crypto_util.cc

#include "crypto/crypto_util.h"
#include "async_wrap-inl.h"
#include "crypto/crypto_bio.h"
#include "crypto/crypto_keys.h"
#include "env-inl.h"
#include "memory_tracker-inl.h"
#include "ncrypto.h"
#include "node_buffer.h"
#include "node_options-inl.h"
#include "string_bytes.h"
#include "threadpoolwork-inl.h"
#include "util-inl.h"
#include "v8.h"

#ifndef OPENSSL_NO_ENGINE
#include <openssl/engine.h>
#endif  // !OPENSSL_NO_ENGINE

#include "math.h"

#if OPENSSL_VERSION_MAJOR >= 3
#include "openssl/provider.h"
#endif

#include <openssl/rand.h>

namespace node {

using ncrypto::BignumPointer;
using ncrypto::BIOPointer;
using ncrypto::CryptoErrorList;
using ncrypto::DataPointer;
using ncrypto::EnginePointer;
using ncrypto::EVPKeyCtxPointer;
using ncrypto::SSLCtxPointer;
using ncrypto::SSLPointer;
using v8::ArrayBuffer;
using v8::BackingStore;
using v8::BigInt;
using v8::Context;
using v8::Exception;
using v8::FunctionCallbackInfo;
using v8::HandleScope;
using v8::Isolate;
using v8::JustVoid;
using v8::Local;
using v8::LocalVector;
using v8::Maybe;
using v8::MaybeLocal;
using v8::NewStringType;
using v8::Nothing;
using v8::Object;
using v8::String;
using v8::TryCatch;
using v8::Uint32;
using v8::Uint8Array;
using v8::Value;

namespace crypto {

int PasswordCallback(char* buf, int size, int rwflag, void* u) {
  const ByteSource* passphrase = *static_cast<const ByteSource**>(u);
  if (passphrase != nullptr) {
    size_t buflen = static_cast<size_t>(size);
    size_t len = passphrase->size();
    if (buflen < len)
      return -1;
    memcpy(buf, passphrase->data(), len);
    return len;
  }

  return -1;
}

// This callback is used to avoid the default passphrase callback in OpenSSL
// which will typically prompt for the passphrase. The prompting is designed
// for the OpenSSL CLI, but works poorly for Node.js because it involves
// synchronous interaction with the controlling terminal, something we never
// want, and use this function to avoid it.
int NoPasswordCallback(char* buf, int size, int rwflag, void* u) {
  return 0;
}

bool ProcessFipsOptions() {
  /* Override FIPS settings in configuration file, if needed. */
  if (per_process::cli_options->enable_fips_crypto ||
      per_process::cli_options->force_fips_crypto) {
#if OPENSSL_VERSION_MAJOR >= 3
    OSSL_PROVIDER* fips_provider = OSSL_PROVIDER_load(nullptr, "fips");
    if (fips_provider == nullptr)
      return false;
    OSSL_PROVIDER_unload(fips_provider);

    return EVP_default_properties_enable_fips(nullptr, 1) &&
           EVP_default_properties_is_fips_enabled(nullptr);
#else
    if (FIPS_mode() == 0) return FIPS_mode_set(1);

#endif
  }
  return true;
}

bool InitCryptoOnce(Isolate* isolate) {
  static uv_once_t init_once = UV_ONCE_INIT;
  TryCatch try_catch{isolate};
  uv_once(&init_once, InitCryptoOnce);
  if (try_catch.HasCaught() && !try_catch.HasTerminated()) {
    try_catch.ReThrow();
    return false;
  }
  return true;
}

// Protect accesses to FIPS state with a mutex. This should potentially
// be part of a larger mutex for global OpenSSL state.
static Mutex fips_mutex;

void InitCryptoOnce() {
  Mutex::ScopedLock lock(per_process::cli_options_mutex);
  Mutex::ScopedLock fips_lock(fips_mutex);
#ifndef OPENSSL_IS_BORINGSSL
  OPENSSL_INIT_SETTINGS* settings = OPENSSL_INIT_new();

