X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/28fdb04fd8d62e46c36f959b373d662f1a146448..8040711b9026716982b6909cc2c9abdbb930a583:/client/cmdhflegic.c diff --git a/client/cmdhflegic.c b/client/cmdhflegic.c index 26a2c724..0262f81c 100644 --- a/client/cmdhflegic.c +++ b/client/cmdhflegic.c @@ -10,357 +10,477 @@ #include #include -//#include "proxusb.h" #include "proxmark3.h" #include "data.h" #include "ui.h" #include "cmdparser.h" #include "cmdhflegic.h" #include "cmdmain.h" - +#include "util.h" +#include "crc.h" static int CmdHelp(const char *Cmd); -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, " [] -- Store samples"}, - {"load", CmdLegicLoad, 0, " -- Restore samples"}, - {"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"}, - {"write", CmdLegicRfWrite,0, " -- Write sample buffer (user after load or read)"}, - {"fill", CmdLegicRfFill, 0, " -- Fill/Write tag with constant value"}, - {NULL, NULL, 0, NULL} -}; +int usage_legic_calccrc8(void){ + PrintAndLog("Calculates the legic crc8 on the input hexbytes."); + PrintAndLog("There must be an even number of hexsymbols as input."); + PrintAndLog("Usage: hf legic crc8 "); + PrintAndLog("Options :"); + PrintAndLog(" : hex bytes in a string"); + PrintAndLog(""); + PrintAndLog("Sample : hf legic crc8 deadbeef1122"); + return 0; +} -int CmdHFLegic(const char *Cmd) -{ - CmdsParse(CommandTable, Cmd); - return 0; +int usage_legic_load(void){ + PrintAndLog("It loads datasamples from the file `filename` to device memory"); + PrintAndLog("Usage: hf legic load "); + PrintAndLog(" sample: hf legic load filename"); + return 0; } -int CmdHelp(const char *Cmd) -{ - CmdsHelp(CommandTable); - return 0; +int usage_legic_read(void){ + PrintAndLog("Read data from a legic tag."); + PrintAndLog("Usage: hf legic read "); + PrintAndLog("Options :"); + PrintAndLog(" : offset in data array to start download from"); + PrintAndLog(" : 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 + * This is based on information given in the talk held * by Henryk Ploetz and Karsten Nohl at 26c3 */ -int CmdLegicDecode(const char *Cmd) -{ - int h, i, j, k, n; - int segment_len = 0; - int segment_flag = 0; - int stamp_len = 0; - int crc = 0; - int wrp = 0; - int wrc = 0; - int data_buf[1032]; // receiver buffer - char out_string[3076]; // just use big buffer - bad practice - char token_type[4]; - int delivered = 0; - - h = 0; - - // copy data from proxmark into buffer - for (i = 0; i < 256; i += 12, h += 48) { - UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}}; - SendCommand(&c); - WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K, NULL); - - for (j = 0; j < 48; j += 8) { - for (k = 0; k < 8; k++) { - data_buf[h+j+k] = sample_buf[j+k]; - } - delivered += 8; - if (delivered >= 1024) - break; - } - } - - // Output CDF System area (9 bytes) plus remaining header area (12 bytes) - - PrintAndLog("\nCDF: System Area"); - - PrintAndLog("MCD: %02x, MSN: %02x %02x %02x, MCC: %02x", - data_buf[0], - data_buf[1], - data_buf[2], - data_buf[3], - data_buf[4] - ); - - crc = data_buf[4]; +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[1024]; // receiver buffer, should be 1024.. + char token_type[4]; + + // 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" + ); - switch (data_buf[5]&0x7f) { - case 0x00 ... 0x2f: - strncpy(token_type, "IAM",sizeof(token_type)); - break; - case 0x30 ... 0x6f: - strcpy(token_type, "SAM"); - break; - case 0x70 ... 0x7f: - strcpy(token_type, "GAM"); - break; - default: - strcpy(token_type, "???"); - break; - } - - stamp_len = 0xfc - data_buf[6]; - - PrintAndLog("DCF: %02x %02x, Token_Type=%s (OLE=%01u), Stamp_len=%02u", - data_buf[5], - data_buf[6], - token_type, - (data_buf[5]&0x80)>>7, - stamp_len - ); - - PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x", - data_buf[7]&0x0f, - (data_buf[7]&0x70)>>4, - (data_buf[7]&0x80)>>7, - data_buf[7], - data_buf[8] - ); - - PrintAndLog("Remaining Header Area"); - - PrintAndLog("%02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x", - data_buf[9], - data_buf[10], - data_buf[11], - data_buf[12], - data_buf[13], - data_buf[14], - data_buf[15], - data_buf[16], - data_buf[17], - data_buf[18], - data_buf[19], - data_buf[20], - data_buf[21] - ); - - PrintAndLog("\nADF: