mirror of
https://github.com/RfidResearchGroup/proxmark3.git
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491 lines
16 KiB
C
491 lines
16 KiB
C
//-----------------------------------------------------------------------------
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// Copyright (C) 2015 iceman <iceman at iuse.se>
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//
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// This code is licensed to you under the terms of the GNU GPL, version 2 or,
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// at your option, any later version. See the LICENSE.txt file for the text of
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// the license.
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//-----------------------------------------------------------------------------
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// CRC Calculations from the software reveng commands
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//-----------------------------------------------------------------------------
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#include "cmdcrc.h"
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#define MAX_ARGS 20
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static int split(char *str, char *arr[MAX_ARGS]) {
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int beginIndex = 0;
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int endIndex;
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int maxWords = MAX_ARGS;
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int wordCnt = 0;
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while (1) {
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while (isspace(str[beginIndex])) {
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++beginIndex;
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}
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if (str[beginIndex] == '\0') {
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break;
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}
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endIndex = beginIndex;
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while (str[endIndex] && !isspace(str[endIndex])) {
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++endIndex;
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}
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int len = endIndex - beginIndex;
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char *tmp = calloc(len + 1, sizeof(char));
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memcpy(tmp, &str[beginIndex], len);
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arr[wordCnt++] = tmp;
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beginIndex = endIndex;
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if (wordCnt == maxWords)
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break;
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}
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return wordCnt;
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}
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//returns array of model names and the count of models returning
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// as well as a width array for the width of each model
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int GetModels(char *Models[], int *count, uint8_t *width) {
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/* default values */
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static model_t model = MZERO;
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int ibperhx = 8;//, obperhx = 8;
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int rflags = 0, uflags = 0; /* search and UI flags */
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poly_t apoly, crc, qpoly = PZERO, *apolys = NULL, *pptr = NULL, *qptr = NULL;
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model_t pset = model, *candmods, *mptr;
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/* stdin must be binary */
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#ifdef _WIN32
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_setmode(STDIN_FILENO, _O_BINARY);
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#endif /* _WIN32 */
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SETBMP();
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if (width[0] == 0) { //reveng -D
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*count = mcount();
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if (!*count) {
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PrintAndLogEx(WARNING, "no preset models available");
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return 0;
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}
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for (int mode = 0; mode < *count; ++mode) {
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mbynum(&model, mode);
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mcanon(&model);
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size_t size = (model.name && *model.name) ? strlen(model.name) : 7;
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char *tmp = calloc(size + 1, sizeof(char));
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if (tmp == NULL) {
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PrintAndLogEx(WARNING, "out of memory?");
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return 0;
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}
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if (model.name != NULL) {
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memcpy(tmp, model.name, size);
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Models[mode] = tmp;
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width[mode] = plen(model.spoly);
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}
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}
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mfree(&model);
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} else { //reveng -s
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if (~model.flags & P_MULXN) {
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PrintAndLogEx(WARNING, "cannot search for non-Williams compliant models");
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return 0;
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}
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praloc(&model.spoly, (unsigned long)width[0]);
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praloc(&model.init, (unsigned long)width[0]);
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praloc(&model.xorout, (unsigned long)width[0]);
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if (!plen(model.spoly))
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palloc(&model.spoly, (unsigned long)width[0]);
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else
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width[0] = (uint8_t)plen(model.spoly);
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/* special case if qpoly is zero, search to end of range */
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if (!ptst(qpoly))
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rflags &= ~R_HAVEQ;
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int pass;
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/* if endianness not specified, try
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* little-endian then big-endian.
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* NB: crossed-endian algorithms will not be
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* searched.
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*/
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/* scan against preset models */
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if (~uflags & C_NOPCK) {
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pass = 0;
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int Cnt = 0, psets;
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do {
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psets = mcount();
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while (psets) {
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mbynum(&pset, --psets);
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/* skip if different width, or refin or refout don't match */
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if (plen(pset.spoly) != width[0] || (model.flags ^ pset.flags) & (P_REFIN | P_REFOUT))
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continue;
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/* skip if the preset doesn't match specified parameters */
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if (rflags & R_HAVEP && pcmp(&model.spoly, &pset.spoly))
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continue;
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if (rflags & R_HAVEI && psncmp(&model.init, &pset.init))
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continue;
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if (rflags & R_HAVEX && psncmp(&model.xorout, &pset.xorout))
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continue;
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//for additional args (not used yet, maybe future?)
