+ i = 0;
+ j = 0;
+ minClk = 255;
+ // get to first full low to prime loop and skip incomplete first pulse
+ while ((GraphBuffer[i] < high) && (i < GraphTraceLen))
+ ++i;
+ while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
+ ++i;
+ skip = i;
+
+ // populate tmpbuff buffer with pulse lengths
+ while (i < GraphTraceLen) {
+ // measure from low to low
+ while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
+ ++i;
+ start= i;
+ while ((GraphBuffer[i] < high) && (i < GraphTraceLen))
+ ++i;
+ while ((GraphBuffer[i] > low) && (i < GraphTraceLen))
+ ++i;
+ if (j>=(MAX_GRAPH_TRACE_LEN/64)) {
+ break;
+ }
+ tmpbuff[j++]= i - start;
+ if (i-start < minClk && i < GraphTraceLen) {
+ minClk = i - start;
+ }
+ }
+ // set clock
+ if (!clk) {
+ for (uint8_t clkCnt = 0; clkCnt<7; clkCnt++) {
+ tol = fndClk[clkCnt]/8;
+ if (minClk >= fndClk[clkCnt]-tol && minClk <= fndClk[clkCnt]+1) {
+ clk=fndClk[clkCnt];
+ break;
+ }
+ }
+ if (!clk) {
+ if (verbose || g_debugMode) PrintAndLog("ERROR: EM4x50 - didn't find a clock");
+ return 0;
+ }
+ } else tol = clk/8;
+
+ // look for data start - should be 2 pairs of LW (pulses of clk*3,clk*2)
+ start = -1;
+ for (i= 0; i < j - 4 ; ++i) {
+ skip += tmpbuff[i];
+ if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol) //3 clocks
+ if (tmpbuff[i+1] >= clk*2-tol && tmpbuff[i+1] <= clk*2+tol) //2 clocks
+ if (tmpbuff[i+2] >= clk*3-tol && tmpbuff[i+2] <= clk*3+tol) //3 clocks
+ if (tmpbuff[i+3] >= clk-tol) //1.5 to 2 clocks - depends on bit following
+ {
+ start= i + 4;
+ break;
+ }
+ }
+ startblock = i + 4;
+
+ // skip over the remainder of LW
+ skip += tmpbuff[i+1] + tmpbuff[i+2] + clk;
+ if (tmpbuff[i+3]>clk)
+ phaseoff = tmpbuff[i+3]-clk;
+ else
+ phaseoff = 0;
+ // now do it again to find the end
+ end = skip;
+ for (i += 3; i < j - 4 ; ++i) {
+ end += tmpbuff[i];
+ if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol) //3 clocks
+ if (tmpbuff[i+1] >= clk*2-tol && tmpbuff[i+1] <= clk*2+tol) //2 clocks
+ if (tmpbuff[i+2] >= clk*3-tol && tmpbuff[i+2] <= clk*3+tol) //3 clocks
+ if (tmpbuff[i+3] >= clk-tol) //1.5 to 2 clocks - depends on bit following
+ {
+ complete= true;
+ break;
+ }
+ }
+ end = i;
+ // report back
+ if (verbose || g_debugMode) {
+ if (start >= 0) {
+ PrintAndLog("\nNote: one block = 50 bits (32 data, 12 parity, 6 marker)");
+ } else {
+ PrintAndLog("No data found!, clock tried:%d",clk);
+ PrintAndLog("Try again with more samples.");
+ PrintAndLog(" or after a 'data askedge' command to clean up the read");
+ return 0;
+ }
+ } else if (start < 0) return 0;
+ start = skip;
+ snprintf(tmp2, sizeof(tmp2),"%d %d 1000 %d", clk, invert, clk*47);
+ // get rid of leading crap
+ snprintf(tmp, sizeof(tmp), "%i", skip);
+ CmdLtrim(tmp);
+ bool pTest;
+ bool AllPTest = true;
+ // now work through remaining buffer printing out data blocks
+ block = 0;
+ i = startblock;
+ while (block < 6) {
+ if (verbose || g_debugMode) PrintAndLog("\nBlock %i:", block);
+ skip = phaseoff;
+
+ // look for LW before start of next block
+ for ( ; i < j - 4 ; ++i) {
+ skip += tmpbuff[i];
+ if (tmpbuff[i] >= clk*3-tol && tmpbuff[i] <= clk*3+tol)
+ if (tmpbuff[i+1] >= clk-tol)
+ break;
+ }
+ if (i >= j-4) break; //next LW not found
+ skip += clk;
+ if (tmpbuff[i+1]>clk)
+ phaseoff = tmpbuff[i+1]-clk;
+ else
+ phaseoff = 0;
+ i += 2;
+ if (ASKDemod(tmp2, false, false, 1) < 1) {
+ save_restoreGB(0);
+ return 0;
+ }
+ //set DemodBufferLen to just one block
+ DemodBufferLen = skip/clk;
+ //test parities
