path: root/whisper/whisperv6/whisper_test.go

// Copyright 2016 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

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) {
    w := New(&DefaultConfig)
    p := w.Protocols()
    shh := p[0]
    if shh.Name != ProtocolName {
        t.Fatalf("failed Protocol Name: %v.", shh.Name)
    }
    if uint64(shh.Version) != ProtocolVersion {
        t.Fatalf("failed Protocol Version: %v.", shh.Version)
    }
    if shh.Length != NumberOfMessageCodes {
        t.Fatalf("failed Protocol Length: %v.", shh.Length)
    }
    if shh.Run == nil {
        t.Fatalf("failed shh.Run.")
    }
    if uint64(w.Version()) != ProtocolVersion {
        t.Fatalf("failed whisper Version: %v.", shh.Version)
    }
    if w.GetFilter("non-existent") != nil {
        t.Fatalf("failed GetFilter.")
    }

    peerID := make([]byte, 64)
    mrand.Read(peerID)
    peer, _ := w.getPeer(peerID)
    if peer != nil {
        t.Fatal("found peer for random key.")
    }
    if err := w.AllowP2PMessagesFromPeer(peerID); err == nil {
        t.Fatalf("failed MarkPeerTrusted.")
    }
    exist := w.HasSymKey("non-existing")
    if exist {
        t.Fatalf("failed HasSymKey.")
    }
    key, err := w.GetSymKey("non-existing")
    if err == nil {
        t.Fatalf("failed GetSymKey(non-existing): false positive.")
    }
    if key != nil {
        t.Fatalf("failed GetSymKey: false positive.")
    }
    mail := w.Envelopes()
    if len(mail) != 0 {
        t.Fatalf("failed w.Envelopes().")
    }
    m := w.Messages("non-existent")
    if len(m) != 0 {
        t.Fatalf("failed w.Messages.")
    }

    var derived []byte
    derived = pbkdf2.Key([]byte(peerID), nil, 65356, aesKeyLength, sha256.New)
    if !validateSymmetricKey(derived) {
        t.Fatalf("failed validateSymmetricKey with param = %v.", derived)
    }
    if containsOnlyZeros(derived) {
        t.Fatalf("failed containsOnlyZeros with param = %v.", derived)
    }

    buf := []byte{0xFF, 0xE5, 0x80, 0x2, 0}
    le := bytesToUintLittleEndian(buf)
    be := BytesToUintBigEndian(buf)
    if le != uint64(0x280e5ff) {
        t.Fatalf("failed bytesToIntLittleEndian: %d.", le)
    }
    if be != uint64(0xffe5800200) {
        t.Fatalf("failed BytesToIntBigEndian: %d.", be)
    }

    id, err := w.NewKeyPair()
    if err != nil {
        t.Fatalf("failed to generate new key pair: %s.", err)
    }
    pk, err := w.GetPrivateKey(id)
    if err != nil {
        t.Fatalf("failed to retrieve new key pair: %s.", err)
    }
    if !validatePrivateKey(pk) {
        t.Fatalf("failed validatePrivateKey: %v.", pk)
    }
    if !ValidatePublicKey(&pk.PublicKey) {
        t.Fatalf("failed ValidatePublicKey: %v.", pk)
    }
}

func TestWhisperAsymmetricKeyImport(t *testing.T) {
    var (
        w           = New(&DefaultConfig)
        privateKeys []*ecdsa.PrivateKey
    )

    for i := 0; i < 50; i++ {
        id, err := w.NewKeyPair()
        if err != nil {
            t.Fatalf("could not generate key: %v", err)
        }

        pk, err := w.GetPrivateKey(id)
        if err != nil {
            t.Fatalf("could not export private key: %v", err)
        }

        privateKeys = append(privateKeys, pk)

        if !w.DeleteKeyPair(id) {
            t.Fatalf("could not delete private key")
        }
    }

    for _, pk := range privateKeys {
        if _, err := w.AddKeyPair(pk); err != nil {
            t.Fatalf("could not import private key: %v", err)
        }
    }
}

