5 files changed, 28 insertions, 65 deletions

diff --git a/whisper/whisperv6/benchmarks_test.go b/whisper/whisperv6/benchmarks_test.go
index 9f413e7b0..0473179da 100644
--- a/whisper/whisperv6/benchmarks_test.go
+++ b/whisper/whisperv6/benchmarks_test.go
@@ -17,14 +17,16 @@
 package whisperv6
 
 import (
+	"crypto/sha256"
 	"testing"
 
 	"github.com/ethereum/go-ethereum/crypto"
+	"golang.org/x/crypto/pbkdf2"
 )
 
 func BenchmarkDeriveKeyMaterial(b *testing.B) {
 	for i := 0; i < b.N; i++ {
-		deriveKeyMaterial([]byte("test"), 0)
+		pbkdf2.Key([]byte("test"), nil, 65356, aesKeyLength, sha256.New)
 	}
 }
 
diff --git a/whisper/whisperv6/envelope.go b/whisper/whisperv6/envelope.go
index c8b56ff36..676df669b 100644
--- a/whisper/whisperv6/envelope.go
+++ b/whisper/whisperv6/envelope.go
@@ -36,12 +36,11 @@ import (
 // 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 {
-	Version []byte
-	Expiry  uint32
-	TTL     uint32
-	Topic   TopicType
-	Data    []byte
-	Nonce   uint64
+	Expiry uint32
+	TTL    uint32
+	Topic  TopicType
+	Data   []byte
+	Nonce  uint64
 
 	pow  float64     // Message-specific PoW as described in the Whisper specification.
 	hash common.Hash // Cached hash of the envelope to avoid rehashing every time.
@@ -50,12 +49,12 @@ type Envelope struct {
 
 // size returns the size of envelope as it is sent (i.e. public fields only)
 func (e *Envelope) size() int {
-	return EnvelopeHeaderLength + len(e.Version) + len(e.Data)
+	return EnvelopeHeaderLength + len(e.Data)
 }
 
 // rlpWithoutNonce returns the RLP encoded envelope contents, except the nonce.
 func (e *Envelope) rlpWithoutNonce() []byte {
-	res, _ := rlp.EncodeToBytes([]interface{}{e.Version, e.Expiry, e.TTL, e.Topic, e.Data})
+	res, _ := rlp.EncodeToBytes([]interface{}{e.Expiry, e.TTL, e.Topic, e.Data})
 	return res
 }
 
@@ -63,27 +62,16 @@ func (e *Envelope) rlpWithoutNonce() []byte {
 // included into an envelope for network forwarding.
 func NewEnvelope(ttl uint32, topic TopicType, msg *sentMessage) *Envelope {
 	env := Envelope{
-		Version: make([]byte, 1),
-		Expiry:  uint32(time.Now().Add(time.Second * time.Duration(ttl)).Unix()),
-		TTL:     ttl,
-		Topic:   topic,
-		Data:    msg.Raw,
-		Nonce:   0,
-	}
-
-	if EnvelopeVersion < 256 {
-		env.Version[0] = byte(EnvelopeVersion)
-	} else {
-		panic("please increase the size of Envelope.Version before releasing this version")
+		Expiry: uint32(time.Now().Add(time.Second * time.Duration(ttl)).Unix()),
+		TTL:    ttl,
+		Topic:  topic,
+		Data:   msg.Raw,
+		Nonce:  0,
 	}
 
 	return &env
 }
 
-func (e *Envelope) Ver() uint64 {
-	return bytesToUintLittleEndian(e.Version)
-}
-
 // Seal closes the envelope by spending the requested amount of time as a proof
 // of work on hashing the data.
 func (e *Envelope) Seal(options *MessageParams) error {
@@ -236,7 +224,6 @@ func (e *Envelope) Open(watcher *Filter) (msg *ReceivedMessage) {
 		msg.TTL = e.TTL
 		msg.Sent = e.Expiry - e.TTL
 		msg.EnvelopeHash = e.Hash()
-		msg.EnvelopeVersion = e.Ver()
 	}
 	return msg
 }
diff --git a/whisper/whisperv6/message.go b/whisper/whisperv6/message.go
index 2f39afda6..63bcdd85e 100644
--- a/whisper/whisperv6/message.go
+++ b/whisper/whisperv6/message.go
@@ -70,9 +70,8 @@ type ReceivedMessage struct {
 	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
+	SymKeyHash   common.Hash // The Keccak256Hash of the key, associated with the Topic
+	EnvelopeHash common.Hash // Message envelope hash to act as a unique id
 }
 
 func isMessageSigned(flags byte) bool {
diff --git a/whisper/whisperv6/whisper.go b/whisper/whisperv6/whisper.go
index 0ed82a0ff..d09baab3f 100644
--- a/whisper/whisperv6/whisper.go
+++ b/whisper/whisperv6/whisper.go
@@ -367,7 +367,9 @@ func (w *Whisper) AddSymKeyFromPassword(password string) (string, error) {
 		return "", fmt.Errorf("failed to generate unique ID")
 	}
 