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apoly = pclone(pset.xorout);
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if (pset.flags & P_REFOUT)
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prev(&apoly);
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for (qptr = apolys; qptr < pptr; ++qptr) {
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crc = pcrc(*qptr, pset.spoly, pset.init, apoly, 0);
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if (ptst(crc)) {
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pfree(&crc);
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break;
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}
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pfree(&crc);
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}
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pfree(&apoly);
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if (qptr == pptr) {
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/* the selected model solved all arguments */
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mcanon(&pset);
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size_t size = (pset.name && *pset.name) ? strlen(pset.name) : 7;
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//PrintAndLogEx(NORMAL, "Size: %d, %s, count: %d",size,pset.name, Cnt);
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char *tmp = calloc(size + 1, sizeof(char));
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if (tmp == NULL) {
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PrintAndLogEx(WARNING, "out of memory?");
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return 0;
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}
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width[Cnt] = width[0];
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memcpy(tmp, pset.name, size);
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Models[Cnt++] = tmp;
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*count = Cnt;
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uflags |= C_RESULT;
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}
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}
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mfree(&pset);
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/* toggle refIn/refOut and reflect arguments */
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if (~rflags & R_HAVERI) {
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model.flags ^= P_REFIN | P_REFOUT;
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for (qptr = apolys; qptr < pptr; ++qptr) {
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prevch(qptr, ibperhx);
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}
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}
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} while (~rflags & R_HAVERI && ++pass < 2);
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}
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//got everything now free the memory...
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if (uflags & C_RESULT) {
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for (qptr = apolys; qptr < pptr; ++qptr) {
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pfree(qptr);
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}
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}
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if (uflags & C_NOBFS && ~rflags & R_HAVEP) {
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PrintAndLogEx(WARNING, "no models found");
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return 0;
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}
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if (!(model.flags & P_REFIN) != !(model.flags & P_REFOUT)) {
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PrintAndLogEx(WARNING, "cannot search for crossed-endian models");
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return 0;
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}
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pass = 0;
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int args = 0;
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do {
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mptr = candmods = reveng(&model, qpoly, rflags, args, apolys);
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if (mptr && plen(mptr->spoly)) {
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uflags |= C_RESULT;
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}
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while (mptr && plen(mptr->spoly)) {
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mfree(mptr++);
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}
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free(candmods);
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if (~rflags & R_HAVERI) {
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model.flags ^= P_REFIN | P_REFOUT;
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for (qptr = apolys; qptr < pptr; ++qptr) {
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prevch(qptr, ibperhx);
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}
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}
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} while (~rflags & R_HAVERI && ++pass < 2);
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for (qptr = apolys; qptr < pptr; ++qptr) {
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pfree(qptr);
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}
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free(apolys);
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mfree(&model);
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if (~uflags & C_RESULT) {
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PrintAndLogEx(WARNING, "no models found");
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return 0;
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}
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}
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return 1;
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}
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//-c || -v
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//inModel = valid model name string - CRC-8
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//inHexStr = input hex string to calculate crc on
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//reverse = reverse calc option if true
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//endian = {0 = calc default endian input and output, b = big endian input and output, B = big endian output, r = right justified
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// l = little endian input and output, L = little endian output only, t = left justified}
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//result = calculated crc hex string
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int RunModel(char *inModel, char *inHexStr, bool reverse, char endian, char *result) {
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/* default values */
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static model_t model = MZERO;
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int ibperhx = 8, obperhx = 8;
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// int rflags = 0; // search flags
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int c;
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poly_t apoly, crc;
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char *string;
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// stdin must be binary
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#ifdef _WIN32
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_setmode(STDIN_FILENO, _O_BINARY);
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#endif /* _WIN32 */
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SETBMP();
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//set model
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c = mbynam(&model, inModel);
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if (!c) {
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PrintAndLogEx(WARNING, "error: preset model '%s' not found. Use reveng -D to list presets. [%d]", inModel, c);
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return 0;
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}
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if (c < 0) {
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PrintAndLogEx(WARNING, "no preset models available");
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return 0;
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}
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// rflags |= R_HAVEP | R_HAVEI | R_HAVERI | R_HAVERO | R_HAVEX;
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//set flags
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switch (endian) {
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case 'b': /* b big-endian (RefIn = false, RefOut = false ) */
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model.flags &= ~P_REFIN;
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//rflags |= R_HAVERI;