func TestWhisperIdentityManagement(t *testing.T) {
    w := New(&DefaultConfig)
    id1, err := w.NewKeyPair()
    if err != nil {
        t.Fatalf("failed to generate new key pair: %s.", err)
    }
    id2, err := w.NewKeyPair()
    if err != nil {
        t.Fatalf("failed to generate new key pair: %s.", err)
    }
    pk1, err := w.GetPrivateKey(id1)
    if err != nil {
        t.Fatalf("failed to retrieve the key pair: %s.", err)
    }
    pk2, err := w.GetPrivateKey(id2)
    if err != nil {
        t.Fatalf("failed to retrieve the key pair: %s.", err)
    }

    if !w.HasKeyPair(id1) {
        t.Fatalf("failed HasIdentity(pk1).")
    }
    if !w.HasKeyPair(id2) {
        t.Fatalf("failed HasIdentity(pk2).")
    }
    if pk1 == nil {
        t.Fatalf("failed GetIdentity(pk1).")
    }
    if pk2 == nil {
        t.Fatalf("failed GetIdentity(pk2).")
    }

    if !validatePrivateKey(pk1) {
        t.Fatalf("pk1 is invalid.")
    }
    if !validatePrivateKey(pk2) {
        t.Fatalf("pk2 is invalid.")
    }

    // Delete one identity
    done := w.DeleteKeyPair(id1)
    if !done {
        t.Fatalf("failed to delete id1.")
    }
    pk1, err = w.GetPrivateKey(id1)
    if err == nil {
        t.Fatalf("retrieve the key pair: false positive.")
    }
    pk2, err = w.GetPrivateKey(id2)
    if err != nil {
        t.Fatalf("failed to retrieve the key pair: %s.", err)
    }
    if w.HasKeyPair(id1) {
        t.Fatalf("failed DeleteIdentity(pub1): still exist.")
    }
    if !w.HasKeyPair(id2) {
        t.Fatalf("failed DeleteIdentity(pub1): pub2 does not exist.")
    }
    if pk1 != nil {
        t.Fatalf("failed DeleteIdentity(pub1): first key still exist.")
    }
    if pk2 == nil {
        t.Fatalf("failed DeleteIdentity(pub1): second key does not exist.")
    }

    // Delete again non-existing identity
    done = w.DeleteKeyPair(id1)
    if done {
        t.Fatalf("delete id1: false positive.")
    }
    pk1, err = w.GetPrivateKey(id1)
    if err == nil {
        t.Fatalf("retrieve the key pair: false positive.")
    }
    pk2, err = w.GetPrivateKey(id2)
    if err != nil {
        t.Fatalf("failed to retrieve the key pair: %s.", err)
    }
    if w.HasKeyPair(id1) {
        t.Fatalf("failed delete non-existing identity: exist.")
    }
    if !w.HasKeyPair(id2) {
        t.Fatalf("failed delete non-existing identity: pub2 does not exist.")
    }
    if pk1 != nil {
        t.Fatalf("failed delete non-existing identity: first key exist.")
    }
    if pk2 == nil {
        t.Fatalf("failed delete non-existing identity: second key does not exist.")
    }

    // Delete second identity
    done = w.DeleteKeyPair(id2)
    if !done {
        t.Fatalf("failed to delete id2.")
    }
    pk1, err = w.GetPrivateKey(id1)
    if err == nil {
        t.Fatalf("retrieve the key pair: false positive.")
    }
    pk2, err = w.GetPrivateKey(id2)
    if err == nil {
        t.Fatalf("retrieve the key pair: false positive.")
    }
    if w.HasKeyPair(id1) {
        t.Fatalf("failed delete second identity: first identity exist.")
    }
    if w.HasKeyPair(id2) {
        t.Fatalf("failed delete second identity: still exist.")
    }
    if pk1 != nil {
        t.Fatalf("failed delete second identity: first key exist.")
    }
    if pk2 != nil {
        t.Fatalf("failed delete second identity: second key exist.")
    }
}

func TestWhisperSymKeyManagement(t *testing.T) {
    InitSingleTest()

