edstardlg.cpp

徐景周写的文件加解密

// EDstarDlg.cpp : implementation file
//
//功能：通用文件加解密
// 作者：徐景周 　
//日期：2001年7月18日
//
#include "stdafx.h"
#include "EDstar.h"
#include "EDstarDlg.h"
#include "DirDialog.h" //目录浏览对话框

#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 };
	CWBButton	m_OK;
	//}}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)
	virtual BOOL OnInitDialog();
	//}}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)
	DDX_Control(pDX, IDOK, m_OK);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEDstarDlg dialog

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

void CEDstarDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CEDstarDlg)
	DDX_Control(pDX, IDC_PASSWORD, m_Password1);
	DDX_Control(pDX, IDC_PATH1, m_SourcePath1);
	DDX_Control(pDX, IDC_PATH2, m_TargetPath1);
	DDX_Control(pDX, IDCANCEL, m_Cancel);
	DDX_Control(pDX, IDC_ENCRYPT, m_Encrypt);
	DDX_Control(pDX, IDC_DECRYPT, m_Decrypt);
	DDX_Control(pDX, IDC_BROWSE2, m_Browse2);
	DDX_Control(pDX, IDC_BROWSE1, m_Browse1);
	DDX_Text(pDX, IDC_PATH1, m_SourcePath);
	DDX_Text(pDX, IDC_PATH2, m_TargetPath);
	DDX_Text(pDX, IDC_PASSWORD, m_Password);
	DDV_MaxChars(pDX, m_Password, 16);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CEDstarDlg, CDialog)
	//{{AFX_MSG_MAP(CEDstarDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BROWSE1, OnBrowse1)
	ON_BN_CLICKED(IDC_BROWSE2, OnBrowse2)
	ON_BN_CLICKED(IDC_ENCRYPT, OnEncrypt)
	ON_BN_CLICKED(IDC_DECRYPT, OnDecrypt)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEDstarDlg message handlers

BOOL CEDstarDlg::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
	
	//把两个文件选择路径的静态框，设置内部显示方式为,
	//在显示长路径名时，省略中间路径，只显示两边路径。
    m_SourcePath1.SubclassDlgItem (IDC_PATH1, this);
	m_SourcePath1.SetPath (TRUE);
    m_TargetPath1.SubclassDlgItem (IDC_PATH2, this);
    m_TargetPath1.SetPath (TRUE);

	//设置位图按钮
	m_Browse1.LoadBitmaps(IDB_BITMAP2,6, 1, 1, 1, 1 );
	m_Browse1.SetFontColor(RGB(240,200,90));
	m_Browse2.LoadBitmaps(IDB_BITMAP2,6, 1, 1, 1, 1 );
	m_Browse2.SetFontColor(RGB(240,200,90));
	m_Encrypt.LoadBitmaps(IDB_BITMAP1,5, 5, 5, 5, 4 );
	m_Decrypt.LoadBitmaps(IDB_BITMAP1,5, 5, 5, 5, 4 );
	m_Cancel.LoadBitmaps(IDB_BITMAP1,5, 5, 5, 5, 4 );
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

BOOL CAboutDlg::OnInitDialog() 
{
	CDialog::OnInitDialog();
	
    //设置关于对话框中的位图按钮
	m_OK.LoadBitmaps(IDB_BITMAP1,5, 5, 5, 5, 4 );
	
	return TRUE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}

//加密文件算法涵数
BOOL CEDstarDlg::EncryptFile(CString filename,char *password)
{
	SetFileAttributes(filename,FILE_ATTRIBUTE_ARCHIVE|FILE_ATTRIBUTE_NORMAL);
	CFile m_file;
	if(m_file.Open(filename,CFile::modeReadWrite|CFile::typeBinary))
	{
		char m_buffer[3001];		
		m_file.Read(m_buffer,3000);
		//判断文件头八个字符是否为指定字符，
		//是的话，则是加密过的，不用再加密了。
		if(strncmp(m_buffer,"加密之星",8)==0)
		{
			m_file.Close();
			return false;
		}
	
		//取头3000字节按位于密码相与,
		//并将其存于文件的未尾处。
		int m_len=strlen(password);
		for(int i=0;i<3000;i++)
			m_buffer[i]^=password[i%m_len];
		m_len=m_file.GetLength();		
		m_file.SeekToEnd();
		m_file.Write(m_buffer,3000);

        //在加密后的文件开头处设置一特征字符串,
		//并将其它一些重要特征字符于一固定字符
		//串PW相与后,再将其存入文件开头处。
		memset(m_buffer,0,3001);
		strcpy(m_buffer,"加密之星");
		int *data=(int *)&m_buffer[8];
		data[0]=m_len;
		data[1]=strlen(password);
		strcpy((char *)&m_buffer[2*sizeof(int)+8],password);
		int temp=(2*sizeof(int)+8)+strlen(password);
		char * PW="xujingzhou";
		int m_PWlen=strlen(PW);
		for(int j=8;j<= temp;j++)
			m_buffer[j]^=PW[j%m_PWlen];
		m_file.SeekToBegin();
		if(m_len<3000)		
			m_file.Write(m_buffer,m_len);
		else
		    m_file.Write(m_buffer,3000);

		m_file.Close();
		
		return true;
	}
	return false;
}

//解密文件算法涵数
BOOL CEDstarDlg::DecryptFile(CString filename,char *password)
{
	SetFileAttributes(filename,FILE_ATTRIBUTE_ARCHIVE|FILE_ATTRIBUTE_NORMAL);
 
