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Merge pull request #690 from karalabe/whisper-cleanup

Browse Source 
Whisper cleanup, part 1
This commit is contained in:
Felix Lange 2015-04-13 13:39:59 +02:00
commit faa2747809
9 changed files with 384 additions and 200 deletions
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4
ui/qt/qwhisper/whisper.go
View File

@ -37,8 +37,8 @@ func (self *Whisper) Post(payload []string, to, from string, topics []string, pr
pk := crypto.ToECDSAPub(common.FromHex(from))
if key := self.Whisper.GetIdentity(pk); key != nil {
msg := whisper.NewMessage(data)
envelope, err := msg.Seal(time.Duration(priority*100000), whisper.Opts{
Ttl: time.Duration(ttl) * time.Second,
envelope, err := msg.Wrap(time.Duration(priority*100000), whisper.Options{
TTL: time.Duration(ttl) * time.Second,
To: crypto.ToECDSAPub(common.FromHex(to)),
From: key,
Topics: whisper.TopicsFromString(topics...),

173
whisper/envelope.go
View File

@ -1,3 +1,6 @@
// Contains the Whisper protocol Envelope element. For formal details please see
// the specs at https://github.com/ethereum/wiki/wiki/Whisper-PoC-1-Protocol-Spec#envelopes.
package whisper
import (
@ -12,10 +15,8 @@ import (
"github.com/ethereum/go-ethereum/rlp"
)
const (
DefaultPow = 50 * time.Millisecond
)
// Envelope represents a clear-text data packet to transmit through the Whisper
// network. Its contents may or may not be encrypted and signed.
type Envelope struct {
Expiry uint32 // Whisper protocol specifies int32, really should be int64
TTL uint32 // ^^^^^^
@ -26,6 +27,91 @@ type Envelope struct {
hash common.Hash
}
// NewEnvelope wraps a Whisper message with expiration and destination data
// included into an envelope for network forwarding.
func NewEnvelope(ttl time.Duration, topics [][]byte, msg *Message) *Envelope {
return &Envelope{
Expiry: uint32(time.Now().Add(ttl).Unix()),
TTL: uint32(ttl.Seconds()),
Topics: topics,
Data: msg.bytes(),
Nonce: 0,
}
}
// Seal closes the envelope by spending the requested amount of time as a proof
// of work on hashing the data.
func (self *Envelope) Seal(pow time.Duration) {
d := make([]byte, 64)
copy(d[:32], self.rlpWithoutNonce())
finish, bestBit := time.Now().Add(pow).UnixNano(), 0
for nonce := uint32(0); time.Now().UnixNano() < finish; {
for i := 0; i < 1024; i++ {
binary.BigEndian.PutUint32(d[60:], nonce)
firstBit := common.FirstBitSet(common.BigD(crypto.Sha3(d)))
if firstBit > bestBit {
self.Nonce, bestBit = nonce, firstBit
}
nonce++
}
}
}
// valid checks whether the claimed proof of work was indeed executed.
// TODO: Is this really useful? Isn't this always true?
func (self *Envelope) valid() bool {
d := make([]byte, 64)
copy(d[:32], self.rlpWithoutNonce())
binary.BigEndian.PutUint32(d[60:], self.Nonce)
return common.FirstBitSet(common.BigD(crypto.Sha3(d))) > 0
}
// rlpWithoutNonce returns the RLP encoded envelope contents, except the nonce.
func (self *Envelope) rlpWithoutNonce() []byte {
enc, _ := rlp.EncodeToBytes([]interface{}{self.Expiry, self.TTL, self.Topics, self.Data})
return enc
}
// Open extracts the message contained within a potentially encrypted envelope.
