From: marshmellow42 Date: Sun, 18 Jan 2015 23:13:32 +0000 (-0500) Subject: lf demod additions X-Git-Tag: v2.0.0-rc1~43^2~6 X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/commitdiff_plain/1e090a61a149a58a57e9d9acbf5e5532387867a4?ds=sidebyside lf demod additions data fskfcdetect (field clock and bit clock detect for FSK) data fskdemodawid -AWID demod/decode data fskdemodpyramid - AWID demod/decode --- diff --git a/client/cmddata.c b/client/cmddata.c index a88fa4e1..60d0d875 100644 --- a/client/cmddata.c +++ b/client/cmddata.c @@ -327,7 +327,8 @@ int Cmdmandecoderaw(const char *Cmd) //by marshmellow //biphase decode //take 01 or 10 = 0 and 11 or 00 = 1 -//takes 1 argument "offset" default = 0 if 1 it will shift the decode by one bit +//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 // since it is not like manchester and doesn't have an incorrect bit pattern we // cannot determine if our decode is correct or if it should be shifted by one bit // the argument offset allows us to manually shift if the output is incorrect @@ -339,8 +340,9 @@ int CmdBiphaseDecodeRaw(const char *Cmd) int errCnt=0; size_t size=0; int offset=0; + int invert=0; int high=0, low=0; - sscanf(Cmd, "%i", &offset); + sscanf(Cmd, "%i %i", &offset, &invert); uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0}; //get graphbuffer & high and low for (;i=20){ PrintAndLog("Too many errors attempting to decode: %d",errCnt); return 0; @@ -714,6 +716,228 @@ int CmdFSKdemodIO(const char *Cmd) DemodBufferLen=64; return 1; } + + +//by marshmellow +//AWID Prox demod - FSK RF/50 with preamble of 00000001 (always a 96 bit data stream) +//print full AWID Prox ID and some bit format details if found +int CmdFSKdemodAWID(const char *Cmd) +{ + + int verbose=1; + sscanf(Cmd, "%i", &verbose); + + //raw fsk demod no manchester decoding no start bit finding just get binary from wave + uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0}; + size_t size = getFromGraphBuf(BitStream); + + //get binary from fsk wave + int idx = AWIDdemodFSK(BitStream, size); + if (idx<=0){ + if (verbose){ + if (idx == -1) + PrintAndLog("Error: not enough samples"); + else if (idx == -2) + PrintAndLog("Error: only noise found - no waves"); + else if (idx == -3) + PrintAndLog("Error: problem during FSK demod"); + // else if (idx == -3) + // PrintAndLog("Error: thought we had a tag but the parity failed"); + else if (idx == -4) + PrintAndLog("Error: AWID preamble not found"); + } + return 0; + } + + // Index map + // 0 10 20 30 40 50 60 + // | | | | | | | + // 01234567 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 456 7 890 1 234 5 678 9 012 3 - to 96 + // ----------------------------------------------------------------------------- + // 00000001 000 1 110 1 101 1 011 1 101 1 010 0 000 1 000 1 010 0 001 0 110 1 100 0 000 1 000 1 + // premable bbb o bbb o bbw o fff o fff o ffc o ccc o ccc o ccc o ccc o ccc o wxx o xxx o xxx o - to 96 + // |---26 bit---| |-----117----||-------------142-------------| + // b = format bit len, o = odd parity of last 3 bits + // f = facility code, c = card number + // w = wiegand parity + // (26 bit format shown) + + //get raw ID before removing parities + uint32_t rawLo = bytebits_to_byte(BitStream+idx+64,32); + uint32_t rawHi = bytebits_to_byte(BitStream+idx+32,32); + uint32_t rawHi2 = bytebits_to_byte(BitStream+idx,32); + size = removeParity(BitStream, idx+8, 4, 1, 88); + if (size != 66){ + if (verbose) PrintAndLog("Error: at parity check-tag size does not match AWID format"); + return 0; + } + // ok valid card found! + + // Index map + // 0 10 20 30 40 50 60 + // | | | | | | | + // 01234567 8 90123456 7890123456789012 3 456789012345678901234567890123456 + // ----------------------------------------------------------------------------- + // 00011010 1 01110101 0000000010001110 1 000000000000000000000000000000000 + // bbbbbbbb w ffffffff cccccccccccccccc w xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx + // |26 bit| |-117--| |-----142------| + // b = format bit len, o = odd parity of last 3 bits + // f = facility code, c = card number + // w = wiegand parity + // (26 bit format shown) + + uint32_t fc = 0; + uint32_t cardnum = 0; + uint32_t code1 = 0; + uint32_t code2 = 0; + uint8_t fmtLen = bytebits_to_byte(BitStream,8); + if (fmtLen==26){ + fc = bytebits_to_byte(BitStream+9, 8); + cardnum = bytebits_to_byte(BitStream+17, 16); + code1 = bytebits_to_byte(BitStream+8,fmtLen); + PrintAndLog("AWID Found - BitLength: %d, FC: %d, Card: %d - Wiegand: %x, Raw: %x%08x%08x", fmtLen, fc, cardnum, code1, rawHi2, rawHi, rawLo); + } else { + cardnum = bytebits_to_byte(BitStream+8+(fmtLen-17), 16); + if (fmtLen>32){ + code1 = bytebits_to_byte(BitStream+8,fmtLen-32); + code2 = bytebits_to_byte(BitStream+8+(fmtLen-32),32); + PrintAndLog("AWID Found - BitLength: %d -unknown BitLength- (%d) - Wiegand: %x%08x, Raw: %x%08x%08x", fmtLen, cardnum, code1, code2, rawHi2, rawHi, rawLo); + } else{ + code1 = bytebits_to_byte(BitStream+8,fmtLen); + PrintAndLog("AWID Found - BitLength: %d -unknown BitLength- (%d) - Wiegand: %x, Raw: %x%08x%08x", fmtLen, cardnum, code1, rawHi2, rawHi, rawLo); + } + } + + //todo - convert hi2, hi, lo to demodbuffer for future sim/clone commands + + return 1; +} + +//by marshmellow +//Pyramid Prox demod - FSK RF/50 with preamble of 0000000000000001 (always a 128 bit data stream) +//print full Farpointe Data/Pyramid Prox ID and some bit format details if found +int CmdFSKdemodPyramid(const char *Cmd) +{ + + int verbose=1; + sscanf(Cmd, "%i", &verbose); + + //raw fsk demod no manchester decoding no start bit finding just get binary from wave + uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0}; + size_t size = getFromGraphBuf(BitStream); + + //get binary from fsk wave + int idx = PyramiddemodFSK(BitStream, size); + if (idx < 0){ + if (verbose){ + if (idx == -5) + PrintAndLog("Error: not enough samples"); + else if (idx == -1) + PrintAndLog("Error: only noise found - no waves"); + else if (idx == -2) + PrintAndLog("Error: problem during FSK demod"); + //else if (idx == -3) + // PrintAndLog("Error: thought we had a tag but the parity failed"); + else if (idx == -4) + PrintAndLog("Error: AWID preamble not found"); + } + PrintAndLog("idx: %d",idx); + return 0; + } + //PrintAndLog("DEBUG: idx: %d",idx); + + // Index map + // 0 10 20 30 40 50 60 + // | | | | | | | + // 0123456 7 8901234 5 6789012 3 4567890 1 2345678 9 0123456 7 8901234 5 6789012 3 + // ----------------------------------------------------------------------------- + // 0000000 0 0000000 1 0000000 1 0000000 1 0000000 1 0000000 1 0000000 1 0000000 1 + // premable xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o xxxxxxx o + + // 64 70 80 90 100 110 120 + // | | | | | | | + // 4567890 1 2345678 9 0123456 7 8901234 5 6789012 3 4567890 1 2345678 9 0123456 7 + // ----------------------------------------------------------------------------- + // 0000000 1 0000000 1 0000000 1 0110111 0 0011000 1 0000001 0 0001100 1 1001010 0 + // xxxxxxx o xxxxxxx o xxxxxxx o xswffff o ffffccc o ccccccc o ccccccw o ppppppp o + // |---115---||---------71---------| + // s = format start bit, o = odd parity of last 7 bits + // f = facility code, c = card number + // w = wiegand parity, x = extra space for other formats + // p = unknown checksum + // (26 bit format shown) + + //get raw ID before removing parities + uint32_t rawLo = bytebits_to_byte(BitStream+idx+96,32); + uint32_t rawHi = bytebits_to_byte(BitStream+idx+64,32); + uint32_t rawHi2 = bytebits_to_byte(BitStream+idx+32,32); + uint32_t rawHi3 = bytebits_to_byte(BitStream+idx,32); + size = removeParity(BitStream, idx+8, 8, 1, 120); + if (size != 105){ + if (verbose) PrintAndLog("Error: at parity check-tag size does not match Pyramid format, SIZE: %d, IDX: %d, hi3: %x",size, idx, rawHi3); + return 0; + } + + // ok valid card found! + + // Index map + // 0 10 20 30 40 50 60 70 + // | | | | | | | | + // 01234567890123456789012345678901234567890123456789012345678901234567890 + // ----------------------------------------------------------------------- + // 00000000000000000000000000000000000000000000000000000000000000000000000 + // xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx + + // 71 80 90 100 + // | | | | + // 1 2 34567890 1234567890123456 7 8901234 + // --------------------------------------- + // 1 1 01110011 0000000001000110 0 1001010 + // s w ffffffff cccccccccccccccc w ppppppp + // |--115-| |------71------| + // s = format start bit, o = odd parity of last 7 bits + // f = facility code, c = card number + // w = wiegand parity, x = extra space for other formats + // p = unknown checksum + // (26 bit format shown) + + //find start bit to get fmtLen + idx = 0; + int j; + for (j=0; j32){ + //code1 = bytebits_to_byte(BitStream+(size-fmtLen),fmtLen-32); + //code2 = bytebits_to_byte(BitStream+(size-32),32); + PrintAndLog("AWID Found - BitLength: %d -unknown BitLength- (%d), Raw: %x%08x%08x%08x", fmtLen, cardnum, rawHi3, rawHi2, rawHi, rawLo); + } else{ + //code1 = bytebits_to_byte(BitStream+(size-fmtLen),fmtLen); + PrintAndLog("AWID Found - BitLength: %d -unknown BitLength- (%d), Raw: %x%08x%08x%08x", fmtLen, cardnum, rawHi3, rawHi2, rawHi, rawLo); + } + } + //todo - convert hi2, hi, lo to demodbuffer for future sim/clone commands + + return 1; +} + int CmdFSKdemod(const char *Cmd) //old CmdFSKdemod needs updating { static const int LowTone[] = { @@ -833,6 +1057,21 @@ int CmdFSKdemod(const char *Cmd) //old CmdFSKdemod needs updating return 0; } +int CmdFSKfcDetect(const char *Cmd) +{ + uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0}; + size_t size = getFromGraphBuf(BitStream); + + + uint32_t ans = countFC(BitStream, size); + int fc1, fc2, rf1; + fc1 = (ans >> 8) & 0xFF; + fc2 = ans & 0xFF; + rf1 = (ans >>16) & 0xFF; + PrintAndLog("Detected Field Clocks: FC/%d, FC/%d - Bit Clock: RF/%d", fc1, fc2, rf1); + return 1; +} + int CmdDetectNRZpskClockRate(const char *Cmd) { GetNRZpskClock("",0,0); @@ -1560,19 +1799,22 @@ static command_t CommandTable[] = {"help", CmdHelp, 1, "This help"}, {"amp", CmdAmp, 1, "Amplify peaks"}, {"askdemod", Cmdaskdemod, 1, "<0 or 1> -- Attempt to demodulate simple ASK tags"}, - {"askmandemod", Cmdaskmandemod, 1, "[clock] [invert<0|1>] -- Attempt to demodulate ASK/Manchester tags and output binary (args optional[clock will try Auto-detect])"}, - {"askrawdemod", Cmdaskrawdemod, 1, "[clock] [invert<0|1>] -- Attempt to demodulate ASK tags and output binary (args optional[clock will try Auto-detect])"}, + {"askmandemod", Cmdaskmandemod, 1, "[clock] [invert<0|1>] -- 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, " -- Autocorrelation over window"}, - {"biphaserawdecode",CmdBiphaseDecodeRaw,1,"[offset] Biphase decode binary stream already in graph buffer (offset = bit to start decode from)"}, + {"biphaserawdecode",CmdBiphaseDecodeRaw,1,"[offset] [invert<0|1>] Biphase decode bin stream in demod buffer (offset = 0|1 bits to shift the decode start)"}, {"bitsamples", CmdBitsamples, 0, "Get raw samples as bitstring"}, {"bitstream", CmdBitstream, 1, "[clock rate] -- Convert waveform into a bitstream"}, {"buffclear", CmdBuffClear, 1, "Clear sample buffer and graph window"}, {"dec", CmdDec, 1, "Decimate samples"}, {"detectclock", CmdDetectClockRate, 1, "Detect ASK clock rate"}, {"fskdemod", CmdFSKdemod, 1, "Demodulate graph window as a HID FSK"}, - {"fskhiddemod", CmdFSKdemodHID, 1, "Demodulate graph window as a HID FSK using raw"}, - {"fskiodemod", CmdFSKdemodIO, 1, "Demodulate graph window as an IO Prox FSK using raw"}, - {"fskrawdemod", CmdFSKrawdemod, 1, "[clock rate] [invert] [rchigh] [rclow] Demodulate graph window from FSK to binary (clock = 50)(invert = 1|0)(rchigh = 10)(rclow=8)"}, + {"fskawiddemod", CmdFSKdemodAWID, 1, "Demodulate graph window as an AWID FSK tag using raw"}, + {"fskfcdetect", CmdFSKfcDetect, 1, "Try to detect the Field Clock of an FSK wave"}, + {"fskhiddemod", CmdFSKdemodHID, 1, "Demodulate graph window as a HID FSK tag using raw"}, + {"fskiodemod", CmdFSKdemodIO, 1, "Demodulate graph window as an IO Prox tag FSK using raw"}, + {"fskpyramiddemod",CmdFSKdemodPyramid,1, "Demodulate graph window as a Pyramid FSK tag using raw"}, + {"fskrawdemod", CmdFSKrawdemod, 1, "[clock rate] [invert] [rchigh] [rclow] Demodulate graph window from FSK to bin (clock = 50)(invert = 1|0)(rchigh = 10)(rclow=8)"}, {"grid", CmdGrid, 1, " -- overlay grid on graph window, use zero value to turn off either"}, {"hexsamples", CmdHexsamples, 0, " [] -- Dump big buffer as hex bytes"}, {"hide", CmdHide, 1, "Hide graph window"}, @@ -1587,8 +1829,8 @@ static command_t CommandTable[] = {"plot", CmdPlot, 1, "Show graph window (hit 'h' in window for keystroke help)"}, {"pskclean", CmdPskClean, 1, "Attempt to clean psk wave"}, {"pskdetectclock",CmdDetectNRZpskClockRate, 1, "Detect ASK, PSK, or NRZ clock rate"}, - {"pskindalademod",CmdIndalaDecode, 1, "[clock] [invert<0|1>] -- Attempt to demodulate psk indala tags and output ID binary & hex (args optional[clock will try Auto-detect])"}, - {"psknrzrawdemod",CmdpskNRZrawDemod, 1, "[clock] [invert<0|1>] -- Attempt to demodulate psk or nrz tags and output binary (args optional[clock will try Auto-detect])"}, + {"pskindalademod",CmdIndalaDecode, 1, "[clock] [invert<0|1>] -- Attempt to demodulate psk indala tags and output ID binary & hex (args optional)"}, + {"psknrzrawdemod",CmdpskNRZrawDemod, 1, "[clock] [invert<0|1>] -- Attempt to demodulate psk or nrz tags and output binary (args optional)"}, {"samples", CmdSamples, 0, "[512 - 40000] -- Get raw samples for graph window"}, {"save", CmdSave, 1, " -- Save trace (from graph window)"}, {"scale", CmdScale, 1, " -- Set cursor display scale"}, diff --git a/client/cmddata.h b/client/cmddata.h index 8723b847..ffd6b983 100644 --- a/client/cmddata.h +++ b/client/cmddata.h @@ -26,9 +26,11 @@ int CmdBitstream(const char *Cmd); int CmdBuffClear(const char *Cmd); int CmdDec(const char *Cmd); int CmdDetectClockRate(const char *Cmd); +int CmdFSKdemodAWID(const char *Cmd); int CmdFSKdemod(const char *Cmd); int CmdFSKdemodHID(const char *Cmd); int CmdFSKdemodIO(const char *Cmd); +int