//XOR Encrypt 0.0.2
//by Sean Kane - http://celtickane.com

#include <stdio.h>
#include <stdlib.h> //needed for exit()
#include <string.h>

#define MAX_SIZE 80	//change this if you want larger buffers

void crypt(char bufData[], char bufKey[]);

int main()
{
	char bufData[MAX_SIZE], bufKey[MAX_SIZE];
	char chrPrompt;

	for (;;)
	{
		printf("(E)ncrypt, (D)ecrypt, (Q)uit: ");
		chrPrompt = getchar();

		switch( chrPrompt)
		{
		case 'e': case 'E':
			fflush(stdin);	//Get rid of any garbage
			printf("Enter word to encrypt: ");
			gets(bufData);
			
			printf("Enter encryption key: ");
			gets(bufKey);

			crypt(bufData, bufKey);

			printf("Encrypted data: %s\n", bufData);
			break;
		case 'd': case 'D':
			fflush(stdin);	//Get rid of any garbage
			printf("Enter word to decrypt: ");
			gets(bufData);
			
			printf("Enter encryption key: ");
			gets(bufKey);

			crypt(bufData, bufKey);

			printf("Decrypted data: %s\n", bufData);
			break;
		case 'q': case 'Q':
			exit(1);
			break;
		default:
			printf("Please type E, D, or Q\n");
			break;
		} //end switch
	} //end for
	
	return 0;
} //end main


void crypt(char bufData[], char bufKey[])
{
	int iData, iKey;

	iKey = 0;
	for(iData = 0; iData < strlen(bufData); iData++)
	{
		bufData[iData] = bufData[iData] ^ bufKey[iKey];
		(iKey == (strlen(bufKey) -1)) ? iKey = 0 : iKey++;
	}
}