X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/dd1df4901d3b663f30483e53e1fabb50713d9274..34c30823382649d3c66502bd7cc643cf51778b1b:/client/cmdcrc.c diff --git a/client/cmdcrc.c b/client/cmdcrc.c index 839ad0ba..4c1c74f5 100644 --- a/client/cmdcrc.c +++ b/client/cmdcrc.c @@ -19,8 +19,6 @@ #include #include -//#include -//#include #include "cmdmain.h" #include "cmdcrc.h" #include "reveng/reveng.h" @@ -70,17 +68,23 @@ int CmdCrc(const char *Cmd) memcpy(Cmd2 + 7, Cmd, 50); char *argv[MAX_ARGS]; int argc = split(Cmd2, argv); - //PrintAndLog("argc: %d, %s %s Cmd: %s",argc, argv[0], Cmd2, Cmd); - reveng_main(argc, argv); - for(int i = 0; i < argc; ++i){ - //puts(arr[i]); + + if (argc == 3 && memcmp(argv[1],"-g",2)==0) { + CmdrevengSearch(argv[2]); + } else { + reveng_main(argc, argv); + } + //PrintAndLog("DEBUG argc: %d, %s %s Cmd: %s",argc, argv[0], Cmd2, Cmd); + for(int i = 0; i < argc; ++i) { free(argv[i]); } return 0; } -int GetModels(char *Models[], int *count, uint32_t *width){ +//returns array of model names and the count of models returning +// as well as a width array for the width of each model +int GetModels(char *Models[], int *count, uint8_t *width){ /* default values */ static model_t model = { PZERO, /* no CRC polynomial, user must specify */ @@ -105,7 +109,7 @@ int GetModels(char *Models[], int *count, uint32_t *width){ int args = 0, psets, pass; int Cnt = 0; - if (*width == 0) { //reveng -D + if (width[0] == 0) { //reveng -D *count = mcount(); if(!*count) return uerr("no preset models available"); @@ -120,119 +124,127 @@ int GetModels(char *Models[], int *count, uint32_t *width){ memcpy(tmp, model.name, size); Models[mode] = tmp; + width[mode] = plen(model.spoly); } mfree(&model); } else { //reveng -s - if(~model.flags & P_MULXN) - return uerr("cannot search for non-Williams compliant models"); - - praloc(&model.spoly, *width); - praloc(&model.init, *width); - praloc(&model.xorout, *width); - if(!plen(model.spoly)) - palloc(&model.spoly, *width); - else - *width = plen(model.spoly); - - /* special case if qpoly is zero, search to end of range */ - if(!ptst(qpoly)) - rflags &= ~R_HAVEQ; - - /* if endianness not specified, try - * little-endian then big-endian. - * NB: crossed-endian algorithms will not be - * searched. - */ - /* scan against preset models */ - if(~uflags & C_FORCE) { - pass = 0; - Cnt = 0; - do { - psets = mcount(); - - while(psets) { - mbynum(&pset, --psets); - - /* skip if different width, or refin or refout don't match */ - if(plen(pset.spoly) != *width || (model.flags ^ pset.flags) & (P_REFIN | P_REFOUT)) - continue; - /* skip if the preset doesn't match specified parameters */ - if(rflags & R_HAVEP && pcmp(&model.spoly, &pset.spoly)) - continue; - if(rflags & R_HAVEI && psncmp(&model.init, &pset.init)) - continue; - if(rflags & R_HAVEX && psncmp(&model.xorout, &pset.xorout)) - continue; - - apoly = pclone(pset.xorout); - if(pset.flags & P_REFOUT) - prev(&apoly); - for(qptr = apolys; qptr < pptr; ++qptr) { - crc = pcrc(*qptr, pset.spoly, pset.init, apoly, 0); - if(ptst(crc)) { - pfree(&crc); - break; - } else - pfree(&crc); - } - pfree(&apoly); - if(qptr == pptr) { - /* the selected model solved all arguments */ - mcanon(&pset); - - size_t size = (pset.name && *pset.name) ? strlen(pset.name) : 6; - //PrintAndLog("Size: %d, %s, count: %d",size,pset.name, Cnt); - char *tmp = calloc(size+1, sizeof(char)); - - if (tmp == NULL){ - PrintAndLog("out of memory?"); - return 0; - } - memcpy(tmp, pset.name, size); - Models[Cnt++] = tmp; - *count = Cnt; - uflags |= C_RESULT; - } - } - mfree(&pset); + if(~model.flags & P_MULXN) + return uerr("cannot search for non-Williams compliant models"); - /* toggle refIn/refOut and reflect arguments */ - if(~rflags & R_HAVERI) { - model.flags ^= P_REFIN | P_REFOUT; - for(qptr = apolys; qptr < pptr; ++qptr) - prevch(qptr, ibperhx); - } - } while(~rflags & R_HAVERI && ++pass < 2); - } - if(uflags & C_RESULT) { - for(qptr = apolys; qptr < pptr; ++qptr) - pfree(qptr); - } - if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT)) - return uerr("cannot search for crossed-endian models"); + praloc(&model.spoly, (unsigned long)width[0]); + praloc(&model.init, (unsigned long)width[0]); + praloc(&model.xorout, (unsigned long)width[0]); + + if(!plen(model.spoly)) + palloc(&model.spoly, (unsigned long)width[0]); + else + width[0] = (uint8_t)plen(model.spoly); + /* special case if qpoly is zero, search to end of range */ + if(!ptst(qpoly)) + rflags &= ~R_HAVEQ; + + /* if endianness not specified, try + * little-endian then big-endian. + * NB: crossed-endian algorithms will not be + * searched. + */ + /* scan against preset models */ + if(~uflags & C_FORCE) { pass = 0; + Cnt = 0; do { - mptr = candmods = reveng(&model, qpoly, rflags, args, apolys); - if(mptr && plen(mptr->spoly)) - uflags |= C_RESULT; - while(mptr && plen(mptr->spoly)) { - mfree(mptr++); + psets = mcount(); + + while(psets) { + mbynum(&pset, --psets); + + /* skip if different width, or refin or refout don't match */ + if(plen(pset.spoly) != width[0] || (model.flags ^ pset.flags) & (P_REFIN | P_REFOUT)) + continue; + /* skip if the preset doesn't match specified parameters */ + if(rflags & R_HAVEP && pcmp(&model.spoly, &pset.spoly)) + continue; + if(rflags & R_HAVEI && psncmp(&model.init, &pset.init)) + continue; + if(rflags & R_HAVEX && psncmp(&model.xorout, &pset.xorout)) + continue; + + //for additional args (not used yet, maybe future?) + apoly = pclone(pset.xorout); + if(pset.flags & P_REFOUT) + prev(&apoly); + + for(qptr = apolys; qptr < pptr; ++qptr) { + crc = pcrc(*qptr, pset.spoly, pset.init, apoly, 0); + if(ptst(crc)) { + pfree(&crc); + break; + } else + pfree(&crc); + } + pfree(&apoly); + if(qptr == pptr) { + + /* the selected model solved all arguments */ + + mcanon(&pset); + + size_t size = (pset.name && *pset.name) ? strlen(pset.name) : 6; + //PrintAndLog("Size: %d, %s, count: %d",size,pset.name, Cnt); + char *tmp = calloc(size+1, sizeof(char)); + if (tmp == NULL){ + PrintAndLog("out of memory?"); + return 0; + } + width[Cnt] = width[0]; + memcpy(tmp, pset.name, size); + Models[Cnt++] = tmp; + *count = Cnt; + uflags |= C_RESULT; + } } - free(candmods); + mfree(&pset); + + /* toggle refIn/refOut and reflect arguments */ if(~rflags & R_HAVERI) { model.flags ^= P_REFIN | P_REFOUT; for(qptr = apolys; qptr < pptr; ++qptr) prevch(qptr, ibperhx); } } while(~rflags & R_HAVERI && ++pass < 2); + } + //got everything now free the memory... + + if(uflags & C_RESULT) { for(qptr = apolys; qptr < pptr; ++qptr) pfree(qptr); - free(apolys); - if(~uflags & C_RESULT) - return uerr("no models found"); - mfree(&model); + } + if(!(model.flags & P_REFIN) != !(model.flags & P_REFOUT)) + return uerr("cannot search for crossed-endian models"); + + pass = 0; + do { + mptr = candmods = reveng(&model, qpoly, rflags, args, apolys); + if(mptr && plen(mptr->spoly)) + uflags |= C_RESULT; + while(mptr && plen(mptr->spoly)) { + mfree(mptr++); + } + free(candmods); + if(~rflags & R_HAVERI) { + model.flags ^= P_REFIN | P_REFOUT; + for(qptr = apolys; qptr < pptr; ++qptr) + prevch(qptr, ibperhx); + } + } while(~rflags & R_HAVERI && ++pass < 2); + for(qptr = apolys; qptr < pptr; ++qptr) + pfree(qptr); + free(apolys); + if(~uflags & C_RESULT) + return uerr("no models found"); + mfree(&model); } return 1; @@ -258,7 +270,6 @@ int RunModel(char *inModel, char *inHexStr, bool reverse, char endian, char *res int ibperhx = 8, obperhx = 8; int rflags = 0; // search flags int c; - unsigned long width = 0UL; poly_t apoly, crc; char *string; @@ -277,8 +288,6 @@ int RunModel(char *inModel, char *inHexStr, bool reverse, char