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Merge pull request #7994 from Roasbeef/remote-signer-musig2-nonces

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multi: add ability to specify local nonces for musig2 signer rpc, add itest for remote signer taproot chans
This commit is contained in:
Olaoluwa Osuntokun 2023-09-18 13:54:14 -07:00 committed by GitHub
commit 7412482406
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
13 changed files with 301 additions and 161 deletions
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7
docs/release-notes/release-notes-0.17.0.md
View File

@ -254,6 +254,13 @@ None
* Add [`--unused`](https://github.com/lightningnetwork/lnd/pull/6387) to
`lncli newaddr` command.
* [The `MuSig2SessionRequest` proto message now contains a field to allow a
caller to specify a custom signing
nonce](https://github.com/lightningnetwork/lnd/pull/7994). This can be useful
for protocol where an external nonces must be pre-generated before the full
session can be completed.
## Code Health
* Updated [our fork for serializing protobuf as JSON to be based on the
latest version of `google.golang.org/protobuf` instead of the deprecated

26
input/musig2.go
View File

@ -49,12 +49,13 @@ type MuSig2Signer interface {
// already known, they can be submitted as well to reduce the number of
// method calls necessary later on.
//
// The set of sessionOpts are _optional_ and allow a caller to modify
// the generated sessions. As an example the local nonce might already
// be generated ahead of time.
// The localNonces field is optional. If it is set, then the specified
// nonces will be used instead of generating from scratch. This is
// useful in instances where the nonces are generated ahead of time
// before the set of signers is known.
MuSig2CreateSession(MuSig2Version, keychain.KeyLocator,
[]*btcec.PublicKey, *MuSig2Tweaks, [][musig2.PubNonceSize]byte,
...musig2.SessionOption) (*MuSig2SessionInfo, error)
*musig2.Nonces) (*MuSig2SessionInfo, error)
// MuSig2RegisterNonces registers one or more public nonces of other
// signing participants for a session identified by its ID. This method
@ -379,18 +380,18 @@ func combineKeysV040(allSignerPubKeys []*btcec.PublicKey, sortKeys bool,
// MuSig2CreateContext creates a new MuSig2 signing context.
func MuSig2CreateContext(bipVersion MuSig2Version, privKey *btcec.PrivateKey,
allSignerPubKeys []*btcec.PublicKey, tweaks *MuSig2Tweaks,
sessionOpts ...musig2.SessionOption,
localNonces *musig2.Nonces,
) (MuSig2Context, MuSig2Session, error) {
switch bipVersion {
case MuSig2Version040:
return createContextV040(
privKey, allSignerPubKeys, tweaks, sessionOpts...,
privKey, allSignerPubKeys, tweaks, localNonces,
)
case MuSig2Version100RC2:
return createContextV100RC2(
privKey, allSignerPubKeys, tweaks, sessionOpts...,
privKey, allSignerPubKeys, tweaks, localNonces,
)
default:
@ -403,7 +404,7 @@ func MuSig2CreateContext(bipVersion MuSig2Version, privKey *btcec.PrivateKey,
// BIP draft version 1.0.0rc2.
func createContextV100RC2(privKey *btcec.PrivateKey,
allSignerPubKeys []*btcec.PublicKey, tweaks *MuSig2Tweaks,
sessionOpts ...musig2.SessionOption,
localNonces *musig2.Nonces,
) (*musig2.Context, *musig2.Session, error) {
// The context keeps track of all signing keys and our local key.
@ -419,6 +420,13 @@ func createContextV100RC2(privKey *btcec.PrivateKey,
"context: %v", err)
}
var sessionOpts []musig2.SessionOption
if localNonces != nil {
sessionOpts = append(
sessionOpts, musig2.WithPreGeneratedNonce(localNonces),
)
}
muSigSession, err := muSigContext.NewSession(sessionOpts...)
if err != nil {
return nil, nil, fmt.Errorf("error creating MuSig2 signing "+
@ -432,7 +440,7 @@ func createContextV100RC2(privKey *btcec.PrivateKey,
// draft version 0.4.0.
func createContextV040(privKey *btcec.PrivateKey,
allSignerPubKeys []*btcec.PublicKey, tweaks *MuSig2Tweaks,
_ ...musig2.SessionOption,
_ *musig2.Nonces,
) (*musig2v040.Context, *musig2v040.Session, error) {
// The context keeps track of all signing keys and our local key.

