#ifndef SRC_CRYPTO_CRYPTO_SCRYPT_H_

#define SRC_CRYPTO_CRYPTO_SCRYPT_H_

#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#include "crypto/crypto_util.h"

#include "env.h"

#include "memory_tracker.h"

#include "v8.h"

namespace node {

namespace crypto {

#ifndef OPENSSL_NO_SCRYPT

// Scrypt is a password-based key derivation algorithm

// defined in https://tools.ietf.org/html/rfc7914

// It takes as input a password, a salt value, and a

// handful of additional parameters that control the

// cost of the operation. In this case, the higher

// the cost, the better the result. The length parameter

// defines the number of bytes that are generated.

// The salt must be as random as possible and should be

// at least 16 bytes in length.

struct ScryptConfig final : public MemoryRetainer {

  CryptoJobMode mode;

  ByteSource pass;

  ByteSource salt;

  uint32_t N;

  uint32_t r;

  uint32_t p;

  uint64_t maxmem;

  int32_t length;

  ScryptConfig() = default;

  explicit ScryptConfig(ScryptConfig&& other) noexcept;

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

  void MemoryInfo(MemoryTracker* tracker) const override;

  SET_MEMORY_INFO_NAME(ScryptConfig)

  SET_SELF_SIZE(ScryptConfig)

};

struct ScryptTraits final {

  using AdditionalParameters = ScryptConfig;

  static constexpr const char* JobName = "ScryptJob";

  static constexpr AsyncWrap::ProviderType Provider =

      AsyncWrap::PROVIDER_SCRYPTREQUEST;

  static v8::Maybe<bool> AdditionalConfig(

      CryptoJobMode mode,

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

      unsigned int offset,

      ScryptConfig* params);

  static bool DeriveBits(

      Environment* env,

      const ScryptConfig& params,

      ByteSource* out);

  static v8::Maybe<bool> EncodeOutput(

      Environment* env,

      const ScryptConfig& params,

      ByteSource* out,

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

};

using ScryptJob = DeriveBitsJob<ScryptTraits>;

#else

// If there is no Scrypt support, ScryptJob becomes a non-op

struct ScryptJob {

  static void Initialize(

      Environment* env,

      v8::Local<v8::Object> target) {}

};

#endif  // !OPENSSL_NO_SCRYPT

}  // namespace crypto

}  // namespace node

#endif  // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS

#endif  // SRC_CRYPTO_CRYPTO_SCRYPT_H_