3 files changed, 41 insertions, 2 deletions
diff --git a/whisper/envelope.go b/whisper/envelope.go
index ba3e4ccc9..c1d84df78 100644
--- a/whisper/envelope.go
+++ b/whisper/envelope.go
@@ -73,6 +73,7 @@ func (self *Envelope) Open(key *ecdsa.PrivateKey) (msg *Message, err error) {
 	message := &Message{
 		Flags: data[0],
 		Sent:  int64(self.Expiry - self.TTL),
+		Hash:  self.Hash(),
 	}
 	data = data[1:]
 
diff --git a/whisper/envelope_test.go b/whisper/envelope_test.go
new file mode 100644
index 000000000..ed1f08365
--- /dev/null
+++ b/whisper/envelope_test.go
@@ -0,0 +1,36 @@
+package whisper
+
+import (
+	"bytes"
+	"testing"
+)
+
+func TestEnvelopeOpen(t *testing.T) {
+	payload := []byte("hello world")
+	message := NewMessage(payload)
+
+	envelope, err := message.Wrap(DefaultPoW, Options{})
+	if err != nil {
+		t.Fatalf("failed to wrap message: %v", err)
+	}
+	opened, err := envelope.Open(nil)
+	if err != nil {
+		t.Fatalf("failed to open envelope: %v.", err)
+	}
+	if opened.Flags != message.Flags {
+		t.Fatalf("flags mismatch: have %d, want %d", opened.Flags, message.Flags)
+	}
+	if bytes.Compare(opened.Signature, message.Signature) != 0 {
+		t.Fatalf("signature mismatch: have 0x%x, want 0x%x", opened.Signature, message.Signature)
+	}
+	if bytes.Compare(opened.Payload, message.Payload) != 0 {
+		t.Fatalf("payload mismatch: have 0x%x, want 0x%x", opened.Payload, message.Payload)
+	}
+	if opened.Sent != message.Sent {
+		t.Fatalf("send time mismatch: have %d, want %d", opened.Sent, message.Sent)
+	}
+
+	if opened.Hash != envelope.Hash() {
+		t.Fatalf("message hash mismatch: have 0x%x, want 0x%x", opened.Hash, envelope.Hash())
+	}
+}
diff --git a/whisper/message.go b/whisper/message.go
index 07c673567..69d85b894 100644
--- a/whisper/message.go
+++ b/whisper/message.go
@@ -8,12 +8,13 @@ import (
 	"math/rand"
 	"time"
 
+	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/logger"
 	"github.com/ethereum/go-ethereum/logger/glog"
 )
 
-// Message represents an end-user data packet to trasmit through the Whisper
+// Message represents an end-user data packet to transmit through the Whisper
 // protocol. These are wrapped into Envelopes that need not be understood by
 // intermediate nodes, just forwarded.
 type Message struct {
@@ -22,7 +23,8 @@ type Message struct {
 	Payload   []byte
 	Sent      int64
 
-	To *ecdsa.PublicKey
+	To   *ecdsa.PublicKey // Message recipient (identity used to decode the message)
+	Hash common.Hash      // Message envelope hash to act as a unique id in de-duplication
 }
 
 // Options specifies the exact way a message should be wrapped into an Envelope.