testdialogdlg.cpp

how to use MSCSP encrypt and decrypt

// TestDialogDlg.cpp : implementation file
//

#include "stdafx.h"
#include "TestDialog.h"
#include "TestDialogDlg.h"

#define ENCRYPT_ALGORITHM CALG_RC4 
#define ENCRYPT_BLOCK_SIZE 8 

#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()

/////////////////////////////////////////////////////////////////////////////
// CTestDialogDlg dialog

CTestDialogDlg::CTestDialogDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CTestDialogDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CTestDialogDlg)
	m_strEncryptingData = _T(""); 
	m_strDecryptingData = _T("");
	m_strPassword = _T("");
	m_strSignatingData = _T("");
	m_strPublicKey = _T("");
	m_strPrivateKey = _T("");
	m_strSignatedData = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}
CTestDialogDlg::~CTestDialogDlg()
{
	if(m_hCryptProv)
		CryptReleaseContext(m_hCryptProv, 0);
}
void CTestDialogDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CTestDialogDlg)
	DDX_Text(pDX, IDC_EDIT1, m_strEncryptingData);
	DDX_Text(pDX, IDC_EDIT2, m_strDecryptingData);
	DDX_Text(pDX, IDC_EDIT_TEMP, m_strPassword);
	DDX_Text(pDX, IDC_EDIT3, m_strSignatingData);
	DDX_Text(pDX, IDC_EDIT6, m_strSignatedData);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CTestDialogDlg, CDialog)
	//{{AFX_MSG_MAP(CTestDialogDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	ON_BN_CLICKED(IDC_BUTTON2, OnButton2)
	ON_EN_CHANGE(IDC_EDIT1, OnChangeEdit1)
	ON_EN_CHANGE(IDC_EDIT3, OnChangeEdit3)
	ON_BN_CLICKED(IDC_BUTTON3, OnButton3)
	ON_BN_CLICKED(IDC_BUTTON4, OnButton4)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CTestDialogDlg message handlers

BOOL CTestDialogDlg::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
	
	// TODO: Add extra initialization here
	UINT pControls[] = {IDC_EDIT1, IDC_EDIT_TEMP, IDC_EDIT2, 
		                IDC_EDIT3, IDC_EDIT6};
	EnableControls(pControls, sizeof(pControls)/sizeof(UINT), FALSE);

	EnableScreen(FALSE, TRUE);
	EnableScreen(FALSE, FALSE);

	m_hCryptProv = InitCryptProv(""); 
	if(m_hCryptProv == NULL)  InitCryptProv("", 0, CRYPT_NEWKEYSET); 
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

void CTestDialogDlg::OnButton1() 
{
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);
	HCRYPTKEY hKey = NULL;
	hKey = CreateSessionKey(m_strPassword, ENCRYPT_ALGORITHM, CRYPT_CREATE_SALT);
	BYTE* pbBuffer = EncryptData(hKey, m_strEncryptingData);
	m_strDecryptingData.Format("%s", pbBuffer);

	if(hKey)      CryptDestroyKey(hKey);
	m_strEncryptingData = _T("");
	UpdateData(FALSE);
}

void CTestDialogDlg::OnButton2() 
{
	// TODO: Add your control notification handler code here
	UpdateData(TRUE);
	HCRYPTKEY hKey = NULL;
	hKey = CreateSessionKey(m_strPassword, ENCRYPT_ALGORITHM, CRYPT_CREATE_SALT);
	BYTE* pbBuffer = DecryptData(hKey, m_strDecryptingData);
	m_strEncryptingData.Format("%s", pbBuffer);

	if(hKey)  CryptDestroyKey(hKey);
	m_strDecryptingData = _T("");
	UpdateData(FALSE);
}

void CTestDialogDlg::EnableScreen(BOOL blEncrypt, BOOL blIsSymmetry)
{
	UINT pControlFalse[] = {IDC_EDIT1};
	UINT pControlTrue[] = {IDC_EDIT1, IDC_EDIT_TEMP, IDC_EDIT2};