+ pTest = EM_ByteParityTest(DemodBuffer,DemodBufferLen,5,9,0);
+ pTest &= EM_EndParityTest(DemodBuffer,DemodBufferLen,5,9,0);
+ AllPTest &= pTest;
+ //get output
+ Code[block] = OutputEM4x50_Block(DemodBuffer,DemodBufferLen,verbose, pTest);
+ if (g_debugMode) PrintAndLog("\nskipping %d samples, bits:%d", skip, skip/clk);
+ //skip to start of next block
+ snprintf(tmp,sizeof(tmp),"%i",skip);
+ CmdLtrim(tmp);
+ block++;
+ if (i >= end) break; //in case chip doesn't output 6 blocks
+ }
+ //print full code:
+ if (verbose || g_debugMode || AllPTest){
+ if (!complete) {
+ PrintAndLog("*** Warning!");
+ PrintAndLog("Partial data - no end found!");
+ PrintAndLog("Try again with more samples.");
+ }
+ PrintAndLog("Found data at sample: %i - using clock: %i", start, clk);
+ end = block;
+ for (block=0; block < end; block++){
+ PrintAndLog("Block %d: %08x",block,Code[block]);
+ }
+ if (AllPTest) {
+ PrintAndLog("Parities Passed");
+ } else {
+ PrintAndLog("Parities Failed");
+ PrintAndLog("Try cleaning the read samples with 'data askedge'");
+ }
+ }
+
+ //restore GraphBuffer
+ save_restoreGB(0);
+ return (int)AllPTest;
+}
+
+int CmdEM4x50Read(const char *Cmd) {
+ uint8_t ctmp = param_getchar(Cmd, 0);
+ if ( ctmp == 'H' || ctmp == 'h' ) return usage_lf_em4x50_read();
+ return EM4x50Read(Cmd, true);
+}
+int CmdEM4x50Write(const char *Cmd){
+ uint8_t ctmp = param_getchar(Cmd, 0);
+ if ( ctmp == 'H' || ctmp == 'h' ) return usage_lf_em4x50_write();
+ PrintAndLog("no implemented yet");
+ return 0;
+}
+int CmdEM4x50Dump(const char *Cmd){
+ uint8_t ctmp = param_getchar(Cmd, 0);
+ if ( ctmp == 'H' || ctmp == 'h' ) return usage_lf_em4x50_dump();
+ PrintAndLog("no implemented yet");
+ return 0;
+}
+
+#define EM_PREAMBLE_LEN 6
+// download samples from device and copy to Graphbuffer
+bool downloadSamplesEM(){
+
+ // 8 bit preamble + 32 bit word response (max clock (128) * 40bits = 5120 samples)
+ uint8_t got[6000];
+ GetFromBigBuf(got, sizeof(got), 0);
+ if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2500) ) {
+ PrintAndLog("command execution time out");
+ return FALSE;
+ }
+ setGraphBuf(got, sizeof(got));
+ return TRUE;
+}
+
+// em_demod
+bool doPreambleSearch(size_t *startIdx){
+
+ // sanity check
+ if ( DemodBufferLen < EM_PREAMBLE_LEN) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 demodbuffer too small");
+ return FALSE;
+ }
+
+ // set size to 20 to only test first 14 positions for the preamble
+ size_t size = (20 > DemodBufferLen) ? DemodBufferLen : 20;
+ *startIdx = 0;
+ // skip first two 0 bits as they might have been missed in the demod
+ uint8_t preamble[EM_PREAMBLE_LEN] = {0,0,1,0,1,0};
+
+ if ( !preambleSearchEx(DemodBuffer, preamble, EM_PREAMBLE_LEN, &size, startIdx, TRUE)) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", *startIdx);
+ return FALSE;
+ }
+ return TRUE;
+}
+
+bool detectFSK(){
+ // detect fsk clock
+ if (!GetFskClock("", FALSE, FALSE)) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - EM: FSK clock failed");
+ return FALSE;
+ }
+ // demod
+ int ans = FSKrawDemod("0 0", FALSE);
+ if (!ans) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - EM: FSK Demod failed");
+ return FALSE;
+ }
+ return TRUE;
+}
+// PSK clocks should be easy to detect ( but difficult to demod a non-repeating pattern... )
+bool detectPSK(){
+ int ans = GetPskClock("", FALSE, FALSE);
+ if (ans <= 0) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - EM: PSK clock failed");
+ return FALSE;
+ }
+ //demod
+ //try psk1 -- 0 0 6 (six errors?!?)
