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This commit adds the signmessage command which allows a user to sign a message with the nodes identity key, similiar to `lncli signmessage`.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| package main | ||
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| import ( | ||
| "fmt" | ||
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| chantools_lnd "github.com/lightninglabs/chantools/lnd" | ||
| "github.com/lightningnetwork/lnd/keychain" | ||
| "github.com/spf13/cobra" | ||
| "github.com/tv42/zbase32" | ||
| ) | ||
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| var ( | ||
| signedMsgPrefix = []byte("Lightning Signed Message:") | ||
| ) | ||
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| type signMessageCommand struct { | ||
| Msg string | ||
| SingleHash bool | ||
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| rootKey *rootKey | ||
| cmd *cobra.Command | ||
| } | ||
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| func newSignMessageCommand() *cobra.Command { | ||
| cc := &signMessageCommand{} | ||
| cc.cmd = &cobra.Command{ | ||
| Use: "signmessage", | ||
| Short: "Sign a message with the node's private key.", | ||
| Long: `Sign msg with the resident node's private key. | ||
| Returns the signature as a zbase32 string.`, | ||
| Example: `chantools dumpbackup \ | ||
| --multi_file ~/.lnd/data/chain/bitcoin/mainnet/channel.backup`, | ||
| RunE: cc.Execute, | ||
| } | ||
| cc.cmd.Flags().StringVar( | ||
| &cc.Msg, "msg", "", "the message to sign", | ||
| ) | ||
| cc.cmd.Flags().BoolVar( | ||
| &cc.SingleHash, "single_hash", false, "single hash the msg "+ | ||
| "instead of double hash (lnd default is false)", | ||
| ) | ||
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| cc.rootKey = newRootKey(cc.cmd, "decrypting the backup") | ||
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| return cc.cmd | ||
| } | ||
| func (c *signMessageCommand) Execute(_ *cobra.Command, _ []string) error { | ||
| if c.Msg == "" { | ||
| return fmt.Errorf("please enter a valid msg") | ||
| } | ||
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| extendedKey, err := c.rootKey.read() | ||
| if err != nil { | ||
| return fmt.Errorf("error reading root key: %w", err) | ||
| } | ||
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| signer := &chantools_lnd.Signer{ | ||
| ExtendedKey: extendedKey, | ||
| ChainParams: chainParams, | ||
| } | ||
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| // Create the key locator for the node key. | ||
| keyLocator := keychain.KeyLocator{ | ||
| Family: keychain.KeyFamilyNodeKey, | ||
| Index: 0, | ||
| } | ||
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| // Fetch the private key for node key. | ||
| privKey, err := signer.FetchPrivKey(&keychain.KeyDescriptor{ | ||
| KeyLocator: keyLocator, | ||
| }) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| // Create a new signer. | ||
| privKeyMsgSigner := keychain.NewPrivKeyMessageSigner( | ||
| privKey, keyLocator, | ||
| ) | ||
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| // Prepend the special lnd prefix. | ||
| // See: https://github.com/lightningnetwork/lnd/blob/63e698ec4990e678089533561fd95cfd684b67db/rpcserver.go#L1576 . | ||
| msg := append(signedMsgPrefix, []byte(c.Msg)...) | ||
| sigBytes, err := privKeyMsgSigner.SignMessageCompact(msg, !c.SingleHash) | ||
| if err != nil { | ||
| return err | ||
| } | ||
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| // Encode the signature. | ||
| sig := zbase32.EncodeToString(sigBytes) | ||
| fmt.Println(sig) | ||
|
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| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,26 @@ | ||
| ## chantools signmessage | ||
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| Signs a message with the nodes key, results in the same signature as | ||
| `lncli signmessage` | ||
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| ### Synopsis | ||
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| ``` | ||
| chantools signmessage [flags] | ||
| ``` | ||
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| ### Examples | ||
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| ``` | ||
| chantools signmessage --msg=foobar | ||
| ``` | ||
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| ### Options | ||
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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 | ||
| -h, --help help for signmessage | ||
| --msg string the message to sign | ||
| --rootkey string BIP32 HD root key of the wallet to use for decrypting the backup; leave empty to prompt for lnd 24 word aezeed | ||
| --single_hash single hash the msg instead of double hash (lnd default is false) | ||
| ``` |
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