- uint32_t i;
- int invert=0; //invert default
- int high = 0, low = 0;
- int clk=DetectClock(0); //clock default
- uint8_t BitStream[MAX_GRAPH_TRACE_LEN] = {0};
-
- sscanf(Cmd, "%i %i", &clk, &invert);
- if (clk<8) clk =64;
- if (clk<32) clk=32;
- if (invert != 0 && invert != 1) {
- PrintAndLog("Invalid argument: %s", Cmd);
- return 0;
- }
- uint32_t initLoopMax = 1000;
- if (initLoopMax>GraphTraceLen) initLoopMax=GraphTraceLen;
- // Detect high and lows
- PrintAndLog("Using Clock: %d and invert=%d",clk,invert);
- for (i = 0; i < initLoopMax; ++i) //1000 samples should be plenty to find high and low values
- {
- if (GraphBuffer[i] > high)
- high = GraphBuffer[i];
- else if (GraphBuffer[i] < low)
- low = GraphBuffer[i];
- }
- if ((high < 30) && ((high !=1)||(low !=-1))){ //throw away static - allow 1 and -1 (in case of threshold command first)
- PrintAndLog("no data found");
- return 0;
- }
- //13% fuzz in case highs and lows aren't clipped [marshmellow]
- high=(int)(0.75*high);
- low=(int)(0.75*low);
-
- //PrintAndLog("DEBUG - valid high: %d - valid low: %d",high,low);
- int lastBit = 0; //set first clock check
- uint32_t bitnum = 0; //output counter
- uint8_t tol = 0; //clock tolerance adjust - waves will be accepted as within the clock if they fall + or - this value + clock from last valid wave
- if (clk==32)tol=1; //clock tolerance may not be needed anymore currently set to + or - 1 but could be increased for poor waves or removed entirely
- uint32_t iii = 0;
- uint32_t gLen = GraphTraceLen;
- if (gLen > 500) gLen=500;
- uint8_t errCnt =0;
- uint32_t bestStart = GraphTraceLen;
- uint32_t bestErrCnt = (GraphTraceLen/1000);
- //PrintAndLog("DEBUG - lastbit - %d",lastBit);
- //loop to find first wave that works
- for (iii=0; iii < gLen; ++iii){
- if ((GraphBuffer[iii]>=high)||(GraphBuffer[iii]<=low)){
- lastBit=iii-clk;
- //loop through to see if this start location works
- for (i = iii; i < GraphTraceLen; ++i) {
- if ((GraphBuffer[i] >= high) && ((i-lastBit)>(clk-tol))){
- lastBit+=clk;
- BitStream[bitnum] = invert;
- bitnum++;
- } else if ((GraphBuffer[i] <= low) && ((i-lastBit)>(clk-tol))){
- //low found and we are expecting a bar
- lastBit+=clk;
- BitStream[bitnum] = 1-invert;
- bitnum++;
- } else {
- //mid value found or no bar supposed to be here
- if ((i-lastBit)>(clk+tol)){
- //should have hit a high or low based on clock!!