#if OPENSSL_VERSION_MAJOR < 3
  // --openssl-config=...
  if (!per_process::cli_options->openssl_config.empty()) {
    const char* conf = per_process::cli_options->openssl_config.c_str();
    OPENSSL_INIT_set_config_filename(settings, conf);
  }
#endif

#if OPENSSL_VERSION_MAJOR >= 3
  // --openssl-legacy-provider
  if (per_process::cli_options->openssl_legacy_provider) {
    OSSL_PROVIDER* legacy_provider = OSSL_PROVIDER_load(nullptr, "legacy");
    if (legacy_provider == nullptr) {
      fprintf(stderr, "Unable to load legacy provider.\n");
    }
  }
#endif

  OPENSSL_init_ssl(0, settings);
  OPENSSL_INIT_free(settings);
  settings = nullptr;

#ifndef _WIN32
  if (per_process::cli_options->secure_heap != 0) {
    switch (CRYPTO_secure_malloc_init(
                per_process::cli_options->secure_heap,
                static_cast<int>(per_process::cli_options->secure_heap_min))) {
      case 0:
        fprintf(stderr, "Unable to initialize openssl secure heap.\n");
        break;
      case 2:
        // Not a fatal error but worthy of a warning.
        fprintf(stderr, "Unable to memory map openssl secure heap.\n");
        break;
      case 1:
        // OK!
        break;
    }
  }
#endif

#endif  // OPENSSL_IS_BORINGSSL

  // Turn off compression. Saves memory and protects against CRIME attacks.
  // No-op with OPENSSL_NO_COMP builds of OpenSSL.
  sk_SSL_COMP_zero(SSL_COMP_get_compression_methods());

#ifndef OPENSSL_NO_ENGINE
  EnginePointer::initEnginesOnce();
#endif  // !OPENSSL_NO_ENGINE
}

void GetFipsCrypto(const FunctionCallbackInfo<Value>& args) {
  Mutex::ScopedLock lock(per_process::cli_options_mutex);
  Mutex::ScopedLock fips_lock(fips_mutex);
  args.GetReturnValue().Set(ncrypto::isFipsEnabled() ? 1 : 0);
}

void SetFipsCrypto(const FunctionCallbackInfo<Value>& args) {
  Mutex::ScopedLock lock(per_process::cli_options_mutex);
  Mutex::ScopedLock fips_lock(fips_mutex);

  CHECK(!per_process::cli_options->force_fips_crypto);
  Environment* env = Environment::GetCurrent(args);
  CHECK(env->owns_process_state());
  bool enable = args[0]->BooleanValue(env->isolate());

  CryptoErrorList errors;
  if (!ncrypto::setFipsEnabled(enable, &errors)) {
    Local<Value> exception;
    if (cryptoErrorListToException(env, errors).ToLocal(&exception)) {
      env->isolate()->ThrowException(exception);
    }
  }
}

void TestFipsCrypto(const v8::FunctionCallbackInfo<v8::Value>& args) {
  Mutex::ScopedLock lock(per_process::cli_options_mutex);
  Mutex::ScopedLock fips_lock(fips_mutex);
  args.GetReturnValue().Set(ncrypto::testFipsEnabled() ? 1 : 0);
}

void GetOpenSSLSecLevelCrypto(const FunctionCallbackInfo<Value>& args) {
  // for BoringSSL assume the same as the default
  int sec_level = OPENSSL_TLS_SECURITY_LEVEL;
#ifndef OPENSSL_IS_BORINGSSL
  Environment* env = Environment::GetCurrent(args);

  auto ctx = SSLCtxPointer::New();
  if (!ctx) {
    return ThrowCryptoError(env, ERR_get_error(), "SSL_CTX_new");
  }

  auto ssl = SSLPointer::New(ctx);
  if (!ssl) {
    return ThrowCryptoError(env, ERR_get_error(), "SSL_new");
  }

