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78 lines
2.4 KiB
Go
78 lines
2.4 KiB
Go
package netann
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import (
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"fmt"
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"github.com/btcsuite/btcd/btcec"
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/lightningnetwork/lnd/input"
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"github.com/lightningnetwork/lnd/keychain"
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"github.com/lightningnetwork/lnd/lnwallet"
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)
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// NodeSigner is an implementation of the MessageSigner interface backed by the
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// identity private key of running lnd node.
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type NodeSigner struct {
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keySigner keychain.SingleKeyDigestSigner
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}
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// NewNodeSigner creates a new instance of the NodeSigner backed by the target
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// private key.
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func NewNodeSigner(keySigner keychain.SingleKeyDigestSigner) *NodeSigner {
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return &NodeSigner{
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keySigner: keySigner,
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}
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}
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// SignMessage signs a double-sha256 digest of the passed msg under the
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// resident node's private key. If the target public key is _not_ the node's
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// private key, then an error will be returned.
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func (n *NodeSigner) SignMessage(pubKey *btcec.PublicKey,
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msg []byte) (input.Signature, error) {
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// If this isn't our identity public key, then we'll exit early with an
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// error as we can't sign with this key.
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if !pubKey.IsEqual(n.keySigner.PubKey()) {
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return nil, fmt.Errorf("unknown public key")
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}
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// Otherwise, we'll sign the dsha256 of the target message.
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var digest [32]byte
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copy(digest[:], chainhash.DoubleHashB(msg))
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sig, err := n.keySigner.SignDigest(digest)
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if err != nil {
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return nil, fmt.Errorf("can't sign the message: %v", err)
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}
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return sig, nil
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}
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// SignCompact signs a double-sha256 digest of the msg parameter under the
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// resident node's private key. The returned signature is a pubkey-recoverable
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// signature.
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func (n *NodeSigner) SignCompact(msg []byte) ([]byte, error) {
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// We'll sign the dsha256 of the target message.
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digest := chainhash.DoubleHashB(msg)
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return n.SignDigestCompact(digest)
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}
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// SignDigestCompact signs the provided message digest under the resident
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// node's private key. The returned signature is a pubkey-recoverable signature.
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func (n *NodeSigner) SignDigestCompact(hash []byte) ([]byte, error) {
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var digest [32]byte
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copy(digest[:], hash)
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// keychain.SignDigestCompact returns a pubkey-recoverable signature.
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sig, err := n.keySigner.SignDigestCompact(digest)
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if err != nil {
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return nil, fmt.Errorf("can't sign the hash: %v", err)
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}
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return sig, nil
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}
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// A compile time check to ensure that NodeSigner implements the MessageSigner
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// interface.
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var _ lnwallet.MessageSigner = (*NodeSigner)(nil)
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