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FIX: LEGIC - potential stack corruption calculating CRC from user input
[proxmark3-svn] / client / cmdhflegic.c
diff --git a/client/cmdhflegic.c b/client/cmdhflegic.c
index 0971e3066e3ed0882c0497d1cf148d21eb74af0e..9168258122140048a1ec15156a2d4d18f302b60b 100644 (file)
--- a/client/cmdhflegic.c
+++ b/client/cmdhflegic.c
@@ -7,164 +7,350 @@
 //-----------------------------------------------------------------------------
 // High frequency Legic commands
 //-----------------------------------------------------------------------------
 //-----------------------------------------------------------------------------
 // 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 "cmdhflegic.h"
-#include "cmdmain.h"
-#include "util.h"
+
 static int CmdHelp(const char *Cmd);
 
 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> c <crc type>");
+       PrintAndLog("Options:");
+       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 usage_legic_load(void){
+       PrintAndLog("It loads datasamples from the file `filename` to device memory");
+       PrintAndLog("Usage:  hf legic load <file name>");
+       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 <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("Samples:");
+       PrintAndLog("      hf legic read");
+       return 0;
+}
+
 /*
  *  Output BigBuf and deobfuscate LEGIC RF tag data.
 /*
  *  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
  */
  *  by Henryk Ploetz and Karsten Nohl at 26c3
  */
-int CmdLegicDecode(const char *Cmd)
-{
-       int i, j, k, n;
+int CmdLegicDecode(const char *Cmd) {
+       // Index for the bytearray.
+       int i = 0;
+       int k = 0, segmentNum;
        int segment_len = 0;
        int segment_flag = 0;
        int segment_len = 0;
        int segment_flag = 0;
-       int stamp_len = 0;
+       uint8_t stamp_len = 0;
        int crc = 0;
        int wrp = 0;
        int wrc = 0;
        int crc = 0;
        int wrp = 0;
        int wrc = 0;
-       uint8_t data_buf[3076]; // 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);
-
+       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)
        // 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("\nCDF: System Area");
-
-       PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x",
+       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[0],
                data_buf[1],
                data_buf[2],
                data_buf[3],
-               data_buf[4]
+               data_buf[4],
+               (calc_crc == crc) ? "OK":"Fail" 
        );
        );
-
-       crc = data_buf[4];
  
  
-       switch (data_buf[5]&0x7f) {
+
+       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));
                case 0x00 ... 0x2f:
                        strncpy(token_type, "IAM",sizeof(token_type));
+                                       fl = (0x2f - (data_buf[5] & 0x7f)) + 1;
                        break;
                case 0x30 ... 0x6f:
                        break;
                case 0x30 ... 0x6f:
-                       strcpy(token_type, "SAM");
+                       strncpy(token_type, "SAM",sizeof(token_type));
+                                       fl = (0x6f - (data_buf[5] & 0x7f)) + 1;
                        break;
                case 0x70 ... 0x7f:
                        break;
                case 0x70 ... 0x7f:
-                       strcpy(token_type, "GAM");
-                       break;
-               default:
-                       strcpy(token_type, "???");
+                       strncpy(token_type, "GAM",sizeof(token_type));
+                                       fl = (0x7f - (data_buf[5] & 0x7f)) + 1;
                        break;
        }
 
        stamp_len = 0xfc - data_buf[6];
                        break;
        }
 
        stamp_len = 0xfc - data_buf[6];
+               }
 
 
-       PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u",
+               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,
                data_buf[5],
                data_buf[6],
                token_type,
                (data_buf[5]&0x80)>>7,
-               stamp_len
+                       stamp_len,
+                       fl
        );
 
        );
 
-       PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x",
+       } 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[7]&0x0f,
                (data_buf[7]&0x70)>>4,
                (data_buf[7]&0x80)>>7,
-               data_buf[7],
                data_buf[8]
        );
                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));
        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("\nADF: User Area");
-  
+       PrintAndLog("------------------------------------------------------");
+
+               if(bIsSegmented) {
+
+                       // Data start point on segmented cards
        i = 22;  
        i = 22;  
-       for ( n=0; n<64; n++ ) {
+
+                       // 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;
                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;
 
                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,
+               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,
                        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,
-                       (segment_flag&0x4)>>2,
-                       (segment_flag&0x8)>>3,
-                       segment_len,
+                       (segment_flag & 0x4) >> 2,
+                       (segment_flag & 0x8) >> 3,
                        wrp,
                        wrc,
                        wrp,
                        wrc,
-                       ((data_buf[i+3]^crc)&0x80)>>7,
-                       (data_buf[i+4]^crc)
+                       ((data_buf[i+3]^crc) & 0x80) >> 7,
+                       segCRC,
+                       ( segCRC == segCalcCRC ) ? "OK" : "fail"
                );
 
                );
 
-               i+=5;
+               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] = ' ';
-                       }
+               if ( hasWRC ) {
+                       PrintAndLog("WRC protected area:   (I %d | K %d| WRC %d)", i, k, wrc);
+                       PrintAndLog("\nrow  | data");
+                       PrintAndLog("-----+------------------------------------------------");
 
