signaturedlg.cpp

CryptAPI数字签名。可以对文件进行数字签名

// SignatureDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Signature.h"
#include "SignatureDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
#include <wincrypt.h>
/////////////////////////////////////////////////////////////////////////////
// CSignatureDlg dialog
/////////////////////////////////////////////////////////////////////////////
// CApiEncryptDlg dialog
#pragma  comment(  lib,  "crypt32.lib")
#pragma  comment(  lib,  "advapi32.lib")
CSignatureDlg::CSignatureDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CSignatureDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CSignatureDlg)
	m_file = _T("c:\\aaa.jpg");
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CSignatureDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CSignatureDlg)
	DDX_Control(pDX, IDC_EData, m_data);
	DDX_Text(pDX, IDC_EFile, m_file);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CSignatureDlg, CDialog)
	//{{AFX_MSG_MAP(CSignatureDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BSignature, OnBSignature)
	ON_BN_CLICKED(IDC_BCmp, OnBCmp)
	ON_EN_CHANGE(IDC_EData, OnChangeEData)
	ON_EN_CHANGE(IDC_EFile, OnChangeEFile)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSignatureDlg message handlers

BOOL CSignatureDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// 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
}

// 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 CSignatureDlg::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 CSignatureDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CSignatureDlg::OnBSignature() 
{
//变量声明：
HCRYPTPROV hProv;// CSP的句柄
HCRYPTHASH hHash;//散列的句柄
const int BUFFER=4096;//缓冲区大小
int dReadLen;
BYTE pBuffer[BUFFER];
//存放读文件内容的缓冲区
BYTE pSignature[16];//存放签名的缓冲区
DWORD dSignatureLen=16;//签名的长度
FILE *fp;     //一个文件流
fp=fopen(m_file,"rb");
if(!fp){
AfxMessageBox("没有该文件");
return; 
}
memset(pSignature,0,256);
if(!CryptAcquireContext(&hProv,NULL,NULL,PROV_RSA_FULL,0)) 
//连接默认的CSP，接受它的句柄放入hProv 
{//错误处理
AfxMessageBox("error1");
return; 
} 
if(!CryptCreateHash(hProv,CALG_MD5,0,0,&hHash)) 
//使用MD5算法创建一个散列对象，得到它的句柄放入hHash 
{ 
 //错误处理
AfxMessageBox("error2");
return; 
} 
 
do{ 
  dReadLen=fread(pBuffer,1,BUFFER,fp); 
  
  if(!CryptHashData(hHash,pBuffer,dReadLen,0)) 
  //根据文件的内容计算散列值
  { 
  //错误处理
  AfxMessageBox("error3");
  return; 
  } 
  if(dReadLen<BUFFER)break;
  }while(1); 
 
if(FALSE==CryptSignHash(hHash,AT_SIGNATURE,NULL,0,pSignature,&dSignatureLen)){ 
  //错误处理
//  AfxMessageBox("error4");
return; 
} 
FILE *fp1=fopen("c:\\ahash","wb");
fwrite(pSignature,1,dSignatureLen,fp1);
fclose(fp1);
char dat[2048];
memset(dat,0,2048);
BYTE c;
char a,b;
for(int i=0;i<256;i++){
  c=pSignature[i];
  a=c&0xf0;
  a=a>>4;
  if(a>9)a=(char)('A'+a-10);
  else a=(char)('0'+a);

  b=c&0x0f;
  if(b>9)a=(char)('A'+b-10);
  else b=(char)('0'+b);
  sprintf(dat+strlen(dat),"%c%c,",a,b);
}
m_data.SetWindowText(dat);
CryptDestroyHash(hHash);
CryptReleaseContext(hProv,0);
AfxMessageBox("在C:建立了签名文件ahash !");	
}

void CSignatureDlg::OnBCmp() 
{
Test();	
}

void CSignatureDlg::OnChangeEData() 
{
UpdateData();
}

void CSignatureDlg::OnChangeEFile() 
{
UpdateData();
}

void CSignatureDlg::Test()
{
HCRYPTPROV hProv = 0;
#define BUFFER_SIZE 256
BYTE pbBuffer[BUFFER_SIZE];
HCRYPTHASH hHash = 0;
BYTE *pbSignature = NULL;
DWORD dwSigLen;
LPTSTR szDescription = TEXT("Test Data");
DWORD i;
char inf[256];
// Get a handle to the default provider.
if(!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL, 0)) {
    sprintf(inf,"Error %x during CryptAcquireContext!\n", GetLastError());
    AfxMessageBox(inf);   
	goto done;
}

// Fill the buffer with test data.
for(i = 0 ; i < BUFFER_SIZE ; i++) {
    pbBuffer[i] = (BYTE)i;
}

// Create a hash object.
if(!CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash)) {
    sprintf(inf,"Error %x during CryptCreateHash!\n", GetLastError());
    AfxMessageBox(inf);   
    goto done;
}

// Compute the cryptographic hash of the buffer.
if(!CryptHashData(hHash, pbBuffer, BUFFER_SIZE, 0)) {
    sprintf(inf,"Error %x during CryptHashData!\n", GetLastError());
    AfxMessageBox(inf);   
    goto done;
}

// Determine the size of the signature and allocate memory.
dwSigLen= 0;
if(!CryptSignHash(hHash, AT_SIGNATURE, NULL, 0, NULL,&dwSigLen)) {
    sprintf(inf,"Error0000 %x during CryptSignHash!\n", GetLastError());
    AfxMessageBox(inf);       
	if(GetLastError()!=NTE_BAD_LEN) goto done;
}
if((pbSignature =(BYTE*)malloc(dwSigLen)) == NULL) {
    printf("Out of memory!\n");
    goto done;
}

// Sign the hash object.
if(!CryptSignHash(hHash, AT_SIGNATURE, szDescription, 0, pbSignature, 
                        &dwSigLen)) {
    sprintf(inf,"Error11111 %x during CryptSignHash!\n", GetLastError());
    AfxMessageBox(inf);       
    goto done;
}

// Store or transmit the signature, test buffer, and description string.
done:

// Free memory to be used to store signature.
if(pbSignature != NULL) free(pbSignature);

// Destroy the hash object.
if(hHash != 0) CryptDestroyHash(hHash);

// Release the provider handle.
if(hProv != 0) CryptReleaseContext(hProv, 0);
AfxMessageBox("验证成功!");
}