// 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/aes"
"crypto/cipher"
mrand "math/rand"
"testing"
"github.com/dexon-foundation/dexon/common/hexutil"
"github.com/dexon-foundation/dexon/crypto"
"github.com/dexon-foundation/dexon/rlp"
)
func generateMessageParams() (*MessageParams, error) {
// set all the parameters except p.Dst and p.Padding
buf := make([]byte, 4)
mrand.Read(buf)
sz := mrand.Intn(400)
var p MessageParams
p.PoW = 0.01
p.WorkTime = 1
p.TTL = uint32(mrand.Intn(1024))
p.Payload = make([]byte, sz)
p.KeySym = make([]byte, aesKeyLength)
mrand.Read(p.Payload)
mrand.Read(p.KeySym)
p.Topic = BytesToTopic(buf)
var err error
p.Src, err = crypto.GenerateKey()
if err != nil {
return nil, err
}
return &p, nil
}
func singleMessageTest(t *testing.T, symmetric bool) {
params, err := generateMessageParams()
if err != nil {
t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
}
key, err := crypto.GenerateKey()
if err != nil {
t.Fatalf("failed GenerateKey with seed %d: %s.", seed, err)
}
if !symmetric {
params.KeySym = nil
params.Dst = &key.PublicKey
}
text := make([]byte, 0, 512)
text = append(text, params.Payload...)
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)
}
var decrypted *ReceivedMessage
if symmetric {
decrypted, err = env.OpenSymmetric(params.KeySym)
} else {
decrypted, err = env.OpenAsymmetric(key)
}
if err != nil {
t.Fatalf("failed to encrypt with seed %d: %s.", seed, err)
}
if !decrypted.ValidateAndParse() {
t.Fatalf("failed to validate with seed %d, symmetric = %v.", seed, symmetric)
}
if !bytes.Equal(text, decrypted.Payload) {
t.Fatalf("failed with seed %d: compare payload.", seed)
}
if !isMessageSigned(decrypted.Raw[0]) {
t.Fatalf("failed with seed %d: unsigned.", seed)
}
if len(decrypted.Signature) != signatureLength {
t.Fatalf("failed with seed %d: signature len %d.", seed, len(decrypted.Signature))
}
if !IsPubKeyEqual(decrypted.Src, ¶ms.Src.PublicKey) {
t.Fatalf("failed with seed %d: signature mismatch.", seed)
}
}
func TestMessageEncryption(t *testing.T) {
InitSingleTest()
var symmetric bool
for i := 0; i < 256; i++ {
singleMessageTest(t, symmetric)
symmetric = !symmetric
}
}
func TestMessageWrap(t *testing.T) {
seed = int64(1777444222)
mrand.Seed(seed)
target := 128.0
params, err := generateMessageParams()
if err != nil {
t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
}
msg, err := NewSentMessage(params)
if err != nil {
t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
}
params.TTL = 1
params.WorkTime = 12
params.PoW = target
env, err := msg.Wrap(params)
if err != nil {
t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
}
pow := env.PoW()
if pow < target {
t.Fatalf("failed Wrap with seed %d: pow < target (%f vs. %f).", seed, pow, target)
}
// set PoW target too high, expect error
msg2, err := NewSentMessage(params)
if err != nil {
t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
}
params.TTL = 1000000
params.WorkTime = 1
params.PoW = 10000000.0
_, err = msg2.Wrap(params)
if err == nil {
t.Fatalf("unexpectedly reached the PoW target with seed %d.", seed)
}
}
func TestMessageSeal(t *testing.T) {
// this test depends on deterministic choice of seed (1976726903)
seed = int64(1976726903)
mrand.Seed(seed)
params, err := generateMessageParams()
if err != nil {
t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
}
msg, err := NewSentMessage(params)
if err != nil {
t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