-
-
- //debug
- //PrintAndLog("DEBUG - no wave in expected area - location: %d, expected: %d-%d, lastBit: %d - resetting search",i,(lastBit+(clk-((int)(tol)))),(lastBit+(clk+((int)(tol)))),lastBit);
- if (bitnum > 0){
- BitStream[bitnum]=77;
- bitnum++;
- }
-
-
- errCnt++;
- lastBit+=clk;//skip over until hit too many errors
- if (errCnt>((GraphTraceLen/1000))){ //allow 1 error for every 1000 samples else start over
- errCnt=0;
- bitnum=0;//start over
- break;
- }
- }
- }
- }
- //we got more than 64 good bits and not all errors
- if ((bitnum > (64+errCnt)) && (errCnt<(GraphTraceLen/1000))) {
- //possible good read
- if (errCnt==0) break; //great read - finish
- if (bestStart == iii) break; //if current run == bestErrCnt run (after exhausted testing) then finish
- if (errCnt<bestErrCnt){ //set this as new best run
- bestErrCnt=errCnt;
- bestStart = iii;
- }
- }
- }
- if (iii>=gLen){ //exhausted test
- //if there was a ok test go back to that one and re-run the best run (then dump after that run)
- if (bestErrCnt < (GraphTraceLen/1000)) iii=bestStart;
- }
- }
- if (bitnum>16){
-
- PrintAndLog("Data start pos:%d, lastBit:%d, stop pos:%d, numBits:%d",iii,lastBit,i,bitnum);
- //move BitStream back to GraphBuffer
- ClearGraph(0);
- for (i=0; i < bitnum; ++i){
- GraphBuffer[i]=BitStream[i];
- }
- GraphTraceLen=bitnum;
- RepaintGraphWindow();
- //output
- if (errCnt>0){
- PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt);
- }
- PrintAndLog("ASK decoded bitstream:");
- // Now output the bitstream to the scrollback by line of 16 bits
- printBitStream2(BitStream,bitnum);
- Em410xDecode(Cmd);
- }
- return 0;
+ char cmdp = param_getchar(Cmd, 0);
+ if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') {
+ PrintAndLog("Usage: data rawdemod am [clock] <invert> [maxError] [maxLen] [amplify]");
+ PrintAndLog(" [set clock as integer] optional, if not set, autodetect");
+ PrintAndLog(" <invert>, 1 to invert output");
+ PrintAndLog(" [set maximum allowed errors], default = 100");
+ PrintAndLog(" [set maximum Samples to read], default = 32768 (512 bits at rf/64)");
+ PrintAndLog(" <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
+ PrintAndLog("");
+ PrintAndLog(" sample: data rawdemod am = demod an ask/manchester tag from GraphBuffer");
+ PrintAndLog(" : data rawdemod am 32 = demod an ask/manchester tag from GraphBuffer using a clock of RF/32");
+ PrintAndLog(" : data rawdemod am 32 1 = demod an ask/manchester tag from GraphBuffer using a clock of RF/32 and inverting data");
+ PrintAndLog(" : data rawdemod am 1 = demod an ask/manchester tag from GraphBuffer while inverting data");
+ PrintAndLog(" : data rawdemod am 64 1 0 = demod an ask/manchester tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
+ return 0;
+ }
+ return ASKDemod(Cmd, TRUE, TRUE, 1);
+}
+
+//by marshmellow
+//manchester decode
+//stricktly take 10 and 01 and convert to 0 and 1
+int Cmdmandecoderaw(const char *Cmd)
+{
+ int i =0;
+ int errCnt=0;
+ size_t size=0;
+ int invert=0;
+ size_t maxErr = 20;
+ char cmdp = param_getchar(Cmd, 0);
+ if (strlen(Cmd) > 5 || cmdp == 'h' || cmdp == 'H') {
+ PrintAndLog("Usage: data manrawdecode [invert] [maxErr]");
+ PrintAndLog(" Takes 10 and 01 and converts to 0 and 1 respectively");
+ PrintAndLog(" --must have binary sequence in demodbuffer (run data askrawdemod first)");
+ PrintAndLog(" [invert] invert output");
