tvl-depot/absl/random/internal/seed_material_test.cc

202 lines
7.2 KiB
C++
Raw Normal View History

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
2019-06-21 22:11:42 +02:00
// 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.
#include "absl/random/internal/seed_material.h"
#include <bitset>
#include <cstdlib>
#include <cstring>
#include <random>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#ifdef __ANDROID__
// Android assert messages only go to system log, so death tests cannot inspect
// the message for matching.
#define ABSL_EXPECT_DEATH_IF_SUPPORTED(statement, regex) \
EXPECT_DEATH_IF_SUPPORTED(statement, ".*")
#else
#define ABSL_EXPECT_DEATH_IF_SUPPORTED EXPECT_DEATH_IF_SUPPORTED
#endif
namespace {
using testing::Each;
using testing::ElementsAre;
using testing::Eq;
using testing::Ne;
using testing::Pointwise;
TEST(SeedBitsToBlocks, VerifyCases) {
EXPECT_EQ(0, absl::random_internal::SeedBitsToBlocks(0));
EXPECT_EQ(1, absl::random_internal::SeedBitsToBlocks(1));
EXPECT_EQ(1, absl::random_internal::SeedBitsToBlocks(31));
EXPECT_EQ(1, absl::random_internal::SeedBitsToBlocks(32));
EXPECT_EQ(2, absl::random_internal::SeedBitsToBlocks(33));
EXPECT_EQ(4, absl::random_internal::SeedBitsToBlocks(127));
EXPECT_EQ(4, absl::random_internal::SeedBitsToBlocks(128));
EXPECT_EQ(5, absl::random_internal::SeedBitsToBlocks(129));
}
TEST(ReadSeedMaterialFromOSEntropy, SuccessiveReadsAreDistinct) {
constexpr size_t kSeedMaterialSize = 64;
uint32_t seed_material_1[kSeedMaterialSize] = {};
uint32_t seed_material_2[kSeedMaterialSize] = {};
EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
absl::Span<uint32_t>(seed_material_1, kSeedMaterialSize)));
EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
absl::Span<uint32_t>(seed_material_2, kSeedMaterialSize)));
EXPECT_THAT(seed_material_1, Pointwise(Ne(), seed_material_2));
}
TEST(ReadSeedMaterialFromOSEntropy, ReadZeroBytesIsNoOp) {
uint32_t seed_material[32] = {};
std::memset(seed_material, 0xAA, sizeof(seed_material));
EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
absl::Span<uint32_t>(seed_material, 0)));
EXPECT_THAT(seed_material, Each(Eq(0xAAAAAAAA)));
}
TEST(ReadSeedMaterialFromOSEntropy, NullPtrVectorArgument) {
#ifdef NDEBUG
EXPECT_FALSE(absl::random_internal::ReadSeedMaterialFromOSEntropy(
absl::Span<uint32_t>(nullptr, 32)));
#else
bool result;
ABSL_EXPECT_DEATH_IF_SUPPORTED(
result = absl::random_internal::ReadSeedMaterialFromOSEntropy(
absl::Span<uint32_t>(nullptr, 32)),
"!= nullptr");
(void)result; // suppress unused-variable warning
#endif
}
TEST(ReadSeedMaterialFromURBG, SeedMaterialEqualsVariateSequence) {
// Two default-constructed instances of std::mt19937_64 are guaranteed to
// produce equal variate-sequences.
