//by marshmellow
void setDemodBuf(uint8_t *buff, size_t size, size_t startIdx)
{
+ if (buff == NULL)
+ return;
+
+ if ( size >= MAX_DEMOD_BUF_LEN)
+ size = MAX_DEMOD_BUF_LEN;
+
size_t i = 0;
for (; i < size; i++){
DemodBuffer[i]=buff[startIdx++];
return;
}
-
+int CmdPrintDemodBuff(const char *Cmd)
+{
+ char hex;
+ char printBuff[512]={0x00};
+ uint8_t numBits = DemodBufferLen & 0xFFF0;
+ sscanf(Cmd, "%c", &hex);
+ if (hex == 'h'){
+ PrintAndLog("Usage: data printdemodbuffer [x]");
+ PrintAndLog("Options: ");
+ PrintAndLog(" h This help");
+ PrintAndLog(" x output in hex (omit for binary output)");
+ return 0;
+ }
+ if (hex == 'x'){
+ numBits = binarraytohex(printBuff, (char *)DemodBuffer, numBits);
+ if (numBits==0) return 0;
+ PrintAndLog("DemodBuffer: %s",printBuff);
+ } else {
+ printDemodBuff();
+ }
+ return 1;
+}
int CmdAmp(const char *Cmd)
{
int i, rising, falling;
* Updates the Graph trace with 0/1 values
*
* Arguments:
- * c : 0 or 1
+ * c : 0 or 1 (or invert)
*/
- //this method is dependant on all highs and lows to be the same(or clipped) this creates issues[marshmellow] it also ignores the clock
+ //this method ignores the clock
+
+ //this function strictly converts highs and lows to 1s and 0s for each sample in the graphbuffer
int Cmdaskdemod(const char *Cmd)
{
int i;
int c, high = 0, low = 0;
- // TODO: complain if we do not give 2 arguments here !
- // (AL - this doesn't make sense! we're only using one argument!!!)
sscanf(Cmd, "%i", &c);
- /* Detect high and lows and clock */
- // (AL - clock???)
+ /* Detect high and lows */
for (i = 0; i < GraphTraceLen; ++i)
{
if (GraphBuffer[i] > high)
* down)
*/
//[marhsmellow] change == to >= for high and <= for low for fuzz
- if ((GraphBuffer[i] == high) && (GraphBuffer[i - 1] == c)) {
+ if ((GraphBuffer[i] >= high) && (GraphBuffer[i - 1] == c)) {
GraphBuffer[i] = 1 - c;
- } else if ((GraphBuffer[i] == low) && (GraphBuffer[i - 1] == (1 - c))){
+ } else if ((GraphBuffer[i] <= low) && (GraphBuffer[i - 1] == (1 - c))){
GraphBuffer[i] = c;
} else {
/* No transition */
return 0;
}
+//this function strictly converts >1 to 1 and <1 to 0 for each sample in the graphbuffer
+int CmdGetBitStream(const char *Cmd)
+{
+ int i;
+ CmdHpf(Cmd);
+ for (i = 0; i < GraphTraceLen; i++) {
+ if (GraphBuffer[i] >= 1) {
+ GraphBuffer[i] = 1;
+ } else {
+ GraphBuffer[i] = 0;
+ }
+ }
+ RepaintGraphWindow();
+ return 0;
+}
+
+
//by marshmellow
void printBitStream(uint8_t BitStream[], uint32_t bitLen)
{
PrintAndLog("Biphase Decoded using offset: %d - # errors:%d - data:",offset,errCnt);
printBitStream(BitStream, size);
PrintAndLog("\nif bitstream does not look right try offset=1");
+ if (offset == 1) setDemodBuf(DemodBuffer,DemodBufferLen-1,1); //remove first bit from raw demod
return 1;
}
+// set demod buffer back to raw after biphase demod
+void setBiphaseDemodBuf(uint8_t *BitStream, size_t size)
+{
+ uint8_t rawStream[512]={0x00};
+ size_t i=0;
+ uint8_t curPhase=0;
+ if (size > 256) {
