rsadecrypdlg.cpp

rsa算法的c++实现,该程序实现利用私钥解密

// RSAdecrypDlg.cpp : implementation file
//

#include "stdafx.h"
#include "RSAdecryp.h"
#include "RSAdecrypDlg.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()

/////////////////////////////////////////////////////////////////////////////
// CRSAdecrypDlg dialog

CRSAdecrypDlg::CRSAdecrypDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CRSAdecrypDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CRSAdecrypDlg)
	m_saveplain = _T("");
	m_loadciphertext = _T("");
	m_loadprvkey = _T("");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CRSAdecrypDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CRSAdecrypDlg)
	DDX_Text(pDX, IDC_EDIT3, m_saveplain);
	DDX_Text(pDX, IDC_EDIT2, m_loadciphertext);
	DDX_Text(pDX, IDC_EDIT1, m_loadprvkey);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CRSAdecrypDlg, CDialog)
	//{{AFX_MSG_MAP(CRSAdecrypDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_LoadPrikey, OnLoadPrikey)
	ON_BN_CLICKED(IDC_LoadCipher, OnLoadCipher)
	ON_BN_CLICKED(IDC_LoadCipher2, OnLoadCipher2)
	ON_BN_CLICKED(IDC_Decrypt, OnDecrypt)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CRSAdecrypDlg message handlers

BOOL CRSAdecrypDlg::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
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

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

void CRSAdecrypDlg::OnLoadPrikey() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	CFileDialog fileDlg(TRUE);
 	fileDlg.m_ofn.lpstrTitle="导入私钥";
 	fileDlg.m_ofn.lpstrFilter="Txt Files(*.txt)\0*.txt\0\0\0";
 	fileDlg.m_ofn.lpstrDefExt="txt";
 	if(IDOK==fileDlg.DoModal())
 	{
 		m_loadprvkey = fileDlg.GetPathName();
	}

	UpdateData(false);	
}

void CRSAdecrypDlg::OnLoadCipher() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
	CFileDialog fileDlg(TRUE);
 	fileDlg.m_ofn.lpstrTitle="导入密文";
 	fileDlg.m_ofn.lpstrFilter="Txt Files(*.txt)\0*.txt\0\0\0";
 	fileDlg.m_ofn.lpstrDefExt="txt";
 	if(IDOK==fileDlg.DoModal())
 	{
		m_loadciphertext = fileDlg.GetPathName();
		
 	}
	UpdateData(false);
}

void CRSAdecrypDlg::OnLoadCipher2() 
{
	// TODO: Add your control notification handler code here
	UpdateData();
//	UCHAR* tmp = prvkey.decrypt(ciphertext, &dlen);
	CFileDialog fileDlg(false);
  	fileDlg.m_ofn.lpstrTitle="解密";
 	fileDlg.m_ofn.lpstrFilter="txt Files(*.txt)\0*.txt\0\0\0";
 	fileDlg.m_ofn.lpstrDefExt="txt";
	if(IDOK==fileDlg.DoModal())
	{
		m_saveplain = fileDlg.GetPathName();
	}
	UpdateData(false);	
}

void CRSAdecrypDlg::OnDecrypt() 
{
	// TODO: Add your control notification handler code here
		UpdateData();

	if( m_loadciphertext.IsEmpty() || m_loadprvkey.IsEmpty() || m_saveplain.IsEmpty() )
	{
		MessageBox("请输入路径");
		return;
	}
		

		/////导入私钥
		fstream fout2 (m_loadprvkey,ios::in | ios::binary);
		CString pBuf("");
		fout2.read(pBuf.GetBuffer(5),5);
		while(!fout2.eof())
		{
			if(memcmp(pBuf, "PRIK|", 5) == 0)
				{
					break;
				}
			fout2.seekg(-4, ios::cur);
			fout2.read(pBuf.GetBuffer(5),5);
		}
		pBuf.ReleaseBuffer(5);
		if(fout2.eof())
		{
			MessageBox("私钥格式错误");
			return ;
		}
//		fout2 >> prvkey;

