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watchtower/multi: use new blob.BreachKey for enc/dec of justice kits

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This commit is contained in:
Conner Fromknecht
2019-06-13 17:27:17 -07:00
parent 59bf4857f4
commit 3b51906a78
6 changed files with 27 additions and 37 deletions
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7
watchtower/lookout/lookout.go
View File

@@ -202,13 +202,16 @@ func (l *Lookout) processEpoch(epoch *chainntnfs.BlockEpoch,
// The decryption key for the state update should be the full
// txid of the breaching commitment transaction.
commitTxID := commitTx.TxHash()
// The decryption key for the state update should be computed as
// key = SHA256(txid).
breachTxID := commitTx.TxHash()
breachKey := blob.NewBreachKeyFromHash(&breachTxID)
// Now, decrypt the blob of justice that we received in the
// state update. This will contain all information required to
// sweep the breached commitment outputs.
justiceKit, err := blob.Decrypt(
commitTxID[:], match.EncryptedBlob,
breachKey, match.EncryptedBlob,
match.SessionInfo.Policy.BlobType,
)
if err != nil {

11
watchtower/lookout/lookout_test.go
View File

@@ -148,14 +148,17 @@ func TestLookoutBreachMatching(t *testing.T) {
CommitToLocalSig: makeArray64(2),
}
// Encrypt the first justice kit under the txid of the first txn.
encBlob1, err := blob1.Encrypt(hash1[:], blob.FlagCommitOutputs.Type())
key1 := blob.NewBreachKeyFromHash(&hash1)
key2 := blob.NewBreachKeyFromHash(&hash2)
// Encrypt the first justice kit under breach key one.
encBlob1, err := blob1.Encrypt(key1, blob.FlagCommitOutputs.Type())
if err != nil {
t.Fatalf("unable to encrypt sweep detail 1: %v", err)
}
// Encrypt the second justice kit under the txid of the second txn.
encBlob2, err := blob2.Encrypt(hash2[:], blob.FlagCommitOutputs.Type())
// Encrypt the second justice kit under breach key two.
encBlob2, err := blob2.Encrypt(key2, blob.FlagCommitOutputs.Type())
if err != nil {
t.Fatalf("unable to encrypt sweep detail 2: %v", err)
}