ecfiledlg.cpp

WINCE界面

// ECFileDlg.cpp : implementation file
//

#include "stdafx.h"
#include "LCDemo.h"
#include "ECFileDlg.h"


// CECFileDlg dialog

IMPLEMENT_DYNAMIC(CECFileDlg, CDialog)

CECFileDlg::CECFileDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CECFileDlg::IDD, pParent)
	, m_path(_T(""))
	, m_pass(_T(""))
{

}

CECFileDlg::~CECFileDlg()
{
}

void CECFileDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	DDX_Text(pDX, IDC_PASSWORD, m_path);
	DDX_Text(pDX, IDC_PASS1, m_pass);
}


BEGIN_MESSAGE_MAP(CECFileDlg, CDialog)
	ON_BN_CLICKED(IDC_EXIT, &CECFileDlg::OnBnClickedExit)
	ON_BN_CLICKED(IDC_D, &CECFileDlg::OnBnClickedD)
	ON_BN_CLICKED(IDC_E, &CECFileDlg::OnBnClickedE)
	ON_BN_CLICKED(IDC_BROW, &CECFileDlg::OnBnClickedBrow)
	ON_EN_CHANGE(IDC_PASSWORD, &CECFileDlg::OnEnChangePassword)
END_MESSAGE_MAP()


// CECFileDlg message handlers



void CECFileDlg::OnBnClickedD()
{
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);
	if(m_path == _T(""))
	{
		AfxMessageBox(_T("未选择已加密的文件，无法解密！"));
		return;
	}

	UpdateData(TRUE);
	if(m_pass == _T(""))
	{
		AfxMessageBox(_T("密码不能为空！"));
		return;
	}

	if(dcfile(m_path))
	{
		MessageBox(_T("解密成功"));
	}
	else
	{
		MessageBox(_T("解密失败"));
	}
}

void CECFileDlg::OnBnClickedE()
{
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);
	if(m_path == "")
	{
		AfxMessageBox(_T("未选择要加密的文件，无法加密！"));
		return;
	}

	UpdateData(TRUE);
	if(m_pass == _T(""))
	{
		AfxMessageBox(_T("密码不能为空！"));
		return;
	}


	if(ecfile(m_path))
	{
		MessageBox(_T("加密成功"));
	}
	else
	{
		MessageBox(_T("加密失败"));
	}
}

void CECFileDlg::OnBnClickedExit()
{
	// TODO: Add your control notification handler code here
}

void CECFileDlg::OnBnClickedBrow()
{
	// TODO: Add your control notification handler code here
	CFileDialog dlg(TRUE);
	if(dlg.DoModal() == IDOK)
	{
		m_path = dlg.GetPathName();
		UpdateData(FALSE);
	}
	else
	{
		return;
	}
}

void CECFileDlg::OnEnChangePassword()
{
	// TODO:  If this is a RICHEDIT control, the control will not
	// send this notification unless you override the CDialog::OnInitDialog()
	// function and call CRichEditCtrl().SetEventMask()
	// with the ENM_CHANGE flag ORed into the mask.

	// TODO:  Add your control notification handler code here
}



//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;
	TCHAR *ppass;
	__int64 mc= 8757735233305;
	UpdateData(TRUE);

	ppass = m_pass.GetBuffer(0);

	plen = _tcslen(ppass);

	for(int i=0; i<(int)plen; i++)
	{
		mc ^= ppass[i]|128;
	}
	return mc;
}