X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/2e16354693c5b0b2ea03a7824e6f9e527c0a66e9..4efdfbe638e5366aa838025f9c250333cb0fab74:/client/cmdcrc.c diff --git a/client/cmdcrc.c b/client/cmdcrc.c index f756cde4..01f65f55 100644 --- a/client/cmdcrc.c +++ b/client/cmdcrc.c @@ -8,7 +8,6 @@ // CRC Calculations from the software reveng commands //----------------------------------------------------------------------------- -#include #ifdef _WIN32 # include # include @@ -19,8 +18,8 @@ #include #include -//#include -//#include +#include +#include #include "cmdmain.h" #include "cmdcrc.h" #include "reveng/reveng.h" @@ -44,9 +43,10 @@ int split(char *str, char *arr[MAX_ARGS]){ while(isspace(str[beginIndex])){ ++beginIndex; } - if(str[beginIndex] == '\0') + if(str[beginIndex] == '\0') { break; - endIndex = beginIndex; + } + endIndex = beginIndex; while (str[endIndex] && !isspace(str[endIndex])){ ++endIndex; } @@ -54,7 +54,7 @@ int split(char *str, char *arr[MAX_ARGS]){ char *tmp = calloc(len + 1, sizeof(char)); memcpy(tmp, &str[beginIndex], len); arr[wordCnt++] = tmp; - //PrintAndLog("cnt: %d, %s",wordCnt-1, arr[wordCnt-1]); + //PrintAndLog("DEBUG cnt: %d, %s",wordCnt-1, arr[wordCnt-1]); beginIndex = endIndex; if (wordCnt == maxWords) break; @@ -70,17 +70,23 @@ 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); + + 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; } -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 +111,7 @@ 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"); @@ -120,6 +126,7 @@ 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 @@ -127,13 +134,13 @@ int GetModels(char *Models[], int *count, uint32_t *width){ 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); + 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, *width); + palloc(&model.spoly, (unsigned long)width[0]); else - *width = plen(model.spoly); + width[0] = (uint8_t)plen(model.spoly); /* special case if qpoly is zero, search to end of range */ if(!ptst(qpoly)) @@ -173,7 +180,7 @@ int GetModels(char *Models[], int *count, uint32_t *width){ 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)) + 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)) @@ -210,6 +217,7 @@ int GetModels(char *Models[], int *count, uint32_t *width){ PrintAndLog("out of memory?"); return 0; } + width[Cnt] = width[0]; memcpy(tmp, pset.name, size); Models[Cnt++] = tmp; *count = Cnt; @@ -264,18 +272,20 @@ int GetModels(char *Models[], int *count, uint32_t *width){ int CmdrevengTest(const char *Cmd){ char *Models[80]; int count = 0; - uint32_t width = 0; + uint8_t widtharr[80] = {0}; + uint8_t width = 0; width = param_get8(Cmd, 0); //PrintAndLog("width: %d",width); if (width > 89) return uerr("Width cannot exceed 89"); - int ans = GetModels(Models, &count, &width); + widtharr[0] = width; + int ans = GetModels(Models, &count, widtharr); if (!ans) return 0; PrintAndLog("Count: %d",count); for (int i = 0; i < count; i++){ - PrintAndLog("Model %d: %s",i,Models[i]); + PrintAndLog("Model %d: %s, width: %d",i,Models[i], widtharr[i]); free(Models[i]); } return 1; @@ -301,7 +311,7 @@ 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; + //unsigned long width; poly_t apoly, crc; char *string; @@ -321,7 +331,7 @@ int RunModel(char *inModel, char *inHexStr, bool reverse, char endian, char *res return uerr("no preset models available"); // must set width so that parameter to -ipx is not zeroed - width = plen(model.spoly); + //width = plen(model.spoly); rflags |= R_HAVEP | R_HAVEI | R_HAVERI | R_HAVERO | R_HAVEX; //set flags @@ -438,3 +448,100 @@ int CmdrevengTestC(const char *Cmd){ PrintAndLog("Result: %s",result); 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; +}