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lnwallet: modify elkrem root derivation, derive from root HD seed

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This commit modifies the elkrem root derivation for each newly created
channel. First a master elkrem root is derived from the rood HD seed
generated from private wallet data. Next, a HKDF is used with the
secret being the master elkrem root.
This commit is contained in:
Olaoluwa Osuntokun
2016-08-12 15:43:16 -07:00
parent 564316a846
commit 99fdb3a3a9
2 changed files with 40 additions and 16 deletions
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9
lnwallet/script_utils.go
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@@ -743,12 +743,13 @@ func DeriveRevocationPrivKey(commitPrivKey *btcec.PrivateKey,
//
// [1]: https://eprint.iacr.org/2010/264.pdf
// [2]: https://tools.ietf.org/html/rfc5869
func deriveElkremRoot(localMultiSigKey *btcec.PrivateKey,
func deriveElkremRoot(elkremDerivationRoot *btcec.PrivateKey,
localMultiSigKey *btcec.PublicKey,
remoteMultiSigKey *btcec.PublicKey) wire.ShaHash {
secret := localMultiSigKey.Serialize()
salt := remoteMultiSigKey.SerializeCompressed()
info := []byte("elkrem")
secret := elkremDerivationRoot.Serialize()
salt := localMultiSigKey.SerializeCompressed()
info := remoteMultiSigKey.SerializeCompressed()
rootReader := hkdf.New(sha256.New, secret, salt, info)