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Merge pull request #8106 from orbitalturtle/sign-tagged-hash-rpc

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lnrpc: add tagged hash option to signer.SignMessage/VerifyMessage rpcs
This commit is contained in:
Olaoluwa Osuntokun 2023-11-06 17:05:35 -08:00 committed by GitHub
commit dacb86fdbc
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
10 changed files with 391 additions and 236 deletions
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4
docs/release-notes/release-notes-0.18.0.md
View File

@ -70,6 +70,9 @@
* [Deprecated](https://github.com/lightningnetwork/lnd/pull/7175)
`StatusUnknown` from the payment's rpc response in its status and replaced it
with `StatusInitiated` to explicitly report its current state.
* [Add an option to sign/verify a tagged
hash](https://github.com/lightningnetwork/lnd/pull/8106) to the
signer.SignMessage/signer.VerifyMessage RPCs.
## lncli Updates
## Code Health
@ -111,5 +114,6 @@
* Elle Mouton
* Keagan McClelland
* Matt Morehouse
* Turtle
* Ononiwu Maureen Chiamaka
* Yong Yu

70
itest/lnd_signer_test.go
View File

@ -2,11 +2,13 @@ package itest
import (
"bytes"
"context"
"crypto/sha256"
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/schnorr"
"github.com/btcsuite/btcd/btcutil"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
"github.com/lightningnetwork/lnd/keychain"
@ -458,4 +460,72 @@ func runSignVerifyMessage(ht *lntest.HarnessTest, alice *node.HarnessNode) {
}
verifyResp = alice.RPC.VerifyMessageSigner(verifyReq)
require.True(ht, verifyResp.Valid, "failed to verify message")
// Now let's try signing and verifying a tagged hash.
tag := []byte("lightninginvoice_requestsignature")
signMsgReq = &signrpc.SignMessageReq{
Msg: aliceMsg,
KeyLoc: keyLoc,
SchnorrSig: true,
Tag: tag,
}
signMsgResp = alice.RPC.SignMessageSigner(signMsgReq)
customPubKey = deriveCustomizedKey()
verifyReq = &signrpc.VerifyMessageReq{
Msg: aliceMsg,
Signature: signMsgResp.Signature,
Pubkey: schnorr.SerializePubKey(customPubKey),
IsSchnorrSig: true,
Tag: tag,
}
verifyResp = alice.RPC.VerifyMessageSigner(verifyReq)
require.True(ht, verifyResp.Valid, "failed to verify message")
// Verify that both SignMessage and VerifyMessage error if a tag is
// provided but the Schnorr option is not set.
signMsgReq = &signrpc.SignMessageReq{
Msg: aliceMsg,
KeyLoc: keyLoc,
Tag: tag,
}
expectedErr := "tag can only be used when the Schnorr signature " +
"option is set"
ctxt := context.Background()
_, err := alice.RPC.Signer.SignMessage(ctxt, signMsgReq)
require.ErrorContains(ht, err, expectedErr)
verifyReq = &signrpc.VerifyMessageReq{
Msg: aliceMsg,
Signature: signMsgResp.Signature,
Pubkey: schnorr.SerializePubKey(customPubKey),
Tag: tag,
}
_, err = alice.RPC.Signer.VerifyMessage(ctxt, verifyReq)
require.ErrorContains(ht, err, expectedErr)
// Make sure that SignMessage throws an error if a BIP0340 or
// TapSighash tag is provided.
signMsgReq = &signrpc.SignMessageReq{
Msg: aliceMsg,
KeyLoc: keyLoc,
SchnorrSig: true,
Tag: []byte("BIP0340/challenge"),
}
_, err = alice.RPC.Signer.SignMessage(ctxt, signMsgReq)
require.ErrorContains(ht, err, "tag cannot have BIP0340 prefix")
signMsgReq = &signrpc.SignMessageReq{
Msg: aliceMsg,
KeyLoc: keyLoc,
SchnorrSig: true,
Tag: chainhash.TagTapSighash,
}
_, err = alice.RPC.Signer.SignMessage(ctxt, signMsgReq)
require.ErrorContains(ht, err, "tag cannot be TapSighash")
}

13
keychain/btcwallet.go
View File

@ -458,8 +458,8 @@ func (b *BtcWalletKeyRing) SignMessageCompact(keyLoc KeyLocator,
//
// NOTE: This is part of the keychain.MessageSignerRing interface.
func (b *BtcWalletKeyRing) SignMessageSchnorr(keyLoc KeyLocator,
msg []byte, doubleHash bool, taprootTweak []byte) (*schnorr.Signature,
error) {
msg []byte, doubleHash bool, taprootTweak []byte,
tag []byte) (*schnorr.Signature, error) {
privKey, err := b.DerivePrivKey(KeyDescriptor{
KeyLocator: keyLoc,
@ -472,10 +472,15 @@ func (b *BtcWalletKeyRing) SignMessageSchnorr(keyLoc KeyLocator,
privKey = txscript.TweakTaprootPrivKey(*privKey, taprootTweak)
}
// If a tag was provided, we need to take the tagged hash of the input.
var digest []byte
if doubleHash {
switch {
case len(tag) > 0:
taggedHash := chainhash.TaggedHash(tag, msg)
digest = taggedHash[:]
case doubleHash:
digest = chainhash.DoubleHashB(msg)
} else {
default:
digest = chainhash.HashB(msg)
}
return schnorr.Sign(privKey, digest)

