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 #include "trunks/hmac_session_impl.h" 18 19 #include <string> 20 21 #include <base/logging.h> 22 #include <base/macros.h> 23 #include <base/stl_util.h> 24 #include <openssl/rand.h> 25 26 namespace trunks { 27 28 HmacSessionImpl::HmacSessionImpl(const TrunksFactory& factory) 29 : factory_(factory) { 30 session_manager_ = factory_.GetSessionManager(); 31 } 32 33 HmacSessionImpl::~HmacSessionImpl() { 34 session_manager_->CloseSession(); 35 } 36 37 AuthorizationDelegate* HmacSessionImpl::GetDelegate() { 38 if (session_manager_->GetSessionHandle() == kUninitializedHandle) { 39 return nullptr; 40 } 41 return &hmac_delegate_; 42 } 43 44 TPM_RC HmacSessionImpl::StartBoundSession( 45 TPMI_DH_ENTITY bind_entity, 46 const std::string& bind_authorization_value, 47 bool enable_encryption) { 48 return session_manager_->StartSession(TPM_SE_HMAC, bind_entity, 49 bind_authorization_value, 50 enable_encryption, &hmac_delegate_); 51 } 52 53 TPM_RC HmacSessionImpl::StartUnboundSession(bool enable_encryption) { 54 // Starting an unbound session is the same as starting a session bound to 55 // TPM_RH_NULL. In this case, the authorization is the zero length buffer. 56 // We can therefore simply call StartBoundSession with TPM_RH_NULL as the 57 // binding entity, and the empty string as the authorization. 58 return StartBoundSession(TPM_RH_NULL, "", enable_encryption); 59 } 60 61 void HmacSessionImpl::SetEntityAuthorizationValue(const std::string& value) { 62 hmac_delegate_.set_entity_authorization_value(value); 63 } 64 65 void HmacSessionImpl::SetFutureAuthorizationValue(const std::string& value) { 66 hmac_delegate_.set_future_authorization_value(value); 67 } 68 69 } // namespace trunks 70
