mirror of https://github.com/guggero/chantools
signmessage: add signmessage cmd
This commit adds the signmessage command which allows a user to sign a message with the nodes identity key, similiar to `lncli signmessage`.pull/121/head
sputn1ck
3 months ago
parent
cf4cabbd2a
commit
3fbf8d0bd2
@ -0,0 +1,90 @@
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package main
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import (
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"fmt"
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chantools_lnd "github.com/lightninglabs/chantools/lnd"
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"github.com/lightningnetwork/lnd/keychain"
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"github.com/spf13/cobra"
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"github.com/tv42/zbase32"
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)
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var (
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signedMsgPrefix = []byte("Lightning Signed Message:")
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)
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type signMessageCommand struct {
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Msg string
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rootKey *rootKey
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cmd *cobra.Command
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}
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func newSignMessageCommand() *cobra.Command {
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cc := &signMessageCommand{}
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cc.cmd = &cobra.Command{
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Use: "signmessage",
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Short: "Sign a message with the node's private key.",
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Long: `Sign msg with the resident node's private key.
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Returns the signature as a zbase32 string.`,
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Example: `chantools signmessage --msg=foobar`,
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RunE: cc.Execute,
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}
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cc.cmd.Flags().StringVar(
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&cc.Msg, "msg", "", "the message to sign",
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)
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cc.rootKey = newRootKey(cc.cmd, "decrypting the backup")
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return cc.cmd
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}
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func (c *signMessageCommand) Execute(_ *cobra.Command, _ []string) error {
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if c.Msg == "" {
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return fmt.Errorf("please enter a valid msg")
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}
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extendedKey, err := c.rootKey.read()
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if err != nil {
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return fmt.Errorf("error reading root key: %w", err)
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}
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signer := &chantools_lnd.Signer{
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ExtendedKey: extendedKey,
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ChainParams: chainParams,
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}
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// Create the key locator for the node key.
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keyLocator := keychain.KeyLocator{
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Family: keychain.KeyFamilyNodeKey,
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Index: 0,
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}
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// Fetch the private key for node key.
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privKey, err := signer.FetchPrivKey(&keychain.KeyDescriptor{
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KeyLocator: keyLocator,
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})
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if err != nil {
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return err
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}
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// Create a new signer.
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privKeyMsgSigner := keychain.NewPrivKeyMessageSigner(
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privKey, keyLocator,
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)
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// Prepend the special lnd prefix.
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// See: https://github.com/lightningnetwork/lnd/blob/63e698ec4990e678089533561fd95cfd684b67db/rpcserver.go#L1576 .
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msg := []byte(c.Msg)
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msg = append(signedMsgPrefix, msg...)
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sigBytes, err := privKeyMsgSigner.SignMessageCompact(msg, true)
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if err != nil {
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return err
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}
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// Encode the signature.
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sig := zbase32.EncodeToString(sigBytes)
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fmt.Println(sig)
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return nil
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}
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@ -0,0 +1,26 @@
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## chantools signmessage
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Signs a message with the nodes key, results in the same signature as
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`lncli signmessage`
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### Synopsis
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```
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chantools signmessage [flags]
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```
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### Examples
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```
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chantools signmessage --msg=foobar
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```
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### Options
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```
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--bip39 read a classic BIP39 seed and passphrase from the terminal instead of asking for lnd seed format or providing the --rootkey flag
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-h, --help help for signmessage
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--msg string the message to sign
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--rootkey string BIP32 HD root key of the wallet to use for decrypting the backup; leave empty to prompt for lnd 24 word aezeed
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--single_hash single hash the msg instead of double hash (lnd default is false)
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```
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