X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/ff9c043da29150aa785723326537ba93ddac0614..6f93185537e17bebe27f42c8558338e7f04b7d68:/client/cmdlfem4x.c diff --git a/client/cmdlfem4x.c b/client/cmdlfem4x.c index 636d2596..1150595c 100644 --- a/client/cmdlfem4x.c +++ b/client/cmdlfem4x.c @@ -305,7 +305,6 @@ uint32_t OutputEM4x50_Block(uint8_t *BitStream, size_t size, bool verbose, bool //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; @@ -500,7 +499,7 @@ int CmdEM4x50Read(const char *Cmd) { } int usage_lf_em_read(void) { - PrintAndLog("Read EM4x50. Tag must be on antenna. "); + PrintAndLog("Read EM 4x05/4x50/EM4x69. Tag must be on antenna. "); PrintAndLog(""); PrintAndLog("Usage: lf em readword [h]
"); PrintAndLog("Options:"); @@ -512,6 +511,151 @@ int usage_lf_em_read(void) { PrintAndLog(" lf em readword 1 11223344"); return 0; } + +int usage_lf_em_write(void) { + PrintAndLog("Write EM 4x05/4x50/4x69. Tag must be on antenna. "); + PrintAndLog(""); + PrintAndLog("Usage: lf em writeword [h]
"); + 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 writeword 1"); + PrintAndLog(" lf em writeword 1 deadc0de 11223344"); + return 0; +} + +#define EM_PREAMBLE_LEN 6 +// download samples from device +// and copy them 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; +} +//search for given preamble in given BitStream and return success=1 or fail=0 and startIndex +bool doPreambleSearch(size_t *startIdx){ + + // sanity check + if ( DemodBufferLen < EM_PREAMBLE_LEN) { + if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 demodbuffer too small"); + return FALSE; + } + + // 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}; + + // set size to 10 to only test first 4 positions for the preamble + size_t size = (10 > DemodBufferLen) ? DemodBufferLen : 10; + *startIdx = 0; + uint8_t found = 0; + + // em only sends preamble once, so look for it once in the first x bits + for (int idx = 0; idx < size - EM_PREAMBLE_LEN; idx++){ + if (memcmp(DemodBuffer+idx, preamble, EM_PREAMBLE_LEN) == 0){ + //first index found + *startIdx = idx; + found = 1; + break; + } + } + + if ( !found) { + 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 - EM4305: FSK clock failed"); + return FALSE; + } + // demod + int ans = FSKrawDemod("0 0", FALSE); + if (!ans) { + if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: 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 - EM4305: PSK clock failed"); + return FALSE; + } + PrintAndLog("PSK response possibly found, run `data rawd p1` to attempt to demod"); + 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 - EM4305: 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 - EM4305: ASK/biphase normal demod failed"); + + ans = ASKbiphaseDemod("0 1 1", FALSE); + if (!ans) { + if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/biphase inverted demod failed"); + return FALSE; + } + } + return TRUE; +} + +// param: idx - start index in demoded data. +int setDemodBufferEM(uint8_t bitsNeeded, size_t idx){ + if ( bitsNeeded < DemodBufferLen) { + setDemodBuf(DemodBuffer + idx + EM_PREAMBLE_LEN, bitsNeeded, 0); + CmdPrintDemodBuff("x"); + return 1; + } + return -1; +} + +// 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... +int demodEM4x05resp(uint8_t bitsNeeded) { + + size_t startIdx = 0; + + if (detectASK_MAN() && doPreambleSearch( &startIdx )) + return setDemodBufferEM(bitsNeeded, startIdx); + + if (detectASK_BI() && doPreambleSearch( &startIdx )) + return setDemodBufferEM(bitsNeeded, startIdx); + + if (detectFSK() && doPreambleSearch( &startIdx )) + return setDemodBufferEM(bitsNeeded, startIdx); + + if (detectPSK() && doPreambleSearch( &startIdx )) + return setDemodBufferEM(bitsNeeded, startIdx); + + return -1; +} + int CmdReadWord(const char *Cmd) { int