  sec_level = SSL_get_security_level(ssl);
#endif  // OPENSSL_IS_BORINGSSL
  args.GetReturnValue().Set(sec_level);
}

void CryptoErrorStore::Capture() {
  errors_.clear();
  while (const uint32_t err = ERR_get_error()) {
    char buf[256];
    ERR_error_string_n(err, buf, sizeof(buf));
    errors_.emplace_back(buf);
  }
  std::reverse(std::begin(errors_), std::end(errors_));
}

bool CryptoErrorStore::Empty() const {
  return errors_.empty();
}

MaybeLocal<Value> cryptoErrorListToException(Environment* env,
                                             const CryptoErrorList& errors) {
  // The CryptoErrorList contains a listing of zero or more errors.
  // If there are no errors, it is likely a bug but we will return
  // an error anyway.
  if (errors.empty()) {
    return Exception::Error(FIXED_ONE_BYTE_STRING(env->isolate(), "Ok"));
  }

  // The last error in the list is the one that will be used as the
  // error message. All other errors will be added to the .opensslErrorStack
  // property. We know there has to be at least one error in the list at
  // this point.
  auto& last = errors.peek_back();
  Local<String> message;
  if (!String::NewFromUtf8(
           env->isolate(), last.data(), NewStringType::kNormal, last.size())
           .ToLocal(&message)) {
    return {};
  }

  Local<Value> exception = Exception::Error(message);
  CHECK(!exception.IsEmpty());

  if (errors.size() > 1) {
    CHECK(exception->IsObject());
    Local<Object> exception_obj = exception.As<Object>();
    LocalVector<Value> stack(env->isolate());
    stack.reserve(errors.size() - 1);

    // Iterate over all but the last error in the list.
    auto current = errors.begin();
    auto last = errors.end();
    last--;
    while (current != last) {
      Local<Value> error;
      if (!ToV8Value(env->context(), *current).ToLocal(&error)) {
        return {};
      }
      stack.push_back(error);
      ++current;
    }

    Local<v8::Array> stackArray =
        v8::Array::New(env->isolate(), stack.data(), stack.size());

    if (exception_obj
            ->Set(env->context(), env->openssl_error_stack(), stackArray)
            .IsNothing()) {
      return {};
    }
  }
  return exception;
}

MaybeLocal<Value> CryptoErrorStore::ToException(
    Environment* env,
    Local<String> exception_string) const {
  if (exception_string.IsEmpty()) {
    CryptoErrorStore copy(*this);
    if (copy.Empty()) {
      // But possibly a bug...
      copy.Insert(NodeCryptoError::OK);
    }
    // Use last element as the error message, everything else goes
    // into the .opensslErrorStack property on the exception object.
    const std::string& last_error_string = copy.errors_.back();
    Local<String> exception_string;
    if (!String::NewFromUtf8(
            env->isolate(),
            last_error_string.data(),
            NewStringType::kNormal,
            last_error_string.size()).ToLocal(&exception_string)) {
      return MaybeLocal<Value>();
    }
    copy.errors_.pop_back();
    return copy.ToException(env, exception_string);
  }

  Local<Value> exception_v = Exception::Error(exception_string);
  CHECK(!exception_v.IsEmpty());

  if (!Empty()) {
    CHECK(exception_v->IsObject());
    Local<Object> exception = exception_v.As<Object>();
    Local<Value> stack;
    if (!ToV8Value(env->context(), errors_).ToLocal(&stack) ||
        exception->Set(env->context(), env->openssl_error_stack(), stack)
            .IsNothing()) {
      return MaybeLocal<Value>();
    }
  }

  return exception_v;
}

ByteSource::ByteSource(ByteSource&& other) noexcept
    : data_(other.data_),
      allocated_data_(other.allocated_data_),
      size_(other.size_) {
  other.allocated_data_ = nullptr;
}

