X-Encrypter

This is a discussion on X-Encrypter within the C++ Programming forums, part of the General Programming Boards category; After reading a tutorial on XOR encryption at cplusplus.com I decided to code this super program called X-Encrypter, just so ...

  1. #1
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    Jul 2010
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    X-Encrypter

    After reading a tutorial on XOR encryption at cplusplus.com I decided to code
    this super program called X-Encrypter, just so I can practice what I've learned
    from tutorials.
    This is what it does: it can create xor-encrypted text files from scratch,
    it can read xor-encrypted text files, and it also allows the user to
    set the encryption key.
    This is what ive come up with so far:

    Code:
    #include <stdio.h>
    #include <stdlib.h>
    #include <iostream>
    #include <fstream>
    #include <string>
    
    using namespace std;
    
    string key="k";
    
    void commandScreen(int& command);
    void readXorFile(fstream& file);
    void newXorFile(fstream& file);
    void setKey(string& key);
    void encrypt(string str, string& newStr);
    
    int main()
    {
        int c=0; // stores command chosen by user
        fstream file;
    
        do
        {
             commandScreen(c);
    
             switch(c)
             {
                  case 1:
                  readXorFile(file);
                  break;
    
                  case 2:
                  newXorFile(file);
                  break;
    
                  case 3:
                  setKey(key);
                  break;
             }
    
        }
        while(c != 0);
    
        cout<<"\n\nAstalavista.\n";
    }
    
    
    void commandScreen(int& command)
    {
         cout<<"\n*************************************************\n**************** X-ENCRYPTER 0.1 ****************\n*************************************************\n";
    
         cout<<"\n1-> READ ENCRYPTED TEXT"<<endl;
         cout<<"2-> NEW ECRYPTED TEXT"<<endl;
         cout<<"3-> SET ENCRYPTION KEY"<<endl;
         cout<<"\nCOMMAND: ";
         cin>>command;
    }
    
    void setKey(string& key)
    {
        cout<<"\KEY: ";
        cin>>key;
        cout<<"Key set to '"<<key<<"'"<<endl;
        system("PAUSE");
    
    }
    
    void readXorFile(fstream& file)
    {
        char filePath[100];
        string encTxt;
        string result;
        cout<<"\nENCRYPTED FILE: ";
        cin>>filePath;
        file.open(filePath,ios::in);
        if(file.is_open())
        {
            file>>encTxt;
            encrypt(encTxt,result);
            cout<<"\nResult: "<<result<<"\n";
            system("PAUSE");
        }
        else
        {
            cout<<"\nThere's no such file '"<<filePath<<"'\n";
            system("PAUSE");
        }
        file.close();
    }
    
    void newXorFile(fstream& file)
    {
        char filePath[100]; // it wont allow me to use string on fstream::open()
        cout<<"\nNEW FILE: ";
        cin>>filePath;
    
        file.open(filePath,ios::out | ios::binary);
        //binary because it doesnt need to be txt file
    
        if(file.is_open())
        {
            string txt;
            string enc; // stores encrypted text
            cout<<"TEXT: ";
            cin>>txt;
            encrypt(txt,enc);
            file<<enc;
            cout<<"\nEncrypted text stored into '"<<filePath<<"'\n";
            system("PAUSE");
        }
        else
        {
           cout<<"Couldn't create file...\n";
           system("PAUSE");
        }
    
        file.close();
    
    }
    
    void encrypt(string str, string& newStr)
    {
        newStr=str;
        int strLen = str.length() - 1;
        int keyLen = key.length();
    
        for(int x=0; x <= strLen; x++)
        {
            newStr[x] = str[x]^key[x % keyLen];
        }
    }
    Now these are the issues i've bumped into so far:

    1-)No matter how simple it might seem to be, the key setter function never works
    right, example: the default key is 'k', but when manually changing it to 'k' it works differently.

    2-)When creating a new file, typing the text to be saved, if you enter a spacebar the program will loop infinitely, i dont know why

    3-)Somehow I cant figure out how to make the fstream.open() function work with string, I even tried type casting, but it doenst work...

    4-)When choosing to read a encrypted file, when it tries to read the character 'a' it stops reading...

  2. #2
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    Jul 2008
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    36
    Quote Originally Posted by dhuan View Post
    3-)Somehow I cant figure out how to make the fstream.open() function work with string, I even tried type casting, but it doenst work...
    See this bit of code:

    Code:
    std::string filename("long\path\to\file.txt");
    
    const char* filename_str = filename.c_str();
    
    fstream file(filename_str);

  3. #3
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    Jul 2010
    Posts
    56
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