#ifndef SRC_CRYPTO_CRYPTO_HKDF_H_

#define SRC_CRYPTO_CRYPTO_HKDF_H_

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#include "crypto/crypto_keys.h"

#include "crypto/crypto_util.h"

#include "allocated_buffer.h"

#include "async_wrap.h"

#include "base_object.h"

#include "v8.h"

namespace node {

namespace crypto {

static constexpr size_t kMaxDigestMultiplier = 255;

struct HKDFConfig final : public MemoryRetainer {

  CryptoJobMode mode;

  size_t length;

  const EVP_MD* digest;

  std::shared_ptr<KeyObjectData> key;

  ByteSource salt;

  ByteSource info;

  explicit HKDFConfig(HKDFConfig&& other) noexcept;

  HKDFConfig& operator=(HKDFConfig&& other) noexcept;

  void MemoryInfo(MemoryTracker* tracker) const override;

};

struct HKDFTraits final {

  using AdditionalParameters = HKDFConfig;

  static constexpr const char* JobName = "HKDFJob";

  static constexpr AsyncWrap::ProviderType Provider =

      AsyncWrap::PROVIDER_DERIVEBITSREQUEST;

  static v8::Maybe<bool> AdditionalConfig(

      CryptoJobMode mode,

      const v8::FunctionCallbackInfo<v8::Value>& args,

      unsigned int offset,

      HKDFConfig* params);

  static bool DeriveBits(

      Environment* env,

      const HKDFConfig& params,

      ByteSource* out);

  static v8::Maybe<bool> EncodeOutput(

      Environment* env,

      const HKDFConfig& params,

      ByteSource* out,

      v8::Local<v8::Value>* result);

};

using HKDFJob = DeriveBitsJob<HKDFTraits>;

}  // namespace crypto

}  // namespace node

#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#endif  // SRC_CRYPTO_CRYPTO_HKDF_H_