+ ans = PSKDemod("0 0 6", FALSE);
+ if (!ans) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - EM: PSK1 Demod failed");
+
+ //try psk1 inverted
+ ans = PSKDemod("0 1 6", FALSE);
+ if (!ans) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - EM: PSK1 inverted Demod failed");
+ return FALSE;
+ }
+ }
+ // either PSK1 or PSK1 inverted is ok from here.
+ // lets check PSK2 later.
+ return TRUE;
+}
+// try manchester - NOTE: ST only applies to T55x7 tags.
+bool detectASK_MAN(){
+ bool stcheck = FALSE;
+ int ans = ASKDemod_ext("0 0 0", FALSE, FALSE, 1, &stcheck);
+ if (!ans) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - EM: ASK/Manchester Demod failed");
+ return FALSE;
+ }
+ return TRUE;
+}
+bool detectASK_BI(){
+ int ans = ASKbiphaseDemod("0 0 1", FALSE);
+ if (!ans) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - EM: ASK/biphase normal demod failed");
+
+ ans = ASKbiphaseDemod("0 1 1", FALSE);
+ if (!ans) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - EM: ASK/biphase inverted demod failed");
+ return FALSE;
+ }
+ }
+ return TRUE;
+}
+
+// param: idx - start index in demoded data.
+bool setDemodBufferEM(uint32_t *word, size_t idx){
+
+ //test for even parity bits.
+ uint8_t parity[45] = {0};
+ memcpy( parity, DemodBuffer, 45);
+ if (!EMwordparitytest(parity) ){
+ PrintAndLog("DEBUG: Error - EM Parity tests failed");
+ return FALSE;
+ }
+
+ // test for even parity bits and remove them. (leave out the end row of parities so 36 bits)
+ if (!removeParity(DemodBuffer, idx + EM_PREAMBLE_LEN, 9, 0, 36)) {
+ if (g_debugMode) PrintAndLog("DEBUG: Error - EM, failed removing parity");
+ return FALSE;
+ }
+ setDemodBuf(DemodBuffer, 32, 0);
+ *word = bytebits_to_byteLSBF(DemodBuffer, 32);
+ return TRUE;
+}
+
+// FSK, PSK, ASK/MANCHESTER, ASK/BIPHASE, ASK/DIPHASE
+// should cover 90% of known used configs
+// the rest will need to be manually demoded for now...
+bool demodEM4x05resp(uint32_t *word) {
+ size_t idx = 0;
+ *word = 0;
+ if (detectASK_MAN() && doPreambleSearch( &idx ))
+ return setDemodBufferEM(word, idx);
+
+ if (detectASK_BI() && doPreambleSearch( &idx ))
+ return setDemodBufferEM(word, idx);
+
+ if (detectFSK() && doPreambleSearch( &idx ))
+ return setDemodBufferEM(word, idx);
+
+ if (detectPSK()) {
+ if (doPreambleSearch( &idx ))
+ return setDemodBufferEM(word, idx);
+
+ psk1TOpsk2(DemodBuffer, DemodBufferLen);
+ if (doPreambleSearch( &idx ))
+ return setDemodBufferEM(word, idx);
+ }
+ return FALSE;
+}
+
+//////////////// 4205 / 4305 commands
+int usage_lf_em4x05_dump(void) {
+ PrintAndLog("Dump EM4x05/EM4x69. Tag must be on antenna. ");
+ PrintAndLog("");
+ PrintAndLog("Usage: lf em 4x05dump [h] <pwd>");
+ PrintAndLog("Options:");
+ PrintAndLog(" h - this help");
+ PrintAndLog(" pwd - password (hex) (optional)");
+ PrintAndLog("samples:");
+ PrintAndLog(" lf em 4x05dump");
+ PrintAndLog(" lf em 4x05dump 11223344");
+ return 0;
+}
+int usage_lf_em4x05_read(void) {
+ PrintAndLog("Read EM4x05/EM4x69. Tag must be on antenna. ");
+ PrintAndLog("");
