readwatermarkdlg.cpp

使用openssl的RSA算法对文字加密

// ReadWaterMarkDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ReadWaterMark.h"
#include "ReadWaterMarkDlg.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <openssl/rsa.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#pragma	comment(lib, "libeay32")
#include <openssl/applink.c>

#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()

/////////////////////////////////////////////////////////////////////////////
// CReadWaterMarkDlg dialog

CReadWaterMarkDlg::CReadWaterMarkDlg(CWnd* pParent /*=NULL*/)
: CDialog(CReadWaterMarkDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CReadWaterMarkDlg)
	m_WaterMarkFile = _T("");
	m_MyKey = _T("");
	m_WaterInfo = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CReadWaterMarkDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CReadWaterMarkDlg)
	DDX_Text(pDX, IDC_EDIT1, m_WaterMarkFile);
	DDX_Text(pDX, IDC_EDIT2, m_MyKey);
	DDX_Text(pDX, IDC_EDIT3, m_WaterInfo);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CReadWaterMarkDlg, CDialog)
//{{AFX_MSG_MAP(CReadWaterMarkDlg)
ON_WM_SYSCOMMAND()
ON_WM_PAINT()
ON_WM_QUERYDRAGICON()
ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
ON_BN_CLICKED(IDC_BUTTON3, OnButton3)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CReadWaterMarkDlg message handlers

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

//DEL void CReadWaterMarkDlg::OnOK() 
//DEL {
//DEL 	// TODO: Add extra validation here
//DEL 	
//DEL 	CDialog::OnOK();
//DEL }

void CReadWaterMarkDlg::OnCancel() 
{
	// TODO: Add extra cleanup here
	
	CDialog::OnCancel();
}

void CReadWaterMarkDlg::OnButton1() 
{
	// TODO: Add your control notification handler code here
	CFileDialog m_FileOpenDialog(TRUE,NULL,NULL,OFN_HIDEREADONLY,"支持的所有文件(*.EXE;*.DLL;*.OCX)|*.EXE;*.DLL;*.OCX;|可执行程序(*.EXE)|*.EXE|动态链接库(*.DLL)|*.DLL|ActiveX控件(*.OCX)|*.OCX||");
	m_FileOpenDialog.DoModal();
	m_WaterMarkFile= m_FileOpenDialog.GetPathName();
	if(m_WaterMarkFile== "") 
		return;
    UpdateData(FALSE);
}

void CReadWaterMarkDlg::OnButton2() 
{
	// TODO: Add your control notification handler code here
	CFileDialog m_FileOpenDialog(TRUE,NULL,NULL,OFN_HIDEREADONLY,"支持的所有文件(*.*)|*.*");
	m_FileOpenDialog.DoModal();
	m_MyKey= m_FileOpenDialog.GetPathName();
	if(m_MyKey== "") 
		return;
    UpdateData(FALSE);
}

void CReadWaterMarkDlg::OnButton3() 
{
	// TODO: Add your control notification handler code here
	int count;
	RSA *key;
	
	unsigned char buffer[128];
	FILE *prifd, *ciphfd;
	   unsigned char *tmp;
	   int tmplen,plainlen;
	   
	  
	   
	   prifd=fopen(m_MyKey,"rb");
	   if(!prifd)
	   {
		   m_WaterInfo="打开密钥文件失败";
		   UpdateData(FALSE);
		   return ;
		   
	   }
	   
	   if(NULL==(key=PEM_read_RSAPrivateKey(prifd,NULL,NULL,NULL)))
	   {
		   m_WaterInfo="读取密钥失败";
		   UpdateData(FALSE);
		   fclose(prifd);
		   return ;
	   }
	   
	   ciphfd=fopen(m_WaterMarkFile,"rb+");;
	   if(!ciphfd)
	   {
		   m_WaterInfo="读取文件失败";
		   UpdateData(FALSE);
		   RSA_free(key);
		   fclose(prifd);
		   return ;
	   }
	   fseek(ciphfd,-128L,2);
	   count = fread( buffer, 1, 128, ciphfd);
	   if( ferror(ciphfd) )      
	   { 
		   m_WaterInfo="读取加密水印失败";
		   UpdateData(FALSE);
		   RSA_free(key);
		   fclose(ciphfd);
		   fclose(prifd);
		   return ;
	   }
	   
	   
	      tmplen=128;
          tmp=(unsigned char*) malloc(tmplen);
          if(!tmp)
		  {
			  m_WaterInfo="分配内存失败";
			  UpdateData(FALSE);
			  RSA_free(key);    
			  fclose(prifd);
			  fclose(ciphfd);
			  return ;
		  }
		  if(-1==(plainlen=RSA_private_decrypt(count,buffer,tmp,key,RSA_PKCS1_PADDING)))
		  {
			  m_WaterInfo="提取水印失败";
			  UpdateData(FALSE);
			  free(tmp);
			  RSA_free(key);
			  fclose(prifd);
			  fclose(ciphfd);
			  return ;
		  }
          unsigned char *plaintext;
		  plaintext=(unsigned char*) malloc(plainlen);
		  for(int i=0;i<plainlen;i++)
          plaintext[i]=tmp[i];
		  m_WaterInfo=plaintext;
		  free(plaintext);
		   
          RSA_free(key);
          free(tmp);
		  fclose(prifd);
		  fclose(ciphfd);
		  UpdateData(FALSE);
}