public:

enum class Error {

Ok,

UnknownDigest,

Init,

NotInitialised,

Update,

PrivateKey,

PublicKey,

MalformedSignature

};

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

Error Init(const char* digest);

Error Update(const char* data, size_t len);

// TODO(joyeecheung): track the memory used by OpenSSL types

void MemoryInfo(MemoryTracker* tracker) const override;

SET_MEMORY_INFO_NAME(SignBase)

SET_SELF_SIZE(SignBase)

protected:

ncrypto::EVPMDCtxPointer mdctx_;

public:

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

static void RegisterExternalReferences(ExternalReferenceRegistry* registry);

struct SignResult {

Error error;

std::unique_ptr<v8::BackingStore> signature;

inline explicit SignResult(

Error err, std::unique_ptr<v8::BackingStore>&& sig = nullptr)

: error(err), signature(std::move(sig)) {}

};

SignResult SignFinal(const ncrypto::EVPKeyPointer& pkey,

int padding,

std::optional<int> saltlen,

DSASigEnc dsa_sig_enc);

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

protected:

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

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

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

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

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

public:

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

static void RegisterExternalReferences(ExternalReferenceRegistry* registry);

Error VerifyFinal(const ncrypto::EVPKeyPointer& key,

const ByteSource& sig,

int padding,

std::optional<int> saltlen,

bool* verify_result);

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

protected:

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

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

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

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

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

enum class Mode { Sign, Verify };

enum Flags {

kHasNone = 0,

kHasSaltLength = 1,

kHasPadding = 2

};

CryptoJobMode job_mode;

Mode mode;

KeyObjectData key;

ByteSource data;

ByteSource signature;

ncrypto::Digest digest;

int flags = SignConfiguration::kHasNone;

int padding = 0;

int salt_length = 0;

DSASigEnc dsa_encoding = DSASigEnc::DER;

SignConfiguration() = default;

explicit SignConfiguration(SignConfiguration&& other) noexcept;

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

void MemoryInfo(MemoryTracker* tracker) const override;

SET_MEMORY_INFO_NAME(SignConfiguration)

SET_SELF_SIZE(SignConfiguration)

};

struct SignTraits final {

using AdditionalParameters = SignConfiguration;

static constexpr const char* JobName = "SignJob";

static constexpr AsyncWrap::ProviderType Provider =

AsyncWrap::PROVIDER_SIGNREQUEST;

static v8::Maybe<void> AdditionalConfig(

CryptoJobMode mode,

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

unsigned int offset,

SignConfiguration* params);

static bool DeriveBits(

Environment* env,

const SignConfiguration& params,

ByteSource* out);

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

const SignConfiguration& params,

ByteSource* out);

};

using SignJob = DeriveBitsJob<SignTraits>;