whisperv5

package
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 Go to latest Published: Oct 26, 2018 License: GPL-3.0 Imports: 30 Imported by: 32

Documentation

Overview

Package whisper implements the Whisper protocol (version 5).

Whisper combines aspects of both DHTs and datagram messaging systems (e.g. UDP). As such it may be likened and compared to both, not dissimilar to the matter/energy duality (apologies to physicists for the blatant abuse of a fundamental and beautiful natural principle).

Whisper is a pure identity-based messaging system. Whisper provides a low-level (non-application-specific) but easily-accessible API without being based upon or prejudiced by the low-level hardware attributes and characteristics, particularly the notion of singular endpoints.

Index

Constants

View Source 
const (
	EnvelopeVersion    = uint64(0)
	ProtocolVersion    = uint64(5)
	ProtocolVersionStr = "5.0"
	ProtocolName       = "shh"

	NumberOfMessageCodes = 64

	TopicLength = 4

	AESNonceLength = 12

	MaxMessageSize        = uint32(10 * 1024 * 1024) // maximum accepted size of a message.
	DefaultMaxMessageSize = uint32(1024 * 1024)
	DefaultMinimumPoW     = 0.2

	DefaultTTL     = 50 // seconds
	SynchAllowance = 10 // seconds
)

Variables

View Source 
var (
	ErrSymAsym              = errors.New("specify either a symmetric or an asymmetric key")
	ErrInvalidSymmetricKey  = errors.New("invalid symmetric key")
	ErrInvalidPublicKey     = errors.New("invalid public key")
	ErrInvalidSigningPubKey = errors.New("invalid signing public key")
	ErrTooLowPoW            = errors.New("message rejected, PoW too low")
	ErrNoTopics             = errors.New("missing topic(s)")
)
View Source 
var DefaultConfig = Config{
	MaxMessageSize:     DefaultMaxMessageSize,
	MinimumAcceptedPOW: DefaultMinimumPoW,
}

Functions

func BytesToUintBigEndian 

func BytesToUintBigEndian(b []byte) (res uint64)

BytesToUintBigEndian converts the slice to 64-bit unsigned integer.

func GenerateRandomID 

func GenerateRandomID() (id string, err error)

GenerateRandomID generates a random string, which is then returned to be used as a key id

func IsPubKeyEqual 

func IsPubKeyEqual(a, b *ecdsa.PublicKey) bool

func NewSentMessage 

func NewSentMessage(params *MessageParams) (*sentMessage, error)

NewMessage creates and initializes a non-signed, non-encrypted Whisper message.

func ValidatePublicKey 

func ValidatePublicKey(k *ecdsa.PublicKey) bool

ValidatePublicKey checks the format of the given public key.

Types

type Config 

type Config struct {
	MaxMessageSize     uint32  `toml:",omitempty"`
	MinimumAcceptedPOW float64 `toml:",omitempty"`
}

type Criteria 

type Criteria struct {
	SymKeyID     string      `json:"symKeyID"`
	PrivateKeyID string      `json:"privateKeyID"`
	Sig          []byte      `json:"sig"`
	MinPow       float64     `json:"minPow"`
	Topics       []TopicType `json:"topics"`
	AllowP2P     bool        `json:"allowP2P"`
}

Criteria holds various filter options for inbound messages.

func (Criteria) MarshalJSON 

func (c Criteria) MarshalJSON() ([]byte, error)

func (*Criteria) UnmarshalJSON 

func (c *Criteria) UnmarshalJSON(input []byte) error

type Envelope 

type Envelope struct {
	Version  []byte
	Expiry   uint32
	TTL      uint32
	Topic    TopicType
	AESNonce []byte
	Data     []byte
	EnvNonce uint64
	// contains filtered or unexported fields
}

Envelope represents a clear-text data packet to transmit through the Whisper network. Its contents may or may not be encrypted and signed.

func NewEnvelope 

func NewEnvelope(ttl uint32, topic TopicType, aesNonce []byte, msg *sentMessage) *Envelope

NewEnvelope wraps a Whisper message with expiration and destination data included into an envelope for network forwarding.

