加密算法

#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

__int CEcfileDlg::epass() {

DWORD plen; char *ppass;

__int 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; }