User Area"); - - i = 22; - for (n=0; n<64; n++) { - segment_len = ((data_buf[i+1]^crc)&0x0f) * 256 + (data_buf[i]^crc); - segment_flag = ((data_buf[i+1]^crc)&0xf0)>>4; - - wrp = (data_buf[i+2]^crc); - wrc = ((data_buf[i+3]^crc)&0x70)>>4; - - PrintAndLog("Segment %02u: raw header=%02x %02x %02x %02x, flag=%01x (valid=%01u, last=%01u), len=%04u, WRP=%02u, WRC=%02u, RD=%01u, CRC=%02x", - n, - data_buf[i]^crc, - data_buf[i+1]^crc, - data_buf[i+2]^crc, - data_buf[i+3]^crc, - segment_flag, - (segment_flag&0x4)>>2, - (segment_flag&0x8)>>3, - segment_len, - wrp, - wrc, - ((data_buf[i+3]^crc)&0x80)>>7, - (data_buf[i+4]^crc) - ); - - i+=5; - - if (wrc>0) { - PrintAndLog("WRC protected area:"); - for (k=0, j=0; k < wrc && j<(sizeof(out_string)-3); k++, i++, j += 3) { - sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); - out_string[j+2] = ' '; - }; - - out_string[j] = '\0'; - - PrintAndLog("%s", out_string); - } - - if (wrp>wrc) { - PrintAndLog("Remaining write protected area:"); - - for (k=0, j=0; k < (wrp-wrc) && j<(sizeof(out_string)-3); k++, i++, j += 3) { - sprintf(&out_string[j], "%02x", (data_buf[i]^crc)); - out_string[j+2] = ' '; - }; - - out_string[j] = '\0'; - - PrintAndLog("%s", out_string); - if((wrp-wrc) == 8) { - sprintf(out_string,"Card ID: %2X%02X%02X",data_buf[i-4]^crc,data_buf[i-3]^crc,data_buf[i-2]^crc); - PrintAndLog("%s", out_string); - } - } + switch (data_buf[5] & 0x7f) { + case 0x00 ... 0x2f: + strncpy(token_type, "IAM",sizeof(token_type)); + break; + case 0x30 ... 0x6f: + strncpy(token_type, "SAM",sizeof(token_type)); + break; + case 0x70 ... 0x7f: + strncpy(token_type, "GAM",sizeof(token_type)); + break; + default: + strncpy(token_type, "???",sizeof(token_type)); + break; + } + + stamp_len = 0xfc - data_buf[6]; + + PrintAndLog("DCF: %02x %02x, Token Type=%s (OLE=%01u), Stamp len=%02u", + data_buf[5], + data_buf[6], + token_type, + (data_buf[5]&0x80)>>7, + stamp_len + ); + + PrintAndLog("WRP=%02u, WRC=%01u, RD=%01u, raw=%02x, SSC=%02x", + data_buf[7]&0x0f, + (data_buf[7]&0x70)>>4, + (data_buf[7]&0x80)>>7, + data_buf[7], + data_buf[8] + ); + + PrintAndLog("Remaining Header Area"); + PrintAndLog("%s", sprint_hex(data_buf+9, 13)); + + uint8_t segCrcBytes[8] = {0x00}; + uint32_t segCalcCRC = 0; + uint32_t segCRC = 0; + + // see if user area is xored or just zeros. + int numOfZeros = 0; + for (int index=22; index < 256; ++index){ + if ( data_buf[index] == 0x00 ) + ++numOfZeros; + } + // if possible zeros is less then 60%, lets assume data is xored + // 256 - 22 (header) = 234 + // 1024 - 22 (header) = 1002 + int isXored = (numOfZeros*100/stamp_len) < 50; + PrintAndLog("is data xored? %d ( %d %)", isXored, (numOfZeros*100/stamp_len)); + + print_hex_break( data_buf, 33, 16); + + return 0; + + PrintAndLog("\nADF: User Area"); + PrintAndLog("------------------------------------------------------"); + i = 22; + // 64 potential segements + // how to detect there is no segments?!? + for ( segmentNum=0; segmentNum<64; 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; - 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] = ' '; - }; + if ( hasWRC ) { + PrintAndLog("WRC protected area: (I %d | K %d| WRC %d)", i, k, wrc); + PrintAndLog("\nrow | data"); + PrintAndLog("-----+------------------------------------------------"); + // de-xor? if not zero, assume it needs xoring. + if ( isXored) { + for ( k=i; k < wrc; ++k) + data_buf[k] ^= crc; + } + print_hex_break( data_buf+i, wrc, 16); + + i += wrc; + } - 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("-----+------------------------------------------------"); + + if (isXored) { + for (k=i; k < wrp_len; ++k) + data_buf[k] ^= crc; + } + + print_hex_break( data_buf+i, wrp_len, 16); + + i += wrp_len; + + // does this one work? + 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("%s", out_string); + PrintAndLog("Remaining segment payload: (I %d | K %d | Remain LEN %d)", i, k, remain_seg_payload_len); + PrintAndLog("\nrow | data"); + PrintAndLog("-----+------------------------------------------------"); + if ( isXored ) { + for ( k=i; k < remain_seg_payload_len; ++k) + data_buf[k] ^= crc; + } + + print_hex_break( data_buf+i, remain_seg_payload_len, 