X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/c15d2bdc9b25da89931c767902639fa7e8c9b764..c528cf39896943c2c3738c7b8a54e9be153eb2ca:/client/cmdlfem4x.c diff --git a/client/cmdlfem4x.c b/client/cmdlfem4x.c index 07f909ac..d139724c 100644 --- a/client/cmdlfem4x.c +++ b/client/cmdlfem4x.c @@ -1,4 +1,4 @@ - //----------------------------------------------------------------------------- +//----------------------------------------------------------------------------- // Copyright (C) 2010 iZsh // // This code is licensed to you under the terms of the GNU GPL, version 2 or, @@ -11,23 +11,22 @@ #include #include #include -#include "proxmark3.h" -#include "ui.h" -#include "graph.h" -#include "cmdmain.h" -#include "cmdparser.h" -#include "cmddata.h" -#include "cmdlf.h" #include "cmdlfem4x.h" -#include "util.h" -#include "data.h" -#define LF_TRACE_BUFF_SIZE 12000 -#define LF_BITSSTREAM_LEN 1000 -char *global_em410xId; +uint64_t g_em410xid = 0; static int CmdHelp(const char *Cmd); +int CmdEMdemodASK(const char *Cmd) +{ + char cmdp = param_getchar(Cmd, 0); + int findone = (cmdp == '1') ? 1 : 0; + UsbCommand c={CMD_EM410X_DEMOD}; + c.arg[0]=findone; + SendCommand(&c); + return 0; +} + /* Read the ID of an EM410x tag. * Format: * 1111 1111 1 <-- standard non-repeatable header @@ -38,240 +37,88 @@ static int CmdHelp(const char *Cmd); */ int CmdEM410xRead(const char *Cmd) { - int i, j, clock, header, rows, bit, hithigh, hitlow, first, bit2idx, high, low; - int parity[4]; - char id[11]; - char id2[11]; - int retested = 0; - uint8_t BitStream[MAX_GRAPH_TRACE_LEN]; - high = low = 0; - - /* Detect high and lows and clock */ - for (i = 0; i < GraphTraceLen; i++) - { - if (GraphBuffer[i] > high) - high = GraphBuffer[i]; - else if (GraphBuffer[i] < low) - low = GraphBuffer[i]; - } - - /* get clock */ - clock = GetClock(Cmd, high, 0); - - /* parity for our 4 columns */ - parity[0] = parity[1] = parity[2] = parity[3] = 0; - header = rows = 0; - - /* manchester demodulate */ - bit = bit2idx = 0; - for (i = 0; i < (int)(GraphTraceLen / clock); i++) - { - hithigh = 0; - hitlow = 0; - first = 1; - - /* Find out if we hit both high and low peaks */ - for (j = 0; j < clock; j++) - { - if (GraphBuffer[(i * clock) + j] == high) - hithigh = 1; - else if (GraphBuffer[(i * clock) + j] == low) - hitlow = 1; - - /* it doesn't count if it's the first part of our read - because it's really just trailing from the last sequence */ - if (first && (hithigh || hitlow)) - hithigh = hitlow = 0; - else - first = 0; - - if (hithigh && hitlow) - break; - } - - /* If we didn't hit both high and low peaks, we had a bit transition */ - if (!hithigh || !hitlow) - bit ^= 1; - - BitStream[bit2idx++] = bit; - } - -retest: - /* We go till 5 before the graph ends because we'll get that far below */ - for (i = 0; i < bit2idx - 5; i++) - { - /* Step 2: We have our header but need our tag ID */ - if (header == 9 && rows < 10) - { - /* Confirm parity is correct */ - if ((BitStream[i] ^ BitStream[i+1] ^ BitStream[i+2] ^ BitStream[i+3]) == BitStream[i+4]) - { - /* Read another byte! */ - sprintf(id+rows, "%x", (8 * BitStream[i]) + (4 * BitStream[i+1]) + (2 * BitStream[i+2]) + (1 * BitStream[i+3])); - sprintf(id2+rows, "%x", (8 * BitStream[i+3]) + (4 * BitStream[i+2]) + (2 * BitStream[i+1]) + (1 * BitStream[i])); - rows++; - - /* Keep parity info */ - parity[0] ^= BitStream[i]; - parity[1] ^= BitStream[i+1]; - parity[2] ^= BitStream[i+2]; - parity[3] ^= BitStream[i+3]; - - /* Move 4 bits ahead */ - i += 4; - } - - /* Damn, something wrong! reset */ - else - { - PrintAndLog("Thought we had a valid tag but failed at word %d (i=%d)", rows + 1, i); - - /* Start back rows * 5 + 9 header bits, -1 to not start at same place */ - i -= 9 + (5 * rows) -5; - - rows = header = 0; - } - } - - /* Step 3: Got our 40 bits! confirm column parity */ - else if (rows == 10) - { - /* We need to make sure our 4 bits of parity are correct and we have a stop bit */ - if (BitStream[i] == parity[0] && BitStream[i+1] == parity[1] && - BitStream[i+2] == parity[2] && BitStream[i+3] == parity[3] && - BitStream[i+4] == 0) - { - /* Sweet! */ - PrintAndLog("EM410x Tag ID: %s", id); - PrintAndLog("Unique Tag ID: %s", id2); - - global_em410xId = id; - - /* Stop any loops */ - return 1; - } - - /* Crap! Incorrect parity or no stop bit, start all over */ - else - { - rows = header = 0; - - /* Go back 59 bits (9 header bits + 10 rows at 4+1 parity) */ - i -= 59; - } - } - - /* Step 1: get our header */ - else if (header < 9) - { - /* Need 9 consecutive 1's */ - if (BitStream[i] == 1) - header++; - - /* We don't have a header, not enough consecutive 1 bits */ - else - header = 0; - } - } - - /* if we've already retested after flipping bits, return */ - if (retested++){ - return 0; + uint32_t hi=0; + uint64_t lo=0; + + if(!AskEm410xDemod("", &hi, &lo, false)) return 0; + PrintAndLog("EM410x pattern found: "); + printEM410x(hi, lo); + if (hi){ + PrintAndLog ("EM410x XL pattern found"); + return 0; } - - /* if this didn't work, try flipping bits */ - for (i = 0; i < bit2idx; i++) - BitStream[i] ^= 1; - - goto retest; + g_em410xid = lo; + return 1; } -/* emulate an EM410X tag - * Format: - * 1111 1111 1 <-- standard non-repeatable header - * XXXX [row parity bit] <-- 10 rows of 5 bits for our 40 bit tag ID - * .... - * CCCC <-- each bit here is parity for the 10 bits above in corresponding column - * 0 <-- stop bit, end of tag - */ +// emulate an EM410X tag int CmdEM410xSim(const char *Cmd) -{ - int i, n, j, h, binary[4], parity[4]; - - char cmdp = param_getchar(Cmd, 0); +{ + int i, n, j, binary[4], parity[4]; uint8_t uid[5] = {0x00}; + char cmdp = param_getchar(Cmd, 0); if (cmdp == 'h' || cmdp == 'H') { - PrintAndLog("Usage: lf em4x sim "); + PrintAndLog("Usage: lf em4x em410xsim "); PrintAndLog(""); - PrintAndLog(" sample: lf em4x sim 0F0368568B"); + PrintAndLog(" sample: lf em4x em410xsim 0F0368568B"); return 0; } + /* clock is 64 in EM410x tags */ + uint8_t clock = 64; if (param_gethex(Cmd, 0, uid, 10)) { PrintAndLog("UID must include 10 HEX symbols"); return 0; } + param_getdec(Cmd, 1, &clock); - PrintAndLog("Starting simulating UID %02X%02X%02X%02X%02X", uid[0],uid[1],uid[2],uid[3],uid[4]); + PrintAndLog("Starting simulating UID %02X%02X%02X%02X%02X clock: %d", uid[0],uid[1],uid[2],uid[3],uid[4],clock); PrintAndLog("Press pm3-button to about simulation"); - - /* clock is 64 in EM410x tags */ - int clock = 64; - - /* clear our graph */ - ClearGraph(0); - - /* write it out a few times */ - //for (h = 0; h < 4; h++) - //{ - /* write 9 start bits */ - for (i = 0; i < 9; i++) - AppendGraph(0, clock, 1); - - /* for each hex char */ - parity[0] = parity[1] = parity[2] = parity[3] = 0; - for (i = 0; i < 10; i++) - { - /* read each hex char */ - sscanf(&Cmd[i], "%1x", &n); - for (j = 3; j >= 0; j--, n/= 2) - binary[j] = n % 2; - - /* append each bit */ - AppendGraph(0, clock, binary[0]); - AppendGraph(0, clock, binary[1]); - AppendGraph(0, clock, binary[2]); - AppendGraph(0, clock, binary[3]); - - /* append parity bit */ - AppendGraph(0, clock, binary[0] ^ binary[1] ^ binary[2] ^ binary[3]); - - /* keep track of column parity */ - parity[0] ^= binary[0]; - parity[1] ^= binary[1]; - parity[2] ^= binary[2]; - parity[3] ^= binary[3]; - } - - /* parity columns */ - AppendGraph(0, clock, parity[0]); - AppendGraph(0, clock, parity[1]); - AppendGraph(0, clock, parity[2]); - AppendGraph(0, clock, parity[3]); - - /* stop bit */ - AppendGraph(0, clock, 0); - //} - - /* modulate that biatch */ - //CmdManchesterMod("64"); - - /* booyah! */ - RepaintGraphWindow(); - - CmdLFSim(""); - return 0; + + /* clear our graph */ + ClearGraph(0); + + /* write 9 start bits */ + for (i = 0; i < 9; i++) + AppendGraph(0, clock, 1); + + /* for each hex char */ + parity[0] = parity[1] = parity[2] = parity[3] = 0; + for (i = 0; i < 10; i++) + { + /* read each hex char */ + sscanf(&Cmd[i], "%1x", &n); + for (j = 3; j >= 0; j--, n/= 2) + binary[j] = n % 2; + + /* append each bit */ + AppendGraph(0, clock, binary[0]); + AppendGraph(0, clock, binary[1]); + AppendGraph(0, clock, binary[2]); + AppendGraph(0, clock, binary[3]); + + /* append parity bit */ + AppendGraph(0, clock, binary[0] ^ binary[1] ^ binary[2] ^ binary[3]); + + /* keep track of column parity */ + parity[0] ^= binary[0]; + parity[1] ^= binary[1]; + parity[2] ^= binary[2]; + parity[3] ^= binary[3]; + } + + /* parity columns */ + AppendGraph(0, clock, parity[0]); + AppendGraph(0, clock, parity[1]); + AppendGraph(0, clock, parity[2]); + AppendGraph(0, clock, parity[3]); + + /* stop bit */ + AppendGraph(1, clock, 0); + + CmdLFSim("0"); //240 start_gap. + return 0; } /* Function is equivalent of lf read + data samples + em410xread @@ -282,184 +129,43 @@ int CmdEM410xSim(const char *Cmd) * rate gets lower, then grow the number of samples * Changed by martin, 4000 x 4 = 16000, * see http://www.proxmark.org/forum/viewtopic.php?pid=7235#p7235 - */ int CmdEM410xWatch(const char *Cmd) { - int read_h = (*Cmd == 'h'); - do - { + do { if (ukbhit()) { printf("\naborted via keyboard!