+++ /dev/null
-//-----------------------------------------------------------------------------
-// Copyright (C) 2015 iceman <iceman at iuse.se>
-//
-// This code is licensed to you under the terms of the GNU GPL, version 2 or,
-// at your option, any later version. See the LICENSE.txt file for the text of
-// the license.
-//-----------------------------------------------------------------------------
-// CRC Calculations from the software reveng commands
-//-----------------------------------------------------------------------------
-
-#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>
-#include <ctype.h>
-#include "cmdmain.h"
-#include "cmdcrc.h"
-#include "reveng/reveng.h"
-#include "ui.h"
-#include "util.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((unsigned char)str[beginIndex])){
- ++beginIndex;
- }
- if(str[beginIndex] == '\0') {
- break;
- }
- endIndex = beginIndex;
- while (str[endIndex] && !isspace((unsigned char)str[endIndex])){
- ++endIndex;
- }
- int len = endIndex - beginIndex;
- char *tmp = calloc(len + 1, sizeof(char));
- memcpy(tmp, &str[beginIndex], len);
- arr[wordCnt++] = tmp;
- //PrintAndLog("DEBUG cnt: %d, %s",wordCnt-1, arr[wordCnt-1]);
- beginIndex = endIndex;
- if (wordCnt == maxWords)
- break;
- }
- return wordCnt;
-}
-
-int CmdCrc(const char *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;
-}
-
-//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;
-
-
- /* not going to be sending additional args at this time (maybe future?)
-
- // 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[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;
-}
-
-//test call to GetModels
-int CmdrevengTest(const char *Cmd){
- char *Models[80];
- int count = 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");
-
- 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, width: %d",i,Models[i], widtharr[i]);
- free(Models[i]);
- }
- 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;
- //unsigned long width;
- 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))) {
- fprintf(stderr,"error: preset model '%s' not found. Use reveng -D to list presets.\n", inModel);
- return 0;
- }
- if(c < 0)
- return uerr("no preset models available");
-
- // must set width so that parameter to -ipx is not zeroed
- //width = plen(model.spoly);
- 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
-
- // validate inputs
- /* if(plen(model.spoly) == 0) {
- * fprintf(stderr,"%s: no polynomial specified for -%c (add -w WIDTH -p POLY)\n", myname, mode);
- * exit(EXIT_FAILURE);
- * }
- */
-
- /* 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;
-}
-
-//test call to RunModel
-int CmdrevengTestC(const char *Cmd){
- int cmdp = 0;
- char inModel[30] = {0x00};
- char inHexStr[30] = {0x00};
- char result[30];
- int dataLen;
- char endian = 0;
- dataLen = param_getstr(Cmd, cmdp++, inModel, sizeof(inModel));
- if (dataLen < 4) return 0;
- dataLen = param_getstr(Cmd, cmdp++, inHexStr, sizeof(inHexStr));
- if (dataLen < 4) return 0;
- bool reverse = (param_get8(Cmd, cmdp++)) ? true : false;
- endian = param_getchar(Cmd, cmdp++);
-
- //PrintAndLog("mod: %s, hex: %s, rev %d", inModel, inHexStr, reverse);
- int ans = RunModel(inModel, inHexStr, reverse, endian, result);
- if (!ans) return 0;
-
- 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, sizeof(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;
-}
projects / proxmark3-svn / blobdiff