16); - // end with last segment - if (segment_flag & 0x8) - return 0; - }; - return 0; + i += remain_seg_payload_len; + + PrintAndLog("-----+------------------------------------------------\n"); + + // end with last segment + if (segment_flag & 0x8) return 0; + + } // end for loop + return 0; } -int CmdLegicRFRead(const char *Cmd) -{ - int byte_count=0,offset=0; - sscanf(Cmd, "%i %i", &offset, &byte_count); - if(byte_count == 0) byte_count = -1; - if(byte_count + offset > 1024) byte_count = 1024 - offset; - UsbCommand c={CMD_READER_LEGIC_RF, {offset, byte_count, 0}}; - SendCommand(&c); - 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) -{ - FILE *f = fopen(Cmd, "r"); +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; 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 n; - int requested = 1024; - int offset = 0; - char filename[1024]; - sscanf(Cmd, " %s %i %i", filename, &requested, &offset); - if (offset % 4 != 0) { - PrintAndLog("Offset must be a multiple of 4"); - return 0; - } - offset = offset/4; - - int delivered = 0; - - if (requested == 0) { - n = 12; - requested = 12; - } else { - n = requested/4; - } - - FILE *f = fopen(filename, "w"); - if(!f) { - PrintAndLog("couldn't open '%s'", Cmd+1); - return -1; - } - - for (int i = offset; i < n+offset; i += 12) { - UsbCommand c = {CMD_DOWNLOAD_RAW_ADC_SAMPLES_125K, {i, 0, 0}}; - SendCommand(&c); - WaitForResponse(CMD_DOWNLOADED_RAW_ADC_SAMPLES_125K, NULL); - for (int j = 0; j < 48; j += 8) { - fprintf(f, "%02x %02x %02x %02x %02x %02x %02x %02x\n", - sample_buf[j+0], - sample_buf[j+1], - sample_buf[j+2], - sample_buf[j+3], - sample_buf[j+4], - sample_buf[j+5], - sample_buf[j+6], - sample_buf[j+7] - ); - delivered += 8; - if (delivered >= requested) - break; - } - if (delivered >= requested) - break; - } +int CmdLegicSave(const char *Cmd) { + int requested = 1024; + int offset = 0; + int delivered = 0; + char filename[FILE_PATH_SIZE]; + uint8_t got[1024] = {0x00}; - fclose(f); - PrintAndLog("saved %u samples", delivered); - return 0; + 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, + > 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]); +//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; } -int CmdLegicRfFill(const char *Cmd) -{ - UsbCommand cmd ={CMD_WRITER_LEGIC_RF}; - int res = sscanf(Cmd, " 0x%llx 0x%llx 0x%llx", &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]); +int CmdLegicRfFill(const char *Cmd) { + UsbCommand cmd = {CMD_WRITER_LEGIC_RF}; + int res = sscanf(Cmd, " 0x%"llx" 0x%"llx" 0x%"llx, &cmd.arg[0], &cmd.arg[1], &cmd.arg[2]); if(res != 3) { PrintAndLog("Please specify the offset, length and value as two hex strings"); return -1; } int i; - UsbCommand c={CMD_DOWNLOADED_SIM_SAMPLES_125K, {0, 0, 0}}; + 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); + c.d.asBytes[i] = cmd.arg[2]; } + + for(i = 0; i < 22; i++) { + c.arg[0] = i*48; + SendCommand(&c); + WaitForResponse(CMD_ACK,NULL); + } + clearCommandBuffer(); SendCommand(&cmd); return 0; } +int CmdLegicCalcCrc8(const char *Cmd){ + + int len = strlen(Cmd); + if ( len & 1 ) return usage_legic_calccrc8(); + + // add 1 for null terminator. + uint8_t *data = malloc(len+1); + if ( data == NULL ) return 1; + + if (param_gethex(Cmd, 0, data, len )) { + free(data); + return usage_legic_calccrc8(); + } + + uint32_t checksum = CRC8Legic(data, len/2); + PrintAndLog("Bytes: %s || CRC8: %X", sprint_hex(data, len/2), checksum ); + free(data); + return 0; +} + +static command_t CommandTable[] = { + {"help", CmdHelp, 1, "This help"}, + {"decode", CmdLegicDecode, 0, "Display deobfuscated and decoded LEGIC RF tag data (use after hf legic reader)"}, + {"read", CmdLegicRFRead, 0, "[offset][length] -- read bytes from a LEGIC card"}, + {"save", CmdLegicSave, 0, " [] -- Store samples"}, + {"load", CmdLegicLoad, 0, " -- Restore samples"}, + {"sim", CmdLegicRfSim, 0, "[phase drift [frame drift [req/resp drift]]] Start tag simulator (use after load or read)"}, + {"write", CmdLegicRfWrite,0, " -- Write sample buffer (user after load or read)"}, + {"fill", CmdLegicRfFill, 0, " -- 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; +} \ No newline at end of file