			char* prvklen1 = new char[4];
		char* prvklen2 = new char[4];
		char* prvklen3 = new char[4];
		char* prvklen4 = new char[4];
		memset(prvklen1, 0, 4);
		memset(prvklen2, 0, 4);
		memset(prvklen3, 0, 4);
		memset(prvklen4, 0, 4);
		int count1 = 0;
		int count2 = 0;
		int count3 = 0;
		int count4 = 0;
		fout2.read(prvklen1, 3);
		fout2.read(prvklen2, 3);
		fout2.read(prvklen3, 3);
		fout2.read(prvklen4, 3);
		count1 = atoi(prvklen1);
		count2 = atoi(prvklen2);
		count3 = atoi(prvklen3);
		count4 = atoi(prvklen4);
		char* prvkp = new char [count1+1];
		char* prvkm = new char [count2+1];
		char* prvkpu = new char [count3+1];
		char* prvkpv = new char [count4+1];
		memset(prvkp, 0, count1+1);
		memset(prvkm, 0, count2+1);
		memset(prvkpu, 0, count3+1);
		memset(prvkpv, 0, count4+1);
		fout2.read(prvkp, count1);
		fout2.read(prvkm, count2);
		fout2.read(prvkpu, count3);
		fout2.read(prvkpv, count4);
		LINT p1 = LINT(prvkp, 16);
		LINT q1 = LINT(prvkm, 16);
		LINT pu = LINT(prvkpu, 16);
		LINT pv = LINT(prvkpv, 16);
		delete []prvkp;
		delete []prvkm;
		delete []prvkpu;
		delete []prvkpv;
		KEYSTRUCT key1;
		key1.p = p1;
		key1.q = q1;
		key1.pubexp = pu;
		key1.prvexp = pv;
		key1.mod = key1.p * key1.q;
		key1.ep = key1.prvexp % (key1.p - 1);
		key1.eq = key1.prvexp % (key1.q - 1);
		key1.r = inv (key1.p, key1.q); 
		key1.bitlen_mod = ld (key1.mod);
		key1.bytelen_mod = key1.bitlen_mod >> 3;
		if ((key1.bitlen_mod % 8) > 0)
		{
			++key1.bytelen_mod;
		}
		prvkey.key.bitlen_mod = key1.bitlen_mod;
		prvkey.key.bytelen_mod = key1.bytelen_mod;
		prvkey.key.ep = key1.ep;
		prvkey.key.eq = key1.eq;
		prvkey.key.mod = key1.mod;
		prvkey.key.p = key1.p;
		prvkey.key.prvexp = key1.prvexp;
		prvkey.key.pubexp = key1.pubexp;
		prvkey.key.q = key1.q;
		prvkey.key.r = key1.r;



	
	fstream fin(m_loadciphertext, ios::in | ios::binary );
		fstream fp( m_saveplain, ios::out | ios::binary );
		CString pBuf1("");
		fin.read(pBuf1.GetBuffer(5),5);
		while(!fin.eof())
		{
			if(memcmp(pBuf1, "CIPH|", 5) == 0)
				{
					break;
				}
			fin.seekg(-4, ios::cur   );
			fin.read(pBuf1.GetBuffer(5),5);
		}
		pBuf1.ReleaseBuffer(5);
		if(fin.eof())
		{
			MessageBox("密文格式错误");
			return ;
		}
		int tmeleng = 0;
		char* block = new char[256];
		memset(block, 0, 256);
		int LenEncryptionBlock = prvkey.keyvalue().bytelen_mod - 12; 
		////分组的长度最大为为mod-1-2-8
        UCHAR* EncryptionBlock = new UCHAR[LenEncryptionBlock];
		UCHAR* sigtext = new UCHAR[LenEncryptionBlock];
		memset(sigtext,0,LenEncryptionBlock);
		char* bytecount = new char[4];
		memset(bytecount, 0, 4);
		int count = 0;
		while( !fin.eof() )
		{
			fin.read(bytecount, 3);
			count = atoi(bytecount);
		    if( count == 0)
				break;			
			fin.read(block, count) ;			
			if(block[0]==0 && block[1] == 0 )
				break;
			LINT ciphertext = LINT(block, 16);
			sigtext = prvkey.decrypt(ciphertext, &tmeleng);
			fp.write(sigtext, strlen((char*)sigtext));
			memset(block, 0, 256);
			memset(sigtext,0,LenEncryptionBlock);
			memset(bytecount, 0, 4);
		}		

	fin.close ();	
	fp.close();
	delete []block;
	MessageBox("解密成功");


	UpdateData(false);
}