// CRC Calculations from the software reveng commands
//-----------------------------------------------------------------------------
-#include <stdlib.h>
#ifdef _WIN32
# include <io.h>
# include <fcntl.h>
#include <stdio.h>
#include <string.h>
-//#include <stdlib.h>
-//#include <ctype.h>
+#include <stdlib.h>
+#include <ctype.h>
#include "cmdmain.h"
#include "cmdcrc.h"
#include "reveng/reveng.h"
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;
}
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;
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 */
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");
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, *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))
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))
PrintAndLog("out of memory?");
return 0;
}
+ width[Cnt] = width[0];
memcpy(tmp, pset.name, size);
Models[Cnt++] = tmp;
*count = Cnt;
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;
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;
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
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;
+}
projects / proxmark3-svn / blobdiff