Decrypt .ini, and use values? - c++

Question

I have a XOR function:
string encryptDecrypt(string toEncrypt) {
char key[64] = { 'F', '2', 'D', 'C', '5', '4', '0', 'D', 'B', 'F', '3', 'E', '1', '2', '9', 'F', '4', 'E', 'A', 'A', 'F', '7', '6', '7', '5', '6', '9', 'E', '3', 'C', 'F', '9', '7', '5', '2', 'B', '4', 'B', '8', '2', '6', 'D', '9', '8', 'F', 'D', '8', '3', '8', '4', '6', '0', '8', '5', 'C', '0', '3', '7', 'D', '3', '5', 'F', '7', '5' };
string output = toEncrypt;
for (int i = 0; i < toEncrypt.size(); i++)
output[i] = toEncrypt[i] ^ key[i % (sizeof(key) / sizeof(char))];
return output;
}
I encrypted my .ini :
[test]
baubau = 1
haha = 2
sometext = blabla
How i tried to decrypt and use values:
std::string Filename = "abc.ini";
std::ifstream input(Filename, std::ios::binary | ios::in); // Open the file
std::string line; // Temp variable
std::vector<std::string> lines; // Vector for holding all lines in the file
while (std::getline(input, line)) // Read lines as long as the file is
{
lines.push_back(encryptDecrypt(line));
}
// Here i should call the ini reader? but how?
CIniReader iniReader("abc.ini");
string my = encryptDecrypt(iniReader.ReadString("test", "baubau", ""));
for (auto s : lines)
{
cout << my;
cout << endl;
}
Where is my mistake? Some help would be apreciated, Many Thanks!

Answer 1

What you can do is:
Read the file line by line, and break apart keys and values, i.e. where you see 'key=value' break it apart into key and value.
Encrypt the value.
Base64-encode the value, in case it is no longer valid text in the encoding of the file.
Replace the line with 'key=base64-encoded-value'.
Later, when you read the encoded value for the key, which is just a simple Base64-encoded string of bytes, Base64-decode the string, and the decrypt the value.
For example, this line:
baubau = 1
Take the value '1' as a string, and encrypt it with your function. The result in this case is a printable string 'w'. However, I would treat it as arbitrary bytes.
Base64-encode the "encrypted" value. For example, the Base64-encoding of 'w' in UTF-8 (or ASCII) is "dw==".
Replace the line with:
baubau = dw==
or, if you like:
baubau = "dw=="
Later, when you read the value for baubau, you simply Base64-decode 'dw==', obtaining 'w', and then decrypt 'w' to arrive at '1'.