rsadlg.cpp

本代码实现基于RSA算法的文本加密解密功能

// RSADlg.cpp : implementation file
//

#include "stdafx.h"
#include "RSA.h"
#include "RSADlg.h"
#include "fstream.h"
#include "math.h"

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

/////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////设置密钥
 int   n1,d,c;
 int   p=3;
 int   q=43;
 int   e=11;
 int   n=p*q;
 int   j=0,count=0,k;
 int   r[200];
/////////////////////////////////////////////////////////////////////////////
// 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()

/////////////////////////////////////////////////////////////////////////////
// CRSADlg dialog

CRSADlg::CRSADlg(CWnd* pParent /*=NULL*/)
	: CDialog(CRSADlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CRSADlg)
	m_file1 = _T("e:\\RSA\\t1.txt");
	m_file2 = _T("e:\\RSA\\t2.txt");
	m_file3 = _T("e:\\RSA\\t2.txt");
	m_file4 = _T("e:\\RSA\\t3.txt");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CRSADlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CRSADlg)
	DDX_Text(pDX, IDC_EDIT1, m_file1);
	DDX_Text(pDX, IDC_EDIT2, m_file2);
	DDX_Text(pDX, IDC_EDIT3, m_file3);
	DDX_Text(pDX, IDC_EDIT4, m_file4);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CRSADlg, CDialog)
	//{{AFX_MSG_MAP(CRSADlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON_key, OnBUTTON_key)
	ON_BN_CLICKED(IDC_BUTTON_Encryption, OnBUTTON_Encryption)
	ON_BN_CLICKED(IDC_BUTTON_Decryption, OnBUTTON_Decryption)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRSADlg message handlers

BOOL CRSADlg::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 CRSADlg::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 CRSADlg::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 CRSADlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CRSADlg::OnBUTTON_key() 
{
	d=1;
	n1=(p-1)*(q-1);
    c=e*d%n1;
	while(c!=1)
	{	
		d++;
		c=e*d%n1;
	}
	MessageBox(" 计算完成!");	
// TODO: Add your control notification handler code here
	
}

void CRSADlg::OnBUTTON_Encryption() 
{
	UpdateData(TRUE);
	char ch ;
    int num;
    ifstream infile(m_file1);
    ofstream outfile(m_file2);
	infile.unsetf(ios::skipws);
	while(infile>>ch)
	{
		++j;
		num=ch;
		ch=Encryption(num);
		outfile<<ch;
	}
	infile.close();
	outfile.close();
	MessageBox(" 加密完成!");// TODO: Add your control notification handler code here
	
}

void CRSADlg::OnBUTTON_Decryption() 
{
	UpdateData(TRUE);
    char ch;
	int num;
	j=0;
    ifstream infile(m_file3);
    ofstream outfile(m_file4);
	infile.unsetf(ios::skipws);
	while(infile>>ch)
	{
		++j;
		num=ch;
		ch=Decryption(num);
		outfile<<ch;
	}
	infile.close();
	outfile.close();
	MessageBox(" 解密完成!");
	j=0;
	count=0;
	k=0;// TODO: Add your control notification handler code here
	
}

int CRSADlg::Encryption(int a)
{   
	int z;
	z=Remainder(a,e,n);//////////////////////
	if(z==26)
	{
		r[k]=j;
		k++;
		count++;
		z=z+30;
	}
	return z;
}
///////////////////////////////////////////
int CRSADlg::Decryption(int a)
{
	int z=a;
	int i=0;
	i=0;
	if(z==56)	
		for(i=0;i<count;i++)
			if(j==r[i])z=z-30;
	return Remainder(z,d,n);
}

int CRSADlg::Remainder(int W,int nn,int G)
{
	int i=0,k,m,t,R;
	double M,AA=1;
	do{
		do{
			i++;
			M=pow((double)W,(double)i);
		}while(M<(double)G);

		k=i;
		i=0;
		t=nn;

		if(t>=k)
		{
			m=nn%k;
			nn=nn/k;
			AA=AA*pow((double)W,(double)m);
			W=(int)fmod(M,(double)G);
		}
	if(W==1||W==0)break;
	}while(t>=k);
	if(W==0)R=0;
	else
	{
		M=AA*pow((double)W,(double)nn);
		R=(int)fmod(M,(double)G);
	}
	return R;
}