func (*Envelope) DecodeRLP 

func (e *Envelope) DecodeRLP(s *rlp.Stream) error

DecodeRLP decodes an Envelope from an RLP data stream.

func (*Envelope) Hash 

func (e *Envelope) Hash() common.Hash

Hash returns the SHA3 hash of the envelope, calculating it if not yet done.

func (*Envelope) IsSymmetric 

func (e *Envelope) IsSymmetric() bool

func (*Envelope) Open 

func (e *Envelope) Open(watcher *Filter) (msg *ReceivedMessage)

Open tries to decrypt an envelope, and populates the message fields in case of success.

func (*Envelope) OpenAsymmetric 

func (e *Envelope) OpenAsymmetric(key *ecdsa.PrivateKey) (*ReceivedMessage, error)

OpenAsymmetric tries to decrypt an envelope, potentially encrypted with a particular key.

func (*Envelope) OpenSymmetric 

func (e *Envelope) OpenSymmetric(key []byte) (msg *ReceivedMessage, err error)

OpenSymmetric tries to decrypt an envelope, potentially encrypted with a particular key.

func (*Envelope) PoW 

func (e *Envelope) PoW() float64

func (*Envelope) Seal 

func (e *Envelope) Seal(options *MessageParams) error

Seal closes the envelope by spending the requested amount of time as a proof of work on hashing the data.

func (*Envelope) Ver 

func (e *Envelope) Ver() uint64

type Filter 

type Filter struct {
	Src        *ecdsa.PublicKey  // Sender of the message
	KeyAsym    *ecdsa.PrivateKey // Private Key of recipient
	KeySym     []byte            // Key associated with the Topic
	Topics     [][]byte          // Topics to filter messages with
	PoW        float64           // Proof of work as described in the Whisper spec
	AllowP2P   bool              // Indicates whether this filter is interested in direct peer-to-peer messages
	SymKeyHash common.Hash       // The Keccak256Hash of the symmetric key, needed for optimization

	Messages map[common.Hash]*ReceivedMessage
	// contains filtered or unexported fields
}

func (*Filter) MatchEnvelope 

func (f *Filter) MatchEnvelope(envelope *Envelope) bool

func (*Filter) MatchMessage 

func (f *Filter) MatchMessage(msg *ReceivedMessage) bool

func (*Filter) MatchTopic 

func (f *Filter) MatchTopic(topic TopicType) bool

func (*Filter) Retrieve 

func (f *Filter) Retrieve() (all []*ReceivedMessage)

func (*Filter) Trigger 

func (f *Filter) Trigger(msg *ReceivedMessage)

type Filters 

type Filters struct {
	// contains filtered or unexported fields
}

func NewFilters 

func NewFilters(w *Whisper) *Filters

func (*Filters) Get 

func (fs *Filters) Get(id string) *Filter

func (*Filters) Install 

func (fs *Filters) Install(watcher *Filter) (string, error)

func (*Filters) NotifyWatchers 

func (fs *Filters) NotifyWatchers(env *Envelope, p2pMessage bool)

func (*Filters) Uninstall 

func (fs *Filters) Uninstall(id string) bool

type Info 

type Info struct {
	Memory         int     `json:"memory"`         // Memory size of the floating messages in bytes.
	Messages       int     `json:"messages"`       // Number of floating messages.
	MinPow         float64 `json:"minPow"`         // Minimal accepted PoW
	MaxMessageSize uint32  `json:"maxMessageSize"` // Maximum accepted message size
}

Info contains diagnostic information.

type MailServer 

type MailServer interface {
	Archive(env *Envelope)
	DeliverMail(whisperPeer *Peer, request *Envelope)
}

MailServer represents a mail server, capable of archiving the old messages for subsequent delivery to the peers. Any implementation must ensure that both functions are thread-safe. Also, they must return ASAP. DeliverMail should use directMessagesCode for delivery, in order to bypass the expiry checks.

