Export of internal Abseil changes

--
30bbe72e8c32d8680bbe6c8473a884d485e9f684 by Laramie Leavitt <lar@google.com>:

Convert randen golden test to use byte arrays.

PiperOrigin-RevId: 404948438

--
4690d9ebd2c518708ad155e913b2140ebdf01234 by Laramie Leavitt <lar@google.com>:

Add golden tests for internal::ExplicitSeedSeeq against stable std:: random URBGs.

PiperOrigin-RevId: 404912608

--
52e9b24276ee3a21cc8a026f9d152ef8ced7f507 by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 404861043

--
9e966a2a680970fd27d927cc6420e333b1378b1e by Abseil Team <absl-team@google.com>:

Roll back import of CCTZ from GitHub.

PiperOrigin-RevId: 404343587

--
9c4eedec00105b8288c0b91d96434aea08b8e3c3 by Abseil Team <absl-team@google.com>:

Import of CCTZ from GitHub.

PiperOrigin-RevId: 404314597

--
f171375fd7bec35cc34815be8faf5e000828b7bb by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 404098156
GitOrigin-RevId: 30bbe72e8c32d8680bbe6c8473a884d485e9f684
Change-Id: Ic7b5a3c0659e321e2f642800930a8de014253e2a

3 files changed, 94 insertions, 71 deletions

diff --git a/absl/random/internal/explicit_seed_seq_test.cc b/absl/random/internal/explicit_seed_seq_test.cc
index a55ad739..f867f610 100644
--- a/absl/random/internal/explicit_seed_seq_test.cc
+++ b/absl/random/internal/explicit_seed_seq_test.cc
@@ -24,6 +24,8 @@
 
 namespace {
 
+using ::absl::random_internal::ExplicitSeedSeq;
+
 template <typename Sseq>
 bool ConformsToInterface() {
   // Check that the SeedSequence can be default-constructed.
@@ -64,14 +66,14 @@ TEST(SeedSequences, CheckInterfaces) {
   EXPECT_TRUE(ConformsToInterface<std::seed_seq>());
 
   // Abseil classes
-  EXPECT_TRUE(ConformsToInterface<absl::random_internal::ExplicitSeedSeq>());
+  EXPECT_TRUE(ConformsToInterface<ExplicitSeedSeq>());
 }
 
 TEST(ExplicitSeedSeq, DefaultConstructorGeneratesZeros) {
   const size_t kNumBlocks = 128;
 
   uint32_t outputs[kNumBlocks];
-  absl::random_internal::ExplicitSeedSeq seq;
+  ExplicitSeedSeq seq;
   seq.generate(outputs, &outputs[kNumBlocks]);
 
   for (uint32_t& seed : outputs) {
@@ -87,8 +89,7 @@ TEST(ExplicitSeeqSeq, SeedMaterialIsForwardedIdentically) {
   for (uint32_t& seed : seed_material) {
     seed = urandom();
   }
-  absl::random_internal::ExplicitSeedSeq seq(seed_material,
-                                             &seed_material[kNumBlocks]);
+  ExplicitSeedSeq seq(seed_material, &seed_material[kNumBlocks]);
 
   // Check that output is same as seed-material provided to constructor.
   {
@@ -133,11 +134,10 @@ TEST(ExplicitSeedSeq, CopyAndMoveConstructors) {
   for (uint32_t& entry : entropy) {
     entry = urandom();
   }
-  absl::random_internal::ExplicitSeedSeq seq_from_entropy(std::begin(entropy),
-                                                          std::end(entropy));
+  ExplicitSeedSeq seq_from_entropy(std::begin(entropy), std::end(entropy));
   // Copy constructor.
   {
-    absl::random_internal::ExplicitSeedSeq seq_copy(seq_from_entropy);
+    ExplicitSeedSeq seq_copy(seq_from_entropy);
     EXPECT_EQ(seq_copy.size(), seq_from_entropy.size());
 