4
keychain/derivation.go
View File

@ -239,8 +239,8 @@ type MessageSignerRing interface {
// hashing it first, with the private key described in the key locator
// and the optional Taproot tweak applied to the private key.
SignMessageSchnorr(keyLoc KeyLocator, msg []byte,
doubleHash bool, taprootTweak []byte) (*schnorr.Signature,
error)
doubleHash bool, taprootTweak []byte,
tag []byte) (*schnorr.Signature, error)
}
// SingleKeyMessageSigner is an abstraction interface that hides the

466
lnrpc/signrpc/signer.pb.go
View File

@ -705,6 +705,9 @@ type SignMessageReq struct {
// a Schnorr signature. The private key is tweaked as described in BIP-341:
// privKey + h_tapTweak(internalKey || tapTweak)
SchnorrSigTapTweak []byte `protobuf:"bytes,6,opt,name=schnorr_sig_tap_tweak,json=schnorrSigTapTweak,proto3" json:"schnorr_sig_tap_tweak,omitempty"`
// An optional tag that can be provided when taking a tagged hash of a
// message. This option can only be used when schnorr_sig is true.
Tag []byte `protobuf:"bytes,7,opt,name=tag,proto3" json:"tag,omitempty"`
}
func (x *SignMessageReq) Reset() {
@ -781,6 +784,13 @@ func (x *SignMessageReq) GetSchnorrSigTapTweak() []byte {
return nil
}
func (x *SignMessageReq) GetTag() []byte {
if x != nil {
return x.Tag
}
return nil
}
type SignMessageResp struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@ -847,6 +857,9 @@ type VerifyMessageReq struct {
Pubkey []byte `protobuf:"bytes,3,opt,name=pubkey,proto3" json:"pubkey,omitempty"`
// Specifies if the signature is a Schnorr signature.
IsSchnorrSig bool `protobuf:"varint,4,opt,name=is_schnorr_sig,json=isSchnorrSig,proto3" json:"is_schnorr_sig,omitempty"`
// An optional tag that can be provided when taking a tagged hash of a
// message. This option can only be used when is_schnorr_sig is true.
Tag []byte `protobuf:"bytes,5,opt,name=tag,proto3" json:"tag,omitempty"`
}
func (x *VerifyMessageReq) Reset() {
@ -909,6 +922,13 @@ func (x *VerifyMessageReq) GetIsSchnorrSig() bool {
return false
}
func (x *VerifyMessageReq) GetTag() []byte {
if x != nil {
return x.Tag
}
return nil
}
type VerifyMessageResp struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@ -2065,7 +2085,7 @@ var file_signrpc_signer_proto_rawDesc = []byte{
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@ -2080,228 +2100,230 @@ var file_signrpc_signer_proto_rawDesc = []byte{
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}
var (

12
lnrpc/signrpc/signer.proto
View File

@ -349,6 +349,12 @@ message SignMessageReq {
privKey + h_tapTweak(internalKey || tapTweak)
*/
bytes schnorr_sig_tap_tweak = 6;
/*
An optional tag that can be provided when taking a tagged hash of a
message. This option can only be used when schnorr_sig is true.
*/
bytes tag = 7;
}
message SignMessageResp {
/*
@ -380,6 +386,12 @@ message VerifyMessageReq {
Specifies if the signature is a Schnorr signature.
*/
bool is_schnorr_sig = 4;
/*
An optional tag that can be provided when taking a tagged hash of a
message. This option can only be used when is_schnorr_sig is true.
*/
bytes tag = 5;
}
message VerifyMessageResp {

10
lnrpc/signrpc/signer.swagger.json
View File

@ -820,6 +820,11 @@
"type": "string",
"format": "byte",
"title": "The optional Taproot tweak bytes to apply to the private key before creating\na Schnorr signature. The private key is tweaked as described in BIP-341:\nprivKey + h_tapTweak(internalKey || tapTweak)"
},
"tag": {
"type": "string",
"format": "byte",
"description": "An optional tag that can be provided when taking a tagged hash of a\nmessage. This option can only be used when schnorr_sig is true."
}
}
},
@ -945,6 +950,11 @@
"is_schnorr_sig": {
"type": "boolean",
"description": "Specifies if the signature is a Schnorr signature."
},
"tag": {
"type": "string",
"format": "byte",
"description": "An optional tag that can be provided when taking a tagged hash of a\nmessage. This option can only be used when is_schnorr_sig is true."
}
}
},

