+	if(res < 2)
+		return usage_legic_rawwrite();
+
+	// OUT-OF-BOUNDS check
+	if(address > MAX_LENGTH)
+		return usage_legic_rawwrite();
+	
+	if ( (IV & 0x7F) != IV ){
+		IV &= 0x7F;
+		PrintAndLog("Truncating IV to 7bits");
+	}
+	if ( (IV & 1) == 0 ){
+		IV |= 0x01;  // IV must be odd
+		PrintAndLog("LSB of IV must be SET");	
+	}
+	PrintAndLog("Current IV: 0x%02x", IV);
+
+	c.arg[0] = address;
+	c.arg[1] = data;
+    c.arg[2] = IV;
+	
+	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)");		
+		if (scanf(" %c", &answer) > 0 && (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");
@@ -350,16 +684,200 @@ int CmdLegicRfFill(const char *Cmd)
     }
 
     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);
-    }
+    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;
  }
 
+void static calc4(uint8_t *cmd, uint8_t len){
+	crc_t crc;
+ 	//crc_init_ref(&crc, 4, 0x19 >> 1, 0x5, 0, TRUE, TRUE);
+	crc_init(&crc, 4, 0x19 >> 1, 0x5, 0);
+
+	crc_clear(&crc);
+	crc_update(&crc, 1, 1); /* CMD_READ */
+	crc_update(&crc, cmd[0], 8);
+	crc_update(&crc, cmd[1], 8);
+	printf("crc4 %X\n", reflect(crc_finish(&crc), 4) ) ;
+
+	crc_clear(&crc);
+	crc_update(&crc, 1, 1); /* CMD_READ */
+	crc_update(&crc, cmd[0], 8);
+	crc_update(&crc, cmd[1], 8);
+	printf("crc4 %X\n",  crc_finish(&crc) ) ;
+
+	printf("---- old ---\n");
+	crc_update2(&crc, 1, 1); /* CMD_READ */
+	crc_update2(&crc, cmd[0], 8);
+	crc_update2(&crc, cmd[1], 8);
+	printf("crc4 %X \n", reflect(crc_finish(&crc), 4) ) ;
+
+	
+	crc_clear(&crc);
+	crc_update2(&crc, 1, 1); /* CMD_READ */
+	crc_update2(&crc, cmd[0], 8);
+	crc_update2(&crc, cmd[1], 8);
+	printf("crc4 %X\n",  crc_finish(&crc) ) ;
+}	
+ 
+int CmdLegicCalcCrc8(const char *Cmd){
+
+	uint8_t *data = NULL;
+	uint8_t cmdp = 0, uidcrc = 0, type=0;
+	bool errors = false;
+	int len = 0;
+	int bg, en;
+	
+	while(param_getchar(Cmd, cmdp) != 0x00) {
+		switch(param_getchar(Cmd, cmdp)) {
+		case 'b':
+		case 'B':
+			// peek at length of the input string so we can
+			// figure out how many elements to malloc in "data"
+			bg=en=0;
+			if (param_getptr(Cmd, &bg, &en, cmdp+1)) {
+				errors = true;
+				break;
+			}
+			len = (en - bg + 1);
+
+			// check that user entered even number of characters
+			// for hex data string
+			if (len & 1) {
+				errors = true;
+				break;
+			}
+
+			// it's possible for user to accidentally enter "b" parameter
+			// more than once - we have to clean previous malloc
+			if (data) free(data);
+			data = malloc(len >> 1);
+			if ( data == NULL ) {
+				PrintAndLog("Can't allocate memory. exiting");
+				errors = true;
+				break;
+			}
+			
+			if (param_gethex(Cmd, cmdp+1, data, len)) {
+				errors = true;
+				break;
+			}
+
+			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) free(data);
+		return usage_legic_calccrc8();
+	}
+	
+	switch (type){
+		case 16:
+			PrintAndLog("Legic crc16: %X", CRC16Legic(data, len, uidcrc));
+			break;
+		case 4:
+			calc4(data, 0);
+			break;
+		default:
+			PrintAndLog("Legic crc8: %X",  CRC8Legic(data, len) );
+			break;
+	}
+	
+	if (data) free(data);
+	return 0;
+} 
+ 
+int HFLegicInfo(const char *Cmd, bool verbose) {
+
+	char cmdp = param_getchar(Cmd, 0);
+	if ( cmdp == 'H' || cmdp == 'h' ) return usage_legic_info();
+	
+	UsbCommand c = {CMD_LEGIC_INFO, {0,0,0}};
+	clearCommandBuffer();
+    SendCommand(&c);
+	UsbCommand resp;
+	if (WaitForResponseTimeout(CMD_ACK, &resp, 1000)) {
+		uint8_t isOK = resp.arg[0] & 0xFF;
+		uint16_t tagtype = resp.arg[1] & 0xFFF;
+		 if ( isOK ) {
+			PrintAndLog(" UID : %s", sprint_hex(resp.d.asBytes, 4));
+			switch(tagtype) {
+				case 22: PrintAndLog("MIM22 card (22bytes)"); break;
+				case 256: PrintAndLog("MIM256 card (256bytes)"); break;
+				case 1024: PrintAndLog("MIM1024 card (1024bytes)");	break;				
+				default: {
+					PrintAndLog("Unknown card format: %x", tagtype); 
+					return 1;
+				}
+			}		
+		} else {
+			PrintAndLog("legic card select failed");
+			return 1;
+		}
+	} else {
+		PrintAndLog("command execution time out");
+		return 1;
+	}
+	return 0;
+}
+int CmdLegicInfo(const char *Cmd){
+	return HFLegicInfo(Cmd, TRUE);
+}
+	
+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] <iv> -- 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> <iv> -- Write sample buffer (user after load or read)"},
+	{"writeraw",CmdLegicRfRawWrite,	0, "<address> <value> <iv> -- 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"},
+	{"info",	CmdLegicInfo, 1, "Information"},
+	{NULL, NULL, 0, NULL}
+};
+
+int CmdHFLegic(const char *Cmd) {
+	clearCommandBuffer();
+	CmdsParse(CommandTable, Cmd);
+	return 0;
+}
+
+int CmdHelp(const char *Cmd) {
+	CmdsHelp(CommandTable);
+	return 0;
+}
\ No newline at end of file