func (self *Envelope) Open(key *ecdsa.PrivateKey) (msg *Message, err error) {
// Split open the payload into a message construct
data := self.Data
message := &Message{
Flags: data[0],
}
data = data[1:]
if message.Flags&128 == 128 {
if len(data) < 65 {
return nil, fmt.Errorf("unable to open envelope. First bit set but len(data) < 65")
}
message.Signature, data = data[:65], data[65:]
}
message.Payload = data
// Short circuit if the encryption was requested
if key == nil {
return message, nil
}
// Otherwise try to decrypt the message
message.Payload, err = crypto.Decrypt(key, message.Payload)
switch err {
case nil:
return message, nil
case ecies.ErrInvalidPublicKey: // Payload isn't encrypted
return message, err
default:
return nil, fmt.Errorf("unable to open envelope, decrypt failed: %v", err)
}
}
// Hash returns the SHA3 hash of the envelope, calculating it if not yet done.
func (self *Envelope) Hash() common.Hash {
if (self.hash == common.Hash{}) {
enc, _ := rlp.EncodeToBytes(self)
@ -34,88 +120,11 @@ func (self *Envelope) Hash() common.Hash {
return self.hash
}
func NewEnvelope(ttl time.Duration, topics [][]byte, data *Message) *Envelope {
exp := time.Now().Add(ttl)
return &Envelope{
Expiry: uint32(exp.Unix()),
TTL: uint32(ttl.Seconds()),
Topics: topics,
Data: data.Bytes(),
Nonce: 0,
}
}
func (self *Envelope) Seal(pow time.Duration) {
self.proveWork(pow)
}
func (self *Envelope) Open(prv *ecdsa.PrivateKey) (msg *Message, err error) {
data := self.Data
var message Message
dataStart := 1
if data[0] > 0 {
if len(data) < 66 {
return nil, fmt.Errorf("unable to open envelope. First bit set but len(data) < 66")
}
dataStart = 66
message.Flags = data[0]
message.Signature = data[1:66]
}
payload := data[dataStart:]
if prv != nil {
message.Payload, err = crypto.Decrypt(prv, payload)
switch err {
case nil: // OK
case ecies.ErrInvalidPublicKey: // Payload isn't encrypted
message.Payload = payload
return &message, err
default:
return nil, fmt.Errorf("unable to open envelope. Decrypt failed: %v", err)
}
}
return &message, nil
}
func (self *Envelope) proveWork(dura time.Duration) {
var bestBit int
d := make([]byte, 64)
enc, _ := rlp.EncodeToBytes(self.withoutNonce())
copy(d[:32], enc)
then := time.Now().Add(dura).UnixNano()
for n := uint32(0); time.Now().UnixNano() < then; {
for i := 0; i < 1024; i++ {
binary.BigEndian.PutUint32(d[60:], n)
fbs := common.FirstBitSet(common.BigD(crypto.Sha3(d)))
if fbs > bestBit {
bestBit = fbs
self.Nonce = n
}
n++
}
}
}
func (self *Envelope) valid() bool {
d := make([]byte, 64)
enc, _ := rlp.EncodeToBytes(self.withoutNonce())
copy(d[:32], enc)
binary.BigEndian.PutUint32(d[60:], self.Nonce)
return common.FirstBitSet(common.BigD(crypto.Sha3(d))) > 0
}
func (self *Envelope) withoutNonce() interface{} {
return []interface{}{self.Expiry, self.TTL, self.Topics, self.Data}
}
// rlpenv is an Envelope but is not an rlp.Decoder.
// It is used for decoding because we need to
type rlpenv Envelope
// DecodeRLP decodes an Envelope from an RLP data stream.
func (self *Envelope) DecodeRLP(s *rlp.Stream) error {
raw, err := s.Raw()
if err != nil {

