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watchtower/wtdb/breach_hint: redefine breach hint as sha(txid)

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This commit is contained in:
Conner Fromknecht 2019-06-13 17:26:46 -07:00
parent 1b89ba1782
commit d9cfa610dc
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1 changed files with 8 additions and 4 deletions
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12
watchtower/blob/derivation.go
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@ -1,23 +1,27 @@
package blob
import (
"crypto/sha256"
"encoding/hex"
"github.com/btcsuite/btcd/chaincfg/chainhash"
)
// BreachHintSize is the length of the txid prefix used to identify remote
// BreachHintSize is the length of the identifier used to detect remote
// commitment broadcasts.
const BreachHintSize = 16
// BreachHint is the first 16-bytes of the txid belonging to a revoked
// commitment transaction.
// BreachHint is the first 16-bytes of SHA256(txid), which is used to identify
// the breach transaction.
type BreachHint [BreachHintSize]byte
// NewBreachHintFromHash creates a breach hint from a transaction ID.
func NewBreachHintFromHash(hash *chainhash.Hash) BreachHint {
h := sha256.New()
h.Write(hash[:])
var hint BreachHint
copy(hint[:], hash[:BreachHintSize])
copy(hint[:], h.Sum(nil))
return hint
}