	CFile m_file;
	if(m_file.Open(filename,CFile::modeReadWrite|CFile::typeBinary))
	{
		char m_buffer[3001];		
		memset(m_buffer,0,3001);
		m_file.Read(m_buffer,3000);
		//判断文件头八个字符是否为加密后指定特征字
		//符串，是的话，则是加密过的，可以解密了，
		//否则就不能解密。
		if(strncmp(m_buffer,"加密之星",8)!=0)
		{
			m_file.Close();
			return FALSE;
		}
		//计算出特征字后其它一些重要字节的长度，
        //并将其解密后，与指定密码比较，判断是
        // 否相同。
		int temp=(2*sizeof(int)+8)+strlen(password);
		char * PW="xujingzhou";
		int m_PWlen=strlen(PW);
        for(int j=8;j<=temp;j++)
			m_buffer[j]^=PW[j%m_PWlen];
		int *data=(int *)&m_buffer[8];
		int m_len=data[1];
		if((m_len!=(int)strlen(password)) || (strcmp((char *)&m_buffer[8+2*sizeof(int)],password)!=0))
		{
			m_file.Close();
			return FALSE;
		}

		//从加密后的文件未尾处取出3000字节，
		//将解密后，重写入文件开头处既可。
		m_len=data[0];
		long m_pos=m_file.Seek(-3000,CFile::end);
		int  m_number=m_file.Read(m_buffer,3000);
		int  m_passlen=strlen(password);
		for(int i=0;i<3000;i++)
			m_buffer[i]^=password[i%m_passlen];
		m_file.SeekToBegin();
		m_file.Write(m_buffer,3000);
		m_file.SetLength(m_len);
		m_file.Close();

		return TRUE;
	}
	return FALSE;
}

//显示选择加解密文件对话框
void CEDstarDlg::OnBrowse1() 
{
   	//设置对话框参数并显示
	static char BASED_CODE filter[] = _T("所有文件(*.*)|*.*||");

	CFileDialog dlg(TRUE,
					NULL, 
					NULL, 
					OFN_HIDEREADONLY	| 
					OFN_OVERWRITEPROMPT | 
					OFN_FILEMUSTEXIST,
					filter,
					0);

	//得到加解密的源文件给m_SourcePath
	//并显示它到对话框的相应路径框中　
	if (dlg.DoModal() == IDOK) {
		m_SourcePath = dlg.GetPathName();
		m_Filename=dlg.GetFileName ();
	    UpdateData(FALSE);
	}
	
}

//显示选择加解密后保存路径对话框
void CEDstarDlg::OnBrowse2() 
{
    CDirDialog	dlg;
	if (dlg.DoBrowse(this) == IDOK) {
		//得到目标路径给m_TargetPath
		//并显示它到对话框的相应路径框中　
		m_TargetPath = dlg.m_strPath;
		UpdateData(FALSE);
	}
	
}

//进行文件加密操作
void CEDstarDlg::OnEncrypt() 
{
    UpdateData(true); //将对话框中各控件值传给相应变量
	if(m_SourcePath == "" || m_TargetPath == "" || m_Password == "")
	{
		MessageBox("请先选择加密文件和加密后的保存路径，\n然后设置加密密码既可！","提示");
		return ;
	}

	//将源文件复制到要保存的目标路径后，再进行加密操作
	CString tempPath;
    if(m_TargetPath.Right (1)=='\\')
       tempPath=m_TargetPath+m_Filename;
	else
       tempPath=m_TargetPath+'\\'+m_Filename;
	CopyFile(m_SourcePath,tempPath,false);

	if(EncryptFile(tempPath,m_Password.GetBuffer (0)))
	{
		MessageBox("文件加密成功！","提示");
		//清空相应变量值，以免连按加、解密按钮
       m_SourcePath = "";
	   m_Password ="";
       UpdateData(false); //将改变的变量值传给相应控件
	}
	else
	{
		MessageBox("文件加密失败！","提示");
		if(tempPath != m_SourcePath)
		   DeleteFile(tempPath);  //路径不同时，删除已复制文件
	}

}

//进行文件解密操作
void CEDstarDlg::OnDecrypt() 
{
	UpdateData(true); //将对话框中各控件值传给相应变量
    if(m_SourcePath == "" || m_TargetPath == "" || m_Password == "")
	{
		MessageBox("请先选择解密文件和解密后的保存路径，\n然后设置解密密码既可！","提示");
		return ;
	}
    
	//将源文件复制到要保存的目标路径后，再进行解密操作
	CString tempPath;
    if(m_TargetPath.Right (1)=='\\')
       tempPath=m_TargetPath+m_Filename;
	else
       tempPath=m_TargetPath+'\\'+m_Filename;
	CopyFile(m_SourcePath,tempPath,false);

	if(DecryptFile(tempPath,m_Password.GetBuffer (0)))
	{
		MessageBox("文件解密成功！","提示");
		//清空相应变量值，以免连按加、解密按钮
        m_SourcePath ="";
	    m_Password ="";
        UpdateData(false); //将改变的变量值传给相应控件
	}
	else
	{
		MessageBox("文件解密失败！","提示");
		if(tempPath != m_SourcePath)
		   DeleteFile(tempPath);  //路径不同时，删除已复制文件
	}

}