    var err error
    var k1, k2 []byte
    w := New(&DefaultConfig)
    id1 := string("arbitrary-string-1")
    id2 := string("arbitrary-string-2")

    id1, err = w.GenerateSymKey()
    if err != nil {
        t.Fatalf("failed GenerateSymKey with seed %d: %s.", seed, err)
    }

    k1, err = w.GetSymKey(id1)
    if err != nil {
        t.Fatalf("failed GetSymKey(id1).")
    }
    k2, err = w.GetSymKey(id2)
    if err == nil {
        t.Fatalf("failed GetSymKey(id2): false positive.")
    }
    if !w.HasSymKey(id1) {
        t.Fatalf("failed HasSymKey(id1).")
    }
    if w.HasSymKey(id2) {
        t.Fatalf("failed HasSymKey(id2): false positive.")
    }
    if k1 == nil {
        t.Fatalf("first key does not exist.")
    }
    if k2 != nil {
        t.Fatalf("second key still exist.")
    }

    // add existing id, nothing should change
    randomKey := make([]byte, aesKeyLength)
    mrand.Read(randomKey)
    id1, err = w.AddSymKeyDirect(randomKey)
    if err != nil {
        t.Fatalf("failed AddSymKey with seed %d: %s.", seed, err)
    }

    k1, err = w.GetSymKey(id1)
    if err != nil {
        t.Fatalf("failed w.GetSymKey(id1).")
    }
    k2, err = w.GetSymKey(id2)
    if err == nil {
        t.Fatalf("failed w.GetSymKey(id2): false positive.")
    }
    if !w.HasSymKey(id1) {
        t.Fatalf("failed w.HasSymKey(id1).")
    }
    if w.HasSymKey(id2) {
        t.Fatalf("failed w.HasSymKey(id2): false positive.")
    }
    if k1 == nil {
        t.Fatalf("first key does not exist.")
    }
    if !bytes.Equal(k1, randomKey) {
        t.Fatalf("k1 != randomKey.")
    }
    if k2 != nil {
        t.Fatalf("second key already exist.")
    }

    id2, err = w.AddSymKeyDirect(randomKey)
    if err != nil {
        t.Fatalf("failed AddSymKey(id2) with seed %d: %s.", seed, err)
    }
    k1, err = w.GetSymKey(id1)
    if err != nil {
        t.Fatalf("failed w.GetSymKey(id1).")
    }
    k2, err = w.GetSymKey(id2)
    if err != nil {
        t.Fatalf("failed w.GetSymKey(id2).")
    }
    if !w.HasSymKey(id1) {
        t.Fatalf("HasSymKey(id1) failed.")
    }
    if !w.HasSymKey(id2) {
        t.Fatalf("HasSymKey(id2) failed.")
    }
    if k1 == nil {
        t.Fatalf("k1 does not exist.")
    }
    if k2 == nil {
        t.Fatalf("k2 does not exist.")
    }
    if !bytes.Equal(k1, k2) {
        t.Fatalf("k1 != k2.")
    }
    if !bytes.Equal(k1, randomKey) {
        t.Fatalf("k1 != randomKey.")
    }
    if len(k1) != aesKeyLength {
        t.Fatalf("wrong length of k1.")
    }
    if len(k2) != aesKeyLength {
        t.Fatalf("wrong length of k2.")
    }

    w.DeleteSymKey(id1)
    k1, err = w.GetSymKey(id1)
    if err == nil {
        t.Fatalf("failed w.GetSymKey(id1): false positive.")
    }
    if k1 != nil {
        t.Fatalf("failed GetSymKey(id1): false positive.")
    }
    k2, err = w.GetSymKey(id2)
    if err != nil {
        t.Fatalf("failed w.GetSymKey(id2).")
    }
    if w.HasSymKey(id1) {
        t.Fatalf("failed to delete first key: still exist.")
    }
    if !w.HasSymKey(id2) {
        t.Fatalf("failed to delete first key: second key does not exist.")
    }
    if k1 != nil {
        t.Fatalf("failed to delete first key.")
    }
    if k2 == nil {
        t.Fatalf("failed to delete first key: second key is nil.")
    }

