#include "lfdemod.h"
#include "usb_cmd.h"
#include "crc.h"
+#include "crc16.h"
uint8_t DemodBuffer[MAX_DEMOD_BUF_LEN];
uint8_t g_debugMode;
-int DemodBufferLen;
+size_t DemodBufferLen;
static int CmdHelp(const char *Cmd);
//set the demod buffer with given array of binary (one bit per byte)
return 1;
}
+int usage_data_printdemodbuf(){
+ PrintAndLog("Usage: data printdemodbuffer x o <offset>");
+ PrintAndLog("Options: ");
+ PrintAndLog(" h This help");
+ PrintAndLog(" x output in hex (omit for binary output)");
+ PrintAndLog(" o <offset> enter offset in # of bits");
+ return 0;
+}
+
//by marshmellow
void printDemodBuff(void)
{
int CmdPrintDemodBuff(const char *Cmd)
{
- char hex;
- char printBuff[512]={0x00};
- uint8_t numBits = DemodBufferLen & 0xFFFC;
- 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;
+ char hex[512]={0x00};
+ bool hexMode = false;
+ bool errors = false;
+ uint8_t offset = 0;
+ char cmdp = 0;
+ while(param_getchar(Cmd, cmdp) != 0x00)
+ {
+ switch(param_getchar(Cmd, cmdp))
+ {
+ case 'h':
+ case 'H':
+ return usage_data_printdemodbuf();
+ case 'x':
+ case 'X':
+ hexMode = true;
+ cmdp++;
+ break;
+ case 'o':
+ case 'O':
+ offset = param_get8(Cmd, cmdp+1);
+ if (!offset) errors = true;
+ cmdp += 2;
+ break;
+ default:
+ PrintAndLog("Unknown parameter '%c'", param_getchar(Cmd, cmdp));
+ errors = true;
+ break;
+ }
+ if(errors) break;
}
- if (hex == 'x'){
- numBits = binarraytohex(printBuff, (char *)DemodBuffer, numBits);
+ //Validations
+ if(errors) return usage_data_printdemodbuf();
+
+ int numBits = (DemodBufferLen-offset) & 0x7FC; //make sure we don't exceed our string
+
+ if (hexMode){
+ char *buf = (char *) (DemodBuffer + offset);
+ numBits = binarraytohex(hex, buf, numBits);
if (numBits==0) return 0;
- PrintAndLog("DemodBuffer: %s",printBuff);
+ PrintAndLog("DemodBuffer: %s",hex);
} else {
- printDemodBuff();
+ //setDemodBuf(DemodBuffer, DemodBufferLen-offset, offset);
+ char *bin = sprint_bin_break(DemodBuffer+offset,numBits,16);
+ PrintAndLog("DemodBuffer:\n%s",bin);
}
return 1;
}
setDemodBuf(BitStream,BitLen,0);
if (verbose || g_debugMode){
if (errCnt>0) PrintAndLog("# Errors during Demoding (shown as 7 in bit stream): %d",errCnt);
- if (askType) PrintAndLog("ASK/Manchester decoded bitstream:");
- else PrintAndLog("ASK/Raw decoded bitstream:");
+ if (askType) PrintAndLog("ASK/Manchester - Clock: %d - Decoded bitstream:",clk);
+ else PrintAndLog("ASK/Raw - Clock: %d - Decoded bitstream:",clk);
// Now output the bitstream to the scrollback by line of 16 bits
printDemodBuff();
int errCnt=0;
size_t size=0;
int invert=0;
- size_t maxErr = 20;
+ int maxErr = 20;
char cmdp = param_getchar(Cmd, 0);
if (strlen(Cmd) > 5 || cmdp == 'h' || cmdp == 'H') {
PrintAndLog("Usage: data manrawdecode [invert] [maxErr]");
int ASKbiphaseDemod(const char *Cmd, bool verbose)
{
//ask raw demod GraphBuffer first
