int AskEm410xDemod(const char *Cmd, uint32_t *hi, uint64_t *lo, bool verbose)
{
- if (!ASKDemod(Cmd, FALSE, FALSE, 1)) return 0;
+ bool st = TRUE;
+ if (!ASKDemod_ext(Cmd, FALSE, FALSE, 1, &st)) return 0;
return AskEm410xDecode(verbose, hi, lo);
}
//verbose will print results and demoding messages
//emSearch will auto search for EM410x format in bitstream
//askType switches decode: ask/raw = 0, ask/manchester = 1
-int ASKDemod(const char *Cmd, bool verbose, bool emSearch, uint8_t askType)
-{
+int ASKDemod_ext(const char *Cmd, bool verbose, bool emSearch, uint8_t askType, bool *stCheck) {
int invert=0;
int clk=0;
int maxErr=100;
if (g_debugMode) PrintAndLog("DEBUG: Bitlen from grphbuff: %d",BitLen);
if (BitLen<255) return 0;
if (maxLen<BitLen && maxLen != 0) BitLen = maxLen;
-
+ int foundclk = 0;
+ bool st = false;
+ if (*stCheck) st = DetectST(BitStream, &BitLen, &foundclk);
+ if (st) {
+ *stCheck = st;
+ clk = (clk == 0) ? foundclk : clk;
+ if (verbose || g_debugMode) PrintAndLog("\nFound Sequence Terminator");
+ }
int errCnt = askdemod(BitStream, &BitLen, &clk, &invert, maxErr, askAmp, askType);
if (errCnt<0 || BitLen<16){ //if fatal error (or -1)
if (g_debugMode) PrintAndLog("DEBUG: no data found %d, errors:%d, bitlen:%d, clock:%d",errCnt,invert,BitLen,clk);
}
return 1;
}
+int ASKDemod(const char *Cmd, bool verbose, bool emSearch, uint8_t askType) {
+ bool st = false;
+ return ASKDemod_ext(Cmd, verbose, emSearch, askType, &st);
+}
//by marshmellow
//takes 5 arguments - clock, invert, maxErr, maxLen as integers and amplify as char == 'a'
{
char cmdp = param_getchar(Cmd, 0);
if (strlen(Cmd) > 25 || cmdp == 'h' || cmdp == 'H') {
- PrintAndLog("Usage: data rawdemod am [clock] <invert> [maxError] [maxLen] [amplify]");
+ PrintAndLog("Usage: data rawdemod am <s> [clock] <invert> [maxError] [maxLen] [amplify]");
+ PrintAndLog(" ['s'] optional, check for Sequence Terminator");
PrintAndLog(" [set clock as integer] optional, if not set, autodetect");
PrintAndLog(" <invert>, 1 to invert output");
PrintAndLog(" [set maximum allowed errors], default = 100");
PrintAndLog(" : data rawdemod am 64 1 0 = demod an ask/manchester tag from GraphBuffer using a clock of RF/64, inverting data and allowing 0 demod errors");
return 0;
}
+ bool st = TRUE;
+ if (Cmd[0]=='s')
+ return ASKDemod_ext(Cmd++, TRUE, TRUE, 1, &st);
+ else if (Cmd[1] == 's')
+ return ASKDemod_ext(Cmd+=2, TRUE, TRUE, 1, &st);
+ else
return ASKDemod(Cmd, TRUE, TRUE, 1);
}
int CmdG_Prox_II_Demod(const char *Cmd)
{
if (!ASKbiphaseDemod(Cmd, FALSE)){
- if (g_debugMode) PrintAndLog("ASKbiphaseDemod failed 1st try");
+ if (g_debugMode) PrintAndLog("Error gProxII: ASKbiphaseDemod failed 1st try");
return 0;
}
size_t size = DemodBufferLen;
if (g_debugMode) PrintAndLog("Error gProxII_Demod");
return 0;
}
- //got a good demod
- uint32_t ByteStream[65] = {0x00};
+ //got a good demod of 96 bits
+ uint8_t ByteStream[8] = {0x00};
uint8_t xorKey=0;
- uint8_t keyCnt=0;
- uint8_t bitCnt=0;
- uint8_t ByteCnt=0;
- size_t startIdx = ans + 6; //start after preamble
- for (size_t idx = 0; idx<size-6; idx++){
- if ((idx+1) % 5 == 0){
- //spacer bit - should be 0
- if (DemodBuffer[startIdx+idx] != 0) {
- if (g_debugMode) PrintAndLog("Error spacer not 0: %d, pos: %d",DemodBuffer[startIdx+idx],startIdx+idx);
+ size_t startIdx = ans + 6; //start after 6 bit preamble
+
+ uint8_t bits_no_spacer[90];
