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Merge pull request #9220 from oren-z0/issue-9169-code-comments-fix

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Fix comments regarding breach hint and key calculations
This commit is contained in:
Oliver Gugger 2024-10-25 11:14:22 +02:00 • committed by GitHub
commit acbb33bb7b
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3 changed files with 4 additions and 3 deletions
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2
watchtower/lookout/lookout.go
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@ -203,7 +203,7 @@ func (l *Lookout) processEpoch(epoch *chainntnfs.BlockEpoch,
// The decryption key for the state update should be the full
// txid of the breaching commitment transaction.
// The decryption key for the state update should be computed as
// key = SHA256(txid).
// key = SHA256(txid || txid).
breachTxID := commitTx.TxHash()
breachKey := blob.NewBreachKeyFromHash(&breachTxID)

3
watchtower/wtclient/backup_task.go
View file

@ -339,7 +339,8 @@ func (t *backupTask) craftSessionPayload(
breachTxID := t.breachInfo.BreachTxHash
// Compute the breach key as SHA256(txid).
// Compute the breach hint as SHA256(txid)[:16] and breach key as
// SHA256(txid || txid).
hint, key := blob.NewBreachHintAndKeyFromHash(&breachTxID)
// Then, we'll encrypt the computed justice kit using the full breach

2
watchtower/wtclient/backup_task_internal_test.go
View file

@ -652,7 +652,7 @@ func testBackupTask(t *testing.T, test backupTaskTest) {
hint, encBlob, err := task.craftSessionPayload(test.signer)
require.NoError(t, err, "unable to craft session payload")
// Verify that the breach hint matches the breach txid's prefix.
// Verify that the breach hint matches the prefix of SHA256(txid).
breachTxID := test.breachInfo.BreachTxHash
expHint := blob.NewBreachHintFromHash(&breachTxID)
require.Equal(t, expHint, hint)