- int offset=0, clk=0, invert=0, maxErr=0, ans=0;
- ans = sscanf(Cmd, "%i %i %i %i", &offset, &clk, &invert, &maxErr);
- if (ans>0)
- ans = ASKDemod(Cmd+1, FALSE, FALSE, 0);
- else
- ans = ASKDemod(Cmd, FALSE, FALSE, 0);
- if (!ans) {
- if (g_debugMode || verbose) PrintAndLog("Error AskDemod: %d", ans);
- return 0;
- }
+ int offset=0, clk=0, invert=0, maxErr=0;
+ sscanf(Cmd, "%i %i %i %i", &offset, &clk, &invert, &maxErr);
+
+ uint8_t BitStream[MAX_DEMOD_BUF_LEN];
+ size_t size = getFromGraphBuf(BitStream);
+ //invert here inverts the ask raw demoded bits which has no effect on the demod, but we need the pointer
+ int errCnt = askdemod(BitStream, &size, &clk, &invert, maxErr, 0, 0);
+ if ( errCnt < 0 || errCnt > maxErr ) {
+ if (g_debugMode) PrintAndLog("DEBUG: no data or error found %d, clock: %d", errCnt, clk);
+ return 0;
+ }
- //attempt to Biphase decode DemodBuffer
- size_t size = DemodBufferLen;
- uint8_t BitStream[MAX_DEMOD_BUF_LEN];
- memcpy(BitStream, DemodBuffer, DemodBufferLen);
- int errCnt = BiphaseRawDecode(BitStream, &size, offset, 0);
+ //attempt to Biphase decode BitStream
+ errCnt = BiphaseRawDecode(BitStream, &size, offset, invert);
if (errCnt < 0){
if (g_debugMode || verbose) PrintAndLog("Error BiphaseRawDecode: %d", errCnt);
return 0;
//success set DemodBuffer and return
setDemodBuf(BitStream, size, 0);
if (g_debugMode || verbose){
- PrintAndLog("Biphase Decoded using offset: %d - # errors:%d - data:",offset,errCnt);
+ PrintAndLog("Biphase Decoded using offset: %d - clock: %d - # errors:%d - data:",offset,clk,errCnt);
printDemodBuff();
}
return 1;
return 1;
}
+// FDX-B ISO11784/85 demod (aka animal tag) BIPHASE, inverted, rf/32, with preamble of 00000000001 (128bits)
+// 8 databits + 1 parity (1)
+// CIITT 16 chksum
+// NATIONAL CODE, ICAR database
+// COUNTRY CODE (ISO3166) or http://cms.abvma.ca/uploads/ManufacturersISOsandCountryCodes.pdf
+// FLAG (animal/non-animal)
+int CmdFDXBdemodBI(const char *Cmd){
+
+ int invert = 1;
+ int clk = 32;
+ int errCnt = 0;
+ int maxErr = 0;
+ uint8_t BitStream[MAX_DEMOD_BUF_LEN];
+ size_t size = getFromGraphBuf(BitStream);
+
+ errCnt = askdemod(BitStream, &size, &clk, &invert, maxErr, 0, 0);
+ if ( errCnt < 0 || errCnt > maxErr ) {
+ if (g_debugMode) PrintAndLog("DEBUG: no data or error found %d, clock: %d", errCnt, clk);
+ return 0;
+ }
+
+ errCnt = BiphaseRawDecode(BitStream, &size, maxErr, 1);
+ if (errCnt < 0 || errCnt > maxErr ) {
+ if (g_debugMode) PrintAndLog("Error BiphaseRawDecode: %d", errCnt);
+ return 0;
+ }
+
+ int preambleIndex = FDXBdemodBI(BitStream, &size);
+ if (preambleIndex < 0){
+ if (g_debugMode) PrintAndLog("Error FDXBDemod , no startmarker found :: %d",preambleIndex);
+ return 0;
+ }
+
+ setDemodBuf(BitStream, 128, preambleIndex);
+
+ // remove marker bits (1's every 9th digit after preamble) (pType = 2)
