upload android base code part6

android/system/tpm/trunks/hmac_session_impl.cc

@@ -0,0 +1,69 @@
+//
+// Copyright (C) 2015 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+#include "trunks/hmac_session_impl.h"
+
+#include <string>
+
+#include <base/logging.h>
+#include <base/macros.h>
+#include <base/stl_util.h>
+#include <openssl/rand.h>
+
+namespace trunks {
+
+HmacSessionImpl::HmacSessionImpl(const TrunksFactory& factory)
+    : factory_(factory) {
+  session_manager_ = factory_.GetSessionManager();
+}
+
+HmacSessionImpl::~HmacSessionImpl() {
+  session_manager_->CloseSession();
+}
+
+AuthorizationDelegate* HmacSessionImpl::GetDelegate() {
+  if (session_manager_->GetSessionHandle() == kUninitializedHandle) {
+    return nullptr;
+  }
+  return &hmac_delegate_;
+}
+
+TPM_RC HmacSessionImpl::StartBoundSession(
+    TPMI_DH_ENTITY bind_entity,
+    const std::string& bind_authorization_value,
+    bool enable_encryption) {
+  return session_manager_->StartSession(TPM_SE_HMAC, bind_entity,
+                                        bind_authorization_value,
+                                        enable_encryption, &hmac_delegate_);
+}
+
+TPM_RC HmacSessionImpl::StartUnboundSession(bool enable_encryption) {
+  // Starting an unbound session is the same as starting a session bound to
+  // TPM_RH_NULL. In this case, the authorization is the zero length buffer.
+  // We can therefore simply call StartBoundSession with TPM_RH_NULL as the
+  // binding entity, and the empty string as the authorization.
+  return StartBoundSession(TPM_RH_NULL, "", enable_encryption);
+}
+
+void HmacSessionImpl::SetEntityAuthorizationValue(const std::string& value) {
+  hmac_delegate_.set_entity_authorization_value(value);
+}
+
+void HmacSessionImpl::SetFutureAuthorizationValue(const std::string& value) {
+  hmac_delegate_.set_future_authorization_value(value);
+}
+
+}  // namespace trunks