type Message 

type Message struct {
	Sig       []byte    `json:"sig,omitempty"`
	TTL       uint32    `json:"ttl"`
	Timestamp uint32    `json:"timestamp"`
	Topic     TopicType `json:"topic"`
	Payload   []byte    `json:"payload"`
	Padding   []byte    `json:"padding"`
	PoW       float64   `json:"pow"`
	Hash      []byte    `json:"hash"`
	Dst       []byte    `json:"recipientPublicKey,omitempty"`
}

Message is the RPC representation of a whisper message.

func ToWhisperMessage 

func ToWhisperMessage(message *ReceivedMessage) *Message

ToWhisperMessage converts an internal message into an API version.

func (Message) MarshalJSON 

func (m Message) MarshalJSON() ([]byte, error)

func (*Message) UnmarshalJSON 

func (m *Message) UnmarshalJSON(input []byte) error

type MessageParams 

type MessageParams struct {
	TTL      uint32
	Src      *ecdsa.PrivateKey
	Dst      *ecdsa.PublicKey
	KeySym   []byte
	Topic    TopicType
	WorkTime uint32
	PoW      float64
	Payload  []byte
	Padding  []byte
}

Options specifies the exact way a message should be wrapped into an Envelope.

type NewMessage 

type NewMessage struct {
	SymKeyID   string    `json:"symKeyID"`
	PublicKey  []byte    `json:"pubKey"`
	Sig        string    `json:"sig"`
	TTL        uint32    `json:"ttl"`
	Topic      TopicType `json:"topic"`
	Payload    []byte    `json:"payload"`
	Padding    []byte    `json:"padding"`
	PowTime    uint32    `json:"powTime"`
	PowTarget  float64   `json:"powTarget"`
	TargetPeer string    `json:"targetPeer"`
}

NewMessage represents a new whisper message that is posted through the RPC.

func (NewMessage) MarshalJSON 

func (n NewMessage) MarshalJSON() ([]byte, error)

func (*NewMessage) UnmarshalJSON 

func (n *NewMessage) UnmarshalJSON(input []byte) error

type Peer 

type Peer struct {
	// contains filtered or unexported fields
}

peer represents a whisper protocol peer connection.

func (*Peer) ID 

func (p *Peer) ID() []byte

type PublicWhisperAPI 

type PublicWhisperAPI struct {
	// contains filtered or unexported fields
}

PublicWhisperAPI provides the whisper RPC service that can be use publicly without security implications.

func NewPublicWhisperAPI 

func NewPublicWhisperAPI(w *Whisper) *PublicWhisperAPI

NewPublicWhisperAPI create a new RPC whisper service.

func (*PublicWhisperAPI) AddPrivateKey 

func (api *PublicWhisperAPI) AddPrivateKey(ctx context.Context, privateKey hexutil.Bytes) (string, error)

AddPrivateKey imports the given private key.

func (*PublicWhisperAPI) AddSymKey 

func (api *PublicWhisperAPI) AddSymKey(ctx context.Context, key hexutil.Bytes) (string, error)

AddSymKey import a symmetric key. It returns an ID that can be used to refer to the key. Can be used encrypting and decrypting messages where the key is known to both parties.

func (*PublicWhisperAPI) DeleteKeyPair 

func (api *PublicWhisperAPI) DeleteKeyPair(ctx context.Context, key string) (bool, error)

DeleteKeyPair removes the key with the given key if it exists.

func (*PublicWhisperAPI) DeleteMessageFilter 

func (api *PublicWhisperAPI) DeleteMessageFilter(id string) (bool, error)

DeleteMessageFilter deletes a filter.

func (*PublicWhisperAPI) DeleteSymKey 

func (api *PublicWhisperAPI) DeleteSymKey(ctx context.Context, id string) bool

DeleteSymKey deletes the symmetric key that is associated with the given id.

func (*PublicWhisperAPI) GenerateSymKeyFromPassword 

func (api *PublicWhisperAPI) GenerateSymKeyFromPassword(ctx context.Context, passwd string) (string, error)

GenerateSymKeyFromPassword derive a key from the given password, stores it, and returns its ID.

func (*PublicWhisperAPI) GetFilterMessages 

func (api *PublicWhisperAPI) GetFilterMessages(id string) ([]*Message, error)

