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_FILEstatic 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

// Implementationprotected: //{{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_MAPEND_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_MAPEND_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; } return mc;}