CmdFSKdemodPyramid(const char *Cmd); int CmdFSKrawdemod(const char *Cmd); int CmdDetectNRZpskClockRate(const char *Cmd); int CmdpskNRZrawDemod(const char *Cmd); diff --git a/client/cmdlf.c b/client/cmdlf.c index e3361cb5..945b4557 100644 --- a/client/cmdlf.c +++ b/client/cmdlf.c @@ -388,7 +388,7 @@ static void ChkBitstream(const char *str) } } } - +//appears to attempt to simulate manchester int CmdLFSim(const char *Cmd) { int i,j; @@ -581,6 +581,16 @@ int CmdLFfind(const char *Cmd) PrintAndLog("Valid IO Prox ID Found!"); return 1; } + ans=CmdFSKdemodPyramid("0"); + if (ans>0) { + PrintAndLog("Valid Pyramid ID Found!"); + return 1; + } + ans=CmdFSKdemodAWID("0"); + if (ans>0) { + PrintAndLog("Valid AWID ID Found!"); + return 1; + } ans=CmdFSKdemodHID(""); if (ans>0) { PrintAndLog("Valid HID Prox ID Found!"); diff --git a/common/lfdemod.c b/common/lfdemod.c index 062818ef..4a80a10c 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -5,13 +5,30 @@ // at your option, any later version. See the LICENSE.txt file for the text of // the license. //----------------------------------------------------------------------------- -// Low frequency commands +// Low frequency demod/decode commands //----------------------------------------------------------------------------- #include #include #include "lfdemod.h" +//by marshmellow +//get high and low with passed in fuzz factor. also return noise test = 1 for passed or 0 for only noise +int getHiLo(uint8_t *BitStream, size_t size, int *high, int *low, uint8_t fuzzHi, uint8_t fuzzLo) +{ + *high=0; + *low=255; + // get high and low thresholds + for (int i=0; i < size; i++){ + if (BitStream[i] > *high) *high = BitStream[i]; + if (BitStream[i] < *low) *low = BitStream[i]; + } + if (*high < 123) return -1; // just noise + *high = (int)(((*high-128)*(((float)fuzzHi)/100))+128); + *low = (int)(((*low-128)*(((float)fuzzLo)/100))+128); + return 1; +} + //by marshmellow //takes 1s and 0s and searches for EM410x format - output EM ID uint64_t Em410xDecode(uint8_t *BitStream, size_t size) @@ -72,7 +89,6 @@ uint64_t Em410xDecode(uint8_t *BitStream, size_t size) int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) { int i; - int high = 0, low = 255; *clk=DetectASKClock(BinStream, *size, *clk); //clock default if (*clk<8) *clk =64; @@ -81,22 +97,12 @@ int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) uint32_t initLoopMax = 200; if (initLoopMax > *size) initLoopMax=*size; // Detect high and lows - for (i = 0; i < initLoopMax; ++i) //200 samples should be enough to find high and low values - { - if (BinStream[i] > high) - high = BinStream[i]; - else if (BinStream[i] < low) - low = BinStream[i]; - } - if ((high < 129) ){ //throw away static (anything < 1 graph) - //PrintAndLog("no data found"); - return -2; - } - //25% fuzz in case highs and lows aren't clipped [marshmellow] - high=(int)(((high-128)*.75)+128); - low= (int)(((low-128)*.75)+128); + // 25% fuzz in case highs and lows aren't clipped [marshmellow] + int high, low, ans; + ans = getHiLo(BinStream, initLoopMax, &high, &low, 75, 75); + if (ans<1) return -2; //just noise - //PrintAndLog("DEBUG - valid high: %d - valid low: %d",high,low); + // PrintAndLog("DEBUG - valid high: %d - valid low: %d",high,low); int lastBit = 0; //set first clock check uint32_t bitnum = 0; //output counter int tol = 0; //clock tolerance adjust - waves will be accepted as within the clock if they fall + or - this value + clock from last valid wave @@ -108,13 +114,13 @@ int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) uint32_t bestStart = *size; uint32_t bestErrCnt = (*size/1000); uint32_t maxErr = (*size/1000); - //PrintAndLog("DEBUG - lastbit - %d",lastBit); - //loop to find first wave that works + // PrintAndLog("DEBUG - lastbit - %d",lastBit); + // loop to find first wave that works for (iii=0; iii < gLen; ++iii){ if ((BinStream[iii] >= high) || (BinStream[iii] <= low)){ lastBit=iii-*clk; errCnt=0; - //loop through to see if this start location works + // loop through to see if this start location works for (i = iii; i < *size; ++i) { if ((BinStream[i] >= high) && ((i-lastBit) > (*clk-tol))){ lastBit+=*clk; @@ -242,17 +248,17 @@ int manrawdecode(uint8_t * BitStream, size_t *size) //by marshmellow //take 01 or 10 = 0 and 11 or 00 = 1 -int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset) +int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert) { uint8_t bitnum=0; uint32_t errCnt =0; - uint32_t i=1; + uint32_t i; i=offset; - for (;i<*size-2;i+=2){ + for (;i<*size-2; i+=2){ if((BitStream[i]==1 && BitStream[i+1]==0) || (BitStream[i]==0 && BitStream[i+1]==1)){ - BitStream[bitnum++]=1; + BitStream[bitnum++]=1^invert; } else if((BitStream[i]==0 && BitStream[i+1]==0) || (BitStream[i]==1 && BitStream[i+1]==1)){ - BitStream[bitnum++]=0; + BitStream[bitnum++]=invert; } else { BitStream[bitnum++]=77; errCnt++; @@ -271,31 +277,21 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) { uint32_t i; // int invert=0; //invert default - int high = 0, low = 255; + int clk2 = *clk; *clk=DetectASKClock(BinStream, *size, *clk); //clock default - uint8_t BitStream[502] = {0}; + //uint8_t BitStream[502] = {0}; + //HACK: if clock not detected correctly - default if (*clk<8) *clk =64; - if (*clk<32) *clk=32; + if (*clk<32 && clk2==0) *clk=32; if (*invert != 0 && *invert != 1) *invert =0; uint32_t initLoopMax = 200; if (initLoopMax > *size) initLoopMax=*size; // Detect high and lows - for (i = 0; i < initLoopMax; ++i) //200 samples should be plenty to find high and low values - { - if (BinStream[i] > high) - high = BinStream[i]; - else if (BinStream[i] < low) - low = BinStream[i]; - } - if ((high < 129)){ //throw away static high has to be more than 0 on graph. - //noise <= -10 here - // PrintAndLog("no data found"); - return -2; - } //25% fuzz in case highs and lows aren't clipped [marshmellow] - high=(int)(((high-128)*.75)+128); - low= (int)(((low-128)*.75)+128); + int high, low, ans; + ans = getHiLo(BinStream, initLoopMax, &high, &low, 75, 75); + if (ans<1) return -2; //just noise //PrintAndLog("DEBUG - valid high: %d - valid low: %d",high,low); int lastBit = 0; //set first clock check @@ -310,6 +306,7 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) uint8_t errCnt =0; uint32_t bestStart = *size; uint32_t bestErrCnt = (*size/1000); + uint32_t maxErr = bestErrCnt; uint8_t midBit=0; //PrintAndLog("DEBUG - lastbit - %d",lastBit); //loop to find first wave that works @@ -320,30 +317,30 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) for (i = iii; i < *size; ++i) { if ((BinStream[i] >= high) && ((i-lastBit)>(*clk-tol))){ lastBit+=*clk; - BitStream[bitnum] = *invert; - bitnum++; + //BitStream[bitnum] = *invert; + //bitnum++; midBit=0; } else if ((BinStream[i] <= low) && ((i-lastBit)>(*clk-tol))){ //low found and we are expecting a bar lastBit+=*clk; - BitStream[bitnum] = 1- *invert; - bitnum++; + //BitStream[bitnum] = 1- *invert; + //bitnum++; midBit=0; } else if ((BinStream[i]<=low) && (midBit==0) && ((i-lastBit)>((*clk/2)-tol))){ //mid bar? midBit=1; - BitStream[bitnum]= 1- *invert; - bitnum++; + //BitStream[bitnum]= 1- *invert; + //bitnum++; } else if ((BinStream[i]>=high) && (midBit==0) && ((i-lastBit)>((*clk/2)-tol))){ //mid bar? midBit=1; - BitStream[bitnum]= *invert; - bitnum++; + //BitStream[bitnum]= *invert; + //bitnum++; } else if ((i-lastBit)>((*clk/2)+tol) && (midBit==0)){ //no mid bar found midBit=1; - BitStream[bitnum]= BitStream[bitnum-1]; - bitnum++; + //BitStream[bitnum]= BitStream[bitnum-1]; + //bitnum++; } else { //mid value found or no bar supposed to be here @@ -351,45 +348,94 @@ int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert) //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++; - } + //if (bitnum > 0){ + // BitStream[bitnum]=77; + // bitnum++; + //} errCnt++; lastBit+=*clk;//skip over until hit too many errors if (errCnt > ((*size/1000))){ //allow 1 error for every 1000 samples else start over errCnt=0; - bitnum=0;//start over + // bitnum=0;//start over break; } } } - if (bitnum>500) break; + if ((i-iii)>(500 * *clk)) break; //got enough bits } //we got more than 64 good bits and not all errors - if ((bitnum > (64+errCnt)) && (errCnt<(*size/1000))) { + if ((((i-iii)/ *clk) > (64+errCnt)) && (errCnt<(*size/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==0){ + bestStart=iii; + bestErrCnt=errCnt; + break; //great read - finish + } if (errCnt=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 < (*size/1000)) iii=bestStart; - } } - if (bitnum>16){ - for (i=0; i < bitnum; ++i){ - BinStream[i]=BitStream[i]; + if (bestErrCnt= high) && ((i-lastBit) > (*clk-tol))){ + lastBit += *clk; + BinStream[bitnum] = *invert; + bitnum++; + midBit=0; + } else if ((BinStream[i] <= low) && ((i-lastBit) > (*clk-tol))){ + //low found and we are expecting a bar + lastBit+=*clk; + BinStream[bitnum] = 1-*invert; + bitnum++; + midBit=0; + } else if ((BinStream[i]<=low) && (midBit==0) && ((i-lastBit)>((*clk/2)-tol))){ + //mid bar? + midBit=1; + BinStream[bitnum] = 1 - *invert; + bitnum++; + } else if ((BinStream[i]>=high) && (midBit==0) && ((i-lastBit)>((*clk/2)-tol))){ + //mid bar? + midBit=1; + BinStream[bitnum] = *invert; + bitnum++; + } else if ((i-lastBit)>((*clk/2)+tol) && (midBit==0)){ + //no mid bar found + midBit=1; + if (bitnum!