X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/78f59945a725db88acacc772a37f32ff6debea56..ceb34a3c1be2ebebfc5e062e39fd83ed0624fb4f:/common/lfdemod.c?ds=sidebyside diff --git a/common/lfdemod.c b/common/lfdemod.c index 56947a1a..c35ce561 100644 --- a/common/lfdemod.c +++ b/common/lfdemod.c @@ -25,15 +25,13 @@ void dummy(char *fmt, ...){} #define prnt dummy #endif -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; +//test samples are not just noise +uint8_t justNoise(uint8_t *bits, size_t size) { + #define THRESHOLD 123 + uint8_t val = 1; + for(size_t idx=0; idx < size && val ;idx++) + val = bits[idx] < THRESHOLD; + return val; } //by marshmellow @@ -73,7 +71,7 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p { uint32_t parityWd = 0; size_t j = 0, bitCnt = 0; - for (int word = 0; word < (bLen); word+=pLen){ + 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]); @@ -81,14 +79,11 @@ size_t removeParity(uint8_t *BitStream, size_t startIdx, uint8_t pLen, uint8_t p j--; // overwrite parity with next data // if parity fails then return 0 switch (pType) { - case 3: if (BitStream[j]==1) return 0; break; //should be 0 spacer bit - case 2: if (BitStream[j]==0) return 0; break; //should be 1 spacer bit - default: //test parity - if (parityTest(parityWd, pLen, pType) == 0) - return 0; - break; + case 3: if (BitStream[j]==1) { return 0; } break; //should be 0 spacer bit + case 2: if (BitStream[j]==0) { return 0; } break; //should be 1 spacer bit + default: if (parityTest(parityWd, pLen, pType) == 0) { return 0; } break; //test parity } - bitCnt+=(pLen-1); + bitCnt += (pLen-1); parityWd = 0; } // if we got here then all the parities passed @@ -172,13 +167,13 @@ uint8_t preambleSearch(uint8_t *BitStream, uint8_t *preamble, size_t pLen, size_ //by marshmellow //takes 1s and 0s and searches for EM410x format - output EM ID -uint8_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_t *hi, uint64_t *lo) +int Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_t *hi, uint64_t *lo) { //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 uint32_t i = 0; - if (BitStream[1]>1) return 0; //allow only 1s and 0s + if (BitStream[1]>1) return -1; //allow only 1s and 0s // 111111111 bit pattern represent start of frame // include 0 in front to help get start pos @@ -189,14 +184,15 @@ uint8_t Em410xDecode(uint8_t *BitStream, size_t *size, size_t *startIdx, uint32_ uint8_t FmtLen = 10; *startIdx = 0; errChk = preambleSearch(BitStream, preamble, sizeof(preamble), size, startIdx); - if (errChk == 0 || *size < 64) return 0; + if (errChk == 0 ) return -4; + if (*size < 64) return -3; if (*size > 64) FmtLen = 22; *startIdx += 1; //get rid of 0 from preamble idx = *startIdx + 9; for (i=0; i> 63); @@ -587,7 +583,7 @@ int HIDdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32 { if (justNoise(dest, *size)) return -1; - size_t numStart=0, size2=*size, startIdx=0; + size_t numStart=0, size2 = *size, startIdx=0; // FSK demodulator *size = fskdemod(dest, size2,50,1,10,8); //fsk2a if (*size < 96*2) return -2; @@ -619,7 +615,7 @@ int ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, ui { if (justNoise(dest, *size)) return -1; - size_t numStart=0, size2=*size, startIdx=0; + size_t numStart=0, size2 = *size, startIdx=0; // FSK demodulator *size = fskdemod(dest, size2,50,1,10,8); //fsk2a if (*size < 96) return -2; @@ -681,7 +677,6 @@ int IOdemodFSK(uint8_t *dest, size_t size) int VikingDemod_AM(uint8_t *dest, size_t *size) { //make sure buffer has data if (*size < 64*2) return -2; - size_t startIdx = 0; uint8_t preamble[] = {1,1,1,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); @@ -697,67 +692,77 @@ int VikingDemod_AM(uint8_t *dest, size_t *size) { if ( checkCalc != 0xA8 ) return -5; if (*size != 64) return -6; //return