+ //so as to not mess with raw DemodBuffer copy to a new sample array
+ memcpy(bits_no_spacer, DemodBuffer + startIdx, 90);
+ // remove the 18 (90/5=18) parity bits (down to 72 bits (96-6-18=72))
+ size_t bitLen = removeParity(bits_no_spacer, 0, 5, 3, 90); //source, startloc, paritylen, ptype, length_to_run
+ if (bitLen != 72) {
+ if (g_debugMode) PrintAndLog("Error gProxII: spacer removal did not produce 72 bits: %u, start: %u", bitLen, startIdx);
return 0;
}
- continue;
- }
- if (keyCnt<8){ //lsb first
- xorKey = xorKey | (DemodBuffer[startIdx+idx]<<keyCnt);
- keyCnt++;
- if (keyCnt==8 && g_debugMode) PrintAndLog("xorKey Found: %02x", xorKey);
- continue;
- }
- //lsb first
- ByteStream[ByteCnt] = ByteStream[ByteCnt] | (DemodBuffer[startIdx+idx]<<bitCnt);
- bitCnt++;
- if (bitCnt % 8 == 0){
- if (g_debugMode) PrintAndLog("byte %d: %02x",ByteCnt,ByteStream[ByteCnt]);
- bitCnt=0;
- ByteCnt++;
- }
- }
- for (uint8_t i = 0; i < ByteCnt; i++){
- ByteStream[i] ^= xorKey; //xor
- if (g_debugMode) PrintAndLog("byte %d after xor: %02x", i, ByteStream[i]);
+ // get key and then get all 8 bytes of payload decoded
+ xorKey = (uint8_t)bytebits_to_byteLSBF(bits_no_spacer, 8);
+ for (size_t idx = 0; idx < 8; idx++) {
+ ByteStream[idx] = ((uint8_t)bytebits_to_byteLSBF(bits_no_spacer+8 + (idx*8),8)) ^ xorKey;
+ if (g_debugMode) PrintAndLog("byte %u after xor: %02x", (unsigned int)idx, ByteStream[idx]);
}
- //now ByteStream contains 64 bytes of decrypted raw tag data
+ //now ByteStream contains 8 Bytes (64 bits) of decrypted raw tag data
//
uint8_t fmtLen = ByteStream[0]>>2;
uint32_t FC = 0;
uint32_t Card = 0;
+ //get raw 96 bits to print
uint32_t raw1 = bytebits_to_byte(DemodBuffer+ans,32);
uint32_t raw2 = bytebits_to_byte(DemodBuffer+ans+32, 32);
uint32_t raw3 = bytebits_to_byte(DemodBuffer+ans+64, 32);
if (fmtLen==36){
FC = ((ByteStream[3] & 0x7F)<<7) | (ByteStream[4]>>1);
Card = ((ByteStream[4]&1)<<19) | (ByteStream[5]<<11) | (ByteStream[6]<<3) | (ByteStream[7]>>5);
- PrintAndLog("G-Prox-II Found: FmtLen %d, FC %d, Card %d",fmtLen,FC,Card);
+ PrintAndLog("G-Prox-II Found: FmtLen %d, FC %u, Card %u", (int)fmtLen, FC, Card);
} else if(fmtLen==26){
FC = ((ByteStream[3] & 0x7F)<<1) | (ByteStream[4]>>7);
Card = ((ByteStream[4]&0x7F)<<9) | (ByteStream[5]<<1) | (ByteStream[6]>>7);
- PrintAndLog("G-Prox-II Found: FmtLen %d, FC %d, Card %d",fmtLen,FC,Card);
+ PrintAndLog("G-Prox-II Found: FmtLen %d, FC %u, Card %u", (int)fmtLen, FC, Card);
} else {
- PrintAndLog("Unknown G-Prox-II Fmt Found: FmtLen %d",fmtLen);
+ PrintAndLog("Unknown G-Prox-II Fmt Found: FmtLen %d",(int)fmtLen);
+ PrintAndLog("Decoded Raw: %s", sprint_hex(ByteStream, 8));
}
PrintAndLog("Raw: %08x%08x%08x", raw1,raw2,raw3);
setDemodBuf(DemodBuffer+ans, 96, 0);
char *GetFSKType(uint8_t fchigh, uint8_t fclow, uint8_t invert)
{
- char *fskType;
+ static char fType[8];
+ memset(fType, 0x00, 8);
+ char *fskType = fType;
if (fchigh==10 && fclow==8){
if (invert) //fsk2a
- fskType = "FSK2a";
+ memcpy(fskType, "FSK2a", 5);
else //fsk2
- fskType = "FSK2";
+ memcpy(fskType, "FSK2", 4);
} else if (fchigh == 8 && fclow == 5) {
if (invert)
- fskType = "FSK1";
+ memcpy(fskType, "FSK1", 4);
else
- fskType = "FSK1a";
+ memcpy(fskType, "FSK1a", 5);
} else {
- fskType = "FSK??";
+ memcpy(fskType, "FSK??", 5);
}
return fskType;
}
fchigh = param_get8(Cmd, 2);
fclow = param_get8(Cmd, 3);
if (strlen(Cmd)>0 && strlen(Cmd)<=2) {
- if (rfLen==1){