}
params.TTL = 1
env := NewEnvelope(params.TTL, params.Topic, msg)
if err != nil {
t.Fatalf("failed Wrap with seed %d: %s.", seed, err)
}
env.Expiry = uint32(seed) // make it deterministic
target := 32.0
params.WorkTime = 4
params.PoW = target
env.Seal(params)
env.calculatePoW(0)
pow := env.PoW()
if pow < target {
t.Fatalf("failed Wrap with seed %d: pow < target (%f vs. %f).", seed, pow, target)
}
params.WorkTime = 1
params.PoW = 1000000000.0
env.Seal(params)
env.calculatePoW(0)
pow = env.PoW()
if pow < 2*target {
t.Fatalf("failed Wrap with seed %d: pow too small %f.", seed, pow)
}
}
func TestEnvelopeOpen(t *testing.T) {
InitSingleTest()
var symmetric bool
for i := 0; i < 32; i++ {
singleEnvelopeOpenTest(t, symmetric)
symmetric = !symmetric
}
}
func singleEnvelopeOpenTest(t *testing.T, symmetric bool) {
params, err := generateMessageParams()
if err != nil {
t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
}
key, err := crypto.GenerateKey()
if err != nil {
t.Fatalf("failed GenerateKey with seed %d: %s.", seed, err)
}
if !symmetric {
params.KeySym = nil
params.Dst = &key.PublicKey
}
text := make([]byte, 0, 512)
text = append(text, params.Payload...)
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)
}
var f Filter
if symmetric {
f = Filter{KeySym: params.KeySym}
} else {
f = Filter{KeyAsym: key}
}
decrypted := env.Open(&f)
if decrypted == nil {
t.Fatalf("failed to open with seed %d.", seed)
}
if !bytes.Equal(text, decrypted.Payload) {
t.Fatalf("failed with seed %d: compare payload.", seed)
}
if !isMessageSigned(decrypted.Raw[0]) {
t.Fatalf("failed with seed %d: unsigned.", seed)
}
if len(decrypted.Signature) != signatureLength {
t.Fatalf("failed with seed %d: signature len %d.", seed, len(decrypted.Signature))
}
if !IsPubKeyEqual(decrypted.Src, ¶ms.Src.PublicKey) {
t.Fatalf("failed with seed %d: signature mismatch.", seed)
}
if decrypted.isAsymmetricEncryption() == symmetric {
t.Fatalf("failed with seed %d: asymmetric %v vs. %v.", seed, decrypted.isAsymmetricEncryption(), symmetric)
}
if decrypted.isSymmetricEncryption() != symmetric {
t.Fatalf("failed with seed %d: symmetric %v vs. %v.", seed, decrypted.isSymmetricEncryption(), symmetric)
}
if !symmetric {
if decrypted.Dst == nil {
t.Fatalf("failed with seed %d: dst is nil.", seed)
}
if !IsPubKeyEqual(decrypted.Dst, &key.PublicKey) {
t.Fatalf("failed with seed %d: Dst.", seed)
}
}
}
func TestEncryptWithZeroKey(t *testing.T) {
InitSingleTest()
params, err := generateMessageParams()
if err != nil {
t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
}
msg, err := NewSentMessage(params)
if err != nil {
t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
}
params.KeySym = make([]byte, aesKeyLength)
_, err = msg.Wrap(params)
if err == nil {
t.Fatalf("wrapped with zero key, seed: %d.", seed)
}
params, err = generateMessageParams()
if err != nil {
t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
}
msg, err = NewSentMessage(params)
if err != nil {
t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
}
params.KeySym = make([]byte, 0)
_, err = msg.Wrap(params)
if err == nil {
t.Fatalf("wrapped with empty key, seed: %d.", seed)
}
params, err = generateMessageParams()
if err != nil {
t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
}
msg, err = NewSentMessage(params)
if err != nil {
t.Fatalf("failed to create new message with seed %d: %s.", seed, err)
}
params.KeySym = nil