GetFilterMessages returns the messages that match the filter criteria and are received between the last poll and now.

func (*PublicWhisperAPI) GetPrivateKey 

func (api *PublicWhisperAPI) GetPrivateKey(ctx context.Context, id string) (hexutil.Bytes, error)

GetPublicKey returns the private key associated with the given key. The key is the hex encoded representation of a key in the form specified in section 4.3.6 of ANSI X9.62.

func (*PublicWhisperAPI) GetPublicKey 

func (api *PublicWhisperAPI) GetPublicKey(ctx context.Context, id string) (hexutil.Bytes, error)

GetPublicKey returns the public key associated with the given key. The key is the hex encoded representation of a key in the form specified in section 4.3.6 of ANSI X9.62.

func (*PublicWhisperAPI) GetSymKey 

func (api *PublicWhisperAPI) GetSymKey(ctx context.Context, id string) (hexutil.Bytes, error)

GetSymKey returns the symmetric key associated with the given id.

func (*PublicWhisperAPI) HasKeyPair 

func (api *PublicWhisperAPI) HasKeyPair(ctx context.Context, id string) bool

HasKeyPair returns an indication if the node has a key pair that is associated with the given id.

func (*PublicWhisperAPI) HasSymKey 

func (api *PublicWhisperAPI) HasSymKey(ctx context.Context, id string) bool

HasSymKey returns an indication if the node has a symmetric key associated with the given key.

func (*PublicWhisperAPI) Info 

func (api *PublicWhisperAPI) Info(ctx context.Context) Info

Info returns diagnostic information about the whisper node.

func (*PublicWhisperAPI) MarkTrustedPeer 

func (api *PublicWhisperAPI) MarkTrustedPeer(ctx context.Context, enode string) (bool, error)

MarkTrustedPeer marks a peer trusted. , which will allow it to send historic (expired) messages. Note: This function is not adding new nodes, the node needs to exists as a peer.

func (*PublicWhisperAPI) Messages 

func (api *PublicWhisperAPI) Messages(ctx context.Context, crit Criteria) (*rpc.Subscription, error)

Messages set up a subscription that fires events when messages arrive that match the given set of criteria.

func (*PublicWhisperAPI) NewKeyPair 

func (api *PublicWhisperAPI) NewKeyPair(ctx context.Context) (string, error)

NewKeyPair generates a new public and private key pair for message decryption and encryption. It returns an ID that can be used to refer to the keypair.

func (*PublicWhisperAPI) NewMessageFilter 

func (api *PublicWhisperAPI) NewMessageFilter(req Criteria) (string, error)

NewMessageFilter creates a new filter that can be used to poll for (new) messages that satisfy the given criteria.

func (*PublicWhisperAPI) NewSymKey 

func (api *PublicWhisperAPI) NewSymKey(ctx context.Context) (string, error)

NewSymKey generate a random symmetric key. It returns an ID that can be used to refer to the key. Can be used encrypting and decrypting messages where the key is known to both parties.

func (*PublicWhisperAPI) Post 

func (api *PublicWhisperAPI) Post(ctx context.Context, req NewMessage) (bool, error)

Post a message on the Whisper network.

func (*PublicWhisperAPI) SetMaxMessageSize 

func (api *PublicWhisperAPI) SetMaxMessageSize(ctx context.Context, size uint32) (bool, error)

SetMaxMessageSize sets the maximum message size that is accepted. Upper limit is defined in whisperv5.MaxMessageSize.

func (*PublicWhisperAPI) SetMinPoW 

func (api *PublicWhisperAPI) SetMinPoW(ctx context.Context, pow float64) (bool, error)

SetMinPow sets the minimum PoW for a message before it is accepted.

func (*PublicWhisperAPI) Version 

func (api *PublicWhisperAPI) Version(ctx context.Context) string

Version returns the Whisper sub-protocol version.