 
-                       out_string[j] = '\0';
+                                       for ( k=i; k < (i+wrc); ++k)
+                                       data_buf[k] ^= crc;
 
 
-                       PrintAndLog("%s", out_string);
+                       print_hex_break( data_buf+i, wrc, 16);
+                       
+                       i += wrc;
                }
     
                }
     
-               if ( wrp>wrc ) {
-                       PrintAndLog("Remaining write protected area:");
-
-                       for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) {
-                               sprintf(&out_string[j], "%02x", (data_buf[i]^crc));
-                               out_string[j+2] = ' ';
-                       };
-
-                       out_string[j] = '\0';
+               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("-----+------------------------------------------------");
 
 
-                       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);
-                       }
+                                       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] = ' ';
-               };
-    
-               out_string[j] = '\0';
-    
-               PrintAndLog("%s", out_string);
+               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
                // 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) {
        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;
        int byte_count=0, offset=0;
        sscanf(Cmd, "%i %i", &offset, &byte_count);
        if(byte_count == 0) byte_count = -1;
@@ -177,18 +363,13 @@ int CmdLegicRFRead(const char *Cmd) {
 }
 
 int CmdLegicLoad(const char *Cmd) {
 }
 
 int CmdLegicLoad(const char *Cmd) {
-       char filename[FILE_PATH_SIZE] = {0x00};
-       int len = 0;
        
        char cmdp = param_getchar(Cmd, 0);
        
        char cmdp = param_getchar(Cmd, 0);
-       if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) {
-               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;
-       }
+       if ( cmdp == 'H' || cmdp == 'h' || cmdp == 0x00) return usage_legic_load();
 
 
-       len = strlen(Cmd);      
+       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;
        if (len > FILE_PATH_SIZE) {
                PrintAndLog("Filepath too long (was %s bytes), max allowed is %s ", len, FILE_PATH_SIZE);
                return 0;
@@ -202,29 +383,60 @@ int CmdLegicLoad(const char *Cmd) {
     }
        
     char line[80]; 
     }
        
     char line[80]; 
-       int offset = 0, j; 
-       uint32_t data[8] = {0x00};
-       
+       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", 
     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;
         }
                        
         if(res != 8) {
           PrintAndLog("Error: could not read samples");
           fclose(f);
           return -1;
         }
-               
-        UsbCommand c = { CMD_DOWNLOADED_SIM_SAMPLES_125K, {offset, 0, 0}};
-               memcpy(c.d.asBytes, data, 8);
-               clearCommandBuffer();
-        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);
     }
     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;
 }
 
     return 0;
 }
 
@@ -252,25 +464,22 @@ int CmdLegicSave(const char *Cmd) {
                return 0;
        }
 
                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;
        }
        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",
        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]
+                       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;
                );
                delivered += 8;
                if (delivered >= requested) break;
@@ -281,14 +490,16 @@ int CmdLegicSave(const char *Cmd) {
        return 0;
 }
 
        return 0;
 }
 
+//TODO: write a help text (iceman)
 int CmdLegicRfSim(const char *Cmd) {
 int CmdLegicRfSim(const char *Cmd) {
-       UsbCommand c= {CMD_SIMULATE_TAG_LEGIC_RF, {6,3,0}};
+       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;
 }
 
        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]);
 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]);
@@ -301,8 +512,36 @@ int CmdLegicRfWrite(const char *Cmd) {
     return 0;
 }
 
     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)");             
+               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) {
 int CmdLegicRfFill(const char *Cmd) {
-    UsbCommand cmd = {CMD_WRITER_LEGIC_RF};
+    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");
     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");
@@ -311,29 +550,111 @@ int CmdLegicRfFill(const char *Cmd) {
 
     int i;
     UsbCommand c = {CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}};
 
     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];
-    }
-       
+       memset(c.d.asBytes, cmd.arg[2], 48);
+
        for(i = 0; i < 22; i++) {
                c.arg[0] = i*48;
        for(i = 0; i < 22; i++) {
                c.arg[0] = i*48;
+               
+               clearCommandBuffer();
                SendCommand(&c);
                SendCommand(&c);
-               WaitForResponse(CMD_ACK,NULL);
+               WaitForResponse(CMD_ACK, NULL);
        }
        clearCommandBuffer();
     SendCommand(&cmd);
     return 0;
  }
 
        }
        clearCommandBuffer();
     SendCommand(&cmd);
     return 0;
  }
 
+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;
+                       param_getptr(Cmd, &bg, &en, cmdp+1);
+                       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;
+                       }
+                       
+                       param_gethex(Cmd, cmdp+1, data, len);
+
+                       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;
+               default:
+                       PrintAndLog("LEGIC CRC8: %X",  CRC8Legic(data, len) );
+                       break;
+       }
+       
+       if (data) free(data);
+       return 0;
+} 
+ 
 static command_t CommandTable[] =  {
 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"},
+       {"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}
 };
 
        {NULL, NULL, 0, NULL}
 };
 
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