83
whisper/main.go
View File

@ -1,37 +1,90 @@
// +build none
// Contains a simple whisper peer setup and self messaging to allow playing
// around with the protocol and API without a fancy client implementation.
package main
import (
"fmt"
"log"
"os"
"time"
"github.com/ethereum/go-ethereum/crypto/secp256k1"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/nat"
"github.com/ethereum/go-ethereum/whisper"
)
func main() {
logger.AddLogSystem(logger.NewStdLogSystem(os.Stdout, log.LstdFlags, logger.InfoLevel))
pub, _ := secp256k1.GenerateKeyPair()
whisper := whisper.New()
srv := p2p.Server{
MaxPeers: 10,
Identity: p2p.NewSimpleClientIdentity("whisper-go", "1.0", "", string(pub)),
ListenAddr: ":30300",
NAT: p2p.UPNP(),
Protocols: []p2p.Protocol{whisper.Protocol()},
// Generate the peer identity
key, err := crypto.GenerateKey()
if err != nil {
fmt.Printf("Failed to generate peer key: %v.\n", err)
os.Exit(-1)
}
if err := srv.Start(); err != nil {
fmt.Println("could not start server:", err)
name := common.MakeName("whisper-go", "1.0")
shh := whisper.New()
// Create an Ethereum peer to communicate through
server := p2p.Server{
PrivateKey: key,
MaxPeers: 10,
Name: name,
Protocols: []p2p.Protocol{shh.Protocol()},
ListenAddr: ":30300",
NAT: nat.Any(),
}
fmt.Println("Starting Ethereum peer...")
if err := server.Start(); err != nil {
fmt.Printf("Failed to start Ethereum peer: %v.\n", err)
os.Exit(1)
}
select {}
// Send a message to self to check that something works
payload := fmt.Sprintf("Hello world, this is %v. In case you're wondering, the time is %v", name, time.Now())
if err := selfSend(shh, []byte(payload)); err != nil {
fmt.Printf("Failed to self message: %v.\n", err)
os.Exit(-1)
}
}
// SendSelf wraps a payload into a Whisper envelope and forwards it to itself.
func selfSend(shh *whisper.Whisper, payload []byte) error {
ok := make(chan struct{})
// Start watching for self messages, output any arrivals
id := shh.NewIdentity()
shh.Watch(whisper.Filter{
To: &id.PublicKey,
Fn: func(msg *whisper.Message) {
fmt.Printf("Message received: %s, signed with 0x%x.\n", string(msg.Payload), msg.Signature)
close(ok)
},
})
// Wrap the payload and encrypt it
msg := whisper.NewMessage(payload)
envelope, err := msg.Wrap(whisper.DefaultProofOfWork, whisper.Options{
From: id,
To: &id.PublicKey,
TTL: whisper.DefaultTimeToLive,
})
if err != nil {
return fmt.Errorf("failed to seal message: %v", err)
}
// Dump the message into the system and wait for it to pop back out
if err := shh.Send(envelope); err != nil {
return fmt.Errorf("failed to send self-message: %v", err)
}
select {
case <-ok:
case <-time.After(time.Second):
return fmt.Errorf("failed to receive message in time")
}
return nil
}

