lnd.xprv/watchtower/blob/justice_kit_test.go

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package blob_test
import (
"crypto/rand"
"encoding/binary"
"io"
"reflect"
"testing"
"github.com/lightningnetwork/lnd/lnwire"
"github.com/lightningnetwork/lnd/watchtower/blob"
)
func makePubKey(i uint64) blob.PubKey {
var pk blob.PubKey
pk[0] = 0x02
if i%2 == 1 {
pk[0] |= 0x01
}
binary.BigEndian.PutUint64(pk[1:9], i)
return pk
}
func makeSig(i int) lnwire.Sig {
var sig lnwire.Sig
binary.BigEndian.PutUint64(sig[:8], uint64(i))
return sig
}
var descriptorTests = []struct {
name string
encVersion uint16
decVersion uint16
revPubKey blob.PubKey
delayPubKey blob.PubKey
csvDelay uint32
commitToLocalSig lnwire.Sig
hasCommitToRemote bool
commitToRemotePubKey blob.PubKey
commitToRemoteSig lnwire.Sig
encErr error
decErr error
}{
{
name: "to-local only",
encVersion: 0,
decVersion: 0,
revPubKey: makePubKey(0),
delayPubKey: makePubKey(1),
csvDelay: 144,
commitToLocalSig: makeSig(1),
},
{
name: "to-local and p2wkh",
encVersion: 0,
decVersion: 0,
revPubKey: makePubKey(0),
delayPubKey: makePubKey(1),
csvDelay: 144,
commitToLocalSig: makeSig(1),
hasCommitToRemote: true,
commitToRemotePubKey: makePubKey(2),
commitToRemoteSig: makeSig(2),
},
{
name: "unknown encrypt version",
encVersion: 1,
decVersion: 0,
revPubKey: makePubKey(0),
delayPubKey: makePubKey(1),
csvDelay: 144,
commitToLocalSig: makeSig(1),
encErr: blob.ErrUnknownBlobVersion,
},
{
name: "unknown decrypt version",
encVersion: 0,
decVersion: 1,
revPubKey: makePubKey(0),
delayPubKey: makePubKey(1),
csvDelay: 144,
commitToLocalSig: makeSig(1),
decErr: blob.ErrUnknownBlobVersion,
},
}
// TestBlobJusticeKitEncryptDecrypt asserts that encrypting and decrypting a
// plaintext blob produces the original. The tests include negative assertions
// when passed invalid combinations, and that all successfully encrypted blobs
// are of constant size.
func TestBlobJusticeKitEncryptDecrypt(t *testing.T) {
for i, test := range descriptorTests {
boj := &blob.JusticeKit{
RevocationPubKey: test.revPubKey,
LocalDelayPubKey: test.delayPubKey,
CSVDelay: test.csvDelay,
CommitToLocalSig: test.commitToLocalSig,
CommitToRemotePubKey: test.commitToRemotePubKey,
CommitToRemoteSig: test.commitToRemoteSig,
}
// Generate a random encryption key for the blob. The key is
// sized at 32 byte, as in practice we will be using the remote
// party's commitment txid as the key.
key := make([]byte, blob.KeySize)
_, err := io.ReadFull(rand.Reader, key)
if err != nil {
t.Fatalf("test #%d %s -- unable to generate blob "+
"encryption key: %v", i, test.name, err)
}
nonce := make([]byte, blob.NonceSize)
_, err = io.ReadFull(rand.Reader, nonce)
if err != nil {
t.Fatalf("test #%d %s -- unable to generate nonce "+
"nonce: %v", i, test.name, err)
}
// Encrypt the blob plaintext using the generated key and
// target version for this test.
ctxt, err := boj.Encrypt(nonce, key, test.encVersion)
if err != test.encErr {
t.Fatalf("test #%d %s -- unable to encrypt blob: %v",
i, test.name, err)
} else if test.encErr != nil {
// If the test expected an encryption failure, we can
// continue to the next test.
continue
}
// Ensure that all encrypted blobs are padded out to the same
// size: 282 bytes for version 0.
if len(ctxt) != blob.Size(test.encVersion) {
t.Fatalf("test #%d %s -- expected blob to have "+
"size %d, got %d instead", i, test.name,
blob.Size(test.encVersion), len(ctxt))
}
// Decrypt the encrypted blob, reconstructing the original
// blob plaintext from the decrypted contents. We use the target
// decryption version specified by this test case.
boj2, err := blob.Decrypt(nonce, key, ctxt, test.decVersion)
if err != test.decErr {
t.Fatalf("test #%d %s -- unable to decrypt blob: %v",
i, test.name, err)
} else if test.decErr != nil {
// If the test expected an decryption failure, we can
// continue to the next test.
continue
}
// Check that the decrypted blob properly reports whether it has
// a to-remote output or not.
if boj2.HasCommitToRemoteOutput() != test.hasCommitToRemote {
t.Fatalf("test #%d %s -- expected blob has_to_remote "+
"to be %v, got %v", i, test.name,
test.hasCommitToRemote,
boj2.HasCommitToRemoteOutput())
}
// Check that the original blob plaintext matches the
// one reconstructed from the encrypted blob.
if !reflect.DeepEqual(boj, boj2) {
t.Fatalf("test #%d %s -- decrypted plaintext does not "+
"match original, want: %v, got %v",
i, test.name, boj, boj2)
}
}
}