Frustration

k,
I understand what you said but It stil won't work for me???
Here is my decrypt code.

Code:

#include <iostream.h>
#include <stdlib.h>
#include <fstream.h>

int main()
{ char a[502];
  char b[502];
  char c[502];
  ofstream a_file("unencrypt.txt");
  ifstream b_file("encrypt1.txt");
  cout<<"\n\t\t*******Your Encrypted Text***********";
  b_file>>c;
  cout<<c;
     for(int x=0; x<502; x++)
     {
       a[x]=b[x]^c[x];
       cout<<a;
       a_file<<a;
     }
     a_file.close();
     b_file.close();
     cout<<"\n\n Well Thats Your Files. The Unencrypted\ntext will be in a txt file\named unencrypt.txt";
      system("PAUSE");
      return 0;}

And it still gives me a bunch of gibbity gork text (which i know is encrypted) I want it to output the text that was input into another program and encrypted to a text file??????
here is my encrytion source????

Code:

#include <iostream.h>
#include <stdlib.h>
#include <fstream>


int main()
{ char a[502];
  char out[502];
  char c[502];
  char b[20]="DgFGH51ja8Md-klagf1";
  ofstream a_file("encrypt1.txt");
  cout<<"\n\n\t\t********Please Input Less Then 500 Chars*********\n\n";
  cin>>a;
  cout<<"\n\n\t\t ***********This Is Your Encoded Text*************** \n\n";
  for(int x=0; x<502; x++)
  {
    c[x]=a[x]^b[x];
    cout<<c[x];
    a_file<<c[x];
  }
  
  cout<<"\n\nWell Thats It. Encrypted Text Will Be Written In A 'encrypt.txt' file\n\n";
    a_file.close();
    system("PAUSE");
    return 0;
}

Please can you help me???????

Thanx


Kas

by the way I am looking for some help with XOR encryption and such.

Kas,

No need to have 2 threads to deal with your 1 problem.

for(int problem=1;problem<code;problem++) createthread();

Give me a couple of hours. I'll try and look at your code and see what's wrong. My youngest is asking for me... and you don't want to make a 3 year old your enemy

either b and a need to be the same length or b has to be a single char.

You need to work on your use of streams.
First, you declare c as an array of 502 chars, then you attempt to read a file into c using only 1 >>. If your lucky that will get the first char from the file into the first index (0) of the array c.
A good way to read from files is either 1 char at a time checking for eof each iteration of a loop, or to read line by line using a string. You still have to check for eof each iteration


Here is a function i wrote to do XOR (de)/(en)cryption to a file. It uses iostream.h stdio.h and string.h
Check out the code challenge of this issue of the c journal
http://www.cprogramming.com/codej/issue2.html
It uses FILE *'s instead of streams, you should be able to change it becuase it is commented

Code:

int XOR(char * filename, unsigned long key)
{
	char * outfilename = NULL;
	int len = strlen(filename);
	unsigned char buffer;

	if( (filename[len-4] == '.') && (filename[len-3] == 'e') && (filename[len-2] == 'n') && (filename[len-1] == 'c') )
	{
		// our input file is encoded then we will create a file without the .end extension

		outfilename = new char[len+1]; //make room for the name+\0
		strcpy(outfilename,filename); //copy the string name
		outfilename[len-4] = '\0'; //put the \0 before the .enc extension to cut it off

	}
	else
	{
		outfilename = new char[len+5]; //make room for the name + .enc + \0
		strcpy(outfilename,filename); //copy the file name
		strncat(outfilename,".enc",4); //add the .enc extension

	}

	input =	fopen(filename,"rb");
	if( input == NULL)
	{
		cout << "Error opening file " << filename << endl;
		delete [] outfilename; //free the memory before leaving
		outfilename = NULL;
		return 1;
	}
	
	output = fopen(outfilename,"wb");
	if( output == NULL )
	{
		cout << "Error creating output file " << outfilename << endl;
		delete [] outfilename; //free the mem before leaving
		outfilename = NULL;
		return 1;
	}
	while( ! feof(input) )
	{
		//get some data
		if( fread(&buffer,sizeof(unsigned char),1,input) != 1 )
		{
			//if we didnt get any data, but we are not at the eof, then an error has occured
			if( ! feof(input) )
			{
				delete [] outfilename;
				outfilename = NULL;
				fclose(input);
				fclose(output);
				
				return 1;
			}
		}
		else
		{
			//xor that data
			buffer ^= key; 
		
			//write some data
			fwrite(&buffer,sizeof(unsigned char),1,output);
		}
	}
	//close the files and free that memory
	fclose(input);
	fclose(output);
	delete [] outfilename;

	return 0;
}