addr, pwd; bool usePwd = false; @@ -540,70 +684,26 @@ int CmdReadWord(const char *Cmd) { PrintAndLog("Command timed out"); return -1; } - - uint8_t got[6000]; - GetFromBigBuf(got, sizeof(got), 0); - if ( !WaitForResponseTimeout(CMD_ACK, NULL, 2500) ) { - PrintAndLog("command execution time out"); - return -1; - } - setGraphBuf(got, sizeof(got)); - - - int ans = 0; - //bool ST = true; - DemodBufferLen = 0x00; - //ans = ASKDemod_ext("0 0 1", FALSE, FALSE, 1, &ST); - ans = ASKbiphaseDemod("0 0 1", FALSE); - if (!ans) { - if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/Manchester Demod failed"); + if (!downloadSamplesEM()) return -1; - } - - size_t startIdx = 0, size = DemodBufferLen; - - PrintAndLog("ANS: %d | %u | %u", ans, startIdx, size); - - uint8_t preamble[8] = {0,0,0,0,1,0,1,0}; - uint8_t errChk = !preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx); - if ( errChk == 0) { - if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", startIdx); - return -1; - } - - // sanity check. - if (size != 32) { - if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 incorrect data length found, %u", size ); + int testLen = (GraphTraceLen < 1000) ? GraphTraceLen : 1000; + if (graphJustNoise(GraphBuffer, testLen)) { + PrintAndLog("Tag not found"); return -1; } - //setDemodBuf(BitStream, 32, preambleIndex); - - return 1; + //attempt demod: + //need 32 bits from a read word + return demodEM4x05resp(44); } -int usage_lf_em_write(void) { - PrintAndLog("Write EM4x50. Tag must be on antenna. "); - PrintAndLog(""); - PrintAndLog("Usage: lf em writeword [h]
"); - 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 writeword 1"); - PrintAndLog(" lf em writeword 1 deadc0de 11223344"); - return 0; -} int CmdWriteWord(const char *Cmd) { uint8_t ctmp = param_getchar(Cmd, 0); if ( strlen(Cmd) == 0 || ctmp == 'H' || ctmp == 'h' ) return usage_lf_em_write(); - bool usePwd = false; - + bool usePwd = false; int addr = 16; // default to invalid address int data = 0xFFFFFFFF; // default to blank data int pwd = 0xFFFFFFFF; // default to blank password @@ -612,7 +712,6 @@ int CmdWriteWord(const char *Cmd) { data = param_get32ex(Cmd, 1, -1, 16); pwd = param_get32ex(Cmd, 2, -1, 16); - if ( (addr > 15) || (addr < 0 ) || ( addr == -1) ) { PrintAndLog("Address must be between 0 and 15"); return 1; @@ -635,37 +734,18 @@ int CmdWriteWord(const char *Cmd) { return -1; } - //get response if there is one - uint8_t got[6000]; // 8 bit preamble + 32 bit word response (max clock (128) * 40bits = 5120 samples) - GetFromBigBuf(got, sizeof(got), 0); - if ( !WaitForResponseTimeout(CMD_ACK, NULL, 8000) ) { - PrintAndLog("command execution time out"); - return -2; - } - setGraphBuf(got, sizeof(got)); - - int ans = 0; - //bool ST = true; - DemodBufferLen = 0x00; + if (!downloadSamplesEM()) + return -1; - //ans = ASKDemod_ext("0 0 1", FALSE, FALSE, 1, &ST); - ans = ASKbiphaseDemod("0 0 1", FALSE); - if (!ans) { - if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305: ASK/Manchester Demod failed"); - return -3; - } - PrintAndLog("ANS: %d", ans); + //todo: check response for 00001010 then write data for write confirmation! - //todo: check response for 00001010 then write data for write confirmation! - size_t startIdx = 0, size = DemodBufferLen; + //attempt demod: + //need 0 bits demoded (after preamble) to verify write cmd + int result = demodEM4x05resp(0); + if (result == 1) + PrintAndLog("Write Verified"); - uint8_t preamble[8] = {0,0,0,0,1,0,1,0}; - if (!preambleSearch(DemodBuffer, preamble, sizeof(preamble), &size, &startIdx)){ - if (g_debugMode) PrintAndLog("DEBUG: Error - EM4305 preamble not found :: %d", startIdx); - return -4; - } - PrintAndLog("Write OK"); - return 0; + return result; } static command_t CommandTable[] = {