Porcupine

// dctdialog.cpp : implementation file
//

#include "stdafx.h"
#include "eikona.h"
#include "dctdialog.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// dctdialog dialog


dctdialog::dctdialog(CWnd* pParent /*=NULL*/)
	: CDialog(dctdialog::IDD, pParent)
{
	//{{AFX_DATA_INIT(dctdialog)
	m_message ="You can put here the creators / owners name, date of creation, copyright notice or anything that will confirm the owner";
	m_key ="";
	m_result ="UnScrambled";
	//}}AFX_DATA_INIT
}


void dctdialog::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(dctdialog)
	DDX_Text(pDX, IDC_MESSAGE, m_message);
	DDX_Text(pDX, IDC_KEY, m_key);
	DDX_Text(pDX, IDC_RESULT, m_result);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(dctdialog, CDialog)
	//{{AFX_MSG_MAP(dctdialog)
	ON_BN_CLICKED(IDC_SCRAMBLE, OnScramble)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// dctdialog message handlers

void dctdialog::OnScramble() 
{
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);

		if (m_message.GetLength()<m_key.GetLength())
		AfxMessageBox("Key can't be longer than the message!");
		else
		{
			if (m_key.GetLength()!=8)
			AfxMessageBox("8 - digits");
			else
			{
			int length=m_message.GetLength();

			unsigned char *message=new unsigned char[length];

			for (int j=0;j<length;j++)
			message[j]=m_message[j];


			for (int k=0;k<length;k=k+8)
			{
			if (k+8>length)
			break;
		
			message[k+0]^=m_key[0];				//xoring every 8 bytes
			message[k+1]^=m_key[1];
			message[k+2]^=m_key[2];
			message[k+3]^=m_key[3];
			message[k+4]^=m_key[4];
			message[k+5]^=m_key[5];
			message[k+6]^=m_key[6];
			message[k+7]^=m_key[7];
			}

			m_message.Empty();

			for (int q=0;q<length;q++)
			m_message+=message[q];

			m_result="Scrambled";

			delete message;
			}
		}

	UpdateData(FALSE);
}