+ PrintAndLog(" [maxErr] set number of errors allowed (default = 20)");
+ PrintAndLog("");
+ PrintAndLog(" sample: data manrawdecode = decode manchester bitstream from the demodbuffer");
+ return 0;
+ }
+ if (DemodBufferLen==0) return 0;
+ uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
+ int high=0,low=0;
+ for (;i<DemodBufferLen;++i){
+ if (DemodBuffer[i]>high) high=DemodBuffer[i];
+ else if(DemodBuffer[i]<low) low=DemodBuffer[i];
+ BitStream[i]=DemodBuffer[i];
+ }
+ if (high>7 || low <0 ){
+ PrintAndLog("Error: please raw demod the wave first then manchester raw decode");
+ return 0;
+ }
+
+ sscanf(Cmd, "%i %i", &invert, &maxErr);
+ size=i;
+ errCnt=manrawdecode(BitStream, &size, invert);
+ if (errCnt>=maxErr){
+ PrintAndLog("Too many errors: %d",errCnt);
+ return 0;
+ }
+ PrintAndLog("Manchester Decoded - # errors:%d - data:",errCnt);
+ PrintAndLog("%s", sprint_bin_break(BitStream, size, 16));
+ if (errCnt==0){
+ uint64_t id = 0;
+ uint32_t hi = 0;
+ size_t idx=0;
+ if (Em410xDecode(BitStream, &size, &idx, &hi, &id)){
+ //need to adjust to set bitstream back to manchester encoded data
+ //setDemodBuf(BitStream, size, idx);
+
+ printEM410x(hi, id);
+ }
+ }
+ return 1;
+}
+
+//by marshmellow
+//biphase decode
+//take 01 or 10 = 0 and 11 or 00 = 1
+//takes 2 arguments "offset" default = 0 if 1 it will shift the decode by one bit
+// and "invert" default = 0 if 1 it will invert output
+// the argument offset allows us to manually shift if the output is incorrect - [EDIT: now auto detects]
+int CmdBiphaseDecodeRaw(const char *Cmd)
+{
+ size_t size=0;
+ int offset=0, invert=0, maxErr=20, errCnt=0;
+ char cmdp = param_getchar(Cmd, 0);
+ if (strlen(Cmd) > 3 || cmdp == 'h' || cmdp == 'H') {
+ PrintAndLog("Usage: data biphaserawdecode [offset] [invert] [maxErr]");
+ PrintAndLog(" Converts 10 or 01 to 1 and 11 or 00 to 0");
+ PrintAndLog(" --must have binary sequence in demodbuffer (run data askrawdemod first)");
+ PrintAndLog(" --invert for Conditional Dephase Encoding (CDP) AKA Differential Manchester");
+ PrintAndLog("");
+ PrintAndLog(" [offset <0|1>], set to 0 not to adjust start position or to 1 to adjust decode start position");
+ PrintAndLog(" [invert <0|1>], set to 1 to invert output");
+ PrintAndLog(" [maxErr int], set max errors tolerated - default=20");
+ PrintAndLog("");
+ PrintAndLog(" sample: data biphaserawdecode = decode biphase bitstream from the demodbuffer");
+ PrintAndLog(" sample: data biphaserawdecode 1 1 = decode biphase bitstream from the demodbuffer, set offset, and invert output");
+ return 0;
+ }
+ sscanf(Cmd, "%i %i %i", &offset, &invert, &maxErr);
+ if (DemodBufferLen==0){
+ PrintAndLog("DemodBuffer Empty - run 'data rawdemod ar' first");
+ return 0;
+ }
+ uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
+ memcpy(BitStream, DemodBuffer, DemodBufferLen);
+ size = DemodBufferLen;
+ errCnt=BiphaseRawDecode(BitStream, &size, offset, invert);
+ if (errCnt<0){
+ PrintAndLog("Error during decode:%d", errCnt);
+ return 0;
+ }
+ if (errCnt>maxErr){
+ PrintAndLog("Too many errors attempting to decode: %d",errCnt);
+ return 0;
+ }
+
+ if (errCnt>0){
+ PrintAndLog("# Errors found during Demod (shown as 7 in bit stream): %d",errCnt);
+ }
+ PrintAndLog("Biphase Decoded using offset: %d - # invert:%d - data:",offset,invert);
+ PrintAndLog("%s", sprint_bin_break(BitStream, size, 16));
+