-	derived, err := deriveKeyMaterial([]byte(password), EnvelopeVersion)
+	// kdf should run no less than 0.1 seconds on an average computer,
+	// because it's an once in a session experience
+	derived := pbkdf2.Key([]byte(password), nil, 65356, aesKeyLength, sha256.New)
 	if err != nil {
 		return "", err
 	}
@@ -587,10 +589,6 @@ func (wh *Whisper) add(envelope *Envelope) (bool, error) {
 		return false, fmt.Errorf("huge messages are not allowed [%x]", envelope.Hash())
 	}
 
-	if len(envelope.Version) > 4 {
-		return false, fmt.Errorf("oversized version [%x]", envelope.Hash())
-	}
-
 	if envelope.PoW() < wh.MinPow() {
 		log.Debug("envelope with low PoW dropped", "PoW", envelope.PoW(), "hash", envelope.Hash().Hex())
 		return false, nil // drop envelope without error
@@ -628,16 +626,11 @@ func (wh *Whisper) add(envelope *Envelope) (bool, error) {
 
 // postEvent queues the message for further processing.
 func (w *Whisper) postEvent(envelope *Envelope, isP2P bool) {
-	// if the version of incoming message is higher than
-	// currently supported version, we can not decrypt it,
-	// and therefore just ignore this message
-	if envelope.Ver() <= EnvelopeVersion {
-		if isP2P {
-			w.p2pMsgQueue <- envelope
-		} else {
-			w.checkOverflow()
-			w.messageQueue <- envelope
-		}
+	if isP2P {
+		w.p2pMsgQueue <- envelope
+	} else {
+		w.checkOverflow()
+		w.messageQueue <- envelope
 	}
 }
 
@@ -823,19 +816,6 @@ func BytesToUintBigEndian(b []byte) (res uint64) {
 	return res
 }
 
-// deriveKeyMaterial derives symmetric key material from the key or password.
-// pbkdf2 is used for security, in case people use password instead of randomly generated keys.
-func deriveKeyMaterial(key []byte, version uint64) (derivedKey []byte, err error) {
-	if version == 0 {
-		// kdf should run no less than 0.1 seconds on average compute,
-		// because it's a once in a session experience
-		derivedKey := pbkdf2.Key(key, nil, 65356, aesKeyLength, sha256.New)
-		return derivedKey, nil
-	} else {
-		return nil, unknownVersionError(version)
-	}
-}
-
 // GenerateRandomID generates a random string, which is then returned to be used as a key id
 func GenerateRandomID() (id string, err error) {
 	buf := make([]byte, keyIdSize)
diff --git a/whisper/whisperv6/whisper_test.go b/whisper/whisperv6/whisper_test.go
index c7cea4014..aeb54b3ab 100644
--- a/whisper/whisperv6/whisper_test.go
+++ b/whisper/whisperv6/whisper_test.go
@@ -19,11 +19,13 @@ package whisperv6
 import (
 	"bytes"
 	"crypto/ecdsa"
+	"crypto/sha256"
 	mrand "math/rand"
 	"testing"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
+	"golang.org/x/crypto/pbkdf2"
 )
 
 func TestWhisperBasic(t *testing.T) {
@@ -79,14 +81,7 @@ func TestWhisperBasic(t *testing.T) {
 	}
 
 	var derived []byte
-	ver := uint64(0xDEADBEEF)
-	if _, err := deriveKeyMaterial(peerID, ver); err != unknownVersionError(ver) {
-		t.Fatalf("failed deriveKeyMaterial with param = %v: %s.", peerID, err)
-	}
-	derived, err = deriveKeyMaterial(peerID, 0)
-	if err != nil {
-		t.Fatalf("failed second deriveKeyMaterial with param = %v: %s.", peerID, err)
-	}
+	derived = pbkdf2.Key([]byte(peerID), nil, 65356, aesKeyLength, sha256.New)
 	if !validateSymmetricKey(derived) {
 		t.Fatalf("failed validateSymmetricKey with param = %v.", derived)
 	}