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 25 namespace tpm_manager { 26 27 class TpmConnection { 28 public: 29 TpmConnection() = default; 30 // Create a TPM connection and set an |authorization_value| for the TPM object 31 // (e.g. the TPM owner password). 32 explicit TpmConnection(const std::string& authorization_value); 33 ~TpmConnection() = default; 34 35 // This method returns a handle to the current Tpm context. 36 // Note: this method still retains ownership of the context. If this class 37 // is deleted, the context handle will be invalidated. Returns 0 on failure. 38 TSS_HCONTEXT GetContext(); 39 40 // This method tries to get a handle to the TPM. Returns 0 on failure. 41 TSS_HTPM GetTpm(); 42 43 private: 44 // This method connects to the Tpm. Returns true on success. 45 bool ConnectContextIfNeeded(); 46 47 trousers::ScopedTssContext context_; 48 std::string authorization_value_; 49 50 DISALLOW_COPY_AND_ASSIGN(TpmConnection); 51 }; 52 53 } // namespace tpm_manager 54 55 #endif // TPM_MANAGER_SERVER_TPM_CONNECTION_H_ 56