    w.DeleteSymKey(id1)
    w.DeleteSymKey(id2)
    k1, err = w.GetSymKey(id1)
    if err == nil {
        t.Fatalf("failed w.GetSymKey(id1): false positive.")
    }
    k2, err = w.GetSymKey(id2)
    if err == nil {
        t.Fatalf("failed w.GetSymKey(id2): false positive.")
    }
    if k1 != nil || k2 != nil {
        t.Fatalf("k1 or k2 is not nil")
    }
    if w.HasSymKey(id1) {
        t.Fatalf("failed to delete second key: first key exist.")
    }
    if w.HasSymKey(id2) {
        t.Fatalf("failed to delete second key: still exist.")
    }
    if k1 != nil {
        t.Fatalf("failed to delete second key: first key is not nil.")
    }
    if k2 != nil {
        t.Fatalf("failed to delete second key: second key is not nil.")
    }

    randomKey = make([]byte, aesKeyLength+1)
    mrand.Read(randomKey)
    _, err = w.AddSymKeyDirect(randomKey)
    if err == nil {
        t.Fatalf("added the key with wrong size, seed %d.", seed)
    }

    const password = "arbitrary data here"
    id1, err = w.AddSymKeyFromPassword(password)
    if err != nil {
        t.Fatalf("failed AddSymKeyFromPassword(id1) with seed %d: %s.", seed, err)
    }
    id2, err = w.AddSymKeyFromPassword(password)
    if err != nil {
        t.Fatalf("failed AddSymKeyFromPassword(id2) with seed %d: %s.", seed, err)
    }
    k1, err = w.GetSymKey(id1)
    if err != nil {
        t.Fatalf("failed w.GetSymKey(id1).")
    }
    k2, err = w.GetSymKey(id2)
    if err != nil {
        t.Fatalf("failed w.GetSymKey(id2).")
    }
    if !w.HasSymKey(id1) {
        t.Fatalf("HasSymKey(id1) failed.")
    }
    if !w.HasSymKey(id2) {
        t.Fatalf("HasSymKey(id2) failed.")
    }
    if k1 == nil {
        t.Fatalf("k1 does not exist.")
    }
    if k2 == nil {
        t.Fatalf("k2 does not exist.")
    }
    if !bytes.Equal(k1, k2) {
        t.Fatalf("k1 != k2.")
    }
    if len(k1) != aesKeyLength {
        t.Fatalf("wrong length of k1.")
    }
    if len(k2) != aesKeyLength {
        t.Fatalf("wrong length of k2.")
    }
    if !validateSymmetricKey(k2) {
        t.Fatalf("key validation failed.")
    }
}

func TestExpiry(t *testing.T) {
    InitSingleTest()

    w := New(&DefaultConfig)
    w.SetMinimumPoW(0.0000001)
    defer w.SetMinimumPoW(DefaultMinimumPoW)
    w.Start(nil)
    defer w.Stop()

    params, err := generateMessageParams()
    if err != nil {
        t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
    }

    params.TTL = 1
    msg, err := NewSentMessage(params)
    if err != nil {
        t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
    }
    env, err := msg.Wrap(params)
    if err != nil {
        t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
    }

    err = w.Send(env)
    if err != nil {
        t.Fatalf("failed to send envelope with seed %d: %s.", seed, err)
    }

    // wait till received or timeout
    var received, expired bool
    for j := 0; j < 20; j++ {
        time.Sleep(100 * time.Millisecond)
        if len(w.Envelopes()) > 0 {
            received = true
            break
        }
    }

    if !received {
        t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
    }

