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#include <cstdlib>
#include <stdexcept>
#include <fstream>
#include <iostream>
#define KEY_LEN 11
// Code originaly credited by "Invo" and provided ASIS
// found here: http://www.scorehero.com/forum/viewtopic.php?t=39923
// This code code be use to "decrypt" ".xen" files used in at least GH3 PC
// key should be guessed (xor)
char SwapByteBits(unsigned char cInput) {
unsigned char nResult=0;
for(unsigned int i = 0 ; i < 8 ; i++) {
nResult = nResult << 1;
nResult |= (cInput & 1);
cInput = cInput >> 1;
}
return nResult;
}
// TODO: use boost iterator to decode in one line
int main(int argc, char** argv) {
unsigned char cpKey[KEY_LEN] = "5atu6w4zaw";
// Check params
if (argc != 3) throw std::runtime_error(std::string("Usage: ") + argv[0] + " <Input> <Output>");
// Open files
std::ofstream outputFile(argv[2], std::ofstream::binary);
std::ifstream inputFile(argv[1], std::ios::binary);
// Get the file size
inputFile.seekg (0, std::ios::end);
unsigned int fileSize = inputFile.tellg();
inputFile.seekg (0, std::ios::beg);
// Allocate buffer
char *pBuffer = new char[fileSize];
// Reading inputfile
std::cout << "Reading input file (" << fileSize << " Bytes)... ";
inputFile.read(pBuffer, fileSize);
inputFile.close();
std::cout << "DONE!" << std::endl;
// Decrypt
std::cout << "Decrypting... ";
char *pInput = pBuffer;
for (unsigned int nLoopIdx = 0 ; nLoopIdx < fileSize ; nLoopIdx++) {
*pInput = SwapByteBits(*pInput ^ cpKey[nLoopIdx % (KEY_LEN-1)]);
pInput++;
}
std::cout << "DONE!" << std::endl;
// Write the output
std::cout << "Writing outpout file... ";
outputFile.write(pBuffer, fileSize);
outputFile.close();
delete [] pBuffer;
std::cout << "DONE!" << std::endl;
return EXIT_SUCCESS;
}
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