chromium/third_party/pdfium/core/fxcrt/fx_random.cpp

// Copyright 2017 The PDFium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#include "core/fxcrt/fx_random.h"

#include <array>

#include "build/build_config.h"
#include "core/fxcrt/fx_memory.h"
#include "core/fxcrt/fx_string.h"
#include "core/fxcrt/fx_system.h"

#define MT_N …
#define MT_M …
#define MT_Matrix_A …
#define MT_Upper_Mask …
#define MT_Lower_Mask …

#if BUILDFLAG(IS_WIN)
#include <wincrypt.h>
#else
#include <sys/time.h>
#include <unistd.h>
#endif

namespace {

struct MTContext { … };

bool g_bHaveGlobalSeed = …;
uint32_t g_nGlobalSeed = …;

#if BUILDFLAG(IS_WIN)
bool GenerateSeedFromCryptoRandom(uint32_t* pSeed) {
  HCRYPTPROV hCP = 0;
  if (!::CryptAcquireContext(&hCP, nullptr, nullptr, PROV_RSA_FULL, 0) ||
      !hCP) {
    return false;
  }
  ::CryptGenRandom(hCP, sizeof(uint32_t), reinterpret_cast<uint8_t*>(pSeed));
  ::CryptReleaseContext(hCP, 0);
  return true;
}
#endif

uint32_t GenerateSeedFromEnvironment() { … }

void* ContextFromNextGlobalSeed() { … }

}  // namespace

void* FX_Random_MT_Start(uint32_t dwSeed) { … }

uint32_t FX_Random_MT_Generate(void* pContext) { … }

void FX_Random_MT_Close(void* pContext) { … }

void FX_Random_GenerateMT(pdfium::span<uint32_t> pBuffer) { … }