#include "crypto/crypto_timing.h"

#include "crypto/crypto_util.h"

#include "env-inl.h"

#include "node.h"

#include "node_debug.h"

#include "node_errors.h"

#include "v8.h"

#include <openssl/crypto.h>

namespace node {

using v8::CFunction;

using v8::FastApiCallbackOptions;

using v8::FunctionCallbackInfo;

using v8::HandleScope;

using v8::Local;

using v8::Object;

using v8::Value;

namespace crypto {

namespace Timing {

void TimingSafeEqual(const FunctionCallbackInfo<Value>& args) {

  // Moving the type checking into JS leads to test failures, most likely due

  // to V8 inlining certain parts of the wrapper. Therefore, keep them in C++.

  // Refs: https://github.com/nodejs/node/issues/34073.

  Environment* env = Environment::GetCurrent(args);

  if (!IsAnyBufferSource(args[0])) {

    THROW_ERR_INVALID_ARG_TYPE(

      env, "The \"buf1\" argument must be an instance of "

      "ArrayBuffer, Buffer, TypedArray, or DataView.");

    return;

  }

  if (!IsAnyBufferSource(args[1])) {

    THROW_ERR_INVALID_ARG_TYPE(

      env, "The \"buf2\" argument must be an instance of "

      "ArrayBuffer, Buffer, TypedArray, or DataView.");

    return;

  }

  ArrayBufferOrViewContents<char> buf1(args[0]);

  ArrayBufferOrViewContents<char> buf2(args[1]);

  if (buf1.size() != buf2.size()) {

    THROW_ERR_CRYPTO_TIMING_SAFE_EQUAL_LENGTH(env);

    return;

  }

  return args.GetReturnValue().Set(

      CRYPTO_memcmp(buf1.data(), buf2.data(), buf1.size()) == 0);

}

bool FastTimingSafeEqual(Local<Value> receiver,

                         Local<Value> a_obj,

                         Local<Value> b_obj,

                         // NOLINTNEXTLINE(runtime/references)

                         FastApiCallbackOptions& options) {

  HandleScope scope(options.isolate);

  ArrayBufferViewContents<uint8_t> a(a_obj);

  ArrayBufferViewContents<uint8_t> b(b_obj);

  if (a.length() != b.length()) {

    TRACK_V8_FAST_API_CALL("crypto.timingSafeEqual.error");

    THROW_ERR_CRYPTO_TIMING_SAFE_EQUAL_LENGTH(options.isolate);

    return false;

  }

  TRACK_V8_FAST_API_CALL("crypto.timingSafeEqual.ok");

  return CRYPTO_memcmp(a.data(), b.data(), a.length()) == 0;

}

static CFunction fast_timing_safe_equal(CFunction::Make(FastTimingSafeEqual));

void Initialize(Environment* env, Local<Object> target) {

  SetFastMethodNoSideEffect(env->context(),

                            target,

                            "timingSafeEqual",

                            TimingSafeEqual,

                            &fast_timing_safe_equal);

}

void RegisterExternalReferences(ExternalReferenceRegistry* registry) {

  registry->Register(TimingSafeEqual);

  registry->Register(fast_timing_safe_equal);

}

}  // namespace Timing

}  // namespace crypto

}  // namespace node