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63 lines
2.0 KiB
63 lines
2.0 KiB
// |
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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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