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ADD: Added a new main command group "analyse", first one is the find the missing XOR in a LCR, it was a python script under /tools/xorfind.py

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iceman1001 2016-05-10 15:30:46 +02:00
commit 812513bf90
5 changed files with 100 additions and 8 deletions
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//-----------------------------------------------------------------------------
// Copyright (C) 2016 iceman
//
// 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.
//-----------------------------------------------------------------------------
// Analyse bytes commands
//-----------------------------------------------------------------------------
#include "cmdanalyse.h"
static int CmdHelp(const char *Cmd);
int usage_analyse_lcr(void) {
PrintAndLog("Specifying the bytes of a UID with a known LRC will find the last byte value");
PrintAndLog("needed to generate that LRC with a rolling XOR. All bytes should be specified in HEX.");
PrintAndLog("");
PrintAndLog("Usage: analyse lcr [h] <bytes>");
PrintAndLog("Options:");
PrintAndLog(" h This help");
PrintAndLog(" <bytes> bytes to calc missing XOR in a LCR");
PrintAndLog("");
PrintAndLog("Samples:");
PrintAndLog(" analyse lcr 04008064BA");
PrintAndLog("expected output: Target (BA) requires final LRC XOR byte value: 5A");
return 0;
}
static uint8_t calculateLRC( uint8_t* bytes, uint8_t len) {
uint8_t LRC = 0;
for (uint8_t i = 0; i < len; i++)
LRC ^= bytes[i];
return LRC;
}
int CmdAnalyseLCR(const char *Cmd) {
uint8_t data[50];
char cmdp = param_getchar(Cmd, 0);
if (strlen(Cmd) == 0|| cmdp == 'h' || cmdp == 'H') return usage_analyse_lcr();
int len = 0;
param_gethex_ex(Cmd, 0, data, &len);
if ( len%2 ) return usage_analyse_lcr();
len >>= 1;
uint8_t finalXor = calculateLRC(data, len);
PrintAndLog("Target [%02X] requires final LRC XOR byte value: 0x%02X",data[len-1] ,finalXor);
return 0;
}
static command_t CommandTable[] = {
{"help", CmdHelp, 1, "This help"},
{"lcr", CmdAnalyseLCR, 0, "Generate final byte for XOR LRC"},
{NULL, NULL, 0, NULL}
};
int CmdAnalyse(const char *Cmd) {
clearCommandBuffer();
CmdsParse(CommandTable, Cmd);
return 0;
}
int CmdHelp(const char *Cmd) {
CmdsHelp(CommandTable);
return 0;
}