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Posted 14 Jun 2006

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.
// SecureChatClientDlg.h : header file

#if !defined(AFX_SECURECHATCLIENTDLG_H__A72696A9_0551_491B_9D94_A4A16F3DBF5E__INCLUDED_)

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

// CSecureChatClientDlg dialog

#include "../SecureChatIOCP.h" // The IOCP protocol 
#include "../HistoryEdit.h" // Log ctrl. 
#include "../RanDialog.h" // Random dialog (for collecting entropy) 

class CSecureChatClientDlg : public CDialog

	// Message Handler from Server
	LRESULT OnClientDisconnected(WPARAM wParam, LPARAM lParam);
	LRESULT OnNewClient(WPARAM wParam, LPARAM lParam);
	LRESULT OnAppendLog(WPARAM wParam, LPARAM lParam);
	// Public key P
	DWORD* m_pPublicKey;
	UINT  m_nSizePublicKey;
	// The random dialog used to generate entropy. 
	CRanDialog m_RandomDlg;  

	// wrapper for connect thread. 
	static UINT ThreadWrapperConnect(LPVOID pParam);
	// Used with ThreadWrapperConnect to make a connection and public key.
	void MakeConnection();
	// Changes the GUI to reflect different mode. 
	void SetGuiConnectedMode(BOOL bConnected=TRUE);
	// Helper Function
	inline void  EnableCtrl(int nCtrlID,BOOL bShow);
	CSecureChatClientDlg(CWnd* pParent = NULL);	// standard constructor

// Dialog Data
	CButton	m_cBtnConnect;
	CHistoryEdit	m_cLogg;
	CString	m_sIP;
	CString	m_sMessage;
	CString	m_sName;
	UINT	m_nKeySize;
	UINT	m_nPort;
	BOOL	m_bUseSavedPubKey;

	// ClassWizard generated virtual function overrides
	virtual void DoDataExchange(CDataExchange* pDX);	// DDX/DDV support

// Implementation
	HICON m_hIcon;
	SecureChatIOCP m_iocp;

	// Generated message map functions
	virtual BOOL OnInitDialog();
	afx_msg void OnPaint();
	afx_msg HCURSOR OnQueryDragIcon();
	virtual void OnOK();
	afx_msg void OnDestroy();
	afx_msg void OnConnect();
	afx_msg void OnSend();
	afx_msg void OnClearwindow();

// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_SECURECHATCLIENTDLG_H__A72696A9_0551_491B_9D94_A4A16F3DBF5E__INCLUDED_)

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About the Author

Program Manager
Sweden Sweden
Amin Gholiha.
- 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, all other emails will be ignored.
Current Work:
Project Manager (the best free e-signature tool)

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