summaryrefslogtreecommitdiff
path: root/absl/random/internal/randen.h
diff options
context:
space:
mode:
authorGravatar Abseil Team <absl-team@google.com>2019-06-21 13:11:42 -0700
committerGravatar Gennadiy Rozental <rogeeff@google.com>2019-06-21 16:18:10 -0400
commite9324d926a9189e222741fce6e676f0944661a72 (patch)
treea08568a709940c376454da34c9d8aac021378e5f /absl/random/internal/randen.h
parent43ef2148c0936ebf7cb4be6b19927a9d9d145b8f (diff)
Export of internal Abseil changes.
-- 7a6ff16a85beb730c172d5d25cf1b5e1be885c56 by Laramie Leavitt <lar@google.com>: Internal change. PiperOrigin-RevId: 254454546 -- ff8f9bafaefc26d451f576ea4a06d150aed63f6f by Andy Soffer <asoffer@google.com>: Internal changes PiperOrigin-RevId: 254451562 -- deefc5b651b479ce36f0b4ef203e119c0c8936f2 by CJ Johnson <johnsoncj@google.com>: Account for subtracting unsigned values from the size of InlinedVector PiperOrigin-RevId: 254450625 -- 3c677316a27bcadc17e41957c809ca472d5fef14 by Andy Soffer <asoffer@google.com>: Add C++17's std::make_from_tuple to absl/utility/utility.h PiperOrigin-RevId: 254411573 -- 4ee3536a918830eeec402a28fc31a62c7c90b940 by CJ Johnson <johnsoncj@google.com>: Adds benchmark for the rest of the InlinedVector public API PiperOrigin-RevId: 254408378 -- e5a21a00700ee83498ff1efbf649169756463ee4 by CJ Johnson <johnsoncj@google.com>: Updates the definition of InlinedVector::shrink_to_fit() to be exception safe and adds exception safety tests for it. PiperOrigin-RevId: 254401387 -- 2ea82e72b86d82d78b4e4712a63a55981b53c64b by Laramie Leavitt <lar@google.com>: Use absl::InsecureBitGen in place of std::mt19937 in tests absl/random/...distribution_test.cc PiperOrigin-RevId: 254289444 -- fa099e02c413a7ffda732415e8105cad26a90337 by Andy Soffer <asoffer@google.com>: Internal changes PiperOrigin-RevId: 254286334 -- ce34b7f36933b30cfa35b9c9a5697a792b5666e4 by Andy Soffer <asoffer@google.com>: Internal changes PiperOrigin-RevId: 254273059 -- 6f9c473da7c2090c2e85a37c5f00622e8a912a89 by Jorg Brown <jorg@google.com>: Change absl::container_internal::CompressedTuple to instantiate its internal Storage class with the name of the type it's holding, rather than the name of the Tuple. This is not an externally-visible change, other than less compiler memory is used and less debug information is generated. PiperOrigin-RevId: 254269285 -- 8bd3c186bf2fc0c55d8a2dd6f28a5327502c9fba by Andy Soffer <asoffer@google.com>: Adding short-hand IntervalClosed for IntervalClosedClosed and IntervalOpen for IntervalOpenOpen. PiperOrigin-RevId: 254252419 -- ea957f99b6a04fccd42aa05605605f3b44b1ecfd by Abseil Team <absl-team@google.com>: Do not directly use __SIZEOF_INT128__. In order to avoid linker errors when building with clang-cl (__fixunsdfti, __udivti3 and __fixunssfti are undefined), this CL uses ABSL_HAVE_INTRINSIC_INT128 which is not defined for clang-cl. PiperOrigin-RevId: 254250739 -- 89ab385cd26b34d64130bce856253aaba96d2345 by Andy Soffer <asoffer@google.com>: Internal changes PiperOrigin-RevId: 254242321 -- cffc793d93eca6d6bdf7de733847b6ab4a255ae9 by CJ Johnson <johnsoncj@google.com>: Adds benchmark for InlinedVector::reserve(size_type) PiperOrigin-RevId: 254199226 -- c90c7a9fa3c8f0c9d5114036979548b055ea2f2a by Gennadiy Rozental <rogeeff@google.com>: Import of CCTZ from GitHub. PiperOrigin-RevId: 254072387 -- c4c388beae016c9570ab54ffa1d52660e4a85b7b by Laramie Leavitt <lar@google.com>: Internal cleanup. PiperOrigin-RevId: 254062381 -- d3c992e221cc74e5372d0c8fa410170b6a43c062 by Tom Manshreck <shreck@google.com>: Update distributions.h to Abseil standards PiperOrigin-RevId: 254054946 -- d15ad0035c34ef11b14fadc5a4a2d3ec415f5518 by CJ Johnson <johnsoncj@google.com>: Removes functions with only one caller from the implementation details of InlinedVector by manually inlining the definitions PiperOrigin-RevId: 254005427 -- 2f37e807efc3a8ef1f4b539bdd379917d4151520 by Andy Soffer <asoffer@google.com>: Initial release of Abseil Random PiperOrigin-RevId: 253999861 -- 24ed1694b6430791d781ed533a8f8ccf6cac5856 by CJ Johnson <johnsoncj@google.com>: Updates the definition of InlinedVector::assign(...)