_, err = msg.Wrap(params)
if err == nil {
t.Fatalf("wrapped with nil key, seed: %d.", seed)
}
}
func TestRlpEncode(t *testing.T) {
InitSingleTest()
params, err := generateMessageParams()
if err != nil {
t.Fatalf("failed generateMessageParams with seed %d: %s.", seed, err)
}
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("wrapped with zero key, seed: %d.", seed)
}
raw, err := rlp.EncodeToBytes(env)
if err != nil {
t.Fatalf("RLP encode failed: %s.", err)
}
var decoded Envelope
rlp.DecodeBytes(raw, &decoded)
if err != nil {
t.Fatalf("RLP decode failed: %s.", err)
}
he := env.Hash()
hd := decoded.Hash()
if he != hd {
t.Fatalf("Hashes are not equal: %x vs. %x", he, hd)
}
}
func singlePaddingTest(t *testing.T, padSize int) {
params, err := generateMessageParams()
if err != nil {
t.Fatalf("failed generateMessageParams with seed %d and sz=%d: %s.", seed, padSize, err)
}
params.Padding = make([]byte, padSize)
params.PoW = 0.0000000001
pad := make([]byte, padSize)
_, err = mrand.Read(pad)
if err != nil {
t.Fatalf("padding is not generated (seed %d): %s", seed, err)
}
n := copy(params.Padding, pad)
if n != padSize {
t.Fatalf("padding is not copied (seed %d): %s", seed, err)
}
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 to wrap, seed: %d and sz=%d.", seed, padSize)
}
f := Filter{KeySym: params.KeySym}
decrypted := env.Open(&f)
if decrypted == nil {
t.Fatalf("failed to open, seed and sz=%d: %d.", seed, padSize)
}
if !bytes.Equal(pad, decrypted.Padding) {
t.Fatalf("padding is not retireved as expected with seed %d and sz=%d:\n[%x]\n[%x].", seed, padSize, pad, decrypted.Padding)
}
}
func TestPadding(t *testing.T) {
InitSingleTest()
for i := 1; i < 260; i++ {
singlePaddingTest(t, i)
}
lim := 256 * 256
for i := lim - 5; i < lim+2; i++ {
singlePaddingTest(t, i)
}
for i := 0; i < 256; i++ {
n := mrand.Intn(256*254) + 256
singlePaddingTest(t, n)
}
for i := 0; i < 256; i++ {
n := mrand.Intn(256*1024) + 256*256
singlePaddingTest(t, n)
}
}
func TestPaddingAppendedToSymMessagesWithSignature(t *testing.T) {
params := &MessageParams{
Payload: make([]byte, 246),
KeySym: make([]byte, aesKeyLength),
}
pSrc, err := crypto.GenerateKey()
if err != nil {
t.Fatalf("Error creating the signature key %v", err)
return
}
params.Src = pSrc
// Simulate a message with a payload just under 256 so that
// payload + flag + signature > 256. Check that the result
// is padded on the next 256 boundary.
msg := sentMessage{}
const payloadSizeFieldMinSize = 1
msg.Raw = make([]byte, flagsLength+payloadSizeFieldMinSize+len(params.Payload))
err = msg.appendPadding(params)
if err != nil {
t.Fatalf("Error appending padding to message %v", err)
return
}
if len(msg.Raw) != 512-signatureLength {
t.Errorf("Invalid size %d != 512", len(msg.Raw))
}
}
func TestAesNonce(t *testing.T) {
key := hexutil.MustDecode("0x03ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd31")
block, err := aes.NewCipher(key)
if err != nil {
t.Fatalf("NewCipher failed: %s", err)
}
aesgcm, err := cipher.NewGCM(block)
if err != nil {
t.Fatalf("NewGCM failed: %s", err)
}
// This is the most important single test in this package.
// If it fails, whisper will not be working.
if aesgcm.NonceSize() != aesNonceLength {
t.Fatalf("Nonce size is wrong. This is a critical error. Apparently AES nonce size have changed in the new version of AES GCM package. Whisper will not be working until this problem is resolved.")
}
}
