scoped_key_handle.cc revision 4dc4629c415e7ca90ff146d7bb75b5646ecd8b17 
1//
2// Copyright (C) 2014 The Android Open Source Project
3//
4// Licensed under the Apache License, Version 2.0 (the "License");
5// you may not use this file except in compliance with the License.
6// You may obtain a copy of the License at
7//
8//      http://www.apache.org/licenses/LICENSE-2.0
9//
10// Unless required by applicable law or agreed to in writing, software
11// distributed under the License is distributed on an "AS IS" BASIS,
12// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13// See the License for the specific language governing permissions and
14// limitations under the License.
15//
16
17#include "trunks/scoped_key_handle.h"
18
19#include <base/logging.h>
20
21#include "trunks/error_codes.h"
22
23namespace {
24
25const trunks::TPM_HANDLE kInvalidHandle = 0;
26
27}  // namespace
28
29namespace trunks {
30
31ScopedKeyHandle::ScopedKeyHandle(const TrunksFactory& factory)
32    : factory_(factory), handle_(kInvalidHandle) {}
33
34ScopedKeyHandle::ScopedKeyHandle(const TrunksFactory& factory,
35                                 TPM_HANDLE handle)
36    : factory_(factory), handle_(handle) {}
37
38ScopedKeyHandle::~ScopedKeyHandle() {
39  if (handle_ != kInvalidHandle) {
40    FlushHandleContext(handle_);
41  }
42}
43
44TPM_HANDLE ScopedKeyHandle::release() {
45  TPM_HANDLE tmp_handle = handle_;
46  handle_ = kInvalidHandle;
47  return tmp_handle;
48}
49
50void ScopedKeyHandle::reset(TPM_HANDLE new_handle) {
51  TPM_HANDLE tmp_handle = handle_;
52  handle_ = new_handle;
53  if (tmp_handle != kInvalidHandle) {
54    FlushHandleContext(tmp_handle);
55  }
56}
57
58void ScopedKeyHandle::reset() {
59  reset(kInvalidHandle);
60}
61
62TPM_HANDLE* ScopedKeyHandle::ptr() {
63  return &handle_;
64}
65
66TPM_HANDLE ScopedKeyHandle::get() const {
67  return handle_;
68}
69
70void ScopedKeyHandle::FlushHandleContext(TPM_HANDLE handle) {
71  TPM_RC result = TPM_RC_SUCCESS;
72  result = factory_.GetTpm()->FlushContextSync(handle, nullptr);
73  if (result) {
74    LOG(WARNING) << "Error closing handle: " << handle << " : "
75                 << GetErrorString(result);
76  }
77}
78
79}  // namespace trunks
80