std::mt19937 urbg_1;
std::mt19937 urbg_2;
constexpr size_t kSeedMaterialSize = 1024;
uint32_t seed_material[kSeedMaterialSize] = {};
EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromURBG(
&urbg_1, absl::Span<uint32_t>(seed_material, kSeedMaterialSize)));
for (uint32_t seed : seed_material) {
EXPECT_EQ(seed, urbg_2());
}
}
TEST(ReadSeedMaterialFromURBG, ReadZeroBytesIsNoOp) {
std::mt19937_64 urbg;
uint32_t seed_material[32];
std::memset(seed_material, 0xAA, sizeof(seed_material));
EXPECT_TRUE(absl::random_internal::ReadSeedMaterialFromURBG(
&urbg, absl::Span<uint32_t>(seed_material, 0)));
EXPECT_THAT(seed_material, Each(Eq(0xAAAAAAAA)));
}
TEST(ReadSeedMaterialFromURBG, NullUrbgArgument) {
constexpr size_t kSeedMaterialSize = 32;
uint32_t seed_material[kSeedMaterialSize];
#ifdef NDEBUG
EXPECT_FALSE(absl::random_internal::ReadSeedMaterialFromURBG<std::mt19937_64>(
nullptr, absl::Span<uint32_t>(seed_material, kSeedMaterialSize)));
#else
bool result;
ABSL_EXPECT_DEATH_IF_SUPPORTED(
result = absl::random_internal::ReadSeedMaterialFromURBG<std::mt19937_64>(
nullptr, absl::Span<uint32_t>(seed_material, kSeedMaterialSize)),
"!= nullptr");
(void)result; // suppress unused-variable warning
#endif
}
TEST(ReadSeedMaterialFromURBG, NullPtrVectorArgument) {
std::mt19937_64 urbg;
#ifdef NDEBUG
EXPECT_FALSE(absl::random_internal::ReadSeedMaterialFromURBG(
&urbg, absl::Span<uint32_t>(nullptr, 32)));
#else
bool result;
ABSL_EXPECT_DEATH_IF_SUPPORTED(
result = absl::random_internal::ReadSeedMaterialFromURBG(
&urbg, absl::Span<uint32_t>(nullptr, 32)),
"!= nullptr");
(void)result; // suppress unused-variable warning
#endif
}
// The avalanche effect is a desirable cryptographic property of hashes in which
// changing a single bit in the input causes each bit of the output to be
// changed with probability near 50%.
//
// https://en.wikipedia.org/wiki/Avalanche_effect
TEST(MixSequenceIntoSeedMaterial, AvalancheEffectTestOneBitLong) {
std::vector<uint32_t> seed_material = {1, 2, 3, 4, 5, 6, 7, 8};
// For every 32-bit number with exactly one bit set, verify the avalanche
// effect holds. In order to reduce flakiness of tests, accept values
// anywhere in the range of 30%-70%.
for (uint32_t v = 1; v != 0; v <<= 1) {
std::vector<uint32_t> seed_material_copy = seed_material;
absl::random_internal::MixIntoSeedMaterial(
absl::Span<uint32_t>(&v, 1),
absl::Span<uint32_t>(seed_material_copy.data(),
seed_material_copy.size()));
uint32_t changed_bits = 0;
for (size_t i = 0; i < seed_material.size(); i++) {
std::bitset<sizeof(uint32_t) * 8> bitset(seed_material[i] ^
seed_material_copy[i]);
changed_bits += bitset.count();
}
EXPECT_LE(changed_bits, 0.7 * sizeof(uint32_t) * 8 * seed_material.size());
EXPECT_GE(changed_bits, 0.3 * sizeof(uint32_t) * 8 * seed_material.size());
}
}
TEST(MixSequenceIntoSeedMaterial, AvalancheEffectTestOneBitShort) {
std::vector<uint32_t> seed_material = {1};
// For every 32-bit number with exactly one bit set, verify the avalanche
// effect holds. In order to reduce flakiness of tests, accept values
// anywhere in the range of 30%-70%.
for (uint32_t v = 1; v != 0; v <<= 1) {
std::vector<uint32_t> seed_material_copy = seed_material;
absl::random_internal::MixIntoSeedMaterial(
absl::Span<uint32_t>(&v, 1),
absl::Span<uint32_t>(seed_material_copy.data(),
seed_material_copy.size()));
uint32_t changed_bits = 0;
for (size_t i = 0; i < seed_material.size(); i++) {
std::bitset<sizeof(uint32_t) * 8> bitset(seed_material[i] ^
seed_material_copy[i]);
changed_bits += bitset.count();
}
EXPECT_LE(changed_bits, 0.7 * sizeof(uint32_t) * 8 * seed_material.size());
EXPECT_GE(changed_bits, 0.3 * sizeof(uint32_t) * 8 * seed_material.size());
}
}
} // namespace