+ PrintAndLog("ERROR - Biphase Demod Buffer overrun");
+ return;
+ }
+ for (size_t idx=0; idx<size; idx++){
+ if(!BitStream[idx]){
+ rawStream[i++] = curPhase;
+ rawStream[i++] = curPhase;
+ curPhase ^= 1;
+ } else {
+ rawStream[i++] = curPhase;
+ rawStream[i++] = curPhase ^ 1;
+ }
+ }
+ setDemodBuf(rawStream,i,0);
+ return;
+}
//by marshmellow
//takes 4 arguments - clock, invert, maxErr as integers and amplify as char
//attempts to demodulate ask only
return 1;
}
+//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)
+{
+ int ans = ASKrawDemod(Cmd, FALSE);
+ if (ans <= 0) {
+ if (g_debugMode) PrintAndLog("Error AskrawDemod: %d",ans);
+ return ans;
+ }
+ size_t size = DemodBufferLen;
+ ans = BiphaseRawDecode(DemodBuffer, &size, 0, 0);
+ if (ans !=0) {
+ if (g_debugMode) PrintAndLog("Error BiphaseRawDecode: %d",ans);
+ return ans;
+ }
+ //call lfdemod.c demod for gProxII
+ ans = gProxII_Demod(DemodBuffer, &size);
+ if (ans < 0){
+ if (g_debugMode) PrintAndLog("Error gProxII_Demod 1st Try: %d",ans);
+ //try biphase again
+ ans = BiphaseRawDecode(DemodBuffer, &size, 1, 0);
+ if (ans != 0) {
+ if (g_debugMode) PrintAndLog("Error BiphaseRawDecode: %d",ans);
+ return ans;
+ }
+ ans = gProxII_Demod(DemodBuffer, &size);
+ if (ans < 0) {
+ if (g_debugMode) PrintAndLog("Error gProxII_Demod 1st Try: %d",ans);
+ return ans;
+ }
+ }
+ //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 -1;
+ }
+ 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);
+ setBiphaseDemodBuf(DemodBuffer+ans, 96);
+ return 1;
+}
+
//by marshmellow - see ASKrawDemod
int Cmdaskrawdemod(const char *Cmd)
{
if(size > (8*32)+2) size = (8*32)+2; //only output a max of 8 blocks of 32 bits most tags will have full bit stream inside that sample size
if (verbose) {
PrintAndLog("FSK decoded bitstream:");
- printBitStream(BitStream,size);
+ printBitStream(BitStream,size);
}
return 1;
if (g_debugMode==1 && verbose) PrintAndLog("no data found, clk: %d, invert: %d, numbits: %d, errCnt: %d",clk,invert,BitLen,errCnt);
return 0;
}
- PrintAndLog("Tried NRZ Demod using Clock: %d - invert: %d - Bits Found: %d",clk,invert,BitLen);
+ if (verbose)
+ PrintAndLog("Tried NRZ Demod using Clock: %d - invert: %d - Bits Found: %d",clk,invert,BitLen);
//prime demod buffer for output
setDemodBuf(BitStream,BitLen,0);
PrintAndLog("# Errors during Demoding (shown as 77 in bit stream): %d",errCnt);
}
if (verbose) {
- PrintAndLog("NRZ demoded bitstream:");
- // Now output the bitstream to the scrollback by line of 16 bits
- printDemodBuff();
+ PrintAndLog("NRZ demoded bitstream:");
+ // Now output the bitstream to the scrollback by line of 16 bits
+ printDemodBuff();
}
return 1;
}
PrintAndLog(" <invert>, 1 for invert output");
PrintAndLog(" [set maximum allowed errors], default = 100.");
PrintAndLog("");
- PrintAndLog(" sample: data nrzrawdemod = demod a nrz/direct tag from GraphBuffer");
- PrintAndLog(" : data nrzrawdemod 32 = demod a nrz/direct tag from GraphBuffer using a clock of RF/32");