\n"); break; } - CmdLFRead(read_h ? "h" : ""); - CmdSamples("6000"); - - } while ( - !CmdEM410xRead("") - ); + CmdLFRead("s"); + getSamples("8201",true); //capture enough to get 2 complete preambles (4096*2+9) + } while (!CmdEM410xRead("")); + return 0; } +//currently only supports manchester modulations +// todo: helptext int CmdEM410xWatchnSpoof(const char *Cmd) { - CmdEM410xWatch(Cmd); - PrintAndLog("# Replaying : %s",global_em410xId); - CmdEM410xSim(global_em410xId); - return 0; -} - -/* Read the transmitted data of an EM4x50 tag - * Format: - * - * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity - * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity - * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity - * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity - * CCCCCCCC <- column parity bits - * 0 <- stop bit - * LW <- Listen Window - * - * This pattern repeats for every block of data being transmitted. - * Transmission starts with two Listen Windows (LW - a modulated - * pattern of 320 cycles each (32/32/128/64/64)). - * - * Note that this data may or may not be the UID. It is whatever data - * is stored in the blocks defined in the control word First and Last - * Word Read values. UID is stored in block 32. - */ -int CmdEM4x50Read(const char *Cmd) -{ - int i, j, startblock, skip, block, start, end, low, high; - bool complete= false; - int tmpbuff[MAX_GRAPH_TRACE_LEN / 64]; - char tmp[6]; - - high= low= 0; - memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64); - - /* first get high and low values */ - for (i = 0; i < GraphTraceLen; i++) - { - if (GraphBuffer[i] > high) - high = GraphBuffer[i]; - else if (GraphBuffer[i] < low) - low = GraphBuffer[i]; - } - - /* populate a buffer with pulse lengths */ - i= 0; - j= 0; - while (i < GraphTraceLen) - { - // measure from low to low - while ((GraphBuffer[i] > low) && (i low) && (i=(MAX_GRAPH_TRACE_LEN/64)) { - break; - } - tmpbuff[j++]= i - start; - } - - /* look for data start - should be 2 pairs of LW (pulses of 192,128) */ - start= -1; - skip= 0; - for (i= 0; i < j - 4 ; ++i) - { - skip += tmpbuff[i]; - if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194) - if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130) - if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194) - if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130) - { - start= i + 3; - break; - } - } - startblock= i + 3; - - /* skip over the remainder of the LW */ - skip += tmpbuff[i+1]+tmpbuff[i+2]; - while (skip < MAX_GRAPH_TRACE_LEN && GraphBuffer[skip] > low) - ++skip; - skip += 8; - - /* now do it again to find the end */ - end= start; - for (i += 3; i < j - 4 ; ++i) - { - end += tmpbuff[i]; - if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194) - if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130) - if (tmpbuff[i+2] >= 190 && tmpbuff[i+2] <= 194) - if (tmpbuff[i+3] >= 126 && tmpbuff[i+3] <= 130) - { - complete= true; - break; - } - } - - if (start >= 0) - PrintAndLog("Found data at sample: %i",skip); - else - { - PrintAndLog("No data found!"); - PrintAndLog("Try again with more samples."); - return 0; - } - - if (!complete) - { - PrintAndLog("*** Warning!"); - PrintAndLog("Partial data - no end found!"); - PrintAndLog("Try again with more samples."); - } - - /* get rid of leading crap */ - sprintf(tmp,"%i",skip); - CmdLtrim(tmp); - - /* now work through remaining buffer printing out data blocks */ - block= 0; - i= startblock; - while (block < 6) - { - PrintAndLog("Block %i:", block); - // mandemod routine needs to be split so we can call it for data - // just print for now