48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
// Copyright 2017 The Abseil Authors.
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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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// https://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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#ifndef ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_
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#define ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_
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#include <cstddef>
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#include "absl/base/config.h"
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namespace absl {
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ABSL_NAMESPACE_BEGIN
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namespace random_internal {
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// RANDen = RANDom generator or beetroots in Swiss German.
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// RandenSlow implements the basic state manipulation methods for
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// architectures lacking AES hardware acceleration intrinsics.
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class RandenSlow {
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public:
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// Size of the entire sponge / state for the randen PRNG.
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static constexpr size_t kStateBytes = 256; // 2048-bit
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// Size of the 'inner' (inaccessible) part of the sponge. Larger values would
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// require more frequent calls to RandenGenerate.
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static constexpr size_t kCapacityBytes = 16; // 128-bit
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static void Generate(const void* keys, void* state_void);
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static void Absorb(const void* seed_void, void* state_void);
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static const void* GetKeys();
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};
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} // namespace random_internal
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ABSL_NAMESPACE_END
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} // namespace absl
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#endif // ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_
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