need some help, fellaz

Bmxpunk86pl · Oct 11, 2002

Hey wuts up

Ok im writing a little encryption progarm in C++, here is my souce code:

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

int main(int argc, char *argv[])
{
char string [10] = "adam";

char key [10] = "abcd";

string = string ^ key;

system ("pause");

return 0;
}

I try to compile this program but i get a error saying
"invalid operands 'char[10' to binary 'operator^'

Can anyone help me?

Thanks,
Adam

XWRed1 · Oct 11, 2002

Probably can't exponentiate with a char. Try assigning the values of a, b, c, d to an int array or something.

More complex encryption uses matrix multiplication.

naif · Oct 12, 2002

It says that because you are trying to assign an address to an array, and an array's name is a constant pointer. It cannot be changed.

string = string ^ key;

It should be

*string = *string ^ *key;

In this way, you are derefering the first value pointed to by the array variable string which would in this case be the character "a".

Krusty · Oct 12, 2002

Never tried it myself, but I'm guessing you can't do a binary XOR on an array, which is what those are. Try doing a for loop to go through and XOR each individual character in the string.

for(int i = 0; i < 10; i++)
{
string = string ^ key;
}

and if you can't XOR chars, just cast them as ints before doing the conversion.

naif · Oct 12, 2002

You can definately XOR characters

Here's a sample program I am showing, though it only encrypts the string using one single character

Code:

#include <stdio.h>
#include <string.h>
int main(int argc, char *argv[])
{
	char string[] = "Naif";
        char key = 'X'; /* The value of key is used for xoring the string */
	int count;	/* Counter */

	printf("string before encryption: %s\n\n",string);

	for(count = 0;count < strlen(string);count++)
		string[count] = string[count] ^ key;

/*
        You could also use a faster algorithm/method which could be

	count = 0;
	while(*(string+count) != NULL) {
		*(string+count) = *(string+count) ^ key;
		count++;
	}

	This isnt the most optimising method, there are too many methods
	to show	here
*/

	printf("string after encryption: %s\n",string);
}

Bmxpunk86pl · Oct 12, 2002

ok thanks alot...wuts "matrix multiplication"?

Also what can i classify my encryption as? 5 bit?

naif · Oct 13, 2002

Matrix Multiplication: http://www.mai.liu.se/~halun/matrix/matrix.html

It just shows what it is, doesnot state any of its uses

need some help, fellaz

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