type ReceivedMessage 

type ReceivedMessage struct {
	Raw []byte

	Payload   []byte
	Padding   []byte
	Signature []byte

	PoW   float64          // Proof of work as described in the Whisper spec
	Sent  uint32           // Time when the message was posted into the network
	TTL   uint32           // Maximum time to live allowed for the message
	Src   *ecdsa.PublicKey // Message recipient (identity used to decode the message)
	Dst   *ecdsa.PublicKey // Message recipient (identity used to decode the message)
	Topic TopicType

	SymKeyHash      common.Hash // The Keccak256Hash of the key, associated with the Topic
	EnvelopeHash    common.Hash // Message envelope hash to act as a unique id
	EnvelopeVersion uint64
}

ReceivedMessage represents a data packet to be received through the Whisper protocol.

func (*ReceivedMessage) SigToPubKey 

func (msg *ReceivedMessage) SigToPubKey() *ecdsa.PublicKey

Recover retrieves the public key of the message signer.

func (*ReceivedMessage) Validate 

func (msg *ReceivedMessage) Validate() bool

Validate checks the validity and extracts the fields in case of success

type Statistics 

type Statistics struct {
	// contains filtered or unexported fields
}

type TopicType 

type TopicType [TopicLength]byte

Topic represents a cryptographically secure, probabilistic partial classifications of a message, determined as the first (left) 4 bytes of the SHA3 hash of some arbitrary data given by the original author of the message.

func BytesToTopic 

func BytesToTopic(b []byte) (t TopicType)

func (TopicType) MarshalText 

func (t TopicType) MarshalText() ([]byte, error)

MarshalText returns the hex representation of t.

func (*TopicType) String 

func (t *TopicType) String() string

String converts a topic byte array to a string representation.

func (*TopicType) UnmarshalText 

func (t *TopicType) UnmarshalText(input []byte) error

UnmarshalText parses a hex representation to a topic.

type Whisper 

type Whisper struct {
	// contains filtered or unexported fields
}

Whisper represents a dark communication interface through the Ethereum network, using its very own P2P communication layer.

func New 

func New(cfg *Config) *Whisper

New creates a Whisper client ready to communicate through the Ethereum P2P network.

func (*Whisper) APIs 

func (w *Whisper) APIs() []rpc.API

APIs returns the RPC descriptors the Whisper implementation offers

func (*Whisper) AddKeyPair 

func (w *Whisper) AddKeyPair(key *ecdsa.PrivateKey) (string, error)

AddKeyPair imports a asymmetric private key and returns it identifier.

func (*Whisper) AddSymKeyDirect 

func (w *Whisper) AddSymKeyDirect(key []byte) (string, error)

AddSymKeyDirect stores the key, and returns its id.

func (*Whisper) AddSymKeyFromPassword 

func (w *Whisper) AddSymKeyFromPassword(password string) (string, error)

AddSymKeyFromPassword generates the key from password, stores it, and returns its id.

func (*Whisper) AllowP2PMessagesFromPeer 

func (w *Whisper) AllowP2PMessagesFromPeer(peerID []byte) error

AllowP2PMessagesFromPeer marks specific peer trusted, which will allow it to send historic (expired) messages.

func (*Whisper) DeleteKeyPair 

func (w *Whisper) DeleteKeyPair(key string) bool

DeleteKeyPair deletes the specified key if it exists.

func (*Whisper) DeleteSymKey 

func (w *Whisper) DeleteSymKey(id string) bool

DeleteSymKey deletes the key associated with the name string if it exists.

func (*Whisper) Envelopes 

func (w *Whisper) Envelopes() []*Envelope

Envelopes retrieves all the messages currently pooled by the node.

func (*Whisper) GenerateSymKey 

func (w *Whisper) GenerateSymKey() (string, error)

GenerateSymKey generates a random symmetric key and stores it under id, which is then returned. Will be used in the future for session key exchange.

func (*Whisper) GetFilter 

func (w *Whisper) GetFilter(id string) *Filter

GetFilter returns the filter by id.

func (*Whisper) GetPrivateKey 

func (w *Whisper) GetPrivateKey(id string) (*ecdsa.PrivateKey, error)

GetPrivateKey retrieves the private key of the specified identity.

func (*Whisper) GetSymKey 

func (w *Whisper) GetSymKey(id string) ([]byte, error)

