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77 lines
2.5 KiB
77 lines
2.5 KiB
// +build rpctest |
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package lnwallet |
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import ( |
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"github.com/btcsuite/btcd/chaincfg/chainhash" |
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"github.com/lightningnetwork/lnd/keychain" |
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"github.com/lightningnetwork/lnd/shachain" |
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) |
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// nextRevocationProducer creates a new revocation producer, deriving the |
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// revocation root by applying ECDH to a new key from our revocation root family |
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// and the multisig key we use for the channel. |
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func (l *LightningWallet) nextRevocationProducer(res *ChannelReservation, |
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keyRing keychain.KeyRing) (shachain.Producer, error) { |
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// Derive the next key in the revocation root family. |
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nextRevocationKeyDesc, err := keyRing.DeriveNextKey( |
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keychain.KeyFamilyRevocationRoot, |
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) |
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if err != nil { |
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return nil, err |
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} |
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// Within our itests, we want to make sure we can still restore channel |
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// backups created with the old revocation root derivation method. To |
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// create a channel in the legacy format during the test, we signal this |
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// by setting an explicit pending channel ID. The ID is the hex |
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// representation of the string "legacy-revocation". |
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itestLegacyFormatChanID := [32]byte{ |
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0x6c, 0x65, 0x67, 0x61, 0x63, 0x79, 0x2d, 0x72, 0x65, 0x76, |
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0x6f, 0x63, 0x61, 0x74, 0x69, 0x6f, 0x6e, |
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} |
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if res.pendingChanID == itestLegacyFormatChanID { |
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revocationRoot, err := l.DerivePrivKey(nextRevocationKeyDesc) |
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if err != nil { |
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return nil, err |
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} |
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// Once we have the root, we can then generate our shachain |
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// producer and from that generate the per-commitment point. |
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revRoot, err := chainhash.NewHash(revocationRoot.Serialize()) |
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if err != nil { |
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return nil, err |
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} |
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return shachain.NewRevocationProducer(*revRoot), nil |
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} |
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// If the DeriveNextKey call returns the first key with Index 0, we need |
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// to re-derive the key as the keychain/btcwallet.go DerivePrivKey call |
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// special-cases Index 0. |
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if nextRevocationKeyDesc.Index == 0 { |
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nextRevocationKeyDesc, err = keyRing.DeriveNextKey( |
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keychain.KeyFamilyRevocationRoot, |
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) |
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if err != nil { |
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return nil, err |
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} |
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} |
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res.nextRevocationKeyLoc = nextRevocationKeyDesc.KeyLocator |
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// Perform an ECDH operation between the private key described in |
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// nextRevocationKeyDesc and our public multisig key. The result will be |
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// used to seed the revocation producer. |
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revRoot, err := l.ECDH( |
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nextRevocationKeyDesc, res.ourContribution.MultiSigKey.PubKey, |
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) |
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if err != nil { |
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return nil, err |
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} |
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// Once we have the root, we can then generate our shachain producer |
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// and from that generate the per-commitment point. |
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return shachain.NewRevocationProducer(revRoot), nil |
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}
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