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