	UINT pControlF[] = {IDC_EDIT3};
	UINT pControlT[] = {IDC_EDIT6};

	int i = 0;
	if(blIsSymmetry)
	{
		if(blEncrypt)
		{
			EnableControls(pControlTrue, sizeof(pControlTrue)/sizeof(UINT), TRUE);
		}
		else
		{
			EnableControls(pControlFalse, sizeof(pControlFalse)/sizeof(UINT), TRUE);
		}
	}
	else
	{
		if(blEncrypt)
		{
			EnableControls(pControlT, sizeof(pControlT)/sizeof(UINT), TRUE);
		}
		else
		{
			EnableControls(pControlF, sizeof(pControlF)/sizeof(UINT), TRUE);
		}
	}
}

void CTestDialogDlg::EnableControls(UINT uArray[], UINT uSize, BOOL blEnable)
{
	for(UINT uIndex = 0; uIndex < uSize; uIndex++)
	{
		CWnd* pWnd = GetDlgItem(uArray[uIndex]);
		if(pWnd)  pWnd->EnableWindow(blEnable);
	}
}

void CTestDialogDlg::OnChangeEdit1() 
{
	// 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
	EnableScreen(TRUE, TRUE);
}

HCRYPTPROV CTestDialogDlg::InitCryptProv(CString strCSPName, DWORD dwCSPType/*=PROV_RSA_FULL*/, DWORD dwFlags/*=0*/)
{
	HCRYPTPROV hCryptProv = NULL;
	TRY
	{
		CryptAcquireContext(
			&hCryptProv, 
			NULL, 
			strCSPName, 
			dwCSPType, 
			dwFlags);//创建密钥容器
	}
	CATCH(CException, e) {
		e->ReportError();
		return NULL;
	} END_CATCH

	return hCryptProv;
}

HCRYPTKEY CTestDialogDlg::CreateSessionKey(CString strPasswords, UINT AlgID, DWORD dwFlag)
{
	HCRYPTKEY hKey = NULL;
	HCRYPTHASH hHash; 

	char* pzPasswords = (LPTSTR)(LPCTSTR)strPasswords;

	// Create a hash object. 
	if(!CryptCreateHash(
		m_hCryptProv, 
		CALG_MD5, 
		0, 
		0, 
		&hHash))
	{
		MessageBox("Cannot create a Hash table.");
		return NULL;
	}

	//--------------------------------------------------------------------
	// create a hash deque with the input passwords
	if(!CryptHashData(
		hHash, 
		(BYTE *)pzPasswords, 
		strlen(pzPasswords), 
		0))
	{
		MessageBox("Cannot create hash deque with the passwords.");
		return NULL;
	}

	//--------------------------------------------------------------------
	// Gernerate a session key with the hash deque
	if(!CryptDeriveKey(
		m_hCryptProv, 
		AlgID,//ENCRYPT_ALGORITHM, 
		hHash, 
		dwFlag,//KEYLENGTH, 
		&hKey))
	{
		MessageBox("Cannot Gernerate a session key.");
		return NULL;
	}
	//--------------------------------------------------------------------
	// Destroy the hash object. 
	if(hHash)
		CryptDestroyHash(hHash); 
	hHash = NULL; 

	return hKey;
}

BYTE* CTestDialogDlg::EncryptData(HCRYPTKEY hKey, CString strEncrypting)
{
	//Create the session key
//	char* pzPasswords = (LPTSTR)(LPCTSTR)m_strPasswords;
//	HCRYPTKEY hKey = NULL;
//	hKey = CreateSessionKey(pzPasswords, ENCRYPT_ALGORITHM, CRYPT_CREATE_SALT);

	BYTE* pbBuffer;
	DWORD dwBufferLen = 0;
	DWORD dwCount;
	DWORD dwBlockLen = 1000 - 1000 % ENCRYPT_BLOCK_SIZE;
	//--------------------------------------------------------------------
	// Determine the block size. If a block cipher is used, 
	// it must have room for an extra block. 	
	if(ENCRYPT_BLOCK_SIZE > 1) 
		dwBufferLen = dwBlockLen + ENCRYPT_BLOCK_SIZE; 
	else 
		dwBufferLen = dwBlockLen; 
	
	// Allocate memory. 
	pbBuffer = (BYTE *)malloc(dwBufferLen);
	if(NULL == pbBuffer)