+ if (offset) setDemodBuf(DemodBuffer,DemodBufferLen-offset, offset); //remove first bit from raw demod
+ return 1;
+}
+
+//by marshmellow
+// - ASK Demod then Biphase decode GraphBuffer samples
+int ASKbiphaseDemod(const char *Cmd, bool verbose)
+{
+ //ask raw demod GraphBuffer first
+ int offset=0, clk=0, invert=0, maxErr=0, ans=0;
+ ans = sscanf(Cmd, "%i %i %i %i", &offset, &clk, &invert, &maxErr);
+ if (ans>0)
+ ans = ASKDemod(Cmd+1, FALSE, FALSE, 0);
+ else
+ ans = ASKDemod(Cmd, FALSE, FALSE, 0);
+ if (!ans) {
+ if (g_debugMode || verbose) PrintAndLog("Error AskDemod: %d", ans);
+ return 0;
+ }
+
+ //attempt to Biphase decode DemodBuffer
+ size_t size = DemodBufferLen;
+ uint8_t BitStream[MAX_DEMOD_BUF_LEN];
+ memcpy(BitStream, DemodBuffer, DemodBufferLen);
+ int errCnt = BiphaseRawDecode(BitStream, &size, offset, 0);
+ if (errCnt < 0){
+ if (g_debugMode || verbose) PrintAndLog("Error BiphaseRawDecode: %d", errCnt);
+ return 0;
+ }
+ if (errCnt > maxErr) {
+ if (g_debugMode || verbose) PrintAndLog("Error BiphaseRawDecode too many errors: %d", errCnt);
+ return 0;
+ }
+ //success set DemodBuffer and return
+ setDemodBuf(BitStream, size, 0);
+ if (g_debugMode || verbose){
+ PrintAndLog("Biphase Decoded using offset: %d - # errors:%d - data:",offset,errCnt);
+ printDemodBuff();
+ }
+ return 1;
+}
+//by marshmellow - see ASKbiphaseDemod
+int Cmdaskbiphdemod(const char *Cmd)
+{
+ char cmdp = param_getchar(Cmd, 0);
+ if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') {
+ PrintAndLog("Usage: data rawdemod ab [offset] [clock] <invert> [maxError] [maxLen] <amplify>");
+ PrintAndLog(" [offset], offset to begin biphase, default=0");
+ PrintAndLog(" [set clock as integer] optional, if not set, autodetect");
+ PrintAndLog(" <invert>, 1 to invert output");
+ PrintAndLog(" [set maximum allowed errors], default = 100");
+ PrintAndLog(" [set maximum Samples to read], default = 32768 (512 bits at rf/64)");
+ PrintAndLog(" <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
+ PrintAndLog(" NOTE: <invert> can be entered as second or third argument");
+ PrintAndLog(" NOTE: <amplify> can be entered as first, second or last argument");
+ PrintAndLog(" NOTE: any other arg must have previous args set to work");
+ PrintAndLog("");
+ PrintAndLog(" NOTE: --invert for Conditional Dephase Encoding (CDP) AKA Differential Manchester");
+ PrintAndLog("");
+ PrintAndLog(" sample: data rawdemod ab = demod an ask/biph tag from GraphBuffer");
+ PrintAndLog(" : data rawdemod ab 0 a = demod an ask/biph tag from GraphBuffer, amplified");
+ PrintAndLog(" : data rawdemod ab 1 32 = demod an ask/biph tag from GraphBuffer using an offset of 1 and a clock of RF/32");
+ PrintAndLog(" : data rawdemod ab 0 32 1 = demod an ask/biph tag from GraphBuffer using a clock of RF/32 and inverting data");
+ PrintAndLog(" : data rawdemod ab 0 1 = demod an ask/biph tag from GraphBuffer while inverting data");
+ PrintAndLog(" : data rawdemod ab 0 64 1 0 = demod an ask/biph tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
+ PrintAndLog(" : data rawdemod ab 0 64 1 0 0 a = demod an ask/biph tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors, and amp");
+ return 0;
+ }
+ return ASKbiphaseDemod(Cmd, TRUE);
+}
+
+//by marshmellow
+//attempts to demodulate and identify a G_Prox_II verex/chubb card
+//WARNING: if it fails during some points it will destroy the DemodBuffer data
+// but will leave the GraphBuffer intact.
