//
// NOTES:
// LF Demod functions are placed here to allow the flexability to use client or
-// device side. Most BUT NOT ALL of these functions are currenlty safe for
-// device side use currently. (DetectST for example...)
+// device side. Most BUT NOT ALL of these functions are currently safe for
+// device side use. (DetectST for example...)
//
// There are likely many improvements to the code that could be made, please
// make suggestions...
return bestStart[best];
}
-int DetectStrongNRZClk(uint8_t *dest, size_t size, int peak, int low){
+int DetectStrongNRZClk(uint8_t *dest, size_t size, int peak, int low, bool *strong) {
//find shortest transition from high to low
+ *strong = false;
size_t i = 0;
size_t transition1 = 0;
int lowestTransition = 255;
bool lastWasHigh = false;
-
+ size_t transitionSampleCount = 0;
//find first valid beginning of a high or low wave
while ((dest[i] >= peak || dest[i] <= low) && (i < size))
++i;
lastWasHigh = (dest[i] >= peak);
if (i-transition1 < lowestTransition) lowestTransition = i-transition1;
transition1 = i;
+ } else if (dest[i] < peak && dest[i] > low) {
+ transitionSampleCount++;
}
}
if (lowestTransition == 255) lowestTransition = 0;
if (g_debugMode==2) prnt("DEBUG NRZ: detectstrongNRZclk smallest wave: %d",lowestTransition);
+ // if less than 10% of the samples were not peaks (or 90% were peaks) then we have a strong wave
+ if (transitionSampleCount / size < 10) {
+ *strong = true;
+ lowestTransition = getClosestClock(lowestTransition);
+ }
return lowestTransition;
}
int peak, low;
if (getHiLo(dest, loopCnt, &peak, &low, 90, 90) < 1) return 0;
- int lowestTransition = DetectStrongNRZClk(dest, size-20, peak, low);
+ bool strong = false;
+ int lowestTransition = DetectStrongNRZClk(dest, size-20, peak, low, &strong);
+ if (strong) return lowestTransition;
size_t ii;
uint8_t clkCnt;
uint8_t tol = 0;
//take 01 or 10 = 1 and 11 or 00 = 0
//check for phase errors - should never have 111 or 000 should be 01001011 or 10110100 for 1010
//decodes biphase or if inverted it is AKA conditional dephase encoding AKA differential manchester encoding
-int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int offset, int invert) {
+int BiphaseRawDecode(uint8_t *BitStream, size_t *size, int *offset, int invert) {
uint16_t bitnum = 0;
uint16_t errCnt = 0;
- size_t i = offset;
+ size_t i = *offset;
uint16_t MaxBits=512;
//if not enough samples - error
if (*size < 51) return -1;
if (BitStream[i+1]==BitStream[i+2]) offsetA=0;
if (BitStream[i+2]==BitStream[i+3]) offsetB=0;
}
- if (!offsetA && offsetB) offset++;
- for (i=offset; i<*size-3; i+=2){
+ if (!offsetA && offsetB) *offset+=1;
+ for (i=*offset; i<*size-3; i+=2){
//check for phase error
if (BitStream[i+1]==BitStream[i+2]) {
BitStream[bitnum++]=7;
//by marshmellow (from holiman's base)
// full fsk demod from GraphBuffer wave to decoded 1s and 0s (no mandemod)
-int fskdemod_ext(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t invert, uint8_t fchigh, uint8_t fclow, int *startIdx) {
+int fskdemod(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t invert, uint8_t fchigh, uint8_t fclow, int *startIdx) {
+ if (justNoise(dest, size)) return 0;
// FSK demodulator
size = fsk_wave_demod(dest, size, fchigh, fclow, startIdx);
size = aggregate_bits(dest, size, rfLen, invert, fchigh, fclow, startIdx);
return size;
}
-int fskdemod(uint8_t *dest, size_t size, uint8_t rfLen, uint8_t invert, uint8_t fchigh, uint8_t fclow) {
- int startIdx=0;
- return fskdemod_ext(dest, size, rfLen, invert, fchigh, fclow, &startIdx);
-}
-
// by marshmellow
// convert psk1 demod to psk2 demod
// only transition waves are 1s
// 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, int *waveStartIdx) {
//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); // fsk2a RF/50
+ *size = fskdemod(dest, *size, 50, 1, 10, 8, waveStartIdx); // 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};
}
// 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;
-
+int HIDdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo, int *waveStartIdx) {
size_t numStart=0, size2=*size, startIdx=0;
- // FSK demodulator
- *size = fskdemod(dest, size2,50,1,10,8); //fsk2a
+ // FSK demodulator fsk2a so invert and fc/10/8
+ *size = fskdemod(dest, size2, 50, 1, 10, 8, waveStartIdx);
if (*size < 96*2) 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};
return (int)startIdx;
}
-int IOdemodFSK(uint8_t *dest, size_t size) {
- if (justNoise(dest, size)) return -1;
+int IOdemodFSK(uint8_t *dest, size_t size, int *waveStartIdx) {
//make sure buffer has data
if (size < 66*64) return -2;
- // FSK demodulator
- size = fskdemod(dest, size, 64, 1, 10, 8); // FSK2a RF/64
+ // FSK demodulator RF/64, fsk2a so invert, and fc/10/8
+ size = fskdemod(dest, size, 64, 1, 10, 8, waveStartIdx);
if (size < 65) return -3; //did we get a good demod?
