]> git.zerfleddert.de Git - proxmark3-svn/blobdiff - client/cmdcrc.c
updated
[proxmark3-svn] / client / cmdcrc.c
index 6191027f0b4177117027ec48f7d2223a1a056719..4c1c74f54860747058f71fa6678c1c14da1fc32a 100644 (file)
 // CRC Calculations from the software reveng commands
 //-----------------------------------------------------------------------------
 
+#include <stdlib.h>
+#ifdef _WIN32
+#  include <io.h>
+#  include <fcntl.h>
+#  ifndef STDIN_FILENO
+#    define STDIN_FILENO 0
+#  endif /* STDIN_FILENO */
+#endif /* _WIN32 */
+
 #include <stdio.h>
 #include <string.h>
-#include "cmdparser.h"
+#include "cmdmain.h"
 #include "cmdcrc.h"
-//#include "reveng/reveng.h"
-//#include "reveng/cli.h"
-static int CmdHelp(const char *Cmd);
+#include "reveng/reveng.h"
+#include "ui.h"
+#include "util.h"
 
-int CmdCrcCalc(const char *Cmd)
-{
-       //pm3main(Cmd);
+#define MAX_ARGS 20
+
+int uerr(char *msg){
+       PrintAndLog("%s",msg);
        return 0;
 }
 
-static command_t CommandTable[] = 
-{
-       {"help",        CmdHelp,        1, "This help"},
-       {"calc",        CmdCrcCalc,     1, "{ Calculate CRC's }"},
-       {NULL, NULL, 0, NULL}
-};
+int split(char *str, char *arr[MAX_ARGS]){
+    int beginIndex = 0;
+    int endIndex;
+    int maxWords = MAX_ARGS;
+    int wordCnt = 0;
+
+    while(1){
+        while(isspace(str[beginIndex])){
+            ++beginIndex;
+        }
+        if(str[beginIndex] == '\0')
+            break;
+        endIndex = beginIndex;
+        while (str[endIndex] && !isspace(str[endIndex])){
+            ++endIndex;
+        }
+        int len = endIndex - beginIndex;
+        char *tmp = calloc(len + 1, sizeof(char));
+        memcpy(tmp, &str[beginIndex], len);
+        arr[wordCnt++] = tmp;
+        //PrintAndLog("cnt: %d, %s",wordCnt-1, arr[wordCnt-1]);
+        beginIndex = endIndex;
+        if (wordCnt == maxWords)
+            break;
+    }
+    return wordCnt;
+}
 
 int CmdCrc(const char *Cmd)
 {
-  CmdsParse(CommandTable, Cmd);
+       char name[] = {"reveng "};
+       char Cmd2[50 + 7];
+       memcpy(Cmd2, name, 7);
+       memcpy(Cmd2 + 7, Cmd, 50);
+       char *argv[MAX_ARGS];
+       int argc = split(Cmd2, 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) {
+               free(argv[i]);
+       }
+
   return 0; 
 }
 
-int CmdHelp(const char *Cmd)
-{
-  CmdsHelp(CommandTable);
-  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;
+       }
+       /* 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
+                * 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;
 }
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