1 // Copyright 2017 The Abseil Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef ABSL_RANDOM_INTERNAL_RANDEN_HWAES_H_ 16 #define ABSL_RANDOM_INTERNAL_RANDEN_HWAES_H_ 17 18 #include "absl/base/config.h" 19 20 // HERMETIC NOTE: The randen_hwaes target must not introduce duplicate 21 // symbols from arbitrary system and other headers, since it may be built 22 // with different flags from other targets, using different levels of 23 // optimization, potentially introducing ODR violations. 24 25 namespace absl { 26 ABSL_NAMESPACE_BEGIN 27 namespace random_internal { 28 29 // RANDen = RANDom generator or beetroots in Swiss German. 30 // 'Strong' (well-distributed, unpredictable, backtracking-resistant) random 31 // generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32. 32 // 33 // RandenHwAes implements the basic state manipulation methods. 34 class RandenHwAes { 35 public: 36 static void Generate(const void* keys, void* state_void); 37 static void Absorb(const void* seed_void, void* state_void); 38 static const void* GetKeys(); 39 }; 40 41 // HasRandenHwAesImplementation returns true when there is an accelerated 42 // implementation, and false otherwise. If there is no implementation, 43 // then attempting to use it will abort the program. 44 bool HasRandenHwAesImplementation(); 45 46 } // namespace random_internal 47 ABSL_NAMESPACE_END 48 } // namespace absl 49 50 #endif // ABSL_RANDOM_INTERNAL_RANDEN_HWAES_H_ 51