ByteSource::~ByteSource() {
  OPENSSL_clear_free(allocated_data_, size_);
}

ByteSource& ByteSource::operator=(ByteSource&& other) noexcept {
  if (&other != this) {
    OPENSSL_clear_free(allocated_data_, size_);
    data_ = other.data_;
    allocated_data_ = other.allocated_data_;
    other.allocated_data_ = nullptr;
    size_ = other.size_;
  }
  return *this;
}

std::unique_ptr<BackingStore> ByteSource::ReleaseToBackingStore() {
  // It's ok for allocated_data_ to be nullptr but
  // only if size_ is zero.
  CHECK_IMPLIES(size_ > 0, allocated_data_ != nullptr);
  std::unique_ptr<BackingStore> ptr = ArrayBuffer::NewBackingStore(
      allocated_data_,
      size(),
      [](void* data, size_t length, void* deleter_data) {
        OPENSSL_clear_free(deleter_data, length);
      }, allocated_data_);
  CHECK(ptr);
  allocated_data_ = nullptr;
  data_ = nullptr;
  size_ = 0;
  return ptr;
}

Local<ArrayBuffer> ByteSource::ToArrayBuffer(Environment* env) {
  std::unique_ptr<BackingStore> store = ReleaseToBackingStore();
  return ArrayBuffer::New(env->isolate(), std::move(store));
}

MaybeLocal<Uint8Array> ByteSource::ToBuffer(Environment* env) {
  Local<ArrayBuffer> ab = ToArrayBuffer(env);
  return Buffer::New(env, ab, 0, ab->ByteLength());
}

ByteSource ByteSource::FromBIO(const BIOPointer& bio) {
  CHECK(bio);
  BUF_MEM* bptr = bio;
  auto out = DataPointer::Alloc(bptr->length);
  memcpy(out.get(), bptr->data, bptr->length);
  return ByteSource::Allocated(out.release());
}

ByteSource ByteSource::FromEncodedString(Environment* env,
                                         Local<String> key,
                                         enum encoding enc) {
  size_t length = 0;
  ByteSource out;

  if (StringBytes::Size(env->isolate(), key, enc).To(&length) && length > 0) {
    auto buf = DataPointer::Alloc(length);
    size_t actual = StringBytes::Write(
        env->isolate(), static_cast<char*>(buf.get()), length, key, enc);
    out = ByteSource::Allocated(buf.resize(actual).release());
  }

  return out;
}

ByteSource ByteSource::FromStringOrBuffer(Environment* env,
                                          Local<Value> value) {
  return IsAnyBufferSource(value) ? FromBuffer(value)
                                  : FromString(env, value.As<String>());
}

ByteSource ByteSource::FromString(Environment* env, Local<String> str,
                                  bool ntc) {
  CHECK(str->IsString());
  size_t size = str->Utf8Length(env->isolate());
  size_t alloc_size = ntc ? size + 1 : size;
  auto out = DataPointer::Alloc(alloc_size);
  int opts = String::NO_OPTIONS;
  if (!ntc) opts |= String::NO_NULL_TERMINATION;
  str->WriteUtf8(
      env->isolate(), static_cast<char*>(out.get()), alloc_size, nullptr, opts);
  return ByteSource::Allocated(out.release());
}

ByteSource ByteSource::FromBuffer(Local<Value> buffer, bool ntc) {
  ArrayBufferOrViewContents<char> buf(buffer);
  return ntc ? buf.ToNullTerminatedCopy() : buf.ToByteSource();
}

ByteSource ByteSource::FromSecretKeyBytes(
    Environment* env,
    Local<Value> value) {
  // A key can be passed as a string, buffer or KeyObject with type 'secret'.
  // If it is a string, we need to convert it to a buffer. We are not doing that
  // in JS to avoid creating an unprotected copy on the heap.
  return value->IsString() || IsAnyBufferSource(value)
             ? ByteSource::FromStringOrBuffer(env, value)
             : ByteSource::FromSymmetricKeyObjectHandle(value);
}