123
whisper/message.go
View File

@ -1,7 +1,11 @@
// Contains the Whisper protocol Message element. For formal details please see
// the specs at https://github.com/ethereum/wiki/wiki/Whisper-PoC-1-Protocol-Spec#messages.
package whisper
import (
"crypto/ecdsa"
"math/rand"
"time"
"github.com/ethereum/go-ethereum/crypto"
@ -9,8 +13,11 @@ import (
"github.com/ethereum/go-ethereum/logger/glog"
)
// Message represents an end-user data packet to trasmit through the Whisper
// protocol. These are wrapped into Envelopes that need not be understood by
// intermediate nodes, just forwarded.
type Message struct {
Flags byte
Flags byte // First bit is signature presence, rest reserved and should be random
Signature []byte
Payload []byte
Sent int64
@ -18,71 +25,95 @@ type Message struct {
To *ecdsa.PublicKey
}
// Options specifies the exact way a message should be wrapped into an Envelope.
type Options struct {
From *ecdsa.PrivateKey
To *ecdsa.PublicKey
TTL time.Duration
Topics [][]byte
}
// NewMessage creates and initializes a non-signed, non-encrypted Whisper message.
func NewMessage(payload []byte) *Message {
return &Message{Flags: 0, Payload: payload, Sent: time.Now().Unix()}
// Construct an initial flag set: bit #1 = 0 (no signature), rest random
flags := byte(rand.Intn(128))
// Assemble and return the message
return &Message{
Flags: flags,
Payload: payload,
Sent: time.Now().Unix(),
}
}
func (self *Message) hash() []byte {
return crypto.Sha3(append([]byte{self.Flags}, self.Payload...))
// Wrap bundles the message into an Envelope to transmit over the network.
//
// pow (Proof Of Work) controls how much time to spend on hashing the message,
// inherently controlling its priority through the network (smaller hash, bigger
// priority).
//
// The user can control the amount of identity, privacy and encryption through
// the options parameter as follows:
// - options.From == nil && options.To == nil: anonymous broadcast
// - options.From != nil && options.To == nil: signed broadcast (known sender)
// - options.From == nil && options.To != nil: encrypted anonymous message
// - options.From != nil && options.To != nil: encrypted signed message
func (self *Message) Wrap(pow time.Duration, options Options) (*Envelope, error) {
// Use the default TTL if non was specified
if options.TTL == 0 {
options.TTL = DefaultTimeToLive
}
// Sign and encrypt the message if requested
if options.From != nil {
if err := self.sign(options.From); err != nil {
return nil, err
}
}
if options.To != nil {
if err := self.encrypt(options.To); err != nil {
return nil, err
}
}
// Wrap the processed message, seal it and return
envelope := NewEnvelope(options.TTL, options.Topics, self)
envelope.Seal(pow)
return envelope, nil
}
// sign calculates and sets the cryptographic signature for the message , also
// setting the sign flag.
func (self *Message) sign(key *ecdsa.PrivateKey) (err error) {
self.Flags = 1
self.Flags |= 1 << 7
self.Signature, err = crypto.Sign(self.hash(), key)
return
}
// Recover retrieves the public key of the message signer.
func (self *Message) Recover() *ecdsa.PublicKey {
defer func() { recover() }() // in case of invalid sig
defer func() { recover() }() // in case of invalid signature
pub, err := crypto.SigToPub(self.hash(), self.Signature)
if err != nil {
glog.V(logger.Error).Infof("Could not get pubkey from signature: ", err)
glog.V(logger.Error).Infof("Could not get public key from signature: %v", err)
return nil
}
return pub
}
func (self *Message) Encrypt(to *ecdsa.PublicKey) (err error) {
// encrypt encrypts a message payload with a public key.
func (self *Message) encrypt(to *ecdsa.PublicKey) (err error) {
self.Payload, err = crypto.Encrypt(to, self.Payload)
if err != nil {
return err
}
return nil
return
}
func (self *Message) Bytes() []byte {
// hash calculates the SHA3 checksum of the message flags and payload.
func (self *Message) hash() []byte {
return crypto.Sha3(append([]byte{self.Flags}, self.Payload...))
}
// bytes flattens the message contents (flags, signature and payload) into a
// single binary blob.
func (self *Message) bytes() []byte {
return append([]byte{self.Flags}, append(self.Signature, self.Payload...)...)
}
type Opts struct {
From *ecdsa.PrivateKey
To *ecdsa.PublicKey
Ttl time.Duration
Topics [][]byte
}
func (self *Message) Seal(pow time.Duration, opts Opts) (*Envelope, error) {
if opts.From != nil {
err := self.sign(opts.From)
if err != nil {
return nil, err
}
}
if opts.To != nil {
err := self.Encrypt(opts.To)
if err != nil {
return nil, err
}
}
if opts.Ttl == 0 {
opts.Ttl = DefaultTtl
}
envelope := NewEnvelope(opts.Ttl, opts.Topics, self)
envelope.Seal(pow)
return envelope, nil
}