start position - return (int) startIdx; + return (int)startIdx; } +// by iceman +// find Visa2000 preamble in already demoded data +int Visa2kDemod_AM(uint8_t *dest, size_t *size) { + if (*size < 96*2) return -1; //make sure buffer has data + size_t startIdx = 0; + uint8_t preamble[] = {0,1,0,1,0,1,1,0,0,1,0,0,1,0,0,1,0,1,0,1,0,0,1,1,0,0,1,1,0,0,1,0}; + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -2; //preamble not found + if (*size != 96) return -3; //wrong demoded size + //return start position + return (int)startIdx; +} +// by iceman +// find Noralsy preamble in already demoded data +int NoralsyDemod_AM(uint8_t *dest, size_t *size) { + if (*size < 96*2) return -1; //make sure buffer has data + size_t startIdx = 0; + uint8_t preamble[] = {1,0,1,1,1,0,1,1,0,0,0,0}; + uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); + if (errChk == 0) return -2; //preamble not found + if (*size != 96) return -3; //wrong demoded size + //return start position + return (int)startIdx; +} // find presco preamble 0x10D in already demoded data int PrescoDemod(uint8_t *dest, size_t *size) { - //make sure buffer has data - if (*size < 64*2) return -2; - + if (*size < 128*2) return -1; //make sure buffer has data size_t startIdx = 0; - uint8_t preamble[] = {1,0,0,0,0,1,1,0,1,0,0,0,0,0,0,0,0,0,0,0}; + uint8_t preamble[] = {0,0,0,1,0,0,0,0,1,1,0,1,0,0,0,0,0,0,0,0,0,0,0}; uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); - if (errChk == 0) return -4; //preamble not found + if (errChk == 0) return -2; //preamble not found + if (*size != 128) return -3; //wrong demoded size //return start position - return (int) startIdx; + return (int)startIdx; } // Ask/Biphase Demod then try to locate an ISO 11784/85 ID // BitStream must contain previously askrawdemod and biphasedemoded data -int FDXBdemodBI(uint8_t *dest, size_t *size) -{ - //make sure buffer has enough data - if (*size < 128) return -1; - +int FDXBdemodBI(uint8_t *dest, size_t *size) { + if (*size < 128*2) return -1; //make sure buffer has enough data size_t startIdx = 0; uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,0,1}; - uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); if (errChk == 0) return -2; //preamble not found + if (*size != 128) return -3; //wrong demoded size + //return start position return (int)startIdx; } // ASK/Diphase fc/64 (inverted Biphase) // Note: this i s not a demod, this is only a detection // the parameter *dest needs to be demoded before call +// 0xFFFF preamble, 64bits int JablotronDemod(uint8_t *dest, size_t *size){ - //make sure buffer has enough data - if (*size < 64) return -1; - + if (*size < 64*2) return -1; //make sure buffer has enough data size_t startIdx = 0; - // 0xFFFF preamble, 64bits - uint8_t preamble[] = { - 1,1,1,1, - 1,1,1,1, - 1,1,1,1, - 1,1,1,1, - 0 - }; - + uint8_t preamble[] = {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0}; uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); - if (errChk == 0) return -4; //preamble not found - if (*size != 64) return -3; + if (errChk == 0) return -2; //preamble not found + if (*size != 64) return -3; // wrong demoded size uint8_t checkchksum = 0; for (int i=16; i < 56; i += 8) { checkchksum += bytebits_to_byte(dest+startIdx+i,8); } checkchksum ^= 0x3A; - uint8_t crc = bytebits_to_byte(dest+startIdx+56, 8); - - if ( checkchksum != crc ) return -5; + if ( checkchksum != crc ) return -5; return (int)startIdx; } @@ -796,7 +801,7 @@ int PyramiddemodFSK(uint8_t *dest, size_t *size) *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}; + uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,1}; size_t startIdx = 0; uint8_t errChk = preambleSearch(dest, preamble, sizeof(preamble), size, &startIdx); if (errChk == 0) return -4; //preamble not found