1 // Copyright 2017 The Abseil Authors.
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
7 // https://www.apache.org/licenses/LICENSE-2.0
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.
15 #ifndef ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_
16 #define ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_
21 namespace random_internal {
23 // RANDen = RANDom generator or beetroots in Swiss German.
24 // RandenSlow implements the basic state manipulation methods for
25 // architectures lacking AES hardware acceleration intrinsics.
28 // Size of the entire sponge / state for the randen PRNG.
29 static constexpr size_t kStateBytes = 256; // 2048-bit
31 // Size of the 'inner' (inaccessible) part of the sponge. Larger values would
32 // require more frequent calls to RandenGenerate.
33 static constexpr size_t kCapacityBytes = 16; // 128-bit
35 static void Generate(const void* keys, void* state_void);
36 static void Absorb(const void* seed_void, void* state_void);
37 static const void* GetKeys();
40 } // namespace random_internal
43 #endif // ABSL_RANDOM_INTERNAL_RANDEN_SLOW_H_