+ PrintAndLog("Usage: lf em 4x05read [h] <address> <pwd>");
+ PrintAndLog("Options:");
+ PrintAndLog(" h - this help");
+ PrintAndLog(" address - memory address to read. (0-15)");
+ PrintAndLog(" pwd - password (hex) (optional)");
+ PrintAndLog("samples:");
+ PrintAndLog(" lf em 4x05read 1");
+ PrintAndLog(" lf em 4x05read 1 11223344");
+ return 0;
+}
+int usage_lf_em4x05_write(void) {
+ PrintAndLog("Write EM4x05/4x69. Tag must be on antenna. ");
+ PrintAndLog("");
+ PrintAndLog("Usage: lf em 4x05write [h] <address> <data> <pwd>");
+ PrintAndLog("Options:");
+ PrintAndLog(" h - this help");
+ PrintAndLog(" address - memory address to write to. (0-15)");
+ PrintAndLog(" data - data to write (hex)");
+ PrintAndLog(" pwd - password (hex) (optional)");
+ PrintAndLog("samples:");
+ PrintAndLog(" lf em 4x05write 1 deadc0de");
+ PrintAndLog(" lf em 4x05write 1 deadc0de 11223344");
+ return 0;
+}
+int usage_lf_em4x05_info(void) {
+ PrintAndLog("Tag information EM4205/4305/4469//4569 tags. Tag must be on antenna.");
+ PrintAndLog("");
+ PrintAndLog("Usage: lf em 4x05info [h] <pwd>");
+ PrintAndLog("Options:");
+ PrintAndLog(" h - this help");
+ PrintAndLog(" pwd - password (hex) (optional)");
+ PrintAndLog("samples:");
+ PrintAndLog(" lf em 4x05info");
+ PrintAndLog(" lf em 4x05info deadc0de");
+ return 0;
+}
+
+int EM4x05ReadWord_ext(uint8_t addr, uint32_t pwd, bool usePwd, uint32_t *word) {
+ UsbCommand c = {CMD_EM4X_READ_WORD, {addr, pwd, usePwd}};
+ clearCommandBuffer();
+ SendCommand(&c);
+ UsbCommand resp;
+ if (!WaitForResponseTimeout(CMD_ACK, &resp, 2500)){
+ PrintAndLog("Command timed out");
+ return -1;
+ }
+ if ( !downloadSamplesEM() ) {
+ return -1;
+ }
+ int testLen = (GraphTraceLen < 1000) ? GraphTraceLen : 1000;
+ if (graphJustNoise(GraphBuffer, testLen)) {
+ PrintAndLog("no tag found");
+ return -1;
+ }
+ return demodEM4x05resp(word);
+}
+
+int CmdEM4x05Dump(const char *Cmd) {
+ uint8_t addr = 0;
+ uint32_t pwd = 0;
+ bool usePwd = false;
+ uint8_t ctmp = param_getchar(Cmd, 0);
+ if ( ctmp == 'H' || ctmp == 'h' ) return usage_lf_em4x05_dump();
+
+ // for now use default input of 1 as invalid (unlikely 1 will be a valid password...)
+ pwd = param_get32ex(Cmd, 0, 1, 16);
+
+ if ( pwd != 1 )
+ usePwd = true;
+
+ int success = 1;
+ uint32_t word = 0;
+ PrintAndLog("Addr | data | ascii");
+ PrintAndLog("-----+--------+------");
+ for (; addr < 16; addr++) {
+
+ if (addr == 2) {
+ if (usePwd) {
+ PrintAndLog(" %02u | %08X", addr, pwd, word );
+ } else {
+ PrintAndLog(" 02 | cannot read");
+ }
+ } else {
+ success &= EM4x05ReadWord_ext(addr, pwd, usePwd, &word);
+ }
+ }
+
+ return success;
+}
+
+int CmdEM4x05Read(const char *Cmd) {
+ uint8_t addr;
+ uint32_t pwd;
+ bool usePwd = false;
+ uint8_t ctmp = param_getchar(Cmd, 0);
+ if ( strlen(Cmd) == 0 || ctmp == 'H' || ctmp == 'h' ) return usage_lf_em4x05_read();
+
+ addr = param_get8ex(Cmd, 0, 50, 10);
+ pwd = param_get32ex(Cmd, 1, 1, 16);
+
+ if (addr > 15) {
+ PrintAndLog("Address must be between 0 and 15");
projects / proxmark3-svn / blobdiff