138
whisper/message_test.go Normal file
View File

@ -0,0 +1,138 @@
package whisper
import (
"bytes"
"crypto/elliptic"
"testing"
"github.com/ethereum/go-ethereum/crypto"
)
// Tests whether a message can be wrapped without any identity or encryption.
func TestMessageSimpleWrap(t *testing.T) {
payload := []byte("hello world")
msg := NewMessage(payload)
if _, err := msg.Wrap(DefaultProofOfWork, Options{}); err != nil {
t.Fatalf("failed to wrap message: %v", err)
}
if msg.Flags&128 != 0 {
t.Fatalf("signature flag mismatch: have %d, want %d", (msg.Flags&128)>>7, 0)
}
if len(msg.Signature) != 0 {
t.Fatalf("signature found for simple wrapping: 0x%x", msg.Signature)
}
if bytes.Compare(msg.Payload, payload) != 0 {
t.Fatalf("payload mismatch after wrapping: have 0x%x, want 0x%x", msg.Payload, payload)
}
}
// Tests whether a message can be signed, and wrapped in plain-text.
func TestMessageCleartextSignRecover(t *testing.T) {
key, err := crypto.GenerateKey()
if err != nil {
t.Fatalf("failed to create crypto key: %v", err)
}
payload := []byte("hello world")
msg := NewMessage(payload)
if _, err := msg.Wrap(DefaultProofOfWork, Options{
From: key,
}); err != nil {
t.Fatalf("failed to sign message: %v", err)
}
if msg.Flags&128 != 128 {
t.Fatalf("signature flag mismatch: have %d, want %d", (msg.Flags&128)>>7, 1)
}
if bytes.Compare(msg.Payload, payload) != 0 {
t.Fatalf("payload mismatch after signing: have 0x%x, want 0x%x", msg.Payload, payload)
}
pubKey := msg.Recover()
if pubKey == nil {
t.Fatalf("failed to recover public key")
}
p1 := elliptic.Marshal(crypto.S256(), key.PublicKey.X, key.PublicKey.Y)
p2 := elliptic.Marshal(crypto.S256(), pubKey.X, pubKey.Y)
if !bytes.Equal(p1, p2) {
t.Fatalf("public key mismatch: have 0x%x, want 0x%x", p2, p1)
}
}
// Tests whether a message can be encrypted and decrypted using an anonymous
// sender (i.e. no signature).
func TestMessageAnonymousEncryptDecrypt(t *testing.T) {
key, err := crypto.GenerateKey()
if err != nil {
t.Fatalf("failed to create recipient crypto key: %v", err)
}
payload := []byte("hello world")
msg := NewMessage(payload)
envelope, err := msg.Wrap(DefaultProofOfWork, Options{
To: &key.PublicKey,
})
if err != nil {
t.Fatalf("failed to encrypt message: %v", err)
}
if msg.Flags&128 != 0 {
t.Fatalf("signature flag mismatch: have %d, want %d", (msg.Flags&128)>>7, 0)
}
if len(msg.Signature) != 0 {
t.Fatalf("signature found for anonymous message: 0x%x", msg.Signature)
}
out, err := envelope.Open(key)
if err != nil {
t.Fatalf("failed to open encrypted message: %v", err)
}
if !bytes.Equal(out.Payload, payload) {
t.Error("payload mismatch: have 0x%x, want 0x%x", out.Payload, payload)
}
}
// Tests whether a message can be properly signed and encrypted.
func TestMessageFullCrypto(t *testing.T) {
fromKey, err := crypto.GenerateKey()
if err != nil {
t.Fatalf("failed to create sender crypto key: %v", err)
}
toKey, err := crypto.GenerateKey()
if err != nil {
t.Fatalf("failed to create recipient crypto key: %v", err)
}
payload := []byte("hello world")
msg := NewMessage(payload)
envelope, err := msg.Wrap(DefaultProofOfWork, Options{
From: fromKey,
To: &toKey.PublicKey,
})
if err != nil {
t.Fatalf("failed to encrypt message: %v", err)
}
if msg.Flags&128 != 128 {
t.Fatalf("signature flag mismatch: have %d, want %d", (msg.Flags&128)>>7, 1)
}
if len(msg.Signature) == 0 {
t.Fatalf("no signature found for signed message")
}
out, err := envelope.Open(toKey)
if err != nil {
t.Fatalf("failed to open encrypted message: %v", err)
}
if !bytes.Equal(out.Payload, payload) {
t.Error("payload mismatch: have 0x%x, want 0x%x", out.Payload, payload)
}
pubKey := out.Recover()
if pubKey == nil {
t.Fatalf("failed to recover public key")
}
p1 := elliptic.Marshal(crypto.S256(), fromKey.PublicKey.X, fromKey.PublicKey.Y)
p2 := elliptic.Marshal(crypto.S256(), pubKey.X, pubKey.Y)
if !bytes.Equal(p1, p2) {
t.Fatalf("public key mismatch: have 0x%x, want 0x%x", p2, p1)
}
}