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/* fall through: */
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case 'B': /* B big-endian output (RefOut = false) */
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model.flags &= ~P_REFOUT;
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//rflags |= R_HAVERO;
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mnovel(&model);
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/* fall through: */
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case 'r': /* r right-justified */
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model.flags |= P_RTJUST;
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break;
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case 'l': /* l little-endian input and output */
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model.flags |= P_REFIN;
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//rflags |= R_HAVERI;
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/* fall through: */
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case 'L': /* L little-endian output */
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model.flags |= P_REFOUT;
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//rflags |= R_HAVERO;
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mnovel(&model);
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/* fall through: */
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case 't': /* t left-justified */
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model.flags &= ~P_RTJUST;
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break;
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}
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/* canonicalise the model, so the one we dump is the one we
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* calculate with (not with -s, spoly may be blank which will
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* normalise to zero and clear init and xorout.)
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*/
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mcanon(&model);
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if (reverse) {
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// v calculate reversed CRC
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/* Distinct from the -V switch as this causes
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* the arguments and output to be reversed as well.
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*/
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// reciprocate Poly
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prcp(&model.spoly);
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/* mrev() does:
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* if(refout) prev(init); else prev(xorout);
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* but here the entire argument polynomial is
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* reflected, not just the characters, so RefIn
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* and RefOut are not inverted as with -V.
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* Consequently Init is the mirror image of the
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* one resulting from -V, and so we have:
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*/
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if (~model.flags & P_REFOUT) {
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prev(&model.init);
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prev(&model.xorout);
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}
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// swap init and xorout
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apoly = model.init;
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model.init = model.xorout;
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model.xorout = apoly;
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}
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// c calculate CRC
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/* in the Williams model, xorout is applied after the refout stage.
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* as refout is part of ptostr(), we reverse xorout here.
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*/
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if (model.flags & P_REFOUT)
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prev(&model.xorout);
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apoly = strtop(inHexStr, model.flags, ibperhx);
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if (reverse)
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prev(&apoly);
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crc = pcrc(apoly, model.spoly, model.init, model.xorout, model.flags);
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if (reverse)
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prev(&crc);
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string = ptostr(crc, model.flags, obperhx);
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for (int i = 0; i < 50; i++) {
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result[i] = string[i];
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if (result[i] == 0) break;
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}
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free(string);
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pfree(&crc);
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pfree(&apoly);
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return 1;
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}
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/*
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//test call to RunModel
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static int CmdrevengTestC(const char *Cmd) {
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int cmdp = 0;
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char inModel[30] = {0x00};
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char inHexStr[30] = {0x00};
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char result[30];
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int dataLen;
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char endian = 0;
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dataLen = param_getstr(Cmd, cmdp++, inModel, sizeof(inModel));
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if (dataLen < 4) return 0;
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dataLen = param_getstr(Cmd, cmdp++, inHexStr, sizeof(inHexStr));
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if (dataLen < 4) return 0;
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bool reverse = (param_get8(Cmd, cmdp++)) ? true : false;
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endian = param_getchar(Cmd, cmdp++);
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//PrintAndLogEx(NORMAL, "mod: %s, hex: %s, rev %d", inModel, inHexStr, reverse);
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int ans = RunModel(inModel, inHexStr, reverse, endian, result);
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if (!ans) return 0;
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PrintAndLogEx(SUCCESS, "result: %s", result);
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return 1;
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}
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*/
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//returns a calloced string (needs to be freed)
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static char *SwapEndianStr(const char *inStr, const size_t len, const uint8_t blockSize) {
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char *tmp = calloc(len + 1, sizeof(char));
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for (uint8_t block = 0; block < (uint8_t)(len / blockSize); block++) {
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for (size_t i = 0; i < blockSize; i += 2) {
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tmp[i + (blockSize * block)] = inStr[(blockSize - 1 - i - 1) + (blockSize * block)];
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tmp[i + (blockSize * block) + 1] = inStr[(blockSize - 1 - i) + (blockSize * block)];
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}
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}
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return tmp;
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}
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// takes hex string in and searches for a matching result (hex string must include checksum)
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static int CmdrevengSearch(const char *Cmd) {
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#define NMODELS 106
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char inHexStr[100] = {0x00};
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int dataLen = param_getstr(Cmd, 0, inHexStr, sizeof(inHexStr));
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if (dataLen < 4) return 0;
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// these two arrays, must match preset size.