- PrintAndLog(" : data nrzrawdemod 32 1 = demod a nrz/direct tag from GraphBuffer using a clock of RF/32 and inverting data");
- PrintAndLog(" : data nrzrawdemod 1 = demod a nrz/direct tag from GraphBuffer while inverting data");
- PrintAndLog(" : data nrzrawdemod 64 1 0 = demod a nrz/direct tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
+ PrintAndLog(" sample: data rawdemod nr = demod a nrz/direct tag from GraphBuffer");
+ PrintAndLog(" : data rawdemod nr 32 = demod a nrz/direct tag from GraphBuffer using a clock of RF/32");
+ PrintAndLog(" : data rawdemod nr 32 1 = demod a nrz/direct tag from GraphBuffer using a clock of RF/32 and inverting data");
+ PrintAndLog(" : data rawdemod nr 1 = demod a nrz/direct tag from GraphBuffer while inverting data");
+ PrintAndLog(" : data rawdemod nr 64 1 0 = demod a nrz/direct tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
return 0;
}
return NRZrawDemod(Cmd, TRUE);
PrintAndLog(" <invert>, 1 for invert output");
PrintAndLog(" [set maximum allowed errors], default = 100.");
PrintAndLog("");
- PrintAndLog(" sample: data psk1rawdemod = demod a psk1 tag from GraphBuffer");
- PrintAndLog(" : data psk1rawdemod 32 = demod a psk1 tag from GraphBuffer using a clock of RF/32");
- PrintAndLog(" : data psk1rawdemod 32 1 = demod a psk1 tag from GraphBuffer using a clock of RF/32 and inverting data");
- PrintAndLog(" : data psk1rawdemod 1 = demod a psk1 tag from GraphBuffer while inverting data");
- PrintAndLog(" : data psk1rawdemod 64 1 0 = demod a psk1 tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
+ PrintAndLog(" sample: data rawdemod p1 = demod a psk1 tag from GraphBuffer");
+ PrintAndLog(" : data rawdemod p1 32 = demod a psk1 tag from GraphBuffer using a clock of RF/32");
+ PrintAndLog(" : data rawdemod p1 32 1 = demod a psk1 tag from GraphBuffer using a clock of RF/32 and inverting data");
+ PrintAndLog(" : data rawdemod p1 1 = demod a psk1 tag from GraphBuffer while inverting data");
+ PrintAndLog(" : data rawdemod p1 64 1 0 = demod a psk1 tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
return 0;
}
errCnt = PSKDemod(Cmd, TRUE);
PrintAndLog(" <invert>, 1 for invert output");
PrintAndLog(" [set maximum allowed errors], default = 100.");
PrintAndLog("");
- PrintAndLog(" sample: data psk2rawdemod = demod a psk2 tag from GraphBuffer, autodetect clock");
- PrintAndLog(" : data psk2rawdemod 32 = demod a psk2 tag from GraphBuffer using a clock of RF/32");
- PrintAndLog(" : data psk2rawdemod 32 1 = demod a psk2 tag from GraphBuffer using a clock of RF/32 and inverting output");
- PrintAndLog(" : data psk2rawdemod 1 = demod a psk2 tag from GraphBuffer, autodetect clock and invert output");
- PrintAndLog(" : data psk2rawdemod 64 1 0 = demod a psk2 tag from GraphBuffer using a clock of RF/64, inverting output and allowing 0 demod errors");
+ PrintAndLog(" sample: data rawdemod p2 = demod a psk2 tag from GraphBuffer, autodetect clock");
