X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/8c65b650e877a493ed17cc895d4b0be5d2fa977a..bb42a03ef1318442fa0e8e2e07c7dbf8bd49fc96:/common/lfdemod.c diff --git a/common/lfdemod.c b/common/lfdemod.c index 1b499158..88a250d8 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -12,6 +12,18 @@ #include #include "lfdemod.h" + +uint8_t justNoise(uint8_t *BitStream, size_t size) +{ + static const uint8_t THRESHOLD = 123; + //test samples are not just noise + uint8_t justNoise1 = 1; + for(size_t idx=0; idx < size && justNoise1 ;idx++){ + justNoise1 = BitStream[idx] < THRESHOLD; + } + return justNoise1; +} + //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) @@ -29,59 +41,82 @@ int getHiLo(uint8_t *BitStream, size_t size, int *high, int *low, uint8_t fuzzHi return 1; } +// 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 +uint8_t parityTest(uint32_t bits, uint8_t bitLen, uint8_t pType) +{ + uint8_t ans = 0; + for (uint8_t i = 0; i < bitLen; i++){ + ans ^= ((bits >> i) & 1); + } + //PrintAndLog("DEBUG: ans: %d, ptype: %d",ans,pType); + return (ans == pType); +} + +//by marshmellow +//search for given preamble in given BitStream and return startIndex and length +uint8_t preambleSearch(uint8_t *BitStream, uint8_t *preamble, size_t pLen, size_t *size, size_t *startIdx) +{ + uint8_t foundCnt=0; + for (int idx=0; idx < *size - pLen; idx++){ + if (memcmp(BitStream+idx, preamble, pLen) == 0){ + //first index found + foundCnt++; + if (foundCnt == 1){ + *startIdx = idx; + } + if (foundCnt == 2){ + *size = idx - *startIdx; + return 1; + } + } + } + return 0; +} + + //by marshmellow //takes 1s and 0s and searches for EM410x format - output EM ID uint64_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx) { - //no arguments needed - built this way in case we want this to be a direct call from "data " cmds in the future - // otherwise could be a void with no arguments - //set defaults - uint64_t lo=0; - uint32_t i = 0; - if (BitStream[10]>1){ //allow only 1s and 0s - // PrintAndLog("no data found"); - return 0; - } - uint8_t parityTest=0; - // 111111111 bit pattern represent start of frame - uint8_t frame_marker_mask[] = {1,1,1,1,1,1,1,1,1}; - uint32_t idx = 0; - uint32_t ii=0; - uint8_t resetCnt = 0; - while( (idx + 64) < *size) { - restart: - // search for a start of frame marker - if ( memcmp(BitStream+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) - { // frame marker found - *startIdx=idx; - idx+=9; - for (i=0; i<10;i++){ - for(ii=0; ii<5; ++ii){ - parityTest ^= BitStream[(i*5)+ii+idx]; - } - if (!parityTest){ //even parity - parityTest=0; - for (ii=0; ii<4;++ii){ - lo=(lo<<1LL)|(BitStream[(i*5)+ii+idx]); - } - //PrintAndLog("DEBUG: EM parity passed parity val: %d, i:%d, ii:%d,idx:%d, Buffer: %d%d%d%d%d,lo: %d",parityTest,i,ii,idx,BitStream[idx+ii+(i*5)-5],BitStream[idx+ii+(i*5)-4],BitStream[idx+ii+(i*5)-3],BitStream[idx+ii+(i*5)-2],BitStream[idx+ii+(i*5)-1],lo); - }else {//parity failed - //PrintAndLog("DEBUG: EM parity failed parity val: %d, i:%d, ii:%d,idx:%d, Buffer: %d%d%d%d%d",parityTest,i,ii,idx,BitStream[idx+ii+(i*5)-5],BitStream[idx+ii+(i*5)-4],BitStream[idx+ii+(i*5)-3],BitStream[idx+ii+(i*5)-2],BitStream[idx+ii+(i*5)-1]); - parityTest=0; - idx-=8; - if (resetCnt>5)return 0; //try 5 times - resetCnt++; - goto restart;//continue; - } - } - //skip last 5 bit parity test for simplicity. - *size = 64; - return lo; - }else{ - idx++; - } - } - return 0; + //no arguments needed - built this way in case we want this to be a direct call