go-waku/waku/v2/node/waku_payload_crypto_test.go

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2021-10-21 15:56:18 +00:00
package node
import (
"crypto/aes"
"crypto/cipher"
mrand "math/rand"
"testing"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/crypto"
"github.com/stretchr/testify/require"
)
func singleMessageTest(t *testing.T, symmetric bool) {
message := createTestMsg(1)
data := message.Payload
var err error
keyInfo := new(KeyInfo)
keyInfo.PrivKey, err = crypto.GenerateKey()
require.NoError(t, err)
if symmetric {
keyInfo.Kind = Symmetric
keyInfo.SymKey, err = generateSymKey()
require.NoError(t, err)
} else {
keyInfo.Kind = Asymmetric
keyInfo.PubKey = keyInfo.PrivKey.PublicKey // We'll simulate 'sending' a message to ourselves
}
err = EncodeWakuMessage(message, keyInfo)
require.NoError(t, err)
var decryptedPayload []byte
if symmetric {
decryptedPayload, err = decryptSymmetric(message.Payload, keyInfo.SymKey)
require.NoError(t, err)
} else {
decryptedPayload, err = decryptAsymmetric(message.Payload, keyInfo.PrivKey)
require.NoError(t, err)
}
decodedPayload, err := validateAndParse(decryptedPayload)
require.NoError(t, err)
require.Equal(t, data, decodedPayload.Data)
require.True(t, isMessageSigned(decryptedPayload[0]))
require.Len(t, decodedPayload.Signature, signatureLength)
require.Equal(t, keyInfo.PrivKey.PublicKey, *decodedPayload.PubKey)
}
func TestMessageEncryption(t *testing.T) {
var symmetric bool
for i := 0; i < 256; i++ {
singleMessageTest(t, symmetric)
symmetric = !symmetric
}
}
func TestEncryptWithZeroKey(t *testing.T) {
message := createTestMsg(1)
keyInfo := new(KeyInfo)
keyInfo.Kind = Symmetric
keyInfo.SymKey = make([]byte, aesKeyLength)
err := EncodeWakuMessage(message, keyInfo)
require.Error(t, err)
require.EqualError(t, err, "couldn't encrypt using symmetric key: invalid key provided for symmetric encryption, size: 32")
}
func singlePaddingTest(t *testing.T, padSize int) {
var err error
keyInfo := new(KeyInfo)
keyInfo.Kind = Symmetric
keyInfo.SymKey, err = generateSymKey()
require.NoError(t, err)
p := Payload{
Data: []byte{0, 1, 2},
Padding: make([]byte, padSize),
Key: keyInfo,
}
_, err = mrand.Read(p.Padding) // nolint: gosec
require.NoError(t, err)
encodedPayload, err := p.Encode(1)
require.NoError(t, err)
decodedData, err := decryptSymmetric(encodedPayload, keyInfo.SymKey)
require.NoError(t, err)
decodedPayload, err := validateAndParse(decodedData)
require.NoError(t, err)
require.Equal(t, p.Padding, decodedPayload.Padding)
}
func TestPadding(t *testing.T) {
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 // nolint: gosec
singlePaddingTest(t, n)
}
for i := 0; i < 256; i++ {
n := mrand.Intn(256*1024) + 256*256 // nolint: gosec
singlePaddingTest(t, n)
}
}
func TestPaddingAppendedToSymMessagesWithSignature(t *testing.T) {
pSrc, err := crypto.GenerateKey()
require.NoError(t, err)
p := Payload{
Data: make([]byte, 246),
Key: &KeyInfo{
Kind: Symmetric,
SymKey: make([]byte, aesKeyLength),
PrivKey: 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.
const payloadSizeFieldMinSize = 1
rawMessage := make([]byte, flagsLength+payloadSizeFieldMinSize+len(p.Data))
rawMessage, err = p.appendPadding(rawMessage)
require.NoError(t, err)
require.Equal(t, 512-signatureLength, len(rawMessage))
}
func TestAesNonce(t *testing.T) {
key := hexutil.MustDecode("0x03ca634cae0d49acb401d8a4c6b6fe8c55b70d115bf400769cc1400f3258cd31")
block, err := aes.NewCipher(key)
require.NoError(t, err)
aesgcm, err := cipher.NewGCM(block)
require.NoError(t, err)
require.Equal(t, aesgcm.NonceSize(), aesNonceLength)
}