+//if successful it will push askraw data back to demod buffer ready for emulation
+int CmdG_Prox_II_Demod(const char *Cmd)
+{
+ if (!ASKbiphaseDemod(Cmd, FALSE)){
+ if (g_debugMode) PrintAndLog("ASKbiphaseDemod failed 1st try");
+ return 0;
+ }
+ size_t size = DemodBufferLen;
+ //call lfdemod.c demod for gProxII
+ int ans = gProxII_Demod(DemodBuffer, &size);
+ if (ans < 0){
+ if (g_debugMode) PrintAndLog("Error gProxII_Demod");
+ return 0;
+ }
+ //got a good demod
+ uint32_t ByteStream[65] = {0x00};
+ uint8_t xorKey=0;
+ uint8_t keyCnt=0;
+ uint8_t bitCnt=0;
+ uint8_t ByteCnt=0;
+ size_t startIdx = ans + 6; //start after preamble
+ for (size_t idx = 0; idx<size-6; idx++){
+ if ((idx+1) % 5 == 0){
+ //spacer bit - should be 0
+ if (DemodBuffer[startIdx+idx] != 0) {
+ if (g_debugMode) PrintAndLog("Error spacer not 0: %d, pos: %d",DemodBuffer[startIdx+idx],startIdx+idx);
+ return 0;
+ }
+ continue;
+ }
+ if (keyCnt<8){ //lsb first
+ xorKey = xorKey | (DemodBuffer[startIdx+idx]<<keyCnt);
+ keyCnt++;
+ if (keyCnt==8 && g_debugMode) PrintAndLog("xorKey Found: %02x", xorKey);
+ continue;
+ }
+ //lsb first
+ ByteStream[ByteCnt] = ByteStream[ByteCnt] | (DemodBuffer[startIdx+idx]<<bitCnt);
+ bitCnt++;
+ if (bitCnt % 8 == 0){
+ if (g_debugMode) PrintAndLog("byte %d: %02x",ByteCnt,ByteStream[ByteCnt]);
+ bitCnt=0;
+ ByteCnt++;
+ }
+ }
+ for (uint8_t i = 0; i < ByteCnt; i++){
+ ByteStream[i] ^= xorKey; //xor
+ if (g_debugMode) PrintAndLog("byte %d after xor: %02x", i, ByteStream[i]);
+ }
+ //now ByteStream contains 64 bytes of decrypted raw tag data
+ //
+ uint8_t fmtLen = ByteStream[0]>>2;
+ uint32_t FC = 0;
+ uint32_t Card = 0;
+ uint32_t raw1 = bytebits_to_byte(DemodBuffer+ans,32);
+ uint32_t raw2 = bytebits_to_byte(DemodBuffer+ans+32, 32);
+ uint32_t raw3 = bytebits_to_byte(DemodBuffer+ans+64, 32);
+
+ if (fmtLen==36){
+ FC = ((ByteStream[3] & 0x7F)<<7) | (ByteStream[4]>>1);
+ Card = ((ByteStream[4]&1)<<19) | (ByteStream[5]<<11) | (ByteStream[6]<<3) | (ByteStream[7]>>5);
+ PrintAndLog("G-Prox-II Found: FmtLen %d, FC %d, Card %d",fmtLen,FC,Card);
+ } else if(fmtLen==26){
+ FC = ((ByteStream[3] & 0x7F)<<1) | (ByteStream[4]>>7);
+ Card = ((ByteStream[4]&0x7F)<<9) | (ByteStream[5]<<1) | (ByteStream[6]>>7);
+ PrintAndLog("G-Prox-II Found: FmtLen %d, FC %d, Card %d",fmtLen,FC,Card);
+ } else {
+ PrintAndLog("Unknown G-Prox-II Fmt Found: FmtLen %d",fmtLen);
+ }
+ PrintAndLog("Raw: %08x%08x%08x", raw1,raw2,raw3);
+ setDemodBuf(DemodBuffer+ans, 96, 0);
+ return 1;
+}
+
+//by marshmellow - see ASKDemod
+int Cmdaskrawdemod(const char *Cmd)
+{
+ char cmdp = param_getchar(Cmd, 0);
+ if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') {
+ PrintAndLog("Usage: data rawdemod ar [clock] <invert> [maxError] [maxLen] [amplify]");