for debugging - CmdManchesterDemod("i 64"); - skip= 0; - /* look for LW before start of next block */ - for ( ; i < j - 4 ; ++i) - { - skip += tmpbuff[i]; - if (tmpbuff[i] >= 190 && tmpbuff[i] <= 194) - if (tmpbuff[i+1] >= 126 && tmpbuff[i+1] <= 130) - break; - } - while (GraphBuffer[skip] > low) - ++skip; - skip += 8; - sprintf(tmp,"%i",skip); - CmdLtrim(tmp); - start += skip; - block++; - } - return 0; + // loops if the captured ID was in XL-format. + uint8_t ans = 0; + do { + ans = CmdEM410xWatch(Cmd); + if ( ans ) { + PrintAndLog("# Replaying captured ID: %llu", g_em410xid); + CmdLFaskSim(""); + } + } while ( !ans ); + return 0; } int CmdEM410xWrite(const char *Cmd) { - uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value - int card = 0xFF; // invalid card value - unsigned int clock = 0; // invalid clock value + uint64_t id = 0xFFFFFFFFFFFFFFFF; // invalid id value + int card = 0xFF; // invalid card value + uint32_t clock = 0; // invalid clock value sscanf(Cmd, "%" PRIx64 " %d %d", &id, &card, &clock); @@ -484,21 +190,13 @@ int CmdEM410xWrite(const char *Cmd) } // Check Clock - if (card == 1) - { // Default: 64 - if (clock == 0) - clock = 64; + if (clock == 0) + clock = 64; - // Allowed clock rates: 16, 32 and 64 - if ((clock != 16) && (clock != 32) && (clock != 64)) { - PrintAndLog("Error! Clock rate %d not valid. Supported clock rates are 16, 32 and 64.\n", clock); - return 0; - } - } - else if (clock != 0) - { - PrintAndLog("Error! Clock rate is only supported on T55x7 tags.\n"); + // Allowed clock rates: 16, 32, 40 and 64 + if ((clock != 16) && (clock != 32) && (clock != 64) && (clock != 40)) { + PrintAndLog("Error! Clock rate %d not valid. Supported clock rates are 16, 32, 40 and 64.\n", clock); return 0; } @@ -508,58 +206,312 @@ int CmdEM410xWrite(const char *Cmd) // provide for backwards-compatibility for older firmware, and to avoid // having to add another argument to CMD_EM410X_WRITE_TAG, we just store // the clock rate in bits 8-15 of the card value - card = (card & 0xFF) | (((uint64_t)clock << 8) & 0xFF00); - } - else if (card == 0) + card = (card & 0xFF) | ((clock << 8) & 0xFF00); + } else if (card == 0) { PrintAndLog("Writing %s tag with UID 0x%010" PRIx64, "T5555", id, clock); - else { + card = (card & 0xFF) | ((clock << 8) & 0xFF00); + } else { PrintAndLog("Error! Bad card type selected.\n"); return 0; } - UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}}; - SendCommand(&c); + UsbCommand c = {CMD_EM410X_WRITE_TAG, {card, (uint32_t)(id >> 32), (uint32_t)id}}; + SendCommand(&c); + return 0; +} + +bool EM_EndParityTest(uint8_t *BitStream, size_t size, uint8_t rows, uint8_t cols, uint8_t pType) +{ + if (rows*cols>size) return false; + uint8_t colP=0; + //assume last col is a parity and do not test + for (uint8_t colNum = 0; colNum < cols-1; colNum++) { + for (uint8_t rowNum = 0; rowNum < rows; rowNum++) { + colP ^= BitStream[(rowNum*cols)+colNum]; + } + if (colP != pType) return false; + } + return true; +} + +bool EM_ByteParityTest(uint8_t *BitStream, size_t size, uint8_t rows, uint8_t cols, uint8_t pType) +{ + if (rows*cols>size) return false; + uint8_t rowP=0; + //assume last row is a parity row and do not test + for (uint8_t rowNum = 0; rowNum < rows-1; rowNum++) { + for (uint8_t colNum = 0; colNum < cols; colNum++) { + rowP ^= BitStream[(rowNum*cols)+colNum]; + } + if (rowP != pType) return false; + } + return true; +} + +uint32_t OutputEM4x50_Block(uint8_t *BitStream, size_t size, bool verbose, bool pTest) +{ + if (size<45) return 0; + uint32_t code = bytebits_to_byte(BitStream,8); + code = code<<8 | bytebits_to_byte(BitStream+9,8); + code = code<<8 | bytebits_to_byte(BitStream+18,8); + code = code<<8 | bytebits_to_byte(BitStream+27,8); + if (verbose || g_debugMode){ + for (uint8_t i = 0; i<5; i++){ + if (i == 4) PrintAndLog(""); //parity byte spacer + PrintAndLog("%d%d%d%d%d%d%d%d %d -> 0x%02x", + BitStream[i*9], + BitStream[i*9+1], + BitStream[i*9+2], + BitStream[i*9+3], + BitStream[i*9+4], + BitStream[i*9+5], + BitStream[i*9+6], + BitStream[i*9+7], + BitStream[i*9+8], + bytebits_to_byte(BitStream+i*9,8) + ); + } + if (pTest) + PrintAndLog("Parity Passed"); + else + PrintAndLog("Parity Failed"); + } + return