ByteSource ByteSource::NullTerminatedCopy(Environment* env,
                                          Local<Value> value) {
  return Buffer::HasInstance(value) ? FromBuffer(value, true)
                                    : FromString(env, value.As<String>(), true);
}

ByteSource ByteSource::FromSymmetricKeyObjectHandle(Local<Value> handle) {
  CHECK(handle->IsObject());
  KeyObjectHandle* key =
      BaseObject::Unwrap<KeyObjectHandle>(handle.As<Object>());
  CHECK_NOT_NULL(key);
  return Foreign(key->Data().GetSymmetricKey(),
                 key->Data().GetSymmetricKeySize());
}

ByteSource ByteSource::Allocated(void* data, size_t size) {
  return ByteSource(data, data, size);
}

ByteSource ByteSource::Foreign(const void* data, size_t size) {
  return ByteSource(data, nullptr, size);
}

namespace error {
Maybe<void> Decorate(Environment* env,
                     Local<Object> obj,
                     unsigned long err) {  // NOLINT(runtime/int)
  if (err == 0) return JustVoid();         // No decoration necessary.

  const char* ls = ERR_lib_error_string(err);
  const char* fs = ERR_func_error_string(err);
  const char* rs = ERR_reason_error_string(err);

  Isolate* isolate = env->isolate();
  Local<Context> context = isolate->GetCurrentContext();

  if (ls != nullptr) {
    if (obj->Set(context, env->library_string(),
                 OneByteString(isolate, ls)).IsNothing()) {
      return Nothing<void>();
    }
  }
  if (fs != nullptr) {
    if (obj->Set(context, env->function_string(),
                 OneByteString(isolate, fs)).IsNothing()) {
      return Nothing<void>();
    }
  }
  if (rs != nullptr) {
    if (obj->Set(context, env->reason_string(),
                 OneByteString(isolate, rs)).IsNothing()) {
      return Nothing<void>();
    }

    // SSL has no API to recover the error name from the number, so we
    // transform reason strings like "this error" to "ERR_SSL_THIS_ERROR",
    // which ends up being close to the original error macro name.
    std::string reason(rs);

    for (auto& c : reason) {
      if (c == ' ')
        c = '_';
      else
        c = ToUpper(c);
    }

#define OSSL_ERROR_CODES_MAP(V)                                               \
    V(SYS)                                                                    \
    V(BN)                                                                     \
    V(RSA)                                                                    \
    V(DH)                                                                     \
    V(EVP)                                                                    \
    V(BUF)                                                                    \
    V(OBJ)                                                                    \
    V(PEM)                                                                    \
    V(DSA)                                                                    \
    V(X509)                                                                   \
    V(ASN1)                                                                   \
    V(CONF)                                                                   \
    V(CRYPTO)                                                                 \
    V(EC)                                                                     \
    V(SSL)                                                                    \
    V(BIO)                                                                    \
    V(PKCS7)                                                                  \
    V(X509V3)                                                                 \
    V(PKCS12)                                                                 \
    V(RAND)                                                                   \
    V(DSO)                                                                    \
    V(ENGINE)                                                                 \
    V(OCSP)                                                                   \
    V(UI)                                                                     \
    V(COMP)                                                                   \
    V(ECDSA)                                                                  \
    V(ECDH)                                                                   \
    V(OSSL_STORE)                                                             \
    V(FIPS)                                                                   \
    V(CMS)                                                                    \
    V(TS)                                                                     \
    V(HMAC)                                                                   \
    V(CT)                                                                     \
    V(ASYNC)                                                                  \
    V(KDF)                                                                    \
    V(SM2)                                                                    \
    V(USER)                                                                   \

#define V(name) case ERR_LIB_##name: lib = #name "_"; break;
    const char* lib = "";
    const char* prefix = "OSSL_";
    switch (ERR_GET_LIB(err)) { OSSL_ERROR_CODES_MAP(V) }
#undef V
#undef OSSL_ERROR_CODES_MAP
    // Don't generate codes like "ERR_OSSL_SSL_".
    if (lib && strcmp(lib, "SSL_") == 0)
      prefix = "";

