eucinvdlg.cpp

用扩展欧拉法求逆元 rsa算法的必须组成函数模块 带对话框

// EUCINVDlg.cpp : implementation file
//


#include "stdafx.h"
#include "EUCINV.h"
#include "EUCINVDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CEUCINVDlg dialog

CEUCINVDlg::CEUCINVDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CEUCINVDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CEUCINVDlg)
	m_a = _T("");
	m_m = _T("");
	m_i = _T("");
	m_gcd = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CEUCINVDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CEUCINVDlg)
	DDX_Text(pDX, IDC_A, m_a);
	DDX_Text(pDX, IDC_M, m_m);
	DDX_Text(pDX, IDC_I, m_i);
	DDX_Text(pDX, IDC_GCD, m_gcd);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CEUCINVDlg, CDialog)
	//{{AFX_MSG_MAP(CEUCINVDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEUCINVDlg message handlers

BOOL CEUCINVDlg::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
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CEUCINVDlg::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 CEUCINVDlg::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 CEUCINVDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CEUCINVDlg::OnButton1() 
{
	// TODO: Add your control notification handler code here
	int a=GetDlgItemInt(IDC_A);
	int n=GetDlgItemInt(IDC_M);
	int inverse, nextEuc_n, tempInv, remainder, quotient;
	int gcdInvOutArr[2]={0,0};                  //gcdInvOutArr[0]是gcd
      //运算对象做零检查，存在零则无逆元，但存在最大公约数
    if (a==0)                       
      {
        if (n==0)
          {
            gcdInvOutArr[0]=0;
            gcdInvOutArr[1]=0;
            //return gcdInvOutArr;
          }
        else
          {
           gcdInvOutArr[0]=n;
           gcdInvOutArr[1]=0;
            //return gcdInvOutArr;
          }
      }
    else
      {
        if (n==0)
          {
           gcdInvOutArr[0]=a;
           gcdInvOutArr[1]=0;
            //return gcdInvOutArr;
          }
      }
   //变量初始化
    gcdInvOutArr[0]=a;
    nextEuc_n=n;
    inverse=0;
    tempInv=1;
   //  通过带余除法逐次计算出最大公约数remainder和逆元inverse
    do
      {
      	//计算商和余数
       quotient=gcdInvOutArr[0]/nextEuc_n;
       remainder=gcdInvOutArr[0]%nextEuc_n;

        if (remainder>0)   //余数大于0
          {
          	//根据商累计乘法逆
            quotient=(inverse*quotient)%n;
            quotient=(tempInv-quotient)%n;
            tempInv=inverse;
            inverse=quotient;
            //为下次循环作变量初始化
            gcdInvOutArr[0]=nextEuc_n;
            nextEuc_n=remainder;
          }
      }
    while (remainder>0);                 //余数是否大于0，否，则退出循环

     gcdInvOutArr[0]=nextEuc_n;
    if (gcdInvOutArr[0]==1)                   //如果最大公约数=1
      {
       gcdInvOutArr[1]=inverse;
       if (gcdInvOutArr[1]<0)
         gcdInvOutArr[1]=gcdInvOutArr[1]+n;           
      }
    else                             //否则，无逆元，赋于0
      {
       gcdInvOutArr[1]=0;
      }

	
	SetDlgItemInt(IDC_GCD,gcdInvOutArr[0]);
	SetDlgItemInt(IDC_I,gcdInvOutArr[1]);
	
}

void CEUCINVDlg::OnButton2() 
{
	// TODO: Add your control notification handler code here
	SetDlgItemText(IDC_A,NULL);
	SetDlgItemText(IDC_M,NULL);
	SetDlgItemText(IDC_GCD,NULL);
	SetDlgItemText(IDC_I,NULL);
}