+ size = removeParity(BitStream, preambleIndex + 11, 9, 2, 117);
+ if ( size != 104 ) {
+ if (g_debugMode) PrintAndLog("Error removeParity:: %d", size);
+ return 0;
+ }
+ if (g_debugMode) {
+ char *bin = sprint_bin_break(BitStream,size,16);
+ PrintAndLog("DEBUG BinStream:\n%s",bin);
+ }
+ PrintAndLog("\nFDX-B / ISO 11784/5 Animal Tag ID Found:");
+ if (g_debugMode) PrintAndLog("Start marker %d; Size %d", preambleIndex, size);
+
+ //got a good demod
+ uint64_t NationalCode = ((uint64_t)(bytebits_to_byteLSBF(BitStream+32,6)) << 32) | bytebits_to_byteLSBF(BitStream,32);
+ uint32_t countryCode = bytebits_to_byteLSBF(BitStream+38,10);
+ uint8_t dataBlockBit = BitStream[48];
+ uint32_t reservedCode = bytebits_to_byteLSBF(BitStream+49,14);
+ uint8_t animalBit = BitStream[63];
+ uint32_t crc16 = bytebits_to_byteLSBF(BitStream+64,16);
+ uint32_t extended = bytebits_to_byteLSBF(BitStream+80,24);
+
+ uint64_t rawid = ((uint64_t)bytebits_to_byte(BitStream,32)<<32) | bytebits_to_byte(BitStream+32,32);
+ uint8_t raw[8];
+ num_to_bytes(rawid, 8, raw);
+
+ if (g_debugMode) PrintAndLog("Raw ID Hex: %s", sprint_hex(raw,8));
+
+ uint16_t calcCrc = crc16_ccitt_kermit(raw, 8);
+ PrintAndLog("Animal ID: %04u-%012llu", countryCode, NationalCode);
+ PrintAndLog("National Code: %012llu", NationalCode);
+ PrintAndLog("CountryCode: %04u", countryCode);
+ PrintAndLog("Extended Data: %s", dataBlockBit ? "True" : "False");
+ PrintAndLog("reserved Code: %u", reservedCode);
+ PrintAndLog("Animal Tag: %s", animalBit ? "True" : "False");
+ PrintAndLog("CRC: 0x%04X - [%04X] - %s", crc16, calcCrc, (calcCrc == crc16) ? "Passed" : "Failed");
+ PrintAndLog("Extended: 0x%X\n", extended);
+
+ return 1;
+}
+
+
//by marshmellow
//attempt to psk1 demod graph buffer
int PSKDemod(const char *Cmd, bool verbose)
clk=0;
}
if (invert != 0 && invert != 1) {
- if (verbose) PrintAndLog("Invalid argument: %s", Cmd);
+ if (g_debugMode || verbose) PrintAndLog("Invalid argument: %s", Cmd);
return 0;
}
uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
size_t BitLen = getFromGraphBuf(BitStream);
- if (BitLen==0) return -1;
+ if (BitLen==0) return 0;
uint8_t carrier=countFC(BitStream, BitLen, 0);
if (carrier!=2 && carrier!=4 && carrier!=8){
//invalid carrier
return 0;
}
uint8_t invert=0;
- ans = indala26decode(DemodBuffer,(size_t *) &DemodBufferLen, &invert);
+ ans = indala26decode(DemodBuffer, &DemodBufferLen, &invert);
if (ans < 1) {
if (g_debugMode==1)
PrintAndLog("Error2: %d",ans);
return 1;
}
+int CmdPSKNexWatch(const char *Cmd)
+{
+ if (!PSKDemod("", false)) return 0;
+ uint8_t preamble[28] = {0,0,0,0,0,1,0,1,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
+ size_t startIdx = 0, size = DemodBufferLen;
+ bool invert = false;
+ if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)){
+ // if didn't find preamble try again inverting
+ if (!PSKDemod("1", false)) return 0;
