CareerCup

I am not going to draw a flow chart, but will include the working program. In essence it does the following:

1. Gets key
2. Opens input and output files
3. Reads every line from input file
4. XOR's every character from the read line and puts into a temporary buffer
5. writes the buffer to the output file

#include <iostream>
#include <sstream>
#include <fstream>
#include <string>
using namespace std;

int main(int argc, char* argv[])
{
    try
    {
        if (argc < 4)
        {
            cout << argv[0] << "\n";
            cout << "Usage: cipher key infile outfile\n";
        }
        else
        {
            string line;
            stringstream ss;
            ss << argv[1];
            unsigned int key = 0;
            ss >> key;
            cout << "Key is " << key << "\n";
            if (key > 255)
            {
                cerr << "Key value is to high 255 < " << key << "\n";
                return 1;
            }
            ifstream infile(argv[2]);
            ofstream outfile(argv[3]);
            if (infile.is_open())
            {
                while (infile.good())
                {
                    getline(infile, line);
                    int lineLen = line.length();
                    if (lineLen > 4096)
                    {
                        cerr << "String in file is too long 4096 < " << lineLen << "\n";
                        infile.close();
                        outfile.close();
                        return 1;
                    }

                    char toCipher[lineLen];
                    for (int ii = 0; ii < lineLen; ii++)
                    {
                        toCipher[ii] = line[ii] ^ key;
                    }
                    outfile << toCipher;
                }
                infile.close();
                outfile.close();
            }
        }
        return 0;
    }
    catch(...)
    {
        cerr << "An unknown error occured." << endl;
        return 1;
    }

}

We can store the placeholder in the file to indicate that file is encrypted and hash of the key also, hash of the key can be used during decryption.

hey can we please get this in c language?

hi there :) i tried to run that program in Dev++ plus it was jus cutting off it was not running! could anyone please help me out with why is that so? you see i am really new to c programming so i need lots of help.

thank you