public:

static void Initialize(Environment* env, v8::Local<v8::Object> target);

static void RegisterExternalReferences(ExternalReferenceRegistry* registry);

void MemoryInfo(MemoryTracker* tracker) const override;

SET_MEMORY_INFO_NAME(Hmac)

SET_SELF_SIZE(Hmac)

protected:

void HmacInit(const char* hash_type, const char* key, int key_len);

bool HmacUpdate(const char* data, size_t len);

static void New(const v8::FunctionCallbackInfo<v8::Value>& args);

static void HmacInit(const v8::FunctionCallbackInfo<v8::Value>& args);

static void HmacUpdate(const v8::FunctionCallbackInfo<v8::Value>& args);

static void HmacDigest(const v8::FunctionCallbackInfo<v8::Value>& args);

Hmac(Environment* env, v8::Local<v8::Object> wrap);

static void Sign(const v8::FunctionCallbackInfo<v8::Value>& args);

private:

HMACCtxPointer ctx_;

CryptoJobMode job_mode;

SignConfiguration::Mode mode;

KeyObjectData key;

ByteSource data;

ByteSource signature;

const EVP_MD* digest;

HmacConfig() = default;

explicit HmacConfig(HmacConfig&& other) noexcept;

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

void MemoryInfo(MemoryTracker* tracker) const override;

SET_MEMORY_INFO_NAME(HmacConfig)

SET_SELF_SIZE(HmacConfig)

};

struct HmacTraits final {

using AdditionalParameters = HmacConfig;

static constexpr const char* JobName = "HmacJob";

// TODO(@jasnell): Sign request vs. Verify request

static constexpr AsyncWrap::ProviderType Provider =

AsyncWrap::PROVIDER_SIGNREQUEST;

static v8::Maybe<void> AdditionalConfig(

CryptoJobMode mode,

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

unsigned int offset,

HmacConfig* params);

static bool DeriveBits(

Environment* env,

const HmacConfig& params,

ByteSource* out);

static v8::MaybeLocal<v8::Value> EncodeOutput(Environment* env,

const HmacConfig& params,

ByteSource* out);

};

using HmacJob = DeriveBitsJob<HmacTraits>;