1//
2// Copyright (C) 2015 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#ifndef TPM_MANAGER_SERVER_TPM_CONNECTION_H_
18#define TPM_MANAGER_SERVER_TPM_CONNECTION_H_
19
20#include <string>
21
22#include <base/macros.h>
23#include <trousers/scoped_tss_type.h>
24
25namespace tpm_manager {
26
27class TpmConnection {
28 public:
29  TpmConnection() = default;
30  ~TpmConnection() = default;
31
32  // This method returns a handle to the current Tpm context.
33  // Note: this method still retains ownership of the context. If this class
34  // is deleted, the context handle will be invalidated. Returns 0 on failure.
35  TSS_HCONTEXT GetContext();
36
37  // This method tries to get a handle to the TPM. Returns 0 on failure.
38  TSS_HTPM GetTpm();
39
40  // This method tries to get a handle to the TPM and with the given owner
41  // password. Returns 0 on failure.
42  TSS_HTPM GetTpmWithAuth(const std::string& owner_password);
43
44 private:
45  // This method connects to the Tpm. Returns true on success.
46  bool ConnectContextIfNeeded();
47
48  trousers::ScopedTssContext context_;
49
50  DISALLOW_COPY_AND_ASSIGN(TpmConnection);
51};
52
53}  // namespace tpm_manager
54
55#endif  // TPM_MANAGER_SERVER_TPM_CONNECTION_H_
56