1 //
2 // Copyright (C) 2020 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 #pragma once
17 
18 #include <list>
19 #include <mutex>
20 #include <vector>
21 
22 #include <tss2/tss2_tcti.h>
23 
24 #include "host/commands/secure_env/tpm.h"
25 
26 namespace cuttlefish {
27 
28 /*
29  * Exposes a TSS2_TCTI_CONTEXT for interacting with an in-process TPM simulator.
30  *
31  * TSS2_TCTI_CONTEXT is the abstraction for "communication channel to a TPM".
32  * It is not safe to create more than one of these per process or per working
33  * directory, as the TPM simulator implementation relies heavily on global
34  * variables and files saved in the working directory.
35  *
36  * TODO(schuffelen): Consider moving this to a separate process with its own
37  * working directory.
38  */
39 class InProcessTpm : public Tpm {
40 public:
41   InProcessTpm();
42   ~InProcessTpm();
43 
44   TSS2_TCTI_CONTEXT* TctiContext() override;
45 private:
46  class Impl;
47 
48  std::unique_ptr<Impl> impl_;
49 };
50 
51 }  // namespace cuttlefish
52