code; +} +/* Read the transmitted data of an EM4x50 tag + * Format: + * + * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity + * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity + * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity + * XXXXXXXX [row parity bit (even)] <- 8 bits plus parity + * CCCCCCCC <- column parity bits + * 0 <- stop bit + * LW <- Listen Window + * + * This pattern repeats for every block of data being transmitted. + * Transmission starts with two Listen Windows (LW - a modulated + * pattern of 320 cycles each (32/32/128/64/64)). + * + * Note that this data may or may not be the UID. It is whatever data + * is stored in the blocks defined in the control word First and Last + * Word Read values. UID is stored in block 32. + */ + //completed by Marshmellow +int EM4x50Read(const char *Cmd, bool verbose) +{ + uint8_t fndClk[] = {8,16,32,40,50,64,128}; + int clk = 0; + int invert = 0; + int tol = 0; + int i, j, startblock, skip, block, start, end, low, high, minClk; + bool complete = false; + int tmpbuff[MAX_GRAPH_TRACE_LEN / 64]; + uint32_t Code[6]; + char tmp[6]; + char tmp2[20]; + int phaseoff; + high = low = 0; + memset(tmpbuff, 0, MAX_GRAPH_TRACE_LEN / 64); + + // get user entry if any + sscanf(Cmd, "%i %i", &clk, &invert); + + // save GraphBuffer - to restore it later + save_restoreGB(1); + + // first get high and low values + for (i = 0; i < GraphTraceLen; i++) { + if (GraphBuffer[i] > high) + high = GraphBuffer[i]; + else if (GraphBuffer[i] < low) + low = GraphBuffer[i]; + } + + 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) 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'"); + } + } - return 0; + //restore GraphBuffer + save_restoreGB(0); + return (int)AllPTest; +} + +int CmdEM4x50Read(const char *Cmd) +{ + return EM4x50Read(Cmd, true); } int CmdReadWord(const char *Cmd) { int Word = -1; //default to invalid word UsbCommand c; - + sscanf(Cmd, "%d", &Word); - + if ( (Word > 15) | (Word < 0) ) { PrintAndLog("Word must be between 0 and 15"); return 1; } - + PrintAndLog("Reading word %d", Word); - + c.cmd = CMD_EM4X_READ_WORD; c.d.asBytes[0] = 0x0; //Normal mode c.arg[0] = 0; c.arg[1] = Word; c.arg[2] = 0; SendCommand(&c); - WaitForResponse(CMD_ACK, NULL); - - uint8_t data[LF_TRACE_BUFF_SIZE] = {0x00}; - - GetFromBigBuf(data,LF_TRACE_BUFF_SIZE,3560); //3560 -- should be offset.. - WaitForResponseTimeout(CMD_ACK,NULL, 1500); - - for (int j = 0; j < LF_TRACE_BUFF_SIZE; j++) { - GraphBuffer[j] = ((int)data[j]); - } - GraphTraceLen = LF_TRACE_BUFF_SIZE; - - uint8_t bits[LF_BITSSTREAM_LEN] = {0x00}; - uint8_t * bitstream = bits; - manchester_decode(GraphBuffer, LF_TRACE_BUFF_SIZE, bitstream,LF_BITSSTREAM_LEN); - RepaintGraphWindow(); - return 0; + return 0; } int CmdReadWordPWD(const char *Cmd) @@ -567,375 +519,98 @@ int CmdReadWordPWD(const char *Cmd) int Word = -1; //default to invalid word int Password = 0xFFFFFFFF; //default to blank password UsbCommand c; - + sscanf(Cmd, "%d %x", &Word, &Password); - + if ( (Word > 15) | (Word < 0) ) { PrintAndLog("Word must be between 0 and 15"); return 1; } - + PrintAndLog("Reading word %d with password %08X", Word, Password); - + c.cmd = CMD_EM4X_READ_WORD; c.d.asBytes[0] = 0x1; //Password mode c.arg[0] = 0; c.arg[1] = Word; c.arg[2] = Password; SendCommand(&c); - WaitForResponse(CMD_ACK, NULL); - - uint8_t data[LF_TRACE_BUFF_SIZE] = {0x00}; - - GetFromBigBuf(data,LF_TRACE_BUFF_SIZE,3560); //3560 -- should be offset.. - WaitForResponseTimeout(CMD_ACK,NULL, 1500); - - for (int j = 0; j < LF_TRACE_BUFF_SIZE; j++) { - GraphBuffer[j] = ((int)data[j]); - } - GraphTraceLen = LF_TRACE_BUFF_SIZE; - - uint8_t bits[LF_BITSSTREAM_LEN] = {0x00}; - uint8_t * bitstream = bits; - manchester_decode(GraphBuffer, LF_TRACE_BUFF_SIZE, bitstream, LF_BITSSTREAM_LEN); - RepaintGraphWindow(); - return 0; + return 0; } int CmdWriteWord(const char *Cmd) { - int Word = 16; //default to invalid block - int Data = 0xFFFFFFFF; //default to blank data - UsbCommand c; - - sscanf(Cmd, "%x %d", &Data, &Word); - - if (Word > 15) { - PrintAndLog("Word must be between 0 and 15"); - return 1; - } - - PrintAndLog("Writing word %d with data %08X", Word, Data); - - c.cmd = CMD_EM4X_WRITE_WORD; - c.d.asBytes[0] = 