X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/a71ece51e49f739e0eff8022e6c5d66813d1aa56..3c4061697950f897e195dd77b6e471ca462dd3fb:/client/cmdcrc.c diff --git a/client/cmdcrc.c b/client/cmdcrc.c index 984815d9..666b4a8e 100644 --- a/client/cmdcrc.c +++ b/client/cmdcrc.c @@ -8,6 +8,15 @@ // CRC Calculations from the software reveng commands //----------------------------------------------------------------------------- +#include +#ifdef _WIN32 +# include +# include +# ifndef STDIN_FILENO +# define STDIN_FILENO 0 +# endif /* STDIN_FILENO */ +#endif /* _WIN32 */ + #include #include //#include @@ -20,6 +29,11 @@ #define MAX_ARGS 20 +int uerr(char *msg){ + PrintAndLog("%s",msg); + return 0; +} + int split(char *str, char *arr[MAX_ARGS]){ int beginIndex = 0; int endIndex; @@ -56,13 +70,404 @@ 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); + + 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){ - //puts(arr[i]); free(argv[i]); } return 0; } +//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 */ + PZERO, /* Init = 0 */ + P_BE, /* RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h */ + PZERO, /* XorOut = 0 */ + PZERO, /* check value unused */ + NULL /* no model name */ + }; + + int ibperhx = 8;//, obperhx = 8; + int rflags = 0, uflags = 0; /* search and UI flags */ + poly_t apoly, crc, qpoly = PZERO, *apolys = NULL, *pptr = NULL, *qptr = NULL; + model_t pset = model, *candmods, *mptr; + + /* stdin must be binary */ + #ifdef _WIN32 + _setmode(STDIN_FILENO, _O_BINARY); + #endif /* _WIN32 */ + + SETBMP(); + + int args = 0, psets, pass; + int Cnt = 0; + if (width[0] == 0) { //reveng -D + *count = mcount(); + if(!*count) + return uerr("no preset models available"); + + for(int mode = 0; mode < *count; ++mode) { + mbynum(&model, mode); + mcanon(&model); + size_t size = (model.name && *model.name) ? strlen(model.name) : 6; + char *tmp = calloc(size+1, sizeof(char)); + if (tmp==NULL) + return uerr("out of memory?"); + + 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, (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 { + 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; + } + } + 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); + } + 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; +} + +//-c || -v +//inModel = valid model name string - CRC-8 +//inHexStr = input hex string to calculate crc on +//reverse = reverse calc option if true +//endian = {0 = calc default endian input and output, b = big endian input and output, B = big endian output, r = right justified +// l = little endian input and output, L = little endian output only, t = left justified} +//result = calculated crc hex string +int RunModel(char *inModel, char *inHexStr, bool reverse, char endian, char *result){ + /* default values */ + static model_t model = { + PZERO, // no CRC polynomial, user must specify + PZERO, // Init = 0 + P_BE, // RefIn = false, RefOut = false, plus P_RTJUST setting in reveng.h + PZERO, // XorOut = 0 + PZERO, // check value unused + NULL // no model name + }; + int ibperhx = 8, obperhx = 8; + int rflags = 0; // search flags + int c; + poly_t apoly, crc; + + char *string; + + // stdin must be binary + #ifdef _WIN32 + _setmode(STDIN_FILENO, _O_BINARY); + #endif /* _WIN32 */ + + SETBMP(); + //set model + if(!(c = mbynam(&model, inModel))) { + PrintAndLog("error: preset model '%s' not found. Use reveng -D to list presets.", inModel); + return 0; + } + if(c < 0) + return uerr("no preset models available"); + + rflags |= R_HAVEP | R_HAVEI | R_HAVERI | R_HAVERO | R_HAVEX; + + //set flags + switch (endian) { + case 'b': /* b big-endian (RefIn = false, RefOut = false ) */ + model.flags &= ~P_REFIN; + rflags |= R_HAVERI; + /* fall through: */ + case 'B': /* B big-endian output (RefOut = false) */ + model.flags &= ~P_REFOUT; + rflags |= R_HAVERO; + mnovel(&model); + /* fall through: */ + case 'r': /* r right-justified */ + model.flags |= P_RTJUST; + break; + case 'l': /* l little-endian input and output */ + model.flags |= P_REFIN; + rflags |= R_HAVERI; + /* fall through: */ + case 'L': /* L little-endian output */ + model.flags |= P_REFOUT; + rflags |= R_HAVERO; + mnovel(&model); + /* fall through: */ + case 't': /* t left-justified */ + model.flags &= ~P_RTJUST; + break; + } + + mcanon(&model); + + if (reverse) { + // v calculate reversed CRC + /* Distinct from the -V switch as this causes + * the arguments and output to be reversed as well. + */ + // reciprocate Poly + prcp(&model.spoly); + + /* mrev() does: + * if(refout) prev(init); else prev(xorout); + * but here the entire argument polynomial is + * reflected, not just the characters, so RefIn + * and RefOut are not inverted as with -V. + * Consequently Init is the mirror image of the + * one resulting from -V, and so we have: + */ + if(~model.flags & P_REFOUT) { + prev(&model.init); + prev(&model.xorout); + } + + // swap init and xorout + apoly = model.init; + model.init = model.xorout; + model.xorout = apoly; + } + // c calculate CRC + + /* in the Williams model, xorout is applied after the refout stage. + * as refout is part of ptostr(), we reverse xorout here. + */ + if(model.flags & P_REFOUT) + prev(&model.xorout); + + apoly = strtop(inHexStr, model.flags, ibperhx); + + if(reverse) + prev(&apoly); + + crc = pcrc(apoly, model.spoly, model.init, model.xorout, model.flags); + + if(reverse) + prev(&crc); + + string = ptostr(crc, model.flags, obperhx); + for (int i = 0; i < 50; i++){ + result[i] = string[i]; + if (result[i]==0) break; + } + free(string); + pfree(&crc); + 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; +}