50
whisper/messages_test.go
View File

@ -1,50 +0,0 @@
package whisper
import (
"bytes"
"crypto/elliptic"
"fmt"
"testing"
"github.com/ethereum/go-ethereum/crypto"
)
func TestSign(t *testing.T) {
prv, _ := crypto.GenerateKey()
msg := NewMessage([]byte("hello world"))
msg.sign(prv)
pubKey := msg.Recover()
p1 := elliptic.Marshal(crypto.S256(), prv.PublicKey.X, prv.PublicKey.Y)
p2 := elliptic.Marshal(crypto.S256(), pubKey.X, pubKey.Y)
if !bytes.Equal(p1, p2) {
t.Error("recovered pub key did not match")
}
}
func TestMessageEncryptDecrypt(t *testing.T) {
prv1, _ := crypto.GenerateKey()
prv2, _ := crypto.GenerateKey()
data := []byte("hello world")
msg := NewMessage(data)
envelope, err := msg.Seal(DefaultPow, Opts{
From: prv1,
To: &prv2.PublicKey,
})
if err != nil {
fmt.Println(err)
t.FailNow()
}
msg1, err := envelope.Open(prv2)
if err != nil {
t.Error(err)
t.FailNow()
}
if !bytes.Equal(msg1.Payload, data) {
t.Error("encryption error. data did not match")
}
}

5
whisper/whisper.go
View File

@ -28,7 +28,10 @@ type MessageEvent struct {
Message *Message
}
const DefaultTtl = 50 * time.Second
const (
DefaultTimeToLive = 50 * time.Second
DefaultProofOfWork = 50 * time.Millisecond
)
type Whisper struct {
protocol p2p.Protocol

4
whisper/whisper_test.go
View File

@ -18,8 +18,8 @@ func TestEvent(t *testing.T) {
})
msg := NewMessage([]byte(fmt.Sprintf("Hello world. This is whisper-go. Incase you're wondering; the time is %v", time.Now())))
envelope, err := msg.Seal(DefaultPow, Opts{
Ttl: DefaultTtl,
envelope, err := msg.Wrap(DefaultProofOfWork, Options{
TTL: DefaultTimeToLive,
From: id,
To: &id.PublicKey,
})

4
xeth/whisper.go
View File

@ -32,8 +32,8 @@ func (self *Whisper) Post(payload string, to, from string, topics []string, prio
pk := crypto.ToECDSAPub(common.FromHex(from))
if key := self.Whisper.GetIdentity(pk); key != nil || len(from) == 0 {
msg := whisper.NewMessage(common.FromHex(payload))
envelope, err := msg.Seal(time.Duration(priority*100000), whisper.Opts{
Ttl: time.Duration(ttl) * time.Second,
envelope, err := msg.Wrap(time.Duration(priority*100000), whisper.Options{
TTL: time.Duration(ttl) * time.Second,
To: crypto.ToECDSAPub(common.FromHex(to)),
From: key,
Topics: whisper.TopicsFromString(topics...),