0x0; //Normal mode - c.arg[0] = Data; - c.arg[1] = Word; - c.arg[2] = 0; - SendCommand(&c); - return 0; -} - -int CmdWriteWordPWD(const char *Cmd) -{ - int Word = 16; //default to invalid word - int Data = 0xFFFFFFFF; //default to blank data - int Password = 0xFFFFFFFF; //default to blank password - UsbCommand c; - - sscanf(Cmd, "%x %d %x", &Data, &Word, &Password); - - if (Word > 15) { - PrintAndLog("Word must be between 0 and 15"); - return 1; - } - - PrintAndLog("Writing word %d with data %08X and password %08X", Word, Data, Password); - - c.cmd = CMD_EM4X_WRITE_WORD; - c.d.asBytes[0] = 0x1; //Password mode - c.arg[0] = Data; - c.arg[1] = Word; - c.arg[2] = Password; - SendCommand(&c); - return 0; -} - -static command_t CommandTable[] = -{ - {"help", CmdHelp, 1, "This help"}, - - {"410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag"}, - {"410xsim", CmdEM410xSim, 0, " -- Simulate EM410x tag"}, - {"replay", MWRem4xReplay, 0, "Watches for tag and simulates manchester encoded em4x tag"}, - {"410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"}, - {"410xspoof", CmdEM410xWatchnSpoof, 0, "['h'] --- Watches for EM410x 125/134 kHz tags, and replays them. (option 'h' for 134)" }, - {"410xwrite", CmdEM410xWrite, 1, " <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"}, - {"4x50read", CmdEM4x50Read, 1, "Extract data from EM4x50 tag"}, - {"rd", CmdReadWord, 1, " -- Read EM4xxx word data"}, - {"rdpwd", CmdReadWordPWD, 1, " -- Read EM4xxx word data in password mode "}, - {"wr", CmdWriteWord, 1, " -- Write EM4xxx word data"}, - {"wrpwd", CmdWriteWordPWD, 1, " -- Write EM4xxx word data in password mode"}, - {NULL, NULL, 0, NULL} -}; - - -//Confirms the parity of a bitstream as well as obtaining the data (TagID) from within the appropriate memory space. -//Arguments: -// Pointer to a string containing the desired bitsream -// Pointer to a string that will receive the decoded tag ID -// Length of the bitsream pointed at in the first argument, char* _strBitStream -//Retuns: -//1 Parity confirmed -//0 Parity not confirmed -int ConfirmEm410xTagParity( char* _strBitStream, char* pID, int LengthOfBitstream ) -{ - int i = 0; - int rows = 0; - int Parity[4] = {0x00}; - char ID[11] = {0x00}; - int k = 0; - int BitStream[70] = {0x00}; - int counter = 0; - //prepare variables - for ( i = 0; i <= LengthOfBitstream; i++) - { - if (_strBitStream[i] == '1') - { - k =1; - memcpy(&BitStream[i], &k,4); - } - else if (_strBitStream[i] == '0') - { - k = 0; - memcpy(&BitStream[i], &k,4); - } - } - while ( counter < 2 ) - { - //set/reset variables and counters - memset(ID,0x00,sizeof(ID)); - memset(Parity,0x00,sizeof(Parity)); - rows = 0; - for ( i = 9; i <= LengthOfBitstream; i++) - { - if ( rows < 10 ) - { - if ((BitStream[i] ^ BitStream[i+1] ^ BitStream[i+2] ^ BitStream[i+3]) == BitStream[i+4]) - { - sprintf(ID+rows, "%x", (8 * BitStream[i]) + (4 * BitStream[i+1]) + (2 * BitStream[i+2]) + (1 * BitStream[i+3])); - rows++; - /* Keep parity info and move four bits ahead*/ - Parity[0] ^= BitStream[i]; - Parity[1] ^= BitStream[i+1]; - Parity[2] ^= BitStream[i+2]; - Parity[3] ^= BitStream[i+3]; - i += 4; - } - } - if ( rows == 10 ) - { - if ( BitStream[i] == Parity[0] && BitStream[i+1] == Parity[1] && - BitStream[i+2] == Parity[2] && BitStream[i+3] == Parity[3] && - BitStream[i+4] == 0) - { - memcpy(pID,ID,strlen(ID)); - return 1; - } - } - } - printf("[PARITY ->]Failed. Flipping Bits, and rechecking parity for bitstream:\n[PARITY ->]"); - for (k = 0; k < LengthOfBitstream; k++) - { - BitStream[k] ^= 1; - printf("%i", BitStream[k]); - } - puts(" "); - counter++; + int Word = 16; //default to invalid block + int Data = 0xFFFFFFFF; //default to blank data + UsbCommand c; + + sscanf(Cmd, "%x %d", &Data, &Word); + + if (Word > 15) { + PrintAndLog("Word must be between 0 and 15"); + return 1; } + + PrintAndLog("Writing word %d with data %08X", Word, Data); + + c.cmd = CMD_EM4X_WRITE_WORD; + c.d.asBytes[0] = 0x0; //Normal mode + c.arg[0] = Data; + c.arg[1] = Word; + c.arg[2] = 0; + SendCommand(&c); return 0; } -//Reads and demodulates an em410x RFID tag. It further allows slight modification to the decoded bitstream -//Once a suitable bitstream has been identified, and if