    // All OpenSSL reason strings fit in a single 80-column macro definition,
    // all prefix lengths are <= 10, and ERR_OSSL_ is 9, so 128 is more than
    // sufficient.
    char code[128];
    snprintf(code, sizeof(code), "ERR_%s%s%s", prefix, lib, reason.c_str());

    if (obj->Set(env->isolate()->GetCurrentContext(),
             env->code_string(),
             OneByteString(env->isolate(), code)).IsNothing())
      return Nothing<void>();
  }

  return JustVoid();
}
}  // namespace error

void ThrowCryptoError(Environment* env,
                      unsigned long err,  // NOLINT(runtime/int)
                      // Default, only used if there is no SSL `err` which can
                      // be used to create a long-style message string.
                      const char* message) {
  char message_buffer[128] = {0};
  if (err != 0 || message == nullptr) {
    ERR_error_string_n(err, message_buffer, sizeof(message_buffer));
    message = message_buffer;
  }
  HandleScope scope(env->isolate());
  Local<String> exception_string;
  Local<Value> exception;
  Local<Object> obj;
  if (!String::NewFromUtf8(env->isolate(), message).ToLocal(&exception_string))
    return;
  CryptoErrorStore errors;
  errors.Capture();
  if (!errors.ToException(env, exception_string).ToLocal(&exception) ||
      !exception->ToObject(env->context()).ToLocal(&obj) ||
      error::Decorate(env, obj, err).IsNothing()) {
    return;
  }
  env->isolate()->ThrowException(exception);
}

#ifndef OPENSSL_NO_ENGINE
void SetEngine(const FunctionCallbackInfo<Value>& args) {
  Environment* env = Environment::GetCurrent(args);
  if (env->permission()->enabled()) [[unlikely]] {
    return THROW_ERR_CRYPTO_CUSTOM_ENGINE_NOT_SUPPORTED(
        env,
        "Programmatic selection of OpenSSL engines is unsupported while the "
        "experimental permission model is enabled");
  }

  CHECK(args.Length() >= 2 && args[0]->IsString());
  uint32_t flags;
  if (!args[1]->Uint32Value(env->context()).To(&flags)) return;

  const node::Utf8Value engine_id(env->isolate(), args[0]);
  // If the engine name is not known, calling setAsDefault on the
  // empty engine pointer will be non-op that always returns false.
  args.GetReturnValue().Set(
      EnginePointer::getEngineByName(engine_id.ToStringView())
          .setAsDefault(flags));
}
#endif  // !OPENSSL_NO_ENGINE

MaybeLocal<Value> EncodeBignum(
    Environment* env,
    const BIGNUM* bn,
    int size,
    Local<Value>* error) {
  auto buf = BignumPointer::EncodePadded(bn, size);
  CHECK_EQ(buf.size(), static_cast<size_t>(size));
  return StringBytes::Encode(env->isolate(),
                             reinterpret_cast<const char*>(buf.get()),
                             buf.size(),
                             BASE64URL,
                             error);
}

Maybe<void> SetEncodedValue(Environment* env,
                            Local<Object> target,
                            Local<String> name,
                            const BIGNUM* bn,
                            int size) {
  Local<Value> value;
  Local<Value> error;
  CHECK_NOT_NULL(bn);
  if (size == 0) size = BignumPointer::GetByteCount(bn);
  if (!EncodeBignum(env, bn, size, &error).ToLocal(&value)) {
    if (!error.IsEmpty())
      env->isolate()->ThrowException(error);
    return Nothing<void>();
  }
  return target->Set(env->context(), name, value).IsJust() ? JustVoid()
                                                           : Nothing<void>();
}

bool SetRsaOaepLabel(EVPKeyCtxPointer* ctx, const ByteSource& label) {
  if (label.size() != 0) {
    // OpenSSL takes ownership of the label, so we need to create a copy.
    auto dup = ncrypto::DataPointer::Copy(label);
    if (!dup) return false;
    return ctx->setRsaOaepLabel(std::move(dup));
  }
  return true;
}

