63 lines
2 KiB
C++
63 lines
2 KiB
C++
//
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// Copyright (C) 2014 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef TRUNKS_TPM_HANDLE_H_
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#define TRUNKS_TPM_HANDLE_H_
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#include "trunks/command_transceiver.h"
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#include <string>
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#include "trunks/error_codes.h"
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namespace trunks {
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// Sends commands to a TPM device via a handle to /dev/tpm0. All commands are
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// sent synchronously. The SendCommand method is supported but does not return
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// until a response is received and the callback has been called. Command and
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// response data are opaque to this class; it performs no validation.
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//
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// Example:
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// TpmHandle handle;
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// if (!handle.Init()) {...}
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// std::string response = handle.SendCommandAndWait(command);
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class TpmHandle : public CommandTransceiver {
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public:
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TpmHandle();
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~TpmHandle() override;
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// Initializes a TpmHandle instance. This method must be called successfully
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// before any other method. Returns true on success.
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bool Init() override;
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// CommandTranceiver methods.
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void SendCommand(const std::string& command,
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const ResponseCallback& callback) override;
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std::string SendCommandAndWait(const std::string& command) override;
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private:
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// Writes a |command| to /dev/tpm0 and reads the |response|. Returns
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// TPM_RC_SUCCESS on success.
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TPM_RC SendCommandInternal(const std::string& command, std::string* response);
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int fd_; // A file descriptor for /dev/tpm0.
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DISALLOW_COPY_AND_ASSIGN(TpmHandle);
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};
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} // namespace trunks
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#endif // TRUNKS_TPM_HANDLE_H_
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