+ PrintAndLog(" [set clock as integer] optional, if not set, autodetect");
+ PrintAndLog(" <invert>, 1 to invert output");
+ PrintAndLog(" [set maximum allowed errors], default = 100");
+ PrintAndLog(" [set maximum Samples to read], default = 32768 (1024 bits at rf/64)");
+ PrintAndLog(" <amplify>, 'a' to attempt demod with ask amplification, default = no amp");
+ PrintAndLog("");
+ PrintAndLog(" sample: data rawdemod ar = demod an ask tag from GraphBuffer");
+ PrintAndLog(" : data rawdemod ar a = demod an ask tag from GraphBuffer, amplified");
+ PrintAndLog(" : data rawdemod ar 32 = demod an ask tag from GraphBuffer using a clock of RF/32");
+ PrintAndLog(" : data rawdemod ar 32 1 = demod an ask tag from GraphBuffer using a clock of RF/32 and inverting data");
+ PrintAndLog(" : data rawdemod ar 1 = demod an ask tag from GraphBuffer while inverting data");
+ PrintAndLog(" : data rawdemod ar 64 1 0 = demod an ask tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
+ PrintAndLog(" : data rawdemod ar 64 1 0 0 a = demod an ask tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors, and amp");
+ return 0;
+ }
+ return ASKDemod(Cmd, TRUE, FALSE, 0);
+}
+
+int AutoCorrelate(int window, bool SaveGrph, bool verbose)
+{
+ static int CorrelBuffer[MAX_GRAPH_TRACE_LEN];
+ size_t Correlation = 0;
+ int maxSum = 0;
+ int lastMax = 0;
+ if (verbose) PrintAndLog("performing %d correlations", GraphTraceLen - window);
+ for (int i = 0; i < GraphTraceLen - window; ++i) {
+ int sum = 0;
+ for (int j = 0; j < window; ++j) {
+ sum += (GraphBuffer[j]*GraphBuffer[i + j]) / 256;
+ }
+ CorrelBuffer[i] = sum;
+ if (sum >= maxSum-100 && sum <= maxSum+100){
+ //another max
+ Correlation = i-lastMax;
+ lastMax = i;
+ if (sum > maxSum) maxSum = sum;
+ } else if (sum > maxSum){
+ maxSum=sum;
+ lastMax = i;
+ }
+ }
+ if (Correlation==0){
+ //try again with wider margin
+ for (int i = 0; i < GraphTraceLen - window; i++){
+ if (CorrelBuffer[i] >= maxSum-(maxSum*0.05) && CorrelBuffer[i] <= maxSum+(maxSum*0.05)){
+ //another max
+ Correlation = i-lastMax;
+ lastMax = i;
+ //if (CorrelBuffer[i] > maxSum) maxSum = sum;
+ }
+ }
+ }
+ if (verbose && Correlation > 0) PrintAndLog("Possible Correlation: %d samples",Correlation);
+
+ if (SaveGrph){
+ GraphTraceLen = GraphTraceLen - window;
+ memcpy(GraphBuffer, CorrelBuffer, GraphTraceLen * sizeof (int));
+ RepaintGraphWindow();
+ }
+ return Correlation;
+}
+
+int usage_data_autocorr(void)
+{
+ //print help
+ PrintAndLog("Usage: data autocorr [window] [g]");
+ PrintAndLog("Options: ");
+ PrintAndLog(" h This help");
+ PrintAndLog(" [window] window length for correlation - default = 4000");
+ PrintAndLog(" g save back to GraphBuffer (overwrite)");
+ return 0;
projects / proxmark3-svn / blobdiff