CryptoJobMode GetCryptoJobMode(v8::Local<v8::Value> args) {
  CHECK(args->IsUint32());
  uint32_t mode = args.As<v8::Uint32>()->Value();
  CHECK_LE(mode, kCryptoJobSync);
  return static_cast<CryptoJobMode>(mode);
}

namespace {
// SecureBuffer uses OPENSSL_secure_malloc to allocate a Uint8Array.
// Without --secure-heap, OpenSSL's secure heap is disabled,
// in which case this has the same semantics as
// using OPENSSL_malloc. However, if the secure heap is
// initialized, SecureBuffer will automatically use it.
void SecureBuffer(const FunctionCallbackInfo<Value>& args) {
  CHECK(args[0]->IsUint32());
  Environment* env = Environment::GetCurrent(args);
  uint32_t len = args[0].As<Uint32>()->Value();
#ifndef OPENSSL_IS_BORINGSSL
  void* data = OPENSSL_secure_zalloc(len);
#else
  void* data = OPENSSL_malloc(len);
#endif
  if (data == nullptr) {
    // There's no memory available for the allocation.
    // Return nothing.
    return;
  }
#ifdef OPENSSL_IS_BORINGSSL
  memset(data, 0, len);
#endif
  std::shared_ptr<BackingStore> store =
      ArrayBuffer::NewBackingStore(
          data,
          len,
          [](void* data, size_t len, void* deleter_data) {
#ifndef OPENSSL_IS_BORINGSSL
            OPENSSL_secure_clear_free(data, len);
#else
        OPENSSL_clear_free(data, len);
#endif
          },
          data);
  Local<ArrayBuffer> buffer = ArrayBuffer::New(env->isolate(), store);
  args.GetReturnValue().Set(Uint8Array::New(buffer, 0, len));
}

void SecureHeapUsed(const FunctionCallbackInfo<Value>& args) {
#ifndef OPENSSL_IS_BORINGSSL
  Environment* env = Environment::GetCurrent(args);
  if (CRYPTO_secure_malloc_initialized())
    args.GetReturnValue().Set(
        BigInt::New(env->isolate(), CRYPTO_secure_used()));
#else
  // BoringSSL does not have the secure heap and therefore
  // will always return 0.
  args.GetReturnValue().Set(BigInt::New(args.GetIsolate(), 0));
#endif
}
}  // namespace

namespace Util {
void Initialize(Environment* env, Local<Object> target) {
  Local<Context> context = env->context();
#ifndef OPENSSL_NO_ENGINE
  SetMethod(context, target, "setEngine", SetEngine);
#endif  // !OPENSSL_NO_ENGINE

  SetMethodNoSideEffect(context, target, "getFipsCrypto", GetFipsCrypto);
  SetMethod(context, target, "setFipsCrypto", SetFipsCrypto);
  SetMethodNoSideEffect(context, target, "testFipsCrypto", TestFipsCrypto);

  NODE_DEFINE_CONSTANT(target, kCryptoJobAsync);
  NODE_DEFINE_CONSTANT(target, kCryptoJobSync);

  SetMethod(context, target, "secureBuffer", SecureBuffer);
  SetMethod(context, target, "secureHeapUsed", SecureHeapUsed);

  SetMethodNoSideEffect(
      context, target, "getOpenSSLSecLevelCrypto", GetOpenSSLSecLevelCrypto);
}
void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
#ifndef OPENSSL_NO_ENGINE
  registry->Register(SetEngine);
#endif  // !OPENSSL_NO_ENGINE

  registry->Register(GetFipsCrypto);
  registry->Register(SetFipsCrypto);
  registry->Register(TestFipsCrypto);
  registry->Register(SecureBuffer);
  registry->Register(SecureHeapUsed);
  registry->Register(GetOpenSSLSecLevelCrypto);
}

}  // namespace Util

}  // namespace crypto
}  // namespace node