+ size = DemodBufferLen;
+ if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)) return 0;
+ invert = true;
+ }
+ if (size != 128) return 0;
+ setDemodBuf(DemodBuffer, size, startIdx+4);
+ startIdx = 8+32; //4 = extra i added, 8 = preamble, 32 = reserved bits (always 0)
+ //get ID
+ uint32_t ID = 0;
+ for (uint8_t wordIdx=0; wordIdx<4; wordIdx++){
+ for (uint8_t idx=0; idx<8; idx++){
+ ID = (ID << 1) | DemodBuffer[startIdx+wordIdx+(idx*4)];
+ }
+ }
+ //parity check (TBD)
+
+ //checksum check (TBD)
+
+ //output
+ PrintAndLog("NexWatch ID: %d", ID);
+ if (invert){
+ PrintAndLog("Had to Invert - probably NexKey");
+ for (uint8_t idx=0; idx<size; idx++)
+ DemodBuffer[idx] ^= 1;
+ }
+
+ CmdPrintDemodBuff("x");
+ return 1;
+}
+
// by marshmellow
// takes 3 arguments - clock, invert, maxErr as integers
// attempts to demodulate nrz only
// prints binary found and saves in demodbuffer for further commands
-
int NRZrawDemod(const char *Cmd, bool verbose)
{
int invert=0;
PrintAndLog("Unpacking...");
BitstreamOut bout = { got, bits_per_sample * n, 0};
int j =0;
- for (j = 0; j * bits_per_sample < n * 8 && j < sizeof(GraphBuffer); j++) {
+ for (j = 0; j * bits_per_sample < n * 8 && j < n; j++) {
uint8_t sample = getByte(bits_per_sample, &bout);
GraphBuffer[j] = ((int) sample )- 128;
}
{"buffclear", CmdBuffClear, 1, "Clear sample buffer and graph window"},
{"dec", CmdDec, 1, "Decimate samples"},
{"detectclock", CmdDetectClockRate, 1, "[modulation] Detect clock rate of wave in GraphBuffer (options: 'a','f','n','p' for ask, fsk, nrz, psk respectively)"},
+ {"fdxbdemod", CmdFDXBdemodBI , 1, "Demodulate a FDX-B ISO11784/85 Biphase tag from GraphBuffer"},
{"fskawiddemod", CmdFSKdemodAWID, 1, "Demodulate an AWID FSK tag from GraphBuffer"},
//{"fskfcdetect", CmdFSKfcDetect, 1, "Try to detect the Field Clock of an FSK wave"},
{"fskhiddemod", CmdFSKdemodHID, 1, "Demodulate a HID FSK tag from GraphBuffer"},
{"manrawdecode", Cmdmandecoderaw, 1, "[invert] [maxErr] -- Manchester decode binary stream in DemodBuffer"},
{"norm", CmdNorm, 1, "Normalize max/min to +/-128"},
{"plot", CmdPlot, 1, "Show graph window (hit 'h' in window for keystroke help)"},
- {"printdemodbuffer",CmdPrintDemodBuff, 1, "[x] -- print the data in the DemodBuffer - 'x' for hex output"},
+ {"printdemodbuffer",CmdPrintDemodBuff, 1, "[x] [o] <offset> -- 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)"},
+ {"psknexwatchdemod",CmdPSKNexWatch, 1, "Demodulate a NexWatch tag (nexkey, quadrakey) (PSK1) from GraphBuffer"},
{"rawdemod", CmdRawDemod, 1, "[modulation] ... <options> -see help (h option) -- Demodulate the data in the GraphBuffer and output binary"},
{"samples", CmdSamples, 0, "[512 - 40000] -- Get raw samples for graph window (GraphBuffer)"},
{"save", CmdSave, 1, "<filename> -- Save trace (from graph window)"},
projects / proxmark3-svn / blobdiff