needed, modified, it is replayed. Allowing emulation of the -//"stolen" rfid tag. -//No meaningful returns or arguments. -int MWRem4xReplay(const char* Cmd) -{ - // //header traces - // static char ArrayTraceZero[] = { '0','0','0','0','0','0','0','0','0' }; - // static char ArrayTraceOne[] = { '1','1','1','1','1','1','1','1','1' }; - // //local string variables - // char strClockRate[10] = {0x00}; - // char strAnswer[4] = {0x00}; - // char strTempBufferMini[2] = {0x00}; - // //our outbound bit-stream - // char strSimulateBitStream[65] = {0x00}; - // //integers - // int iClockRate = 0; - // int needle = 0; - // int j = 0; - // int iFirstHeaderOffset = 0x00000000; - // int numManchesterDemodBits=0; - // //boolean values - // bool bInverted = false; - // //pointers to strings. memory will be allocated. - // char* pstrInvertBitStream = 0x00000000; - // char* pTempBuffer = 0x00000000; - // char* pID = 0x00000000; - // char* strBitStreamBuffer = 0x00000000; - - // puts("###################################"); - // puts("#### Em4x Replay ##"); - // puts("#### R.A.M. June 2013 ##"); - // puts("###################################"); - // //initialize - // CmdLFRead(""); - // //Collect ourselves 10,000 samples - // CmdSamples("10000"); - // puts("[->]preforming ASK demodulation\n"); - // //demodulate ask - // Cmdaskdemod("0"); - // iClockRate = DetectClock(0); - // sprintf(strClockRate, "%i\n",iClockRate); - // printf("[->]Detected ClockRate: %s\n", strClockRate); +int CmdWriteWordPWD(const char *Cmd) +{ + int Word = 16; //default to invalid word + int Data = 0xFFFFFFFF; //default to blank data + int Password = 0xFFFFFFFF; //default to blank password + UsbCommand c; - // //If detected clock rate is something completely unreasonable, dont go ahead - // if ( iClockRate < 0xFFFE ) - // { - // pTempBuffer = (char*)malloc(MAX_GRAPH_TRACE_LEN); - // if (pTempBuffer == 0x00000000) - // return 0; - // memset(pTempBuffer,0x00,MAX_GRAPH_TRACE_LEN); - // //Preform manchester de-modulation and display in a single line. - // numManchesterDemodBits = CmdManchesterDemod( strClockRate ); - // //note: numManchesterDemodBits is set above in CmdManchesterDemod() - // if ( numManchesterDemodBits == 0 ) - // return 0; - // strBitStreamBuffer = malloc(numManchesterDemodBits+1); - // if ( strBitStreamBuffer == 0x00000000 ) - // return 0; - // memset(strBitStreamBuffer, 0x00, (numManchesterDemodBits+1)); - // //fill strBitStreamBuffer with demodulated, string formatted bits. - // for ( j = 0; j <= numManchesterDemodBits; j++ ) - // { - // sprintf(strTempBufferMini, "%i",BitStream[j]); - // strcat(strBitStreamBuffer,strTempBufferMini); - // } - // printf("[->]Demodulated Bitstream: \n%s\n", strBitStreamBuffer); - // //Reset counter and select most probable bit stream - // j = 0; - // while ( j < numManchesterDemodBits ) - // { - // memset(strSimulateBitStream,0x00,64); - // //search for header of nine (9) 0's : 000000000 or nine (9) 1's : 1111 1111 1 - // if ( ( strncmp(strBitStreamBuffer+j, ArrayTraceZero, sizeof(ArrayTraceZero)) == 0 ) || - // ( strncmp(strBitStreamBuffer+j, ArrayTraceOne, sizeof(ArrayTraceOne)) == 0 ) ) - // { - // iFirstHeaderOffset = j; - // memcpy(strSimulateBitStream, strBitStreamBuffer+j,64); - // printf("[->]Offset of Header"); - // if ( strncmp(strBitStreamBuffer+iFirstHeaderOffset, "0", 1) == 0 ) - // printf("'%s'", ArrayTraceZero ); - // else - // printf("'%s'", ArrayTraceOne ); - // printf(": %i\nHighlighted string : %s\n",iFirstHeaderOffset,strSimulateBitStream); - // //allow us to escape loop or choose another frame - // puts("[<-]Are we happy with this sample? [Y]es/[N]o"); - // gets(strAnswer); - // if ( ( strncmp(strAnswer,"y",1) == 0 ) || ( strncmp(strAnswer,"Y",1) == 0 ) ) - // { - // j = numManchesterDemodBits+1; - // break; - // } - // } - // j++; - // } - // } - // else return 0; + sscanf(Cmd, "%x %d %x", &Data, &Word, &Password); - // //Do we want the buffer inverted? - // memset(strAnswer, 0x00, sizeof(strAnswer)); - // printf("[<-]Do you wish to invert the highlighted bitstream? [Y]es/[N]o\n"); - // gets(strAnswer); - // if ( ( strncmp("y", strAnswer,1) == 0 ) || ( strncmp("Y", strAnswer, 1 ) == 0 ) ) - // { - // //allocate heap memory - // pstrInvertBitStream = (char*)malloc(numManchesterDemodBits); - // if ( pstrInvertBitStream != 0x00000000 ) - // { - // memset(pstrInvertBitStream,0x00,numManchesterDemodBits); - // bInverted = true; - // //Invert Bitstream - // for ( needle = 0; needle <= numManchesterDemodBits; needle++ ) - // { - // if (strSimulateBitStream[needle] == '0') - // strcat(pstrInvertBitStream,"1"); - // else if (strSimulateBitStream[needle] == '1') - // strcat(pstrInvertBitStream,"0"); - // } - // printf("[->]Inverted bitstream: %s\n", pstrInvertBitStream); - // } - // } - // //Confirm parity of selected string - // pID = (char*)malloc(11); - // if (pID != 0x00000000) - // { - // memset(pID, 0x00, 11); - // if (ConfirmEm410xTagParity(strSimulateBitStream,pID, 64) == 1) - // { - // printf("[->]Parity confirmed for selected bitstream!\n"); - // printf("[->]Tag ID was detected as: [hex]:%s\n",pID ); - // } - // else - // printf("[->]Parity check failed for the selected bitstream!\n"); - // } + if (Word > 15) { + PrintAndLog("Word must be between 0 and 15"); + return 1; + } - // //Spoof - // memset(strAnswer, 0x00, sizeof(strAnswer)); - // printf("[<-]Do you wish to continue with the EM4x simulation? [Y]es/[N]o\n"); - // gets(strAnswer); - // if ( ( strncmp(strAnswer,"y",1) == 0 ) || ( strncmp(strAnswer,"Y",1) == 0 ) ) - // { - // strcat(pTempBuffer, strClockRate); - // strcat(pTempBuffer, " "); - // if (bInverted == true) - // strcat(pTempBuffer,pstrInvertBitStream); - // if (bInverted == false) - // strcat(pTempBuffer,strSimulateBitStream); - // //inform the user - // puts("[->]Starting simulation now: \n"); - // //Simulate tag with prepared buffer. - // CmdLFSimManchester(pTempBuffer); - // } - // else if ( ( strcmp("n", strAnswer) == 0 ) || ( strcmp("N", strAnswer ) == 0 ) ) - // printf("[->]Exiting procedure now...\n"); - // else - // printf("[->]Erroneous selection\nExiting procedure now....\n"); + PrintAndLog("Writing word %d with data %08X and password %08X", Word, Data, Password); - // //Clean up -- Exit function - // //clear memory, then release pointer. - // if ( pstrInvertBitStream != 0x00000000 ) - // { - // memset(pstrInvertBitStream,0x00,numManchesterDemodBits); - // free(pstrInvertBitStream); - // } - // if ( pTempBuffer != 0x00000000 ) - // { - // memset(pTempBuffer,0x00,MAX_GRAPH_TRACE_LEN); - // free(pTempBuffer); - // } - // if ( pID != 0x00000000 ) - // { - // memset(pID,0x00,11); - // free(pID); - // } - // if ( strBitStreamBuffer != 0x00000000 ) - // { - // memset(strBitStreamBuffer,0x00,numManchesterDemodBits); - // free(strBitStreamBuffer); - // } + c.cmd = CMD_EM4X_WRITE_WORD; + c.d.asBytes[0] = 0x1; //Password mode + c.arg[0] = Data; + c.arg[1] = Word; + c.arg[2] = Password; + SendCommand(&c); return 0; } -int CmdLFEM4X(const char *Cmd) +static command_t CommandTable[] = { - CmdsParse(CommandTable, Cmd); - return 0; + {"help", CmdHelp, 1, "This help"}, + {"em410xdemod", CmdEMdemodASK, 0, "[findone] -- Extract ID from EM410x tag (option 0 for continuous loop, 1 for only 1 tag)"}, + {"em410xread", CmdEM410xRead, 1, "[clock rate] -- Extract ID from EM410x tag in GraphBuffer"}, + {"em410xsim", CmdEM410xSim, 0, " -- Simulate EM410x tag"}, + {"em410xwatch", CmdEM410xWatch, 0, "['h'] -- Watches for EM410x 125/134 kHz tags (option 'h' for 134)"}, + {"em410xspoof", CmdEM410xWatchnSpoof, 0, "['h'] --- Watches for EM410x 125/134 kHz tags, and replays them. (option 'h' for 134)" }, + {"em410xwrite", CmdEM410xWrite, 0, " <'0' T5555> <'1' T55x7> [clock rate] -- Write EM410x UID to T5555(Q5) or T55x7 tag, optionally setting clock rate"}, + {"em4x50read", CmdEM4x50Read, 1, "Extract data from EM4x50 tag"}, + {"readword", CmdReadWord, 1, " -- Read EM4xxx word data"}, + {"readwordPWD", CmdReadWordPWD, 1, " -- Read EM4xxx word data in password mode"}, + {"writeword", CmdWriteWord, 1, " -- Write EM4xxx word data"}, + {"writewordPWD", CmdWriteWordPWD, 1, " -- Write EM4xxx word data in password mode"}, + {NULL, NULL, 0, NULL} +}; + +int CmdLFEM4X(const char *Cmd) { + clearCommandBuffer(); + CmdsParse(CommandTable, Cmd); + return 0; } -int CmdHelp(const char *Cmd) -{ - CmdsHelp(CommandTable); - return 0; +int CmdHelp(const char *Cmd) { + CmdsHelp(CommandTable); + return 0; }