GetSymKey returns the symmetric key associated with the given id.

func (*Whisper) HandlePeer 

func (wh *Whisper) HandlePeer(peer *p2p.Peer, rw p2p.MsgReadWriter) error

HandlePeer is called by the underlying P2P layer when the whisper sub-protocol connection is negotiated.

func (*Whisper) HasKeyPair 

func (w *Whisper) HasKeyPair(id string) bool

HasKeyPair checks if the the whisper node is configured with the private key of the specified public pair.

func (*Whisper) HasSymKey 

func (w *Whisper) HasSymKey(id string) bool

HasSymKey returns true if there is a key associated with the given id. Otherwise returns false.

func (*Whisper) MaxMessageSize 

func (w *Whisper) MaxMessageSize() uint32

MaxMessageSize returns the maximum accepted message size.

func (*Whisper) Messages 

func (w *Whisper) Messages(id string) []*ReceivedMessage

Messages iterates through all currently floating envelopes and retrieves all the messages, that this filter could decrypt.

func (*Whisper) MinPow 

func (w *Whisper) MinPow() float64

func (*Whisper) NewKeyPair 

func (w *Whisper) NewKeyPair() (string, error)

NewKeyPair generates a new cryptographic identity for the client, and injects it into the known identities for message decryption. Returns ID of the new key pair.

func (*Whisper) Overflow 

func (w *Whisper) Overflow() bool

Overflow returns an indication if the message queue is full.

func (*Whisper) Protocols 

func (w *Whisper) Protocols() []p2p.Protocol

Protocols returns the whisper sub-protocols ran by this particular client.

func (*Whisper) RegisterServer 

func (w *Whisper) RegisterServer(server MailServer)

RegisterServer registers MailServer interface. MailServer will process all the incoming messages with p2pRequestCode.

func (*Whisper) RequestHistoricMessages 

func (w *Whisper) RequestHistoricMessages(peerID []byte, envelope *Envelope) error

RequestHistoricMessages sends a message with p2pRequestCode to a specific peer, which is known to implement MailServer interface, and is supposed to process this request and respond with a number of peer-to-peer messages (possibly expired), which are not supposed to be forwarded any further. The whisper protocol is agnostic of the format and contents of envelope.

func (*Whisper) Send 

func (w *Whisper) Send(envelope *Envelope) error

Send injects a message into the whisper send queue, to be distributed in the network in the coming cycles.

func (*Whisper) SendP2PDirect 

func (w *Whisper) SendP2PDirect(peer *Peer, envelope *Envelope) error

SendP2PDirect sends a peer-to-peer message to a specific peer.

func (*Whisper) SendP2PMessage 

func (w *Whisper) SendP2PMessage(peerID []byte, envelope *Envelope) error

SendP2PMessage sends a peer-to-peer message to a specific peer.

func (*Whisper) SetMaxMessageSize 

func (w *Whisper) SetMaxMessageSize(size uint32) error

SetMaxMessageSize sets the maximal message size allowed by this node

func (*Whisper) SetMinimumPoW 

func (w *Whisper) SetMinimumPoW(val float64) error

SetMinimumPoW sets the minimal PoW required by this node

func (*Whisper) Start 

func (w *Whisper) Start(p2p *p2p.Server) error

Start implements node.Service, starting the background data propagation thread of the Whisper protocol.

func (*Whisper) Stats 

func (w *Whisper) Stats() Statistics

Stats returns the whisper node statistics.

func (*Whisper) Stop 

func (w *Whisper) Stop() error

Stop implements node.Service, stopping the background data propagation thread of the Whisper protocol.

func (*Whisper) Subscribe 

func (w *Whisper) Subscribe(f *Filter) (string, error)

Subscribe installs a new message handler used for filtering, decrypting and subsequent storing of incoming messages.

func (*Whisper) Unsubscribe 

func (w *Whisper) Unsubscribe(id string) error

Unsubscribe removes an installed message handler.

func (*Whisper) Version 

func (w *Whisper) Version() uint

Version returns the whisper sub-protocols version number.

Source Files

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