43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
//
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// Copyright (C) 2020 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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#pragma once
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#include <keymaster/random_source.h>
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struct ESYS_CONTEXT;
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namespace cuttlefish {
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/**
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* Secure random number generator, pulling data from a TPM.
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*
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* RandomSource is used by the OpenSSL HMAC key and AES key implementations.
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*/
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class TpmRandomSource : public keymaster::RandomSource {
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public:
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TpmRandomSource(ESYS_CONTEXT* esys);
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virtual ~TpmRandomSource() = default;
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keymaster_error_t GenerateRandom(
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uint8_t* buffer, size_t length) const override;
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keymaster_error_t AddRngEntropy(const uint8_t*, size_t) const;
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private:
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ESYS_CONTEXT* esys_;
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};
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} // namespace cuttlefish
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