endian, char *res if(c < 0) return uerr("no preset models available"); - // must set width so that parameter to -ipx is not zeroed - width = plen(model.spoly); rflags |= R_HAVEP | R_HAVEI | R_HAVERI | R_HAVERO | R_HAVEX; //set flags @@ -308,9 +317,13 @@ int RunModel(char *inModel, char *inHexStr, bool reverse, char endian, char *res model.flags &= ~P_RTJUST; break; } - + /* canonicalise the model, so the one we dump is the one we + * calculate with (not with -s, spoly may be blank which will + * normalise to zero and clear init and xorout.) + */ mcanon(&model); + if (reverse) { // v calculate reversed CRC /* Distinct from the -V switch as this causes @@ -365,3 +378,99 @@ int RunModel(char *inModel, char *inHexStr, bool reverse, char endian, char *res pfree(&apoly); return 1; } +//returns a calloced string (needs to be freed) +char *SwapEndianStr(const char *inStr, const size_t len, const uint8_t blockSize){ + char *tmp = calloc(len+1, sizeof(char)); + for (uint8_t block=0; block < (uint8_t)(len/blockSize); block++){ + for (size_t i = 0; i < blockSize; i+=2){ + tmp[i+(blockSize*block)] = inStr[(blockSize-1-i-1)+(blockSize*block)]; + tmp[i+(blockSize*block)+1] = inStr[(blockSize-1-i)+(blockSize*block)]; + } + } + return tmp; +} + +// takes hex string in and searches for a matching result (hex string must include checksum) +int CmdrevengSearch(const char *Cmd){ + char inHexStr[50] = {0x00}; + int dataLen = param_getstr(Cmd, 0, inHexStr); + if (dataLen < 4) return 0; + + char *Models[80]; + int count = 0; + uint8_t width[80]; + width[0] = 0; + uint8_t crcChars = 0; + char result[30]; + char revResult[30]; + int ans = GetModels(Models, &count, width); + bool found = false; + if (!ans) return 0; + + // try each model and get result + for (int i = 0; i < count; i++){ + /*if (found) { + free(Models[i]); + continue; + }*/ + // round up to # of characters in this model's crc + crcChars = ((width[i]+7)/8)*2; + // can't test a model that has more crc digits than our data + if (crcChars >= dataLen) + continue; + memset(result, 0, 30); + char *inCRC = calloc(crcChars+1, sizeof(char)); + memcpy(inCRC, inHexStr+(dataLen-crcChars), crcChars); + + char *outHex = calloc(dataLen-crcChars+1, sizeof(char)); + memcpy(outHex, inHexStr, dataLen-crcChars); + + //PrintAndLog("DEBUG: dataLen: %d, crcChars: %d, Model: %s, CRC: %s, width: %d, outHex: %s",dataLen, crcChars, Models[i], inCRC, width[i], outHex); + ans = RunModel(Models[i], outHex, false, 0, result); + if (ans) { + //test for match + if (memcmp(result, inCRC, crcChars)==0){ + PrintAndLog("\nFound a possible match!\nModel: %s\nValue: %s\n",Models[i], result); + //optional - stop searching if found... + found = true; + } else { + if (crcChars > 2){ + char *swapEndian = SwapEndianStr(result, crcChars, crcChars); + if (memcmp(swapEndian, inCRC, crcChars)==0){ + PrintAndLog("\nFound a possible match!\nModel: %s\nValue EndianSwapped: %s\n",Models[i], swapEndian); + //optional - stop searching if found... + found = true; + } + free(swapEndian); + } + } + } + + //if (!found){ + ans = RunModel(Models[i], outHex, true, 0, revResult); + if (ans) { + //test for match + if (memcmp(revResult, inCRC, crcChars)==0){ + PrintAndLog("\nFound a possible match!\nModel Reversed: %s\nValue: %s\n",Models[i], revResult); + //optional - stop searching if found... + found = true; + } else { + if (crcChars > 2){ + char *swapEndian = SwapEndianStr(revResult, crcChars, crcChars); + if (memcmp(swapEndian, inCRC, crcChars)==0){ + PrintAndLog("\nFound a possible match!\nModel Reversed: %s\nValue EndianSwapped: %s\n",Models[i], swapEndian); + //optional - stop searching if found... + found = true; + } + free(swapEndian); + } + } + } + //} + free(inCRC); + free(outHex); + free(Models[i]); + } + if (!found) PrintAndLog("\nNo matches found\n"); + return 1; +}