from "data " cmds in the future + // otherwise could be a void with no arguments + //set defaults + uint64_t lo=0; + uint32_t i = 0; + if (BitStream[1]>1){ //allow only 1s and 0s + // PrintAndLog("no data found"); + return 0; + } + // 111111111 bit pattern represent start of frame + uint8_t preamble[] = {1,1,1,1,1,1,1,1,1}; + uint32_t idx = 0; + uint32_t parityBits = 0; + uint8_t errChk = 0; + *startIdx = 0; + for (uint8_t extraBitChk=0; extraBitChk<5; extraBitChk++){ + errChk = preambleSearch(BitStream+extraBitChk+*startIdx, preamble, sizeof(preamble), size, startIdx); + if (errChk == 0) return 0; + idx = *startIdx + 9; + for (i=0; i<10;i++){ //loop through 10 sets of 5 bits (50-10p = 40 bits) + parityBits = bytebits_to_byte(BitStream+(i*5)+idx,5); + //check even parity + if (parityTest(parityBits, 5, 0) == 0){ + //parity failed try next bit (in the case of 1111111111) but last 9 = preamble + startIdx++; + errChk = 0; + break; + } + for (uint8_t ii=0; ii<4; ii++){ + lo = (lo << 1LL) | (BitStream[(i*5)+ii+idx]); + } + } + if (errChk != 0) return lo; + //skip last 5 bit parity test for simplicity. + // *size = 64; + } + return 0; } //by marshmellow @@ -537,114 +572,69 @@ int fskdemod(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t invert, uint8_t size = aggregate_bits(dest, size, rfLen, 192, invert, fchigh, fclow); return size; } + // loop to get raw HID waveform then FSK demodulate the TAG ID from it int HIDdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo) { + if (justNoise(dest, *size)) return -1; - size_t idx=0, size2=*size, startIdx=0; - // FSK demodulator - - *size = fskdemod(dest, size2,50,0,10,8); - - // final loop, go over previously decoded manchester data and decode into usable tag ID - // 111000 bit pattern represent start of frame, 01 pattern represents a 1 and 10 represents a 0 - uint8_t frame_marker_mask[] = {1,1,1,0,0,0}; - int numshifts = 0; - idx = 0; - //one scan - while( idx + sizeof(frame_marker_mask) < *size) { - // search for a start of frame marker - if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) - { // frame marker found - startIdx=idx; - idx+=sizeof(frame_marker_mask); - while(dest[idx] != dest[idx+1] && idx < *size-2) - { - // Keep going until next frame marker (or error) - // Shift in a bit. Start by shifting high registers - *hi2 = (*hi2<<1)|(*hi>>31); - *hi = (*hi<<1)|(*lo>>31); - //Then, shift in a 0 or one into low - if (dest[idx] && !dest[idx+1]) // 1 0 - *lo=(*lo<<1)|0; - else // 0 1 - *lo=(*lo<<1)|1; - numshifts++; - idx += 2; - } - // Hopefully, we read a tag and hit upon the next frame marker - if(idx + sizeof(frame_marker_mask) < *size) - { - if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) - { - //good return - *size=idx-startIdx; - return startIdx; - } - } - // reset - *hi2 = *hi = *lo = 0; - numshifts = 0; - }else { - idx++; - } - } - return -1; + size_t numStart=0, size2=*size, startIdx=0; + // FSK demodulator + *size = fskdemod(dest, size2,50,1,10,8); //fsk2a + if (*size < 96) return -2; + // 00011101 bit pattern represent start of frame, 01 pattern represents a 0 and 10 represents a 1 + uint8_t preamble[] = {0,0,0,1,1,1,0,1}; + // find bitstring in array + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -3; //preamble not found + + numStart = startIdx + sizeof(preamble); + // final loop, go over previously decoded FSK data and manchester decode into usable tag ID + for (size_t idx = numStart; (idx-numStart) < *size - sizeof(preamble); idx+=2){ + if (dest[idx] == dest[idx+1]){ + return -4; //not manchester data + } + *hi2 = (*hi2<<1)|(*hi>>31); + *hi = (*hi<<1)|(*lo>>31); + //Then, shift in a 0 or one into low + if (dest[idx] && !dest[idx+1]) // 1 0 + *lo=(*lo<<1)|1; + else // 0 1 + *lo=(*lo<<1)|0; + } + return (int)startIdx; } // loop to get raw paradox waveform then FSK demodulate the TAG ID from it -size_t ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo) +int ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo) { - - size_t idx=0, size2=*size; + if (justNoise(dest, *size)) return -1; + + size_t numStart=0, size2=*size, startIdx=0; // FSK demodulator - - *size = fskdemod(dest, size2,50,1,10,8); - - // final loop, go over previously decoded manchester data and decode into usable tag ID - // 00001111 bit pattern represent start of frame, 01 pattern represents a 1 and 10 represents a 0 - uint8_t frame_marker_mask[] = {0,0,0,0,1,1,1,1}; - uint16_t numshifts = 0; - idx = 0; - //one scan - while( idx + sizeof(frame_marker_mask) < *size) { - // search for a start of frame marker - if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) - { // frame marker found - size2=idx; - idx+=sizeof(frame_marker_mask); - while(dest[idx] != dest[idx+1] && idx < *size-2) - { - // Keep going until next frame marker (or error) - // Shift in a bit. Start by shifting high registers - *hi2 = (*hi2<<1)|(*hi>>31); - *hi = (*hi<<1)|(*lo>>31); - //Then, shift in a 0 or one into low - if (dest[idx] && !dest[idx+1]) // 1 0 - *lo=(*lo<<1)|1; - else // 0 1 - *lo=(*lo<<1)|0; - numshifts++; - idx += 2; - } - // Hopefully, we read a tag and hit upon the next frame marker and got enough bits - if(idx + sizeof(frame_marker_mask) < *size && numshifts > 40) - { - if ( memcmp(dest+idx, frame_marker_mask, sizeof(frame_marker_mask)) == 0) - { - //good return - return start grid position and bits found - *size = ((numshifts*2)+8); - return size2; - } - } - // reset - *hi2 = *hi = *lo = 0; - numshifts = 0; - }else { - idx++; - } + *size = fskdemod(dest, size2,50,1,10,8); //fsk2a + if (*size < 96) return -2; + + // 00001111 bit pattern represent start of frame, 01 pattern represents a 0 and 10 represents a 1 + uint8_t preamble[] = {0,0,0,0,1,1,1,1}; + + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -3; //preamble not found + + numStart = startIdx + sizeof(preamble); + // final loop, go over previously decoded FSK data and manchester decode into usable tag ID + for (size_t idx = numStart; (idx-numStart) < *size - sizeof(preamble); idx+=2){ + if (dest[idx] == dest[idx+1]) + return -4; //not manchester data + *hi2 = (*hi2<<1)|(*hi>>31); + *hi = (*hi<<1)|(*lo>>31); + //Then, shift in a 0 or one into low + if (dest[idx] && !dest[idx+1]) // 1 0 + *lo=(*lo<<1)|1; + else // 0 1 + *lo=(*lo<<1)|0; } - return 0; + return (int)startIdx; } uint32_t bytebits_to_byte(uint8_t* src, size_t numbits) @@ -660,20 +650,12 @@ uint32_t bytebits_to_byte(uint8_t* src, size_t numbits) int IOdemodFSK(uint8_t *dest, size_t size) { - static const uint8_t THRESHOLD = 129; - uint32_t idx=0; + if (justNoise(dest, size)) return -1; //make sure buffer has data - if (size < 66) 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 0; - + if (size < 66*64) return -2; // FSK demodulator - size = fskdemod(dest, size, 64, 1, 10, 8); // RF/64 and invert - if (size < 65) return -1; //did we get a good demod? + size = fskdemod(dest, size, 64, 1, 10, 8); // FSK2a RF/64 + if (size < 65) return -3; //did we get a good demod? //Index map //0 10 20 30 40 50 60 //| | | | | | | @@ -683,31 +665,17 @@ int IOdemodFSK(uint8_t *dest, size_t size) // //XSF(version)facility:codeone+codetwo //Handle the data - uint8_t mask[] = {0,0,0,0,0,0,0,0,0,1}; - for( idx=0; idx < (size - 65); idx++) { - if ( memcmp(dest + idx, mask, sizeof(mask))==0) { - //frame marker found - if (!dest[idx+8] && dest[idx+17]==1 && dest[idx+26]==1 && dest[idx+35]==1 && dest[idx+44]==1 && dest[idx+53]==1){ - //confirmed proper separator bits found - //return start position - return (int) idx; - } - } - } - 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 -uint8_t parityTest(uint32_t bits, uint8_t bitLen, uint8_t pType) -{ - uint8_t ans = 0; - for (uint8_t i = 0; i < bitLen; i++){ - ans ^= ((bits >> i) & 1); + size_t startIdx = 0; + uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,1}; + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), &size, &startIdx); + if (errChk == 0) return -4; //preamble not found + + if (!dest[startIdx+8] && dest[startIdx+17]==1 && dest[startIdx+26]==1 && dest[startIdx+35]==1 && dest[startIdx+44]==1 && dest[startIdx+53]==1){ + //confirmed proper separator bits found + //return start position + return (int) startIdx; } - //PrintAndLog("DEBUG: ans: %d, ptype: %d",ans,pType); - return (ans == pType); + return -5; } // by marshmellow @@ -735,70 +703,45 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p // by marshmellow // FSK Demod then try to locate an AWID ID -int AWIDdemodFSK(uint8_t *dest, size_t size) +int AWIDdemodFSK(uint8_t *dest, size_t *size) { - static const uint8_t THRESHOLD = 123; - uint32_t idx=0, idx2=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; + //make sure buffer has enough data + if (*size < 96*50) return -1; + + if (justNoise(dest, *size)) 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 - if (idx2 == 0) idx2=idx; - else if(idx-idx2==96) return idx2; - else return -5; - - // should always get 96 bits if it is awid - } - } - //never found mask - return -4; + *size = fskdemod(dest, *size, 50, 1, 10, 8); // fsk2a RF/50 + if (*size < 96) return -3; //did we get a good demod? + + uint8_t preamble[] = {0,0,0,0,0,0,0,1}; + size_t startIdx = 0; + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -4; //preamble not found + if (*size != 96) return -5; + return (int)startIdx; } // by marshmellow // FSK Demod then try to locate an Farpointe Data (pyramid) ID -int PyramiddemodFSK(uint8_t *dest, size_t size) +int PyramiddemodFSK(uint8_t *dest, size_t *size) { - static const uint8_t THRESHOLD = 123; - uint32_t idx=0, idx2=0; - // size_t size2 = size; //make sure buffer has data - if (size < 128*50) return -5; + 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; + if (justNoise(dest, *size)) 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 - if (idx2==0) idx2=idx; - else if (idx-idx2==128) return idx2; - else return -3; - } - } - //never found mask - return -4; + *size = fskdemod(dest, *size, 50, 1, 10, 8); // fsk2a RF/50 + if (*size < 128) return -2; //did we get a good demod? + + uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1}; + size_t startIdx = 0; + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -4; //preamble not found + if (*size != 128) return -3; + return (int)startIdx; } // by marshmellow @@ -1068,6 +1011,7 @@ int indala26decode(uint8_t *bitStream, size_t *size, uint8_t *invert) // peaks invert 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) { + if (justNoise(dest, *size)) return -1; pskCleanWave(dest,*size); int clk2 = DetectpskNRZClock(dest, *size, *clk); *clk=clk2;