rc4dlg.cpp

这是关于RC4加密算法的代码 RC4是典型的流加密是对称加密算法

// RC4Dlg.cpp : implementation file
//

#include "stdafx.h"
#include "RC4.h"
#include "RC4Dlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();
	
	// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA
	
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL
	
	// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
//{{AFX_MSG_MAP(CAboutDlg)
// No message handlers
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRC4Dlg dialog

CRC4Dlg::CRC4Dlg(CWnd* pParent /*=NULL*/)
: CDialog(CRC4Dlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CRC4Dlg)
	m_Skey = _T("");
	m_Ss = _T("");
	m_St = _T("");
	m_Sps = _T("");
	m_Ssg = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CRC4Dlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CRC4Dlg)
	DDX_Text(pDX, IDC_EKey, m_Skey);
	DDV_MaxChars(pDX, m_Skey, 256);
	DDX_Text(pDX, IDC_EDIT2, m_Ss);
	DDX_Text(pDX, IDC_EDIT5, m_St);
	DDX_Text(pDX, IDC_EDIT3, m_Sps);
	DDX_Text(pDX, IDC_EDIT4, m_Ssg);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CRC4Dlg, CDialog)
//{{AFX_MSG_MAP(CRC4Dlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDOK, Generate)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRC4Dlg message handlers

BOOL CRC4Dlg::OnInitDialog()
{
	CDialog::OnInitDialog();
	
	// Add "About..." menu item to system menu.
	
	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);
	
	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}
	
	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	memset(S,0,256);
	memset(K,0,256);
	CEdit *p=(CEdit *)this->GetDlgItem(IDC_EDIT2);
    CRect lprect(0,50,400,60);
	p->SetRect(&lprect);
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CRC4Dlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CRC4Dlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting
		
		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);
		
		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;
		
		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CRC4Dlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CRC4Dlg::RC4Init(unsigned char *Key,int Keylen)
{
    int i;	
	//填充线性S盒、同时使用KEY填充T盒
	for(i=0;i<256;i++)
	{
		S[i]=i;
        K[i]=Key[i % Keylen];
	}
	
	//控制显示
	int Line;
	for(i=0,Line=0;i<256;i++)
	{
		CString str;
		str.Format("%02X",S[i]);
		m_Ss+=str+" ";
		m_St+=K[i];
		m_St+=" ";
		if(++Line==16)
		{
			Line=0;
			m_Ss+="\r\n";
			m_St+="\r\n";
		}
	}
}

void CRC4Dlg::RC4InitPermutS(BYTE *S, BYTE *T)
{
	//for (i = 0 to i = 255)
	//j = (j + Si + ki) MOD 256
	//	Swap Si and Sj
	//fi
	int j=0; //初始索引值必须为0
	BYTE temp;
	for(int i=0;i<256;i++)
	{
		j=(j+S[i]+T[i]) % 256;
		
		temp=S[i];
		S[i]=S[j];
		S[j]=temp;
	}
	
	//显示区
	int k;
	for(i=0,k=0;i<256;i++)
	{
		CString str;
		str.Format("%02X",S[i]);
		m_Sps+=str+" ";
		if(++k==16)
		{
			k=0;
			m_Sps+="\r\n";
		}
	}
}

void CRC4Dlg::StreamGeneration(BYTE *S)
{

#define RandNum       16384
	//i = (i + 1) MOD 256
	//j = (j + Si) MOD 256
	//Swap Si and Sj
	//t = (Si + Sj) MOD 256
	//K = St
	int jj;
	int i=0;
	int j=0;
	int t;
    BYTE K[RandNum];
	for(jj=0;jj<RandNum;jj++)
	{
		i=(i+1) % 256;
		j=(j+S[i])%256;		
		//j=(j+1) % 256;
		BYTE temp;
		temp=S[i];
		S[i]=S[j];
		S[j]=temp;
		t=(S[i] + S[j]) % 256;
		K[jj]=S[t];
	}
	
	//显示区
	int line;
	for(jj=0,line=0;jj<RandNum;jj++)
	{
		CString str;
		str.Format("%02X",K[jj]);
		m_Ssg+=str+" ";
		if(++line==16)
		{
			line=0;
			m_Ssg+="\r\n";
		}
	}
}



void CRC4Dlg::Generate() 
{
	// TODO: Add your control notification handler code here
	this->UpdateData(true);
	m_Sps.Empty();
	m_Ss.Empty();
	m_Ssg.Empty();
	m_St.Empty();
	
	int len;
	len=m_Skey.GetLength();
	if(len==0)
	{
		AfxMessageBox("请输入密钥！",MB_OK|MB_ICONINFORMATION);
		return;
	}
	
    unsigned char *key = (unsigned   char*)(LPCTSTR)m_Skey;
	
    
	RC4Init(key,len);
	
	RC4InitPermutS(S,K);
	
	StreamGeneration(S);
	
	
    this->UpdateData(false);
}