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先介紹一款小巧的hash工具，就是下圖這個，可以計算文件的md5值，SHA1值和CRC32值。不到100kb，功能也很簡單，就是對文件進行校驗，檢查是否被篡改過。

對于網上下載linux操作系統和windows操作系統，進行安裝的人會很方便，校驗后對比官方提供的校驗值?？芍牢募欠癖淮鄹牧?，是否被添加了不明來源程序。

下面我們通過編程實現它，這個是界面。

這里只實現了md5校驗。

關鍵函數如下，線程中計算md5值。

UINT ThreadProc(LPVOID pParam)
{
	b_IsRunning=1;
	g_csThreadRunning.Lock();
	CHashDlg *myHashDlg=(CHashDlg*)pParam;

	int m_TotalFiles=myHashDlg->m_FileArray.GetCount();

	myHashDlg->m_ProgressTotal.SetRange(0, m_TotalFiles);
	for (int i=0; i < m_TotalFiles; i++)
	{
		MD5_CTX md5_ctx;
		unsigned char decrypt[16];

		char* m_binbuf;
		ULONGLONG m_binlen;
		CFile BinFile;
		if (!BinFile.Open((LPCTSTR)(myHashDlg->m_FileArray.GetAt(i)), CFile::modeRead | CFile::typeBinary)) {
			continue;
		}

		m_binlen=BinFile.GetLength();
		int totalBlock=m_binlen / 102400 + 1;
		myHashDlg->m_ProgressFile.SetRange(0, totalBlock);
		m_binbuf=new char[1024000];
		int totalread=0;
		MD5Init(&md5_ctx);
		for (;;) {
			int readlen=BinFile.Read(m_binbuf, 1024000);
			if (readlen <=0) {
				break;
			}
			totalread +=readlen;

			myHashDlg->m_ProgressFile.SetPos(totalread / 102400);
			MD5Update(&md5_ctx, (PUCHAR)m_binbuf, readlen);
			if (b_IsRunning !=1) {
				break;
			}
		}
		myHashDlg->m_ProgressFile.SetPos(totalBlock);

		delete[] m_binbuf;

		MD5Final(&md5_ctx, decrypt);
		BinFile.Close();

		myHashDlg->m_ProgressTotal.SetPos(i);
		if (b_IsRunning !=1) {
			break;
		}

		CString md5String;
		for (int i=0; i < 16; i++)
		{
			//printf("%02x", decrypt[i]);
			TCHAR szW[20];
			_stprintf_s(szW, 20, _T("%02X"), decrypt[i]);
			md5String.Append(szW);
		}
		CString strFileLen;
		strFileLen.Format(_T("%lld bytes"), m_binlen);
		myHashDlg->m_MD5Result +=_T("File: ");
		myHashDlg->m_MD5Result +=myHashDlg->m_FileArray.GetAt(i);
		myHashDlg->m_MD5Result +=_T("\r\n");

		myHashDlg->m_MD5Result +=_T("Size: ");
		myHashDlg->m_MD5Result +=strFileLen;
		myHashDlg->m_MD5Result +=_T("\r\n");

		myHashDlg->m_MD5Result +=md5String;
		myHashDlg->m_MD5Result +=_T("\r\n");
		myHashDlg->m_MD5Result +=_T("\r\n");
		myHashDlg->SendMessage(WM_UPDATEMYDATA, FALSE);
	}
	myHashDlg->m_ProgressTotal.SetPos(m_TotalFiles);

	g_csThreadRunning.Unlock();
	return 0;
}

選擇文件函數，選擇后開始計算。

void CHashDlg::OnBnClickedButtonSelectFiles()
{
	CFileDialog   Dlg(TRUE, NULL, NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT | OFN_ALLOWMULTISELECT);
	if (Dlg.DoModal()==IDOK)
	{
		b_IsRunning=0;
		g_csThreadRunning.Lock();
		m_FileArray.RemoveAll();
		POSITION pos=Dlg.GetStartPosition();
		while (pos)
		{
			m_FileArray.Add(Dlg.GetNextPathName(pos));
		}
		g_csThreadRunning.Unlock();
		if (m_FileArray.GetCount() > 0) {
			b_IsRunning=1;
			CWinThread* pThread=AfxBeginThread(ThreadProc, this);
		}
	}
}

下面是md5算法實現文件