     std::vector<uint32_t> seeds_1;
@@ -155,8 +155,7 @@ TEST(ExplicitSeedSeq, CopyAndMoveConstructors) {
     for (uint32_t& entry : entropy) {
       entry = urandom();
     }
-    absl::random_internal::ExplicitSeedSeq another_seq(std::begin(entropy),
-                                                       std::end(entropy));
+    ExplicitSeedSeq another_seq(std::begin(entropy), std::end(entropy));
 
     std::vector<uint32_t> seeds_1;
     seeds_1.resize(1000, 0);
@@ -202,3 +201,35 @@ TEST(ExplicitSeedSeq, CopyAndMoveConstructors) {
     EXPECT_THAT(seeds_1, Each(Eq(0)));
   }
 }
+
+TEST(ExplicitSeedSeq, StdURBGGoldenTests) {
+  // Verify that for std::- URBG instances the results are stable across
+  // platforms (these should have deterministic output).
+  {
+    ExplicitSeedSeq seed_sequence{12, 34, 56};
+    std::minstd_rand rng(seed_sequence);
+
+    std::minstd_rand::result_type values[4] = {rng(), rng(), rng(), rng()};
+    EXPECT_THAT(values,
+                testing::ElementsAre(579252, 43785881, 464353103, 1501811174));
+  }
+
+  {
+    ExplicitSeedSeq seed_sequence{12, 34, 56};
+    std::mt19937 rng(seed_sequence);
+
+    std::mt19937::result_type values[4] = {rng(), rng(), rng(), rng()};
+    EXPECT_THAT(values, testing::ElementsAre(138416803, 151130212, 33817739,
+                                             138416803));
+  }
+
+  {
+    ExplicitSeedSeq seed_sequence{12, 34, 56};
+    std::mt19937_64 rng(seed_sequence);
+
+    std::mt19937_64::result_type values[4] = {rng(), rng(), rng(), rng()};
+    EXPECT_THAT(values,
+                testing::ElementsAre(19738651785169348, 1464811352364190456,
+                                     18054685302720800, 19738651785169348));
+  }
+}
diff --git a/absl/random/internal/randen_hwaes_test.cc b/absl/random/internal/randen_hwaes_test.cc
index 66ddb43f..2348b55c 100644
--- a/absl/random/internal/randen_hwaes_test.cc
+++ b/absl/random/internal/randen_hwaes_test.cc
@@ -27,44 +27,39 @@ namespace {
 using absl::random_internal::RandenHwAes;
 using absl::random_internal::RandenTraits;
 
-// Local state parameters.
-constexpr size_t kSeedBytes =
-    RandenTraits::kStateBytes - RandenTraits::kCapacityBytes;
-constexpr size_t kStateSizeT = RandenTraits::kStateBytes / sizeof(uint64_t);
-constexpr size_t kSeedSizeT = kSeedBytes / sizeof(uint32_t);
-
-struct alignas(16) randen {
-  uint64_t state[kStateSizeT];
-  uint32_t seed[kSeedSizeT];
-};
-
 TEST(RandenHwAesTest, Default) {
   EXPECT_TRUE(absl::random_internal::CPUSupportsRandenHwAes());
 