=0) BinStream[bitnum] = BinStream[bitnum-1]; + 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){ + BinStream[bitnum]=77; + bitnum++; + } + + lastBit+=*clk;//skip over error + } + } + if (bitnum >=400) break; } *size=bitnum; - } else return -1; - return errCnt; + } else{ + *invert=bestStart; + *clk=iii; + return -1; + } + return bestErrCnt; } //translate wave to 11111100000 (1 for each short wave 0 for each long wave) size_t fsk_wave_demod(uint8_t * dest, size_t size, uint8_t fchigh, uint8_t fclow) @@ -589,37 +635,128 @@ int IOdemodFSK(uint8_t *dest, size_t size) return 0; } +// by marshmellow +// pass bits to be tested in bits, length bits passed in bitLen, and parity type (even=0 | odd=1) in pType +// returns 1 if passed +int parityTest(uint32_t bits, uint8_t bitLen, uint8_t pType) +{ + uint8_t ans = 0; + for (int i = 0; i < bitLen; i++){ + ans ^= ((bits >> i) & 1); + } + //PrintAndLog("DEBUG: ans: %d, ptype: %d",ans,pType); + return (ans == pType); +} + +// by marshmellow +// takes a array of binary values, start position, length of bits per parity (includes parity bit), +// Parity Type (1 for odd 0 for even), and binary Length (length to run) +size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t pType, size_t bLen) +{ + uint32_t parityWd = 0; + size_t j = 0, bitCnt = 0; + for (int word = 0; word < (bLen); word+=pLen){ + for (int bit=0; bit < pLen; bit++){ + parityWd = (parityWd << 1) | BitStream[startIdx+word+bit]; + BitStream[j++] = (BitStream[startIdx+word+bit]); + } + j--; + // if parity fails then return 0 + if (parityTest(parityWd, pLen, pType) == 0) return -1; + bitCnt+=(pLen-1); + parityWd = 0; + } + // if we got here then all the parities passed + //return ID start index and size + return bitCnt; +} + +// by marshmellow +// FSK Demod then try to locate an AWID ID +int AWIDdemodFSK(uint8_t *dest, size_t size) +{ + static const uint8_t THRESHOLD = 123; + uint32_t idx=0; + //make sure buffer has data + if (size < 96*50) return -1; + //test samples are not just noise + uint8_t justNoise = 1; + for(idx=0; idx < size && justNoise ;idx++){ + justNoise = dest[idx] < THRESHOLD; + } + if(justNoise) return -2; + + // FSK demodulator + size = fskdemod(dest, size, 50, 1, 10, 8); // RF/64 and invert + if (size < 96) return -3; //did we get a good demod? + + uint8_t mask[] = {0,0,0,0,0,0,0,1}; + for( idx=0; idx < (size - 96); idx++) { + if ( memcmp(dest + idx, mask, sizeof(mask))==0) { + // frame marker found + //return ID start index and size + return idx; + //size should always be 96 + } + } + //never found mask + return -4; +} + +// by marshmellow +// FSK Demod then try to locate an Farpointe Data (pyramid) ID +int PyramiddemodFSK(uint8_t *dest, size_t size) +{ + static const uint8_t THRESHOLD = 123; + uint32_t idx=0; + // size_t size2 = size; + //make sure buffer has data + if (size < 128*50) return -5; + //test samples are not just noise + uint8_t justNoise = 1; + for(idx=0; idx < size && justNoise ;idx++){ + justNoise = dest[idx] < THRESHOLD; + } + if(justNoise) return -1; + + // FSK demodulator + size = fskdemod(dest, size, 50, 1, 10, 8); // RF/64 and invert + if (size < 128) return -2; //did we get a good demod? + + uint8_t mask[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1}; + for( idx=0; idx < (size - 128); idx++) { + if ( memcmp(dest + idx, mask, sizeof(mask))==0) { + // frame marker found + return idx; + } + } + //never found mask + return -4; +} + // by marshmellow // not perfect especially with lower clocks or VERY good antennas (heavy wave clipping) // maybe somehow adjust peak trimming value based on samples to fix? int DetectASKClock(uint8_t dest[], size_t size, int clock) { int i=0; - int peak=0; - int low=255; - int clk[]={16,32,40,50,64,100,128,256}; + int clk[]={8,16,32,40,50,64,100,128,256}; int loopCnt = 256; //don't need to loop through entire array... if (size peak){ - peak = dest[i]; - } - if(dest[i] < low){ - low = dest[i]; - } - } - peak=(int)(((peak-128)*.75)+128); - low= (int)(((low-128)*.75)+128); + int peak, low; + getHiLo(dest, loopCnt, &peak, &low, 75, 75); + int ii; int clkCnt; int tol = 0; - int bestErr[]={1000,1000,1000,1000,1000,1000,1000,1000}; + int bestErr[]={1000,1000,1000,1000,1000,1000,1000,1000,1000}; int errCnt=0; //test each valid clock from smallest to greatest to see which lines up for(clkCnt=0; clkCnt < 6; ++clkCnt){ @@ -651,7 +788,7 @@ int DetectASKClock(uint8_t dest[], size_t size, int clock) } int iii=0; int best=0; - for (iii=0; iii<7;++iii){ + for (iii=0; iii<8;++iii){ if (bestErr[iii] peak){ - peak = dest[i]; - } - if(dest[i] < low){ - low = dest[i]; - } - } - peak=(int)(((peak-128)*.75)+128); - low= (int)(((low-128)*.75)+128); + int peak, low; + getHiLo(dest, loopCnt, &peak, &low, 75, 75); + //PrintAndLog("DEBUG: peak: %d, low: %d",peak,low); int ii; uint8_t