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char *Models[NMODELS];
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uint8_t width[NMODELS] = {0};
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int count = 0;
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uint8_t crcChars;
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char result[30];
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char revResult[30];
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int ans = GetModels(Models, &count, width);
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bool found = false;
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if (!ans) return 0;
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// try each model and get result
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for (int i = 0; i < count; i++) {
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/*if (found) {
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free(Models[i]);
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continue;
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}*/
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// round up to # of characters in this model's crc
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crcChars = ((width[i] + 7) / 8) * 2;
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// can't test a model that has more crc digits than our data
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if (crcChars >= dataLen)
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continue;
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memset(result, 0, 30);
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char *inCRC = calloc(crcChars + 1, sizeof(char));
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memcpy(inCRC, inHexStr + (dataLen - crcChars), crcChars);
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char *outHex = calloc(dataLen - crcChars + 1, sizeof(char));
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memcpy(outHex, inHexStr, dataLen - crcChars);
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PrintAndLogEx(DEBUG, "DEBUG: dataLen: %d, crcChars: %d, Model: %s, CRC: %s, width: %d, outHex: %s", dataLen, crcChars, Models[i], inCRC, width[i], outHex);
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ans = RunModel(Models[i], outHex, false, 0, result);
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if (ans) {
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// test for match
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if (memcmp(result, inCRC, crcChars) == 0) {
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PrintAndLogEx(SUCCESS, "\nfound possible match\nmodel: %s | value: %s\n", Models[i], result);
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//optional - stop searching if found...
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found = true;
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} else {
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if (crcChars > 2) {
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char *swapEndian = SwapEndianStr(result, crcChars, crcChars);
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if (memcmp(swapEndian, inCRC, crcChars) == 0) {
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PrintAndLogEx(SUCCESS, "\nfound possible match\nmodel: %s | value endian swapped: %s\n", Models[i], swapEndian);
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// optional - stop searching if found...
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found = true;
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}
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free(swapEndian);
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}
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}
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}
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ans = RunModel(Models[i], outHex, true, 0, revResult);
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if (ans) {
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// test for match
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if (memcmp(revResult, inCRC, crcChars) == 0) {
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PrintAndLogEx(SUCCESS, "\nfound possible match\nmodel reversed: %s | value: %s\n", Models[i], revResult);
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// optional - stop searching if found...
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found = true;
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} else {
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if (crcChars > 2) {
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char *swapEndian = SwapEndianStr(revResult, crcChars, crcChars);
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if (memcmp(swapEndian, inCRC, crcChars) == 0) {
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PrintAndLogEx(SUCCESS, "\nfound possible match\nmodel reversed: %s | value endian swapped: %s\n", Models[i], swapEndian);
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// optional - stop searching if found...
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found = true;
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}
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free(swapEndian);
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}
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}
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}
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free(inCRC);
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free(outHex);
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free(Models[i]);
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}
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if (!found) PrintAndLogEx(FAILED, "\nno matches found\n");
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return 1;
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}
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int CmdCrc(const char *Cmd) {
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char name[] = {"reveng "};
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char Cmd2[100 + 7];
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memcpy(Cmd2, name, 7);
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memcpy(Cmd2 + 7, Cmd, 100);
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char *argv[MAX_ARGS];
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int argc = split(Cmd2, argv);
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if (argc == 3 && memcmp(argv[1], "-g", 2) == 0) {
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CmdrevengSearch(argv[2]);
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} else {
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reveng_main(argc, argv);
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}
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for (int i = 0; i < argc; ++i) {
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free(argv[i]);
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}
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return 0;
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}
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