-  constexpr uint64_t kGolden[] = {
-      0x6c6534090ee6d3ee, 0x044e2b9b9d5333c6, 0xc3c14f134e433977,
-      0xdda9f47cd90410ee, 0x887bf3087fd8ca10, 0xf0b780f545c72912,
-      0x15dbb1d37696599f, 0x30ec63baff3c6d59, 0xb29f73606f7f20a6,
-      0x02808a316f49a54c, 0x3b8feaf9d5c8e50e, 0x9cbf605e3fd9de8a,
-      0xc970ae1a78183bbb, 0xd8b2ffd356301ed5, 0xf4b327fe0fc73c37,
-      0xcdfd8d76eb8f9a19, 0xc3a506eb91420c9d, 0xd5af05dd3eff9556,
-      0x48db1bb78f83c4a1, 0x7023920e0d6bfe8c, 0x58d3575834956d42,
-      0xed1ef4c26b87b840, 0x8eef32a23e0b2df3, 0x497cabf3431154fc,
-      0x4e24370570029a8b, 0xd88b5749f090e5ea, 0xc651a582a970692f,
-      0x78fcec2cbb6342f5, 0x463cb745612f55db, 0x352ee4ad1816afe3,
-      0x026ff374c101da7e, 0x811ef0821c3de851,
+  constexpr uint8_t kGolden[] = {
+      0xee, 0xd3, 0xe6, 0x0e, 0x09, 0x34, 0x65, 0x6c, 0xc6, 0x33, 0x53, 0x9d,
+      0x9b, 0x2b, 0x4e, 0x04, 0x77, 0x39, 0x43, 0x4e, 0x13, 0x4f, 0xc1, 0xc3,
+      0xee, 0x10, 0x04, 0xd9, 0x7c, 0xf4, 0xa9, 0xdd, 0x10, 0xca, 0xd8, 0x7f,
+      0x08, 0xf3, 0x7b, 0x88, 0x12, 0x29, 0xc7, 0x45, 0xf5, 0x80, 0xb7, 0xf0,
+      0x9f, 0x59, 0x96, 0x76, 0xd3, 0xb1, 0xdb, 0x15, 0x59, 0x6d, 0x3c, 0xff,
+      0xba, 0x63, 0xec, 0x30, 0xa6, 0x20, 0x7f, 0x6f, 0x60, 0x73, 0x9f, 0xb2,
+      0x4c, 0xa5, 0x49, 0x6f, 0x31, 0x8a, 0x80, 0x02, 0x0e, 0xe5, 0xc8, 0xd5,
+      0xf9, 0xea, 0x8f, 0x3b, 0x8a, 0xde, 0xd9, 0x3f, 0x5e, 0x60, 0xbf, 0x9c,
+      0xbb, 0x3b, 0x18, 0x78, 0x1a, 0xae, 0x70, 0xc9, 0xd5, 0x1e, 0x30, 0x56,
+      0xd3, 0xff, 0xb2, 0xd8, 0x37, 0x3c, 0xc7, 0x0f, 0xfe, 0x27, 0xb3, 0xf4,
+      0x19, 0x9a, 0x8f, 0xeb, 0x76, 0x8d, 0xfd, 0xcd, 0x9d, 0x0c, 0x42, 0x91,
+      0xeb, 0x06, 0xa5, 0xc3, 0x56, 0x95, 0xff, 0x3e, 0xdd, 0x05, 0xaf, 0xd5,
+      0xa1, 0xc4, 0x83, 0x8f, 0xb7, 0x1b, 0xdb, 0x48, 0x8c, 0xfe, 0x6b, 0x0d,
+      0x0e, 0x92, 0x23, 0x70, 0x42, 0x6d, 0x95, 0x34, 0x58, 0x57, 0xd3, 0x58,
+      0x40, 0xb8, 0x87, 0x6b, 0xc2, 0xf4, 0x1e, 0xed, 0xf3, 0x2d, 0x0b, 0x3e,
+      0xa2, 0x32, 0xef, 0x8e, 0xfc, 0x54, 0x11, 0x43, 0xf3, 0xab, 0x7c, 0x49,
+      0x8b, 0x9a, 0x02, 0x70, 0x05, 0x37, 0x24, 0x4e, 0xea, 0xe5, 0x90, 0xf0,
+      0x49, 0x57, 0x8b, 0xd8, 0x2f, 0x69, 0x70, 0xa9, 0x82, 0xa5, 0x51, 0xc6,
+      0xf5, 0x42, 0x63, 0xbb, 0x2c, 0xec, 0xfc, 0x78, 0xdb, 0x55, 0x2f, 0x61,
+      0x45, 0xb7, 0x3c, 0x46, 0xe3, 0xaf, 0x16, 0x18, 0xad, 0xe4, 0x2e, 0x35,
+      0x7e, 0xda, 0x01, 0xc1, 0x74, 0xf3, 0x6f, 0x02, 0x51, 0xe8, 0x3d, 0x1c,
+      0x82, 0xf0, 0x1e, 0x81,
   };
 
