// 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 <stdlib.h>
#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;
- 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 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)
return 0;
}
+int GetModels(char *Models[], int *count, uint32_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 */
+
+ //unsigned long width = 0UL;
+ //int c, mode = 0, args, psets, pass;
+ poly_t apoly, crc, qpoly = PZERO, *apolys = NULL, *pptr = NULL, *qptr = NULL;
+ model_t pset = model, *candmods, *mptr;
+ //char *string;
+
+ //myname = argv[0];
+
+ /* stdin must be binary */
+ #ifdef _WIN32
+ _setmode(STDIN_FILENO, _O_BINARY);
+ #endif /* _WIN32 */
+
+ SETBMP();
+
+ //pos=0;
+ //optind=1;
+
+ int args = 0, psets, pass;
+ int Cnt = 0;
+ if (*width == 0) { //reveng -D
+ *count = mcount();
+ //PrintAndLog("Count: %d",*count);
+ 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;
+ //PrintAndLog("Size: %d, %s",size,model.name);
+ char *tmp = calloc(size+1, sizeof(char));
+ if (tmp==NULL)
+ return uerr("out of memory?");
+
+ memcpy(tmp, model.name, size);
+ Models[mode] = tmp;
+ //ufound(&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;
+
+
+ /* not going to be sending additional args
+
+ // allocate argument array
+ args = argc - optind;
+ if(!(apolys = malloc(args * sizeof(poly_t))))
+ return uerr("cannot allocate memory for argument list");
+
+ for(pptr = apolys; optind < argc; ++optind) {
+ if(uflags & C_INFILE)
+ *pptr++ = rdpoly(argv[optind], model.flags, ibperhx);
+ else
+ *pptr++ = strtop(argv[optind], model.flags, ibperhx);
+ }
+ // exit value of pptr is used hereafter!
+
+ */
+
+ /* 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();
+ //PrintAndLog("psets: %d",psets);
+ 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;
+ //ufound(&pset);
+ 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);
+ }
+ if(uflags & C_RESULT) {
+ for(qptr = apolys; qptr < pptr; ++qptr)
+ pfree(qptr);
+ return 1;
+ //exit(EXIT_SUCCESS);
+ }
+ 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)) {
+ /* results were printed by the callback
+ * string = mtostr(mptr);
+ * puts(string);
+ * free(string);
+ */
+ 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");
+
+
+ }
+ //PrintAndLog("DONE");
+ return 1;
+}
+
+//test call to GetModels
+int CmdrevengTest(const char *Cmd){
+ char *Models[80];
+ int count = 0;
+ uint32_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);
+ if (!ans) return 0;
+
+ PrintAndLog("Count: %d",count);
+ for (int i = 0; i < count; i++){
+ PrintAndLog("Model %d: %s",i,Models[i]);
+ free(Models[i]);
+ }
+ return 1;
+}
projects / proxmark3-svn / blobdiff