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authorGravatar Abseil Team <absl-team@google.com>2019-08-08 10:56:58 -0700
committerGravatar CJ Johnson <johnsoncj@google.com>2019-08-08 14:19:45 -0400
commitaa844899c937bde5d2b24f276b59997e5b668bde (patch)
treecd18e64150abc74b85bbbf6abf990f66fa47cacd /absl/random/internal/randen_traits.h
parentfcb104594b0bb4b8ac306cb2f55ecdad40974683 (diff)
Creation of LTS branch "lts_2019_08_08"20190808
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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_TRAITS_H_
+#define ABSL_RANDOM_INTERNAL_RANDEN_TRAITS_H_
+
+// HERMETIC NOTE: The randen_hwaes target must not introduce duplicate
+// symbols from arbitrary system and other headers, since it may be built
+// with different flags from other targets, using different levels of
+// optimization, potentially introducing ODR violations.
+
+#include <cstddef>
+
+namespace absl {
+inline namespace lts_2019_08_08 {
+namespace random_internal {
+
+// RANDen = RANDom generator or beetroots in Swiss German.
+// 'Strong' (well-distributed, unpredictable, backtracking-resistant) random
+// generator, faster in some benchmarks than std::mt19937_64 and pcg64_c32.
+//
+// RandenTraits contains the basic algorithm traits, such as the size of the
+// state, seed, sponge, etc.
+struct RandenTraits {
+ // 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
+
+ // Size of the default seed consumed by the sponge.
+ static constexpr size_t kSeedBytes = kStateBytes - kCapacityBytes;
+
+ // Largest size for which security proofs are known.
+ static constexpr size_t kFeistelBlocks = 16;
+
+ // Type-2 generalized Feistel => one round function for every two blocks.
+ static constexpr size_t kFeistelFunctions = kFeistelBlocks / 2; // = 8
+
+ // Ensures SPRP security and two full subblock diffusions.
+ // Must be > 4 * log2(kFeistelBlocks).
+ static constexpr size_t kFeistelRounds = 16 + 1;
+};
+
+} // namespace random_internal
+} // inline namespace lts_2019_08_08
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_RANDEN_TRAITS_H_