    // wait till expired or timeout
    for j := 0; j < 20; j++ {
        time.Sleep(100 * time.Millisecond)
        if len(w.Envelopes()) == 0 {
            expired = true
            break
        }
    }

    if !expired {
        t.Fatalf("expire failed, seed: %d.", seed)
    }
}

func TestCustomization(t *testing.T) {
    InitSingleTest()

    w := New(&DefaultConfig)
    defer w.SetMinimumPoW(DefaultMinimumPoW)
    defer w.SetMaxMessageSize(DefaultMaxMessageSize)
    w.Start(nil)
    defer w.Stop()

    const smallPoW = 0.00001

    f, err := generateFilter(t, true)
    if err != nil {
        t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
    }
    params, err := generateMessageParams()
    if err != nil {
        t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
    }

    params.KeySym = f.KeySym
    params.Topic = BytesToTopic(f.Topics[2])
    params.PoW = smallPoW
    params.TTL = 3600 * 24 // one day
    msg, err := NewSentMessage(params)
    if err != nil {
        t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
    }
    env, err := msg.Wrap(params)
    if err != nil {
        t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
    }

    err = w.Send(env)
    if err == nil {
        t.Fatalf("successfully sent envelope with PoW %.06f, false positive (seed %d).", env.PoW(), seed)
    }

    w.SetMinimumPoW(smallPoW / 2)
    err = w.Send(env)
    if err != nil {
        t.Fatalf("failed to send envelope with seed %d: %s.", seed, err)
    }

    params.TTL++
    msg, err = NewSentMessage(params)
    if err != nil {
        t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
    }
    env, err = msg.Wrap(params)
    if err != nil {
        t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
    }
    w.SetMaxMessageSize(uint32(env.size() - 1))
    err = w.Send(env)
    if err == nil {
        t.Fatalf("successfully sent oversized envelope (seed %d): false positive.", seed)
    }

    w.SetMaxMessageSize(DefaultMaxMessageSize)
    err = w.Send(env)
    if err != nil {
        t.Fatalf("failed to send second envelope with seed %d: %s.", seed, err)
    }

    // wait till received or timeout
    var received bool
    for j := 0; j < 20; j++ {
        time.Sleep(100 * time.Millisecond)
        if len(w.Envelopes()) > 1 {
            received = true
            break
        }
    }

    if !received {
        t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
    }

    // check w.messages()
    id, err := w.Subscribe(f)
    if err != nil {
        t.Fatalf("failed subscribe with seed %d: %s.", seed, err)
    }
    time.Sleep(5 * time.Millisecond)
    mail := f.Retrieve()
    if len(mail) > 0 {
        t.Fatalf("received premature mail")
    }

    mail = w.Messages(id)
    if len(mail) != 2 {
        t.Fatalf("failed to get whisper messages")
    }
}

func TestSymmetricSendCycle(t *testing.T) {
    InitSingleTest()

    w := New(&DefaultConfig)
    defer w.SetMinimumPoW(DefaultMinimumPoW)
    defer w.SetMaxMessageSize(DefaultMaxMessageSize)
    w.Start(nil)
    defer w.Stop()

    filter1, err := generateFilter(t, true)
    if err != nil {
        t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
    }
    filter1.PoW = DefaultMinimumPoW

    // Copy the first filter since some of its fields
    // are randomly gnerated.
    filter2 := &Filter{
        KeySym:   filter1.KeySym,
        Topics:   filter1.Topics,
        PoW:      filter1.PoW,
        AllowP2P: filter1.AllowP2P,
        Messages: make(map[common.Hash]*ReceivedMessage),
    }

    params, err := generateMessageParams()
    if err != nil {
        t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
    }

    filter1.Src = &params.Src.PublicKey
    filter2.Src = &params.Src.PublicKey

    params.KeySym = filter1.KeySym
    params.Topic = BytesToTopic(filter1.Topics[2])
    params.PoW = filter1.PoW
    params.WorkTime = 10
    params.TTL = 50
    msg, err := NewSentMessage(params)
    if err != nil {
        t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
    }
    env, err := msg.Wrap(params)
    if err != nil {
        t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
    }

    _, err = w.Subscribe(filter1)
    if err != nil {
        t.Fatalf("failed subscribe 1 with seed %d: %s.", seed, err)
    }

    _, err = w.Subscribe(filter2)
    if err != nil {
        t.Fatalf("failed subscribe 2 with seed %d: %s.", seed, err)
    }

    err = w.Send(env)
    if err != nil {
        t.Fatalf("Failed sending envelope with PoW %.06f (seed %d): %s", env.PoW(), seed, err)
    }