//Index map
//0 10 20 30 40 50 60
}
// redesigned by marshmellow adjusted from existing decode functions
-// indala id decoding - only tested on 26 bit tags, but attempted to make it work for more
-int indala26decode(uint8_t *bitStream, size_t *size, uint8_t *invert) {
- //26 bit 40134 format (don't know other formats)
- uint8_t preamble[] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1};
- uint8_t preamble_i[] = {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,0};
- size_t startidx = 0;
- if (!preambleSearch(bitStream, preamble, sizeof(preamble), size, &startidx)){
- // if didn't find preamble try again inverting
- if (!preambleSearch(bitStream, preamble_i, sizeof(preamble_i), size, &startidx)) return -1;
+// indala id decoding
+int indala64decode(uint8_t *bitStream, size_t *size, uint8_t *invert) {
+ //standard 64 bit indala formats including 26 bit 40134 format
+ uint8_t preamble64[] = {1,0,1,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 1};
+ uint8_t preamble64_i[] = {0,1,0,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 0};
+ size_t startidx = 0;
+ size_t found_size = *size;
+ bool found = preambleSearch(bitStream, preamble64, sizeof(preamble64), &found_size, &startidx);
+ if (!found) {
+ found = preambleSearch(bitStream, preamble64_i, sizeof(preamble64_i), &found_size, &startidx);
+ if (!found) return -1;
*invert ^= 1;
- }
- if (*size != 64 && *size != 224) return -2;
+ }
+ if (found_size != 64) return -2;
if (*invert==1)
- for (size_t i = startidx; i < *size + startidx; i++)
+ for (size_t i = startidx; i < found_size + startidx; i++)
+ bitStream[i] ^= 1;
+
+ // note: don't change *size until we are sure we got it...
+ *size = found_size;
+ return (int) startidx;
+}
+
+int indala224decode(uint8_t *bitStream, size_t *size, uint8_t *invert) {
+ //large 224 bit indala formats (different preamble too...)
+ uint8_t preamble224[] = {1,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,1};
+ uint8_t preamble224_i[] = {0,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,1, 1,1,1,0};
+ size_t startidx = 0;
+ size_t found_size = *size;
+ bool found = preambleSearch(bitStream, preamble224, sizeof(preamble224), &found_size, &startidx);
+ if (!found) {
+ found = preambleSearch(bitStream, preamble224_i, sizeof(preamble224_i), &found_size, &startidx);
+ if (!found) return -1;
+ *invert ^= 1;
+ }
+ if (found_size != 224) return -2;
+ if (*invert==1 && startidx > 0)
+ for (size_t i = startidx-1; i < found_size + startidx + 2; i++)
bitStream[i] ^= 1;
+ // 224 formats are typically PSK2 (afaik 2017 Marshmellow)
+ // note loses 1 bit at beginning of transformation...
+ // don't need to verify array is big enough as to get here there has to be a full preamble after all of our data
+ psk1TOpsk2(bitStream + (startidx-1), found_size+2);
+ startidx++;
+
+ *size = found_size;
return (int) startidx;
}
// loop to get raw paradox waveform then FSK demodulate the TAG ID from it
-int ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo) {
- if (justNoise(dest, *size)) return -1;
-
+int ParadoxdemodFSK(uint8_t *dest, size_t *size, uint32_t *hi2, uint32_t *hi, uint32_t *lo, int *waveStartIdx) {
size_t numStart=0, size2=*size, startIdx=0;
// FSK demodulator
- *size = fskdemod(dest, size2,50,1,10,8); //fsk2a
+ *size = fskdemod(dest, size2,50,1,10,8,waveStartIdx); //fsk2a
if (*size < 96) return -2;
// 00001111 bit pattern represent start of frame, 01 pattern represents a 0 and 10 represents a 1
// by marshmellow
// FSK Demod then try to locate a Farpointe Data (pyramid) ID
-int PyramiddemodFSK(uint8_t *dest, size_t *size) {
+int PyramiddemodFSK(uint8_t *dest, size_t *size, int *waveStartIdx) {
//make sure buffer has data
if (*size < 128*50) return -5;
- //test samples are not just noise
- if (justNoise(dest, *size)) return -1;
-
// FSK demodulator
- *size = fskdemod(dest, *size, 50, 1, 10, 8); // fsk2a RF/50
+ *size = fskdemod(dest, *size, 50, 1, 10, 8, waveStartIdx); // 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};
projects / proxmark3-svn / blobdiff