Function create_dir_iv

libcppcryptfs/util/fileutil.cpp:626–699

#ifdef _WIN32
bool
create_dir_iv(CryptContext *con, LPCWSTR path)
{

	if (con && !con->GetConfig()->DirIV())
		return true;

	DWORD error = 0;
	HANDLE hfile = INVALID_HANDLE_VALUE;

	try {

		unsigned char diriv[DIR_IV_LEN];

		if (!get_random_bytes(con, diriv, DIR_IV_LEN))
			throw ((int)(GetLastError() ? GetLastError() : ERROR_OUTOFMEMORY));

		wstring path_str = path;

		LPCWSTR encpath = &path_str[0];

		if (!encpath)
			throw((int)ERROR_OUTOFMEMORY);

		if (path_str[path_str.size() - 1] != '\\') {
			path_str.push_back('\\');
		}

		path_str.append(DIR_IV_NAME);

		hfile = CreateFile(&path_str[0], GENERIC_WRITE, FILE_SHARE_READ, NULL, CREATE_NEW, 0, NULL);

		if (hfile == INVALID_HANDLE_VALUE)
			throw((int)ERROR_ACCESS_DENIED);

		DWORD nWritten = 0;
		if (!WriteFile(hfile, diriv, DIR_IV_LEN, &nWritten, NULL)) {
			throw((int)GetLastError());
		}

		if (nWritten != DIR_IV_LEN) {
			throw((int)ERROR_OUTOFMEMORY);
		}

		FILETIME LastWriteTime;

		if (!GetFileTime(hfile, NULL, NULL, &LastWriteTime)) {
			throw((int)GetLastError());
		}

		CloseHandle(hfile);
		hfile = INVALID_HANDLE_VALUE;

		// assume somebody will want to use it soon
		if (con)
			con->m_dir_iv_cache.store(path, diriv, LastWriteTime);

		DWORD attr = GetFileAttributesW(&path_str[0]);