    // wait till received or timeout
    var received bool
    for j := 0; j < 200; j++ {
        time.Sleep(10 * time.Millisecond)
        if len(w.Envelopes()) > 0 {
            received = true
            break
        }
    }

    if !received {
        t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
    }

    // check w.messages()
    time.Sleep(5 * time.Millisecond)
    mail1 := filter1.Retrieve()
    mail2 := filter2.Retrieve()
    if len(mail2) == 0 {
        t.Fatalf("did not receive any email for filter 2")
    }
    if len(mail1) == 0 {
        t.Fatalf("did not receive any email for filter 1")
    }

}

func TestSymmetricSendWithoutAKey(t *testing.T) {
    InitSingleTest()

    w := New(&DefaultConfig)
    defer w.SetMinimumPoW(DefaultMinimumPoW)
    defer w.SetMaxMessageSize(DefaultMaxMessageSize)
    w.Start(nil)
    defer w.Stop()

    filter, err := generateFilter(t, true)
    if err != nil {
        t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
    }
    filter.PoW = DefaultMinimumPoW

    params, err := generateMessageParams()
    if err != nil {
        t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
    }

    filter.Src = nil

    params.KeySym = filter.KeySym
    params.Topic = BytesToTopic(filter.Topics[2])
    params.PoW = filter.PoW
    params.WorkTime = 10
    params.TTL = 50
    msg, err := NewSentMessage(params)
    if err != nil {
        t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
    }
    env, err := msg.Wrap(params)
    if err != nil {
        t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
    }

    _, err = w.Subscribe(filter)
    if err != nil {
        t.Fatalf("failed subscribe 1 with seed %d: %s.", seed, err)
    }

    err = w.Send(env)
    if err != nil {
        t.Fatalf("Failed sending envelope with PoW %.06f (seed %d): %s", env.PoW(), seed, err)
    }

    // wait till received or timeout
    var received bool
    for j := 0; j < 200; j++ {
        time.Sleep(10 * time.Millisecond)
        if len(w.Envelopes()) > 0 {
            received = true
            break
        }
    }

    if !received {
        t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
    }

    // check w.messages()
    time.Sleep(5 * time.Millisecond)
    mail := filter.Retrieve()
    if len(mail) == 0 {
        t.Fatalf("did not receive message in spite of not setting a public key")
    }
}

func TestSymmetricSendKeyMismatch(t *testing.T) {
    InitSingleTest()

    w := New(&DefaultConfig)
    defer w.SetMinimumPoW(DefaultMinimumPoW)
    defer w.SetMaxMessageSize(DefaultMaxMessageSize)
    w.Start(nil)
    defer w.Stop()

    filter, err := generateFilter(t, true)
    if err != nil {
        t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
    }
    filter.PoW = DefaultMinimumPoW

    params, err := generateMessageParams()
    if err != nil {
        t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
    }

    params.KeySym = filter.KeySym
    params.Topic = BytesToTopic(filter.Topics[2])
    params.PoW = filter.PoW
    params.WorkTime = 10
    params.TTL = 50
    msg, err := NewSentMessage(params)
    if err != nil {
        t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
    }
    env, err := msg.Wrap(params)
    if err != nil {
        t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
    }

    _, err = w.Subscribe(filter)
    if err != nil {
        t.Fatalf("failed subscribe 1 with seed %d: %s.", seed, err)
    }

    err = w.Send(env)
    if err != nil {
        t.Fatalf("Failed sending envelope with PoW %.06f (seed %d): %s", env.PoW(), seed, err)
    }

    // wait till received or timeout
    var received bool
    for j := 0; j < 200; j++ {
        time.Sleep(10 * time.Millisecond)
        if len(w.Envelopes()) > 0 {
            received = true
            break
        }
    }

    if !received {
        t.Fatalf("did not receive the sent envelope, seed: %d.", seed)
    }

    // check w.messages()
    time.Sleep(5 * time.Millisecond)
    mail := filter.Retrieve()
    if len(mail) > 0 {
        t.Fatalf("received a message when keys weren't matching")
    }
}