vc++实现文件加密解密

#include "stdafx.h"

#include "ecfile.h"

#include "ecfileDlg.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()

/

// CEcfileDlg dialog

CEcfileDlg::CEcfileDlg(CWnd* pParent /*=NULL*/)

 : CDialog(CEcfileDlg::IDD, pParent)

{

 //{{AFX_DATA_INIT(CEcfileDlg)

 m_path = _T("");

 m_pass = _T("");

 //}}AFX_DATA_INIT

 // Note that LoadIcon does not require a subsequent DestroyIcon in Win32

 m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);

}

void CEcfileDlg::DoDataExchange(CDataExchange* pDX)

{

 CDialog::DoDataExchange(pDX);

 //{{AFX_DATA_MAP(CEcfileDlg)

 DDX_Text(pDX, IDC_PASSWORD, m_path);

 DDX_Text(pDX, IDC_PASS1, m_pass);

 //}}AFX_DATA_MAP

}

BEGIN_MESSAGE_MAP(CEcfileDlg, CDialog)

 //{{AFX_MSG_MAP(CEcfileDlg)

 ON_WM_SYSCOMMAND()

 ON_WM_PAINT()

 ON_WM_QUERYDRAGICON()

 ON_BN_CLICKED(IDC_E, OnE)

 ON_BN_CLICKED(IDC_D, OnD)

 ON_BN_CLICKED(IDC_BROW, OnBrow)

 //}}AFX_MSG_MAP

END_MESSAGE_MAP()

BOOL CEcfileDlg::OnInitDialog()

{

 CDialog::OnInitDialog();

 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);

  }

 }

 SetIcon(m_hIcon, TRUE);

 SetIcon(m_hIcon, FALSE);

 return TRUE;

}

void CEcfileDlg::OnSysCommand(UINT nID, LPARAM lParam)

{

 if ((nID & 0xFFF0) == IDM_ABOUTBOX)

 {

  CAboutDlg dlgAbout;

  dlgAbout.DoModal();

 }

 else

 {

  CDialog::OnSysCommand(nID, lParam);

 }

}

void CEcfileDlg::OnPaint()

{

 CDialog::OnPaint();

}

HCURSOR CEcfileDlg::OnQueryDragIcon()

{

 return (HCURSOR) m_hIcon;

}

void CEcfileDlg::OnE()

{

 UpdateData(TRUE);

 if(m_path == "")

 {

  AfxMessageBox("怎么没有选择要加密的文件就开始加密啊?");

  return;

 }

 UpdateData(TRUE);

 if(m_pass == "")

 {

  AfxMessageBox("没有写上密码");

  return;

 }

 if(ecfile(m_path))

 {

  MessageBox("加密成功了已经");

 }

 else

 {

  MessageBox("没加密成功");

 }

}

void CEcfileDlg::OnD()

{

 UpdateData(TRUE);

 if(m_path == "")

 {

  AfxMessageBox("怎么没有选择要加密的文件就开始解密啊?");

  return;

 }

 UpdateData(TRUE);

 if(m_pass == "")

 {

  AfxMessageBox("没有写上密码");

  return;

 }

 if(dcfile(m_path))

 {

  MessageBox("解密成功了");

 }

 else

 {

  MessageBox("解密失败了");

 }

}

void CEcfileDlg::OnBrow()

{

 CFileDialog dlg(TRUE);

 if(dlg.DoModal() == IDOK)

 {

  m_path = dlg.GetPathName();

  UpdateData(FALSE);

 }

 else

 {

  return;

 }

}

//给文件加密的函数

BOOL CEcfileDlg::ecfile(LPCTSTR fpath)

{

 char *data;

 CFile *file;

 DWORD flen;

 m_password = epass();

 file = new CFile;

 if ( !file->Open(fpath, CFile::shareDenyNone|CFile::modeReadWrite))

 {

  return FALSE;

 }

 flen = file->GetLength();

 data = new char[(int)flen];

 file->SeekToBegin();

 file->Read(data, flen);

 for(int i=0; i<(int)flen; i++)

 {

  data[i] ^= m_password;

  data[i] ^= flen;

 }

 file->SeekToBegin();

 file->Write(data, flen);

 delete[] data;

 //添加密码验证信息

 char cpass[5] = "love";

 for(int j=0; j<5; j++)

 {

  cpass[j] ^= m_password;

 }

 file->SeekToEnd();

 file->Write(&cpass, 5);

 file->Close();

 delete file;

 return TRUE;

}

//给文件解密的函数

BOOL CEcfileDlg::dcfile(LPCTSTR fpath)

{

 char *data;

 CFile *file;

 DWORD flen;

 char love[5];

 file = new CFile;

 if( !file->Open(fpath, CFile::shareDenyNone|CFile::modeReadWrite))

 {

  return FALSE;

 }

 flen = file->GetLength();

 data = new char[(int)flen];

 //检验密码是不是正确

 file->Seek(-5, CFile::end);

 file->Read(&love, 5);

 m_password = epass();

 for(int i=0; i<5; i++)

 {

  love[i] ^= m_password;

 }

 if(strcmp(love, "love")!=0)

 {

  return FALSE;

 }

 //解密

 file->SeekToBegin();

 file->Read(data, flen);

 for(int j=0; j<(int)flen; j++)

 {

  data[j] ^= m_password;

  data[j] ^= (flen-5);

 }

 file->SeekToBegin();

 file->Write(data, flen);

 file->SetLength(flen-5);

 file->Close();

 delete[] data;

 delete file;

 return TRUE;

}

//获得密码的函数

__int64 CEcfileDlg::epass()

{

 DWORD plen;

 char *ppass;

 __int64 mc= 8757735233305;

 UpdateData(TRUE);

 ppass = m_pass.GetBuffer(0);

 plen = strlen(ppass);

 for(int i=0; i<(int)plen; i++)

 {

  mc ^= ppass[i]|128;

 }