+ if (rfLen==1) {
invert = 1; //if invert option only is used
rfLen = 0;
- }
+ }
}
uint8_t BitStream[MAX_GRAPH_TRACE_LEN]={0};
size_t BitLen = getFromGraphBuf(BitStream);
if (BitLen==0) return 0;
//get field clock lengths
- uint8_t fc1=0, fc2=0, rf1=0;
+ uint16_t fcs=0;
if (!fchigh || !fclow) {
- uint8_t ans = fskClocks(&fc1, &fc2, &rf1, false);
- if (ans == 0) {
- if (g_debugMode) PrintAndLog("\nError: cannot detect valid fsk field clocks");
- return 0; // can't detect field clock
+ fcs = countFC(BitStream, BitLen, 1);
+ if (!fcs) {
+ fchigh = 10;
+ fclow = 8;
+ } else {
+ fchigh = (fcs >> 8) & 0x00FF;
+ fclow = fcs & 0x00FF;
}
- fchigh = fc1;
- fclow = fc2;
- if (rfLen == 0) rfLen = rf1;
}
//get bit clock length
- if (!rfLen){
+ if (!rfLen) {
rfLen = detectFSKClk(BitStream, BitLen, fchigh, fclow);
if (!rfLen) rfLen = 50;
}
int size = fskdemod(BitStream, BitLen, rfLen, invert, fchigh, fclow);
- if (size > 0){
+ if (size > 0) {
setDemodBuf(BitStream, size, 0);
// Now output the bitstream to the scrollback by line of 16 bits
if (verbose || g_debugMode) {
- PrintAndLog("\nUsing Clock:%u, invert:%u, fchigh:%u, fclow:%u", rfLen, invert, fchigh, fclow);
+ PrintAndLog("\nUsing Clock:%u, invert:%u, fchigh:%u, fclow:%u", (unsigned int)rfLen, (unsigned int)invert, (unsigned int)fchigh, (unsigned int)fclow);
PrintAndLog("%s decoded bitstream:", GetFSKType(fchigh, fclow, invert));
printDemodBuff();
}
// 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
+ // p = CRC8maxim checksum
// (26 bit format shown)
//get bytes for checksum calc
// 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
+ // p = CRC8-Maxim checksum
// (26 bit format shown)
//find start bit to get fmtLen
int j;
- for (j=0; j<size; j++){
+ for (j=0; j < size; ++j){
if(BitStream[j]) break;
}
+
uint8_t fmtLen = size-j-8;
uint32_t fc = 0;
uint32_t cardnum = 0;
uint32_t code1 = 0;
- if (fmtLen==26){
+
+ if ( fmtLen == 26 ){
fc = bytebits_to_byte(BitStream+73, 8);
cardnum = bytebits_to_byte(BitStream+81, 16);
code1 = bytebits_to_byte(BitStream+72,fmtLen);
PrintAndLog("Pyramid ID Found - BitLength: %d, FC: %d, Card: %d - Wiegand: %x, Raw: %08x%08x%08x%08x", fmtLen, fc, cardnum, code1, rawHi3, rawHi2, rawHi, rawLo);
- } else if (fmtLen==45){
- fmtLen=42; //end = 10 bits not 7 like 26 bit fmt
+ } else if (fmtLen == 45) {
+ fmtLen = 42; //end = 10 bits not 7 like 26 bit fmt
fc = bytebits_to_byte(BitStream+53, 10);
cardnum = bytebits_to_byte(BitStream+63, 32);
PrintAndLog("Pyramid ID Found - BitLength: %d, FC: %d, Card: %d - Raw: %08x%08x%08x%08x", fmtLen, fc, cardnum, rawHi3, rawHi2, rawHi, rawLo);
} else {
cardnum = bytebits_to_byte(BitStream+81, 16);
- if (fmtLen>32){
- //code1 = bytebits_to_byte(BitStream+(size-fmtLen),fmtLen-32);
- //code2 = bytebits_to_byte(BitStream+(size-32),32);
- PrintAndLog("Pyramid ID Found - BitLength: %d -unknown BitLength- (%d), Raw: %08x%08x%08x%08x", fmtLen, cardnum, rawHi3, rawHi2, rawHi, rawLo);
- } else{
- //code1 = bytebits_to_byte(BitStream+(size-fmtLen),fmtLen);
- PrintAndLog("Pyramid ID Found - BitLength: %d -unknown BitLength- (%d), Raw: %08x%08x%08x%08x", fmtLen, cardnum, rawHi3, rawHi2, rawHi, rawLo);
- }
+ PrintAndLog("Pyramid ID Found - BitLength: %d -unknown BitLength- (%d), Raw: %08x%08x%08x%08x", fmtLen, cardnum, rawHi3, rawHi2, rawHi, rawLo);
}
if (checksum == checkCS)
PrintAndLog("Checksum %02x passed", checksum);
projects / proxmark3-svn / blobdiff