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51 lines
1.5 KiB
51 lines
1.5 KiB
// +build !rpctest |
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package lnwallet |
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import ( |
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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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// 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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