X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/proxmark3-svn/blobdiff_plain/a71ece51e49f739e0eff8022e6c5d66813d1aa56..207fc33a4252560197931244b1e888d5cc3994c7:/client/cmdcrc.c

diff --git a/client/cmdcrc.c b/client/cmdcrc.c
index 984815d9..4c1c74f5 100644
--- a/client/cmdcrc.c
+++ b/client/cmdcrc.c
@@ -8,10 +8,17 @@
 // 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>
-//#include <ctype.h>
 #include "cmdmain.h"
 #include "cmdcrc.h"
 #include "reveng/reveng.h"
@@ -20,6 +27,11 @@
 
 #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;
@@ -56,13 +68,409 @@ int CmdCrc(const char *Cmd)
 	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);
-	for(int i = 0; i < argc; ++i){
-		//puts(arr[i]);
+
+	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;
+
+		/* 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;
+}