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-- 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
204 lines
5.6 KiB
C++
204 lines
5.6 KiB
C++
// Copyright 2017 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/random/internal/seed_material.h"
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#include <fcntl.h>
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#ifndef _WIN32
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#include <unistd.h>
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#else
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#include <io.h>
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#endif
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#include <algorithm>
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#include <cerrno>
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#include <cstdint>
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#include <cstdlib>
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#include <cstring>
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#include "absl/base/internal/raw_logging.h"
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#include "absl/strings/ascii.h"
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#include "absl/strings/escaping.h"
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#include "absl/strings/string_view.h"
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#include "absl/strings/strip.h"
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#if defined(__native_client__)
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#include <nacl/nacl_random.h>
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#define ABSL_RANDOM_USE_NACL_SECURE_RANDOM 1
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#elif defined(_WIN32)
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#include <windows.h>
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#define ABSL_RANDOM_USE_BCRYPT 1
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#pragma comment(lib, "bcrypt.lib")
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#endif
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#if defined(ABSL_RANDOM_USE_BCRYPT)
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#include <bcrypt.h>
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#ifndef BCRYPT_SUCCESS
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#define BCRYPT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0)
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#endif
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// Also link bcrypt; this can be done via linker options or:
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// #pragma comment(lib, "bcrypt.lib")
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#endif
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namespace absl {
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namespace random_internal {
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namespace {
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// Read OS Entropy for random number seeds.
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// TODO(absl-team): Possibly place a cap on how much entropy may be read at a
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// time.
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#if defined(ABSL_RANDOM_USE_BCRYPT)
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// On Windows potentially use the BCRYPT CNG API to read available entropy.
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bool ReadSeedMaterialFromOSEntropyImpl(absl::Span<uint32_t> values) {
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BCRYPT_ALG_HANDLE hProvider;
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NTSTATUS ret;
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ret = BCryptOpenAlgorithmProvider(&hProvider, BCRYPT_RNG_ALGORITHM,
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MS_PRIMITIVE_PROVIDER, 0);
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if (!(BCRYPT_SUCCESS(ret))) {
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ABSL_RAW_LOG(ERROR, "Failed to open crypto provider.");
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return false;
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}
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ret = BCryptGenRandom(
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hProvider, // provider
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reinterpret_cast<UCHAR*>(values.data()), // buffer
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static_cast<ULONG>(sizeof(uint32_t) * values.size()), // bytes
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0); // flags
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BCryptCloseAlgorithmProvider(hProvider, 0);
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return BCRYPT_SUCCESS(ret);
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}
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#elif defined(ABSL_RANDOM_USE_NACL_SECURE_RANDOM)
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// On NaCL use nacl_secure_random to acquire bytes.
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bool ReadSeedMaterialFromOSEntropyImpl(absl::Span<uint32_t> values) {
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auto buffer = reinterpret_cast<uint8_t*>(values.data());
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size_t buffer_size = sizeof(uint32_t) * values.size();
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uint8_t* output_ptr = buffer;
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while (buffer_size > 0) {
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size_t nread = 0;
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const int error = nacl_secure_random(output_ptr, buffer_size, &nread);
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if (error != 0 || nread > buffer_size) {
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ABSL_RAW_LOG(ERROR, "Failed to read secure_random seed data: %d", error);
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return false;
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}
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output_ptr += nread;
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buffer_size -= nread;
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}
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return true;
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}
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#else
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// On *nix, read entropy from /dev/urandom.
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bool ReadSeedMaterialFromOSEntropyImpl(absl::Span<uint32_t> values) {
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const char kEntropyFile[] = "/dev/urandom";
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auto buffer = reinterpret_cast<uint8_t*>(values.data());
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size_t buffer_size = sizeof(uint32_t) * values.size();
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int dev_urandom = open(kEntropyFile, O_RDONLY);
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bool success = (-1 != dev_urandom);
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if (!success) {
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return false;
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}
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while (success && buffer_size > 0) {
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int bytes_read = read(dev_urandom, buffer, buffer_size);
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int read_error = errno;
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success = (bytes_read > 0);
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if (success) {
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buffer += bytes_read;
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buffer_size -= bytes_read;
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} else if (bytes_read == -1 && read_error == EINTR) {
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success = true; // Need to try again.
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}
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}
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close(dev_urandom);
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return success;
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}
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#endif
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} // namespace
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bool ReadSeedMaterialFromOSEntropy(absl::Span<uint32_t> values) {
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assert(values.data() != nullptr);
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if (values.data() == nullptr) {
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return false;
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}
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if (values.empty()) {
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return true;
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}
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return ReadSeedMaterialFromOSEntropyImpl(values);
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}
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void MixIntoSeedMaterial(absl::Span<const uint32_t> sequence,
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absl::Span<uint32_t> seed_material) {
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// Algorithm is based on code available at
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// https://gist.github.com/imneme/540829265469e673d045
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constexpr uint32_t kInitVal = 0x43b0d7e5;
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constexpr uint32_t kHashMul = 0x931e8875;
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constexpr uint32_t kMixMulL = 0xca01f9dd;
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constexpr uint32_t kMixMulR = 0x4973f715;
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constexpr uint32_t kShiftSize = sizeof(uint32_t) * 8 / 2;
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uint32_t hash_const = kInitVal;
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auto hash = [&](uint32_t value) {
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value ^= hash_const;
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hash_const *= kHashMul;
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value *= hash_const;
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value ^= value >> kShiftSize;
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return value;
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};
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auto mix = [&](uint32_t x, uint32_t y) {
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uint32_t result = kMixMulL * x - kMixMulR * y;
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result ^= result >> kShiftSize;
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return result;
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};
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for (const auto& seq_val : sequence) {
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for (auto& elem : seed_material) {
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elem = mix(elem, hash(seq_val));
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}
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}
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}
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absl::optional<uint32_t> GetSaltMaterial() {
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// Salt must be common for all generators within the same process so read it
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// only once and store in static variable.
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static const auto salt_material = []() -> absl::optional<uint32_t> {
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uint32_t salt_value = 0;
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if (random_internal::ReadSeedMaterialFromOSEntropy(
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MakeSpan(&salt_value, 1))) {
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return salt_value;
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}
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return absl::nullopt;
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}();
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return salt_material;
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}
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} // namespace random_internal
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} // namespace absl
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