//****************************************************************************
ErrorCode MD5UtilCore::processCollide (const CommandLineOptions& options, std::string& output) {
static const std::string& NO_COLLISION_FOUND = "No collision found for current hash with given settings.";
if (options.getHelpMode ()) {
std::cout << MSG_COLLIDE_HELP << std::endl;
return ErrorCode::NONE;
}
if (options.getInputText ().length () == 0 || options.getAlphabet ().length () == 0) {
return ErrorCode::COLLIDE_USAGE_ERROR;
}
if (findCollision (options, output)) {
if (options.getOutputFilename ().length () != 0) {
if (!saveToFile (options.getOutputFilename (), output)) {
return ErrorCode::FILE_WRITE_ERROR;
}
}
} else {
output = NO_COLLISION_FOUND;
}
return ErrorCode::NONE;
}
//****************************************************************************
void MD5UtilCore::checkCollisionRange (const CommandLineOptions& options, bool& solutionFound, std::string& output, const unsigned int threadIndex) {
static const unsigned int MAX_DIGITS = 16;
unsigned int threadCount = 1;
unsigned int maxDigits = options.getMaxLength ();
unsigned int minDigits = options.getMinLength ();
uint_least64_t range = 0;
uint_least64_t startIndex = 0;
VBUInt plaintextGenerator (0, options.getAlphabet ().length ());
std::string plaintextToTest;
if (options.getThreadCount () > 1) {
threadCount = options.getThreadCount ();
}
if (options.getMinLength () == 0 || options.getMinLength () > options.getMaxLength ()) {
minDigits = 1;
}
if (options.getMaxLength () == 0 || options.getMaxLength () < options.getMinLength ()) {
maxDigits = MAX_DIGITS;
}
range = plaintextGenerator.maxValue (maxDigits) / threadCount;
startIndex = range * threadIndex;
plaintextGenerator.setBaseTenValue (startIndex);
for (; plaintextGenerator < VBUInt (startIndex + range); plaintextGenerator++) {
for (unsigned int digits = minDigits; digits <= maxDigits; digits++) {
if (solutionFound) {
break;
} else {
plaintextToTest = plaintextGenerator.toString (options.getAlphabet ().getCharacters (), digits);
if (hash (plaintextToTest) == options.getInputText ()) {
solutionFound = true;
output = plaintextToTest;
break;
}
}
}
}
}