31
lnrpc/signrpc/signer_server.go
View File

@ -34,6 +34,9 @@ const (
// SubServerConfigDispatcher instance recognize this as the name of the
// config file that we need.
subServerName = "SignRPC"
// BIP0340 is the prefix for BIP0340-related tagged hashes.
BIP0340 = "BIP0340"
)
var (
@ -605,6 +608,20 @@ func (s *Server) SignMessage(_ context.Context,
return nil, fmt.Errorf("compact format can not be used for " +
"Schnorr signatures")
}
if !in.SchnorrSig && len(in.Tag) > 0 {
return nil, fmt.Errorf("tag can only be used when the " +
"Schnorr signature option is set")
}
if bytes.HasPrefix(in.Tag, []byte(BIP0340)) {
return nil, fmt.Errorf("tag cannot have BIP0340 prefix")
}
if bytes.HasPrefix(in.Tag, chainhash.TagTapSighash) {
return nil, fmt.Errorf("tag cannot be TapSighash")
}
if in.DoubleHash && len(in.Tag) > 0 {
return nil, fmt.Errorf("double hash and tag can't be set at " +
"the same time")
}
// Describe the private key we'll be using for signing.
keyLocator := keychain.KeyLocator{
@ -616,7 +633,7 @@ func (s *Server) SignMessage(_ context.Context,
if in.SchnorrSig {
sig, err := s.cfg.KeyRing.SignMessageSchnorr(
keyLocator, in.Msg, in.DoubleHash,
in.SchnorrSigTapTweak,
in.SchnorrSigTapTweak, in.Tag,
)
if err != nil {
return nil, fmt.Errorf("can't sign the hash: %v", err)
@ -682,6 +699,10 @@ func (s *Server) VerifyMessage(_ context.Context,
if in.Pubkey == nil {
return nil, fmt.Errorf("a pubkey to verify MUST be passed in")
}
if !in.IsSchnorrSig && len(in.Tag) > 0 {
return nil, fmt.Errorf("tag can only be used when the " +
"Schnorr signature option is set")
}
// We allow for Schnorr signatures to be verified.
if in.IsSchnorrSig {
@ -699,7 +720,13 @@ func (s *Server) VerifyMessage(_ context.Context,
"signature: %v", err)
}
digest := chainhash.HashB(in.Msg)
var digest []byte
if len(in.Tag) == 0 {
digest = chainhash.HashB(in.Msg)
} else {
taggedHash := chainhash.TaggedHash(in.Tag, in.Msg)
digest = taggedHash[:]
}
valid := sigParsed.Verify(digest, pubkey)
return &VerifyMessageResp{

12
lntest/mock/secretkeyring.go
View File

@ -74,13 +74,17 @@ func (s *SecretKeyRing) SignMessageCompact(_ keychain.KeyLocator,
// SignMessageSchnorr signs the passed message and ignores the KeyDescriptor.
func (s *SecretKeyRing) SignMessageSchnorr(_ keychain.KeyLocator,
msg []byte, doubleHash bool, taprootTweak []byte) (*schnorr.Signature,
error) {
msg []byte, doubleHash bool, taprootTweak []byte,
tag []byte) (*schnorr.Signature, error) {
var digest []byte
if doubleHash {
switch {
case len(tag) > 0:
taggedHash := chainhash.TaggedHash(tag, msg)
digest = taggedHash[:]
case doubleHash:
digest = chainhash.DoubleHashB(msg)
} else {
default:
digest = chainhash.HashB(msg)
}

5
lnwallet/rpcwallet/rpcwallet.go
View File

@ -513,8 +513,8 @@ func (r *RPCKeyRing) SignMessageCompact(keyLoc keychain.KeyLocator,
//
// NOTE: This method is part of the keychain.MessageSignerRing interface.
func (r *RPCKeyRing) SignMessageSchnorr(keyLoc keychain.KeyLocator,
msg []byte, doubleHash bool, taprootTweak []byte) (*schnorr.Signature,
error) {
msg []byte, doubleHash bool, taprootTweak []byte,
tag []byte) (*schnorr.Signature, error) {
ctxt, cancel := context.WithTimeout(context.Background(), r.rpcTimeout)
defer cancel()
@ -528,6 +528,7 @@ func (r *RPCKeyRing) SignMessageSchnorr(keyLoc keychain.KeyLocator,
DoubleHash: doubleHash,
SchnorrSig: true,
SchnorrSigTapTweak: taprootTweak,
Tag: tag,
})
if err != nil {
considerShutdown(err)