-  alignas(16) randen d;
-  memset(d.state, 0, sizeof(d.state));
-  RandenHwAes::Generate(RandenHwAes::GetKeys(), d.state);
+  alignas(16) uint8_t state[RandenTraits::kStateBytes];
+  std::memset(state, 0, sizeof(state));
 
-  uint64_t* id = d.state;
-  for (const auto& elem : kGolden) {
-    auto a = absl::StrFormat("%#x", elem);
-    auto b = absl::StrFormat("%#x", *id++);
-    EXPECT_EQ(a, b);
-  }
+  RandenHwAes::Generate(RandenHwAes::GetKeys(), state);
+  EXPECT_EQ(0, std::memcmp(state, kGolden, sizeof(state)));
 }
 
 }  // namespace
diff --git a/absl/random/internal/randen_slow_test.cc b/absl/random/internal/randen_slow_test.cc
index 4861ffa4..ed603958 100644
--- a/absl/random/internal/randen_slow_test.cc
+++ b/absl/random/internal/randen_slow_test.cc
@@ -25,40 +25,37 @@ namespace {
 using absl::random_internal::RandenSlow;
 using absl::random_internal::RandenTraits;
 
-// Local state parameters.
-constexpr size_t kSeedBytes =
-    RandenTraits::kStateBytes - RandenTraits::kCapacityBytes;
-constexpr size_t kStateSizeT = RandenTraits::kStateBytes / sizeof(uint64_t);
-constexpr size_t kSeedSizeT = kSeedBytes / sizeof(uint32_t);
-
-struct alignas(16) randen {
-  uint64_t state[kStateSizeT];
-  uint32_t seed[kSeedSizeT];
-};
-
 TEST(RandenSlowTest, Default) {
-  constexpr uint64_t kGolden[] = {
-      0x6c6534090ee6d3ee, 0x044e2b9b9d5333c6, 0xc3c14f134e433977,
-      0xdda9f47cd90410ee, 0x887bf3087fd8ca10, 0xf0b780f545c72912,
-      0x15dbb1d37696599f, 0x30ec63baff3c6d59, 0xb29f73606f7f20a6,
-      0x02808a316f49a54c, 0x3b8feaf9d5c8e50e, 0x9cbf605e3fd9de8a,
-      0xc970ae1a78183bbb, 0xd8b2ffd356301ed5, 0xf4b327fe0fc73c37,
-      0xcdfd8d76eb8f9a19, 0xc3a506eb91420c9d, 0xd5af05dd3eff9556,
-      0x48db1bb78f83c4a1, 0x7023920e0d6bfe8c, 0x58d3575834956d42,
-      0xed1ef4c26b87b840, 0x8eef32a23e0b2df3, 0x497cabf3431154fc,
-      0x4e24370570029a8b, 0xd88b5749f090e5ea, 0xc651a582a970692f,
-      0x78fcec2cbb6342f5, 0x463cb745612f55db, 0x352ee4ad1816afe3,
-      0x026ff374c101da7e, 0x811ef0821c3de851,
+  constexpr uint8_t kGolden[] = {
+      0xee, 0xd3, 0xe6, 0x0e, 0x09, 0x34, 0x65, 0x6c, 0xc6, 0x33, 0x53, 0x9d,