clkCnt; @@ -698,7 +826,7 @@ int DetectpskNRZClock(uint8_t dest[], size_t size, int clock) int peaksdet[]={0,0,0,0,0,0,0,0,0}; //test each valid clock from smallest to greatest to see which lines up for(clkCnt=0; clkCnt < 6; ++clkCnt){ - if (clk[clkCnt] == 32){ + if (clk[clkCnt] >= 32){ tol=1; }else{ tol=0; @@ -749,40 +877,37 @@ int DetectpskNRZClock(uint8_t dest[], size_t size, int clock) } //by marshmellow (attempt to get rid of high immediately after a low) -void pskCleanWave(uint8_t *bitStream, size_t size) +void pskCleanWave(uint8_t *BitStream, size_t size) { int i; - int low=255; - int high=0; int gap = 4; - // int loopMax = 2048; - int newLow=0; + int newLow=0; int newHigh=0; - for (i=0; i < size; ++i){ - if (bitStream[i] < low) low=bitStream[i]; - if (bitStream[i] > high) high=bitStream[i]; - } - high = (int)(((high-128)*.80)+128); - low = (int)(((low-128)*.90)+128); - //low = (uint8_t)(((int)(low)-128)*.80)+128; - for (i=0; i < size; ++i){ + int high, low; + getHiLo(BitStream, size, &high, &low, 80, 90); + + for (i=0; i < size; ++i){ if (newLow == 1){ - bitStream[i]=low+8; - gap--; + if (BitStream[i]>low){ + BitStream[i]=low+8; + gap--; + } if (gap == 0){ newLow=0; gap=4; } }else if (newHigh == 1){ - bitStream[i]=high-8; - gap--; + if (BitStream[i]= high) newHigh=1; + if (BitStream[i] <= low) newLow=1; + if (BitStream[i] >= high) newHigh=1; } return; } @@ -853,7 +978,7 @@ int indala26decode(uint8_t *bitStream, size_t *size, uint8_t *invert) } -//by marshmellow - demodulate PSK wave or NRZ wave (both similar enough) +//by marshmellow - demodulate PSK1 wave or NRZ wave (both similar enough) //peaks switch bit (high=1 low=0) each clock cycle = 1 bit determined by last peak int pskNRZrawDemod(uint8_t *dest, size_t *size, int *clk, int *invert) { @@ -861,22 +986,14 @@ int pskNRZrawDemod(uint8_t *dest, size_t *size, int *clk, int *invert) int clk2 = DetectpskNRZClock(dest, *size, *clk); *clk=clk2; uint32_t i; - uint8_t high=0, low=255; + int high, low, ans; + ans = getHiLo(dest, 1260, &high, &low, 75, 80); //25% fuzz on high 20% fuzz on low + if (ans<1) return -2; //just noise uint32_t gLen = *size; - if (gLen > 1280) gLen=1280; - // get high - for (i=0; i < gLen; ++i){ - if (dest[i] > high) high = dest[i]; - if (dest[i] < low) low = dest[i]; - } - //fudge high/low bars by 25% - high = (uint8_t)((((int)(high)-128)*.75)+128); - low = (uint8_t)((((int)(low)-128)*.80)+128); - //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 + uint8_t tol = 1; //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 = 2; //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; uint8_t errCnt =0; @@ -931,7 +1048,6 @@ int pskNRZrawDemod(uint8_t *dest, size_t *size, int *clk, int *invert) bestErrCnt = errCnt; 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; @@ -995,3 +1111,169 @@ int pskNRZrawDemod(uint8_t *dest, size_t *size, int *clk, int *invert) return errCnt; } + +//by marshmellow +//countFC is to detect the field clock and bit clock rates. +//for fsk or ask not psk or nrz +uint32_t countFC(uint8_t *BitStream, size_t size) +{ + // get high/low thresholds + int high, low; + getHiLo(BitStream,10, &high, &low, 100, 100); + // get zero crossing + uint8_t zeroC = (high-low)/2+low; + uint8_t clk[]={8,16,32,40,50,64,100,128}; + uint8_t fcLens[] = {0,0,0,0,0,0,0,0,0,0}; + uint16_t fcCnts[] = {0,0,0,0,0,0,0,0,0,0}; + uint8_t rfLens[] = {0,0,0,0,0,0,0,0,0,0,0}; + // uint8_t rfCnts[] = {0,0,0,0,0,0,0,0,0,0}; + uint8_t fcLensFnd = 0; + uint8_t rfLensFnd = 0; + uint8_t lastBit=0; + uint8_t curBit=0; + uint8_t lastFCcnt=0; + uint32_t errCnt=0; + uint32_t fcCounter = 0; + uint32_t rfCounter = 0; + uint8_t firstBitFnd = 0; + int i; + + // prime i to first up transition + for (i = 1; i < size; i++) + if (BitStream[i]>=zeroC && BitStream[i-1]= zeroC){ + // new up transition + fcCounter++; + rfCounter++; + if (fcCounter > 3 && fcCounter < 256){ + //we've counted enough that it could be a valid field clock + + //if we had 5 and now have 9 then go back to 8 (for when we get a fc 9 instead of an 8) + if (lastFCcnt==5 && fcCounter==9) fcCounter--; + //if odd and not rc/5 add one (for when we get a fc 9 instead of 10) + if ((fcCounter==9 && fcCounter & 1) || fcCounter==4) fcCounter++; + + //look for bit clock (rf/xx) + if ((fcCounterlastFCcnt)){ + //not the same size as the last wave - start of new bit sequence + + if (firstBitFnd>1){ //skip first wave change - probably not a complete bit + for (int ii=0; ii<10; ii++){ + if (rfLens[ii]==rfCounter){ + //rfCnts[ii]++; + rfCounter=0; + break; + } + } + if (rfCounter>0 && rfLensFnd<10){ + //PrintAndLog("DEBUG: rfCntr %d, fcCntr %d",rfCounter,fcCounter); + //rfCnts[rfLensFnd]++; + rfLens[rfLensFnd++]=rfCounter; + } + } else { + //PrintAndLog("DEBUG i: %d",i); + firstBitFnd++; + } + rfCounter=0; + lastFCcnt=fcCounter; + } + + // save last field clock count (fc/xx) + // find which fcLens to save it to: + for (int ii=0; ii<10; ii++){ + if (fcLens[ii]==fcCounter){ + fcCnts[ii]++; + fcCounter=0; + break; + } + } + if (fcCounter>0 && fcLensFnd<10){ + //add new fc length + //PrintAndLog("FCCntr %d",fcCounter); + fcCnts[fcLensFnd]++; + fcLens[fcLensFnd++]=fcCounter; + } + } else{ + // hmmm this should not happen often - count them + errCnt++; + } + // reset counter + fcCounter=0; + } else { + // count sample + fcCounter++; + rfCounter++; + } + } + // if too many errors return errors as negative number (IS THIS NEEDED?) + if (errCnt>100) return -1*errCnt; + + uint8_t maxCnt1=0, best1=9, best2=9, best3=9, rfHighest=10, rfHighest2=10, rfHighest3=10; + + // go through fclens and find which ones are bigest 2 + for (i=0; i<10; i++){ + // PrintAndLog("DEBUG: FC %d, Cnt %d, Errs %d, RF %d",fcLens[i],fcCnts[i],errCnt,rfLens[i]); + + // get the 3 best FC values + if (fcCnts[i]>maxCnt1) { + best3=best2; + best2=best1; + maxCnt1=fcCnts[i]; + best1=i; + } else if(fcCnts[i]>fcCnts[best2]){ + best3=best2; + best2=i; + } else if(fcCnts[i]>fcCnts[best3]){ + best3=i; + } + //get highest 2 RF values (might need to get more values to compare or compare all?) + if (rfLens[i]>rfLens[rfHighest]){ + rfHighest3=rfHighest2; + rfHighest2=rfHighest; + rfHighest=i; + } else if(rfLens[i]>rfLens[rfHighest2]){ + rfHighest3=rfHighest2; + rfHighest2=i; + } else if(rfLens[i]>rfLens[rfHighest3]){ + rfHighest3=i; + } + } + + // set allowed clock remainder tolerance to be 1 large field clock length + // we could have mistakenly made a 9 a 10 instead of an 8 or visa versa so rfLens could be 1 FC off + int tol1 = (fcLens[best1]>fcLens[best2]) ? fcLens[best1] : fcLens[best2]; + + // loop to find the highest clock that has a remainder less than the tolerance + // compare samples counted divided by + int ii=7; + for (; ii>=0; ii--){ + if (rfLens[rfHighest] % clk[ii] < tol1 || rfLens[rfHighest] % clk[ii] > clk[ii]-tol1){ + if (rfLens[rfHighest2] % clk[ii] < tol1 || rfLens[rfHighest2] % clk[ii] > clk[ii]-tol1){ + if (rfLens[rfHighest3] % clk[ii] < tol1 || rfLens[rfHighest3] % clk[ii] > clk[ii]-tol1){ + break; + } + } + } + } + + if (ii<0) ii=7; // oops we went too far + + // TODO: take top 3 answers and compare to known Field clocks to get top 2 + + uint32_t fcs=0; + // PrintAndLog("DEBUG: Best %d best2 %d best3 %d, clk %d, clk2 %d",fcLens[best1],fcLens[best2],fcLens[best3],clk[i],clk[ii]); + // + + if (fcLens[best1]>fcLens[best2]){ + fcs = (((uint32_t)clk[ii])<<16) | (((uint32_t)fcLens[best1])<<8) | ((fcLens[best2])); + } else { + fcs = (((uint32_t)clk[ii])<<16) | (((uint32_t)fcLens[best2])<<8) | ((fcLens[best1])); + } + + return fcs; +} diff --git a/common/lfdemod.h b/common/lfdemod.h index b0feff04..ae04bc2f 100644 --- a/common/lfdemod.h +++ b/common/lfdemod.h @@ -4,7 +4,11 @@ // at your option, any later version. See the LICENSE.txt file for the text of // the license. //----------------------------------------------------------------------------- -// Low frequency commands +// Low frequency demod related commands +// marshmellow +// note that many of these demods are not the slickest code and they often rely +// on peaks and clock instead of converting to clean signal. +// //----------------------------------------------------------------------------- #ifndef LFDEMOD_H__ @@ -15,7 +19,7 @@ int DetectASKClock(uint8_t dest[], size_t size, int clock); int askmandemod(uint8_t *BinStream, size_t *size, int *clk, int *invert); uint64_t Em410xDecode(uint8_t *BitStream,size_t size); int manrawdecode(uint8_t *BitStream, size_t *size); -int BiphaseRawDecode(uint8_t * BitStream, size_t *size, int offset); +int BiphaseRawDecode(uint8_t * BitStream, size_t *size, int offset, int invert); int askrawdemod(uint8_t *BinStream, size_t *size, int *clk, int *invert); int HIDdemodFSK(uint8_t *dest, size_t size, uint32_t *hi2, uint32_t *hi, uint32_t *lo); int IOdemodFSK(uint8_t *dest, size_t size); @@ -25,5 +29,10 @@ int pskNRZrawDemod(uint8_t *dest, size_t *size, int *clk, int *invert); int DetectpskNRZClock(uint8_t dest[], size_t size, int clock); int indala26decode(uint8_t *bitStream, size_t *size, uint8_t *invert); void pskCleanWave(uint8_t *bitStream, size_t size); +int PyramiddemodFSK(uint8_t *dest, size_t size); +int AWIDdemodFSK(uint8_t *dest, size_t size); +size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t pType, size_t bLen); +uint32_t countFC(uint8_t *BitStream, size_t size); +int getHiLo(uint8_t *BitStream, size_t size, int *high, int *low, uint8_t fuzzHi, uint8_t fuzzLo); #endif