/InlinedVector::operator=(...) to new, exception-safe implementations with exception safety tests to boot PiperOrigin-RevId: 253993691 -- 5613d95f5a7e34a535cfaeadce801441e990843e by CJ Johnson <johnsoncj@google.com>: Adds benchmarks for InlinedVector::shrink_to_fit() PiperOrigin-RevId: 253989647 -- 2a96ddfdac40bbb8cb6a7f1aeab90917067c6e63 by Abseil Team <absl-team@google.com>: Initial release of Abseil Random PiperOrigin-RevId: 253927497 -- bf1aff8fc9ffa921ad74643e9525ecf25b0d8dc1 by Andy Soffer <asoffer@google.com>: Initial release of Abseil Random PiperOrigin-RevId: 253920512 -- bfc03f4a3dcda3cf3a4b84bdb84cda24e3394f41 by Laramie Leavitt <lar@google.com>: Internal change. PiperOrigin-RevId: 253886486 -- 05036cfcc078ca7c5f581a00dfb0daed568cbb69 by Eric Fiselier <ericwf@google.com>: Don't include `winsock2.h` because it drags in `windows.h` and friends, and they define awful macros like OPAQUE, ERROR, and more. This has the potential to break abseil users. Instead we only forward declare `timeval` and require Windows users include `winsock2.h` themselves. This is both inconsistent and poor QoI, but so including 'windows.h' is bad too. PiperOrigin-RevId: 253852615 GitOrigin-RevId: 7a6ff16a85beb730c172d5d25cf1b5e1be885c56 Change-Id: Icd6aff87da26f29ec8915da856f051129987cef6
Diffstat (limited to 'absl/random/internal/randen.h')
-rw-r--r--absl/random/internal/randen.h100
1 files changed, 100 insertions, 0 deletions
diff --git a/absl/random/internal/randen.h b/absl/random/internal/randen.h
new file mode 100644
index 00000000..a4ff2545
--- /dev/null
+++ b/absl/random/internal/randen.h
@@ -0,0 +1,100 @@
+// 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_H_
+#define ABSL_RANDOM_INTERNAL_RANDEN_H_
+
+#include <cstddef>
+
+#include "absl/random/internal/platform.h"
+#include "absl/random/internal/randen_hwaes.h"
+#include "absl/random/internal/randen_slow.h"
+#include "absl/random/internal/randen_traits.h"
+
+namespace absl {
+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.
+//
+// Randen implements the basic state manipulation methods.
+class Randen {
+ public:
+ static constexpr size_t kStateBytes = RandenTraits::kStateBytes;
+ static constexpr size_t kCapacityBytes = RandenTraits::kCapacityBytes;
+ static constexpr size_t kSeedBytes = RandenTraits::kSeedBytes;
+
+ ~Randen() = default;
+
+ Randen();
+
+ // Generate updates the randen sponge. The outer portion of the sponge
+ // (kCapacityBytes .. kStateBytes) may be consumed as PRNG state.
+ template <typename T, size_t N>
+ void Generate(T (&state)[N]) const {
+ static_assert(N * sizeof(T) == kStateBytes,
+ "Randen::Generate() requires kStateBytes of state");
+#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
+ // HW AES Dispatch.
+ if (has_crypto_) {
+ RandenHwAes::Generate(keys_, state);
+ } else {
+ RandenSlow::Generate(keys_, state);
+ }
+#elif ABSL_HAVE_ACCELERATED_AES
+ // HW AES is enabled.
+ RandenHwAes::Generate(keys_, state);
+#else
+ // HW AES is disabled.
+ RandenSlow::Generate(keys_, state);
+#endif
+ }
+
+ // Absorb incorporates additional seed material into the randen sponge. After
+ // absorb returns, Generate must be called before the state may be consumed.
+ template <typename S, size_t M, typename T, size_t N>
+ void Absorb(const S (&seed)[M], T (&state)[N]) const {
+ static_assert(M * sizeof(S) == RandenTraits::kSeedBytes,
+ "Randen::Absorb() requires kSeedBytes of seed");
+
+ static_assert(N * sizeof(T) == RandenTraits::kStateBytes,
+ "Randen::Absorb() requires kStateBytes of state");
+#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
+ // HW AES Dispatch.
+ if (has_crypto_) {
+ RandenHwAes::Absorb(seed, state);
+ } else {
+ RandenSlow::Absorb(seed, state);
+ }
+#elif ABSL_HAVE_ACCELERATED_AES
+ // HW AES is enabled.
+ RandenHwAes::Absorb(seed, state);
+#else
+ // HW AES is disabled.
+ RandenSlow::Absorb(seed, state);
+#endif
+ }
+
+ private:
+ const void* keys_;
+#if ABSL_RANDOM_INTERNAL_AES_DISPATCH
+ bool has_crypto_;
+#endif
+};
+
+} // namespace random_internal
+} // namespace absl
+
+#endif // ABSL_RANDOM_INTERNAL_RANDEN_H_