Click here to Skip to main content
Click here to Skip to main content
Add your own
alternative version

Build your own cryptographically safe server/client protocol

, 21 Jun 2006 CPOL
This article presents all you need to implement your own secure protocol using variable keysize RSA encryption/decryption, digital signing, multi precision library, Diffie-Hellman key exchange, Rijndael, and more. Everything is converged into a secure IOCP client/server chat server.
// RanDialog.cpp : implementation file
//

#include "stdafx.h"
#include "RanDialog.h"

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

/////////////////////////////////////////////////////////////////////////////
// CRanDialog dialog


CRanDialog::CRanDialog(CWnd* pParent /*=NULL*/)
	: CDialog(CRanDialog::IDD, pParent)
{
	//{{AFX_DATA_INIT(CRanDialog)
	//}}AFX_DATA_INIT
	m_times_around=0;
	m_raw_pool_ptr=0;
	m_max_times_around=4;
}

void CRanDialog::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CRanDialog)
	DDX_Control(pDX, IDC_PROGRESS, m_cProgress);
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CRanDialog, CDialog)
	//{{AFX_MSG_MAP(CRanDialog)
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONDOWN()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRanDialog message handlers

void CRanDialog::stir_it(unsigned int x)
{ // cycle around pool....
	m_raw_pool[m_raw_pool_ptr]^=(char)x;
	m_raw_pool_ptr++;
	if (m_raw_pool_ptr==_POOL_SIZE_) 
	{
		// Mininmum one klick ! 
		if ( m_times_around<m_max_times_around-1 )
		{
		  m_times_around++;
		}
		m_raw_pool_ptr=0;
	}
	m_cProgress.StepIt();
}


void CRanDialog::OnMouseMove(UINT nFlags, CPoint point) 
{
	if ( m_times_around>=m_max_times_around )
	{
		CDialog::OnOK();
	}else
	{
		LARGE_INTEGER large;
		unsigned int i;
		QueryPerformanceCounter(&large);
		i=(unsigned int)large.LowPart;
		stir_it(i);
		stir_it(i>>8);
		stir_it(i>>16);		// bottom 24 bits look good!
		stir_it((unsigned int)point.x);
		stir_it((unsigned int)point.y);
	}
	CDialog::OnMouseMove(nFlags, point);
}

BOOL CRanDialog::OnInitDialog() 
{
	CDialog::OnInitDialog();
	m_times_around=0;
	m_raw_pool_ptr=0;
	m_max_times_around=4;
	m_cProgress.SetRange(0,m_max_times_around*_POOL_SIZE_);
	m_cProgress.SetStep(1);
	return TRUE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}

void CRanDialog::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// Collect some entropy 
	LARGE_INTEGER large;
	unsigned int i;
	QueryPerformanceCounter(&large);
	i=(unsigned int)large.LowPart;
	stir_it(i);
	stir_it(i>>8);
	stir_it(i>>16);		// bottom 24 bits look good!
	stir_it((unsigned int)point.x);
	stir_it((unsigned int)point.y);
	
	// Hash the entire pool with SHA1. 
	MyCryptLib Cryptor;
	PBYTE pBuff=m_raw_pool;
	for(int j=0;j<_POOL_SIZE_/20;j++)
	{
		Cryptor.SHA1Hash(pBuff+j*20,m_raw_pool,_POOL_SIZE_);
	}	
	m_times_around++;
	m_cProgress.SetPos(m_times_around*_POOL_SIZE_);
	CDialog::OnLButtonDown(nFlags, point);
}

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

spinoza
Program Manager
Sweden Sweden
Amin Gholiha.
Education:
- Master of Science in Information Technology.
- Degree of Master of Education.
Knowledge/interest: programming (.NET,Visual, C#/C++), neural network, mathematical modeling, signal processing, sequence analysis, pattern recognition,robot technology, system design, security and business management systems. For business proposal email Gholiha@rocketmail.com, all other emails will be ignored.
Current Work:
Project Manager
www.easysoft.nu (the best free e-signature tool)

| Advertise | Privacy | Terms of Use | Mobile
Web01 | 2.8.150129.1 | Last Updated 21 Jun 2006
Article Copyright 2006 by spinoza
Everything else Copyright © CodeProject, 1999-2015
Layout: fixed | fluid