+ PrintAndLog(" : data rawdemod p2 32 = demod a psk2 tag from GraphBuffer using a clock of RF/32");
+ PrintAndLog(" : data rawdemod p2 32 1 = demod a psk2 tag from GraphBuffer using a clock of RF/32 and inverting output");
+ PrintAndLog(" : data rawdemod p2 1 = demod a psk2 tag from GraphBuffer, autodetect clock and invert output");
+ PrintAndLog(" : data rawdemod p2 64 1 0 = demod a psk2 tag from GraphBuffer using a clock of RF/64, inverting output and allowing 0 demod errors");
return 0;
}
errCnt=PSKDemod(Cmd, TRUE);
return 0;
}
+//zero mean GraphBuffer
int CmdHpf(const char *Cmd)
{
int i;
//{"askdemod", Cmdaskdemod, 1, "<0 or 1> -- Attempt to demodulate simple ASK tags"},
{"askedgedetect", CmdAskEdgeDetect, 1, "[threshold] Adjust Graph for manual ask demod using length of sample differences to detect the edge of a wave (default = 25)"},
{"askem410xdemod",CmdAskEM410xDemod, 1, "[clock] [invert<0|1>] [maxErr] -- Demodulate an EM410x tag from GraphBuffer (args optional)"},
+ {"askgproxiidemod",CmdG_Prox_II_Demod,1, "Demodulate a G Prox II tag from GraphBuffer"},
//{"askmandemod", Cmdaskmandemod, 1, "[clock] [invert<0|1>] [maxErr] -- Attempt to demodulate ASK/Manchester tags and output binary (args optional)"},
//{"askrawdemod", Cmdaskrawdemod, 1, "[clock] [invert<0|1>] -- Attempt to demodulate ASK tags and output bin (args optional)"},
{"autocorr", CmdAutoCorr, 1, "<window length> -- Autocorrelation over window"},
{"fskpyramiddemod",CmdFSKdemodPyramid,1, "Demodulate a Pyramid FSK tag from GraphBuffer"},
{"fskparadoxdemod",CmdFSKdemodParadox,1, "Demodulate a Paradox FSK tag from GraphBuffer"},
//{"fskrawdemod", CmdFSKrawdemod, 1, "[clock rate] [invert] [rchigh] [rclow] Demodulate graph window from FSK to bin (clock = 50)(invert = 1|0)(rchigh = 10)(rclow=8)"},
+ {"getbitstream", CmdGetBitStream, 1, "Convert GraphBuffer's >=1 values to 1 and <1 to 0"},
{"grid", CmdGrid, 1, "<x> <y> -- overlay grid on graph window, use zero value to turn off either"},
{"hexsamples", CmdHexsamples, 0, "<bytes> [<offset>] -- Dump big buffer as hex bytes"},
{"hide", CmdHide, 1, "Hide graph window"},
//{"nrzrawdemod", CmdNRZrawDemod, 1, "[clock] [invert<0|1>] [maxErr] -- Attempt to demodulate nrz tags and output binary (args optional)"},
{"plot", CmdPlot, 1, "Show graph window (hit 'h' in window for keystroke help)"},
//{"pskdetectclock",CmdDetectPSKClockRate, 1, "Detect ASK, PSK, or NRZ clock rate"},
+ {"printdemodbuffer",CmdPrintDemodBuff,1, "[x] -- print the data in the DemodBuffer - 'x' for hex output"},
{"pskindalademod",CmdIndalaDecode, 1, "[clock] [invert<0|1>] -- Demodulate an indala tag (PSK1) from GraphBuffer (args optional)"},
//{"psk1rawdemod", CmdPSK1rawDemod, 1, "[clock] [invert<0|1>] [maxErr] -- Attempt to demodulate psk1 tags and output binary (args optional)"},
//{"psk2rawdemod", CmdPSK2rawDemod, 1, "[clock] [invert<0|1>] [maxErr] -- Attempt to demodulate psk2 tags and output binary (args optional)"},
projects / proxmark3-svn / blobdiff