+      0x9b, 0x2b, 0x4e, 0x04, 0x77, 0x39, 0x43, 0x4e, 0x13, 0x4f, 0xc1, 0xc3,
+      0xee, 0x10, 0x04, 0xd9, 0x7c, 0xf4, 0xa9, 0xdd, 0x10, 0xca, 0xd8, 0x7f,
+      0x08, 0xf3, 0x7b, 0x88, 0x12, 0x29, 0xc7, 0x45, 0xf5, 0x80, 0xb7, 0xf0,
+      0x9f, 0x59, 0x96, 0x76, 0xd3, 0xb1, 0xdb, 0x15, 0x59, 0x6d, 0x3c, 0xff,
+      0xba, 0x63, 0xec, 0x30, 0xa6, 0x20, 0x7f, 0x6f, 0x60, 0x73, 0x9f, 0xb2,
+      0x4c, 0xa5, 0x49, 0x6f, 0x31, 0x8a, 0x80, 0x02, 0x0e, 0xe5, 0xc8, 0xd5,
+      0xf9, 0xea, 0x8f, 0x3b, 0x8a, 0xde, 0xd9, 0x3f, 0x5e, 0x60, 0xbf, 0x9c,
+      0xbb, 0x3b, 0x18, 0x78, 0x1a, 0xae, 0x70, 0xc9, 0xd5, 0x1e, 0x30, 0x56,
+      0xd3, 0xff, 0xb2, 0xd8, 0x37, 0x3c, 0xc7, 0x0f, 0xfe, 0x27, 0xb3, 0xf4,
+      0x19, 0x9a, 0x8f, 0xeb, 0x76, 0x8d, 0xfd, 0xcd, 0x9d, 0x0c, 0x42, 0x91,
+      0xeb, 0x06, 0xa5, 0xc3, 0x56, 0x95, 0xff, 0x3e, 0xdd, 0x05, 0xaf, 0xd5,
+      0xa1, 0xc4, 0x83, 0x8f, 0xb7, 0x1b, 0xdb, 0x48, 0x8c, 0xfe, 0x6b, 0x0d,
+      0x0e, 0x92, 0x23, 0x70, 0x42, 0x6d, 0x95, 0x34, 0x58, 0x57, 0xd3, 0x58,
+      0x40, 0xb8, 0x87, 0x6b, 0xc2, 0xf4, 0x1e, 0xed, 0xf3, 0x2d, 0x0b, 0x3e,
+      0xa2, 0x32, 0xef, 0x8e, 0xfc, 0x54, 0x11, 0x43, 0xf3, 0xab, 0x7c, 0x49,
+      0x8b, 0x9a, 0x02, 0x70, 0x05, 0x37, 0x24, 0x4e, 0xea, 0xe5, 0x90, 0xf0,
+      0x49, 0x57, 0x8b, 0xd8, 0x2f, 0x69, 0x70, 0xa9, 0x82, 0xa5, 0x51, 0xc6,
+      0xf5, 0x42, 0x63, 0xbb, 0x2c, 0xec, 0xfc, 0x78, 0xdb, 0x55, 0x2f, 0x61,
+      0x45, 0xb7, 0x3c, 0x46, 0xe3, 0xaf, 0x16, 0x18, 0xad, 0xe4, 0x2e, 0x35,
+      0x7e, 0xda, 0x01, 0xc1, 0x74, 0xf3, 0x6f, 0x02, 0x51, 0xe8, 0x3d, 0x1c,
+      0x82, 0xf0, 0x1e, 0x81,
   };
 
-  alignas(16) randen d;
-  std::memset(d.state, 0, sizeof(d.state));
-  RandenSlow::Generate(RandenSlow::GetKeys(), d.state);
+  alignas(16) uint8_t state[RandenTraits::kStateBytes];
+  std::memset(state, 0, sizeof(state));
 
-  uint64_t* id = d.state;
-  for (const auto& elem : kGolden) {
-    EXPECT_EQ(absl::little_endian::FromHost64(elem), *id++);
-  }
+  RandenSlow::Generate(RandenSlow::GetKeys(), state);
+  EXPECT_EQ(0, std::memcmp(state, kGolden, sizeof(state)));
 }
 
 }  // namespace