4
input/musig2_session_manager.go
View File

@ -63,7 +63,7 @@ func NewMusigSessionManager(keyFetcher PrivKeyFetcher) *MusigSessionManager {
func (m *MusigSessionManager) MuSig2CreateSession(bipVersion MuSig2Version,
keyLoc keychain.KeyLocator, allSignerPubKeys []*btcec.PublicKey,
tweaks *MuSig2Tweaks, otherSignerNonces [][musig2.PubNonceSize]byte,
sessionOpts ...musig2.SessionOption) (*MuSig2SessionInfo, error) {
localNonces *musig2.Nonces) (*MuSig2SessionInfo, error) {
// We need to derive the private key for signing. In the remote signing
// setup, this whole RPC call will be forwarded to the signing
@ -78,7 +78,7 @@ func (m *MusigSessionManager) MuSig2CreateSession(bipVersion MuSig2Version,
// Create a signing context and session with the given private key and
// list of all known signer public keys.
musigContext, musigSession, err := MuSig2CreateContext(
bipVersion, privKey, allSignerPubKeys, tweaks, sessionOpts...,
bipVersion, privKey, allSignerPubKeys, tweaks, localNonces,
)
if err != nil {
return nil, fmt.Errorf("error creating signing context: %w",

23
itest/lnd_payment_test.go
View File

@ -233,19 +233,34 @@ func testAsyncPayments(ht *lntest.HarnessTest) {
ht.EnsureConnected(alice, bob)
ht.FundCoins(btcutil.SatoshiPerBitcoin, alice)
runAsyncPayments(ht, alice, bob)
runAsyncPayments(ht, alice, bob, nil)
}
// runAsyncPayments tests the performance of the async payments.
func runAsyncPayments(ht *lntest.HarnessTest, alice, bob *node.HarnessNode) {
func runAsyncPayments(ht *lntest.HarnessTest, alice, bob *node.HarnessNode,
commitType *lnrpc.CommitmentType) {
const paymentAmt = 100
channelCapacity := btcutil.Amount(paymentAmt * 2000)
chanArgs := lntest.OpenChannelParams{
Amt: channelCapacity,
}
if commitType != nil {
chanArgs.CommitmentType = *commitType
if *commitType == lnrpc.CommitmentType_SIMPLE_TAPROOT {
chanArgs.Private = true
}
}
// First establish a channel with a capacity equals to the overall
// amount of payments, between Alice and Bob, at the end of the test
// Alice should send all money from her side to Bob.
channelCapacity := btcutil.Amount(paymentAmt * 2000)
chanPoint := ht.OpenChannel(
alice, bob, lntest.OpenChannelParams{Amt: channelCapacity},
alice, bob, chanArgs,
)
info := ht.QueryChannelByChanPoint(alice, chanPoint)

28
itest/lnd_remote_signer_test.go
View File

@ -60,6 +60,7 @@ func testRemoteSigner(ht *lntest.HarnessTest) {
name string
randomSeed bool
sendCoins bool
commitType lnrpc.CommitmentType
fn func(tt *lntest.HarnessTest,
wo, carol *node.HarnessNode)
}
@ -94,8 +95,19 @@ func testRemoteSigner(ht *lntest.HarnessTest) {
name: "async payments",
sendCoins: true,
fn: func(tt *lntest.HarnessTest, wo, carol *node.HarnessNode) {
runAsyncPayments(tt, wo, carol)
runAsyncPayments(tt, wo, carol, nil)
},
}, {
name: "async payments taproot",
sendCoins: true,
fn: func(tt *lntest.HarnessTest, wo, carol *node.HarnessNode) {
commitType := lnrpc.CommitmentType_SIMPLE_TAPROOT
runAsyncPayments(
tt, wo, carol, &commitType,
)
},
commitType: lnrpc.CommitmentType_SIMPLE_TAPROOT,
}, {
name: "shared key",
fn: func(tt *lntest.HarnessTest, wo, carol *node.HarnessNode) {
@ -199,11 +211,18 @@ func testRemoteSigner(ht *lntest.HarnessTest) {
require.NoError(st, err)
}
var commitArgs []string
if subTest.commitType == lnrpc.CommitmentType_SIMPLE_TAPROOT {
commitArgs = lntest.NodeArgsForCommitType(
subTest.commitType,
)
}
// WatchOnly is the node that has a watch-only wallet and uses
// the Signer node for any operation that requires access to
// private keys.
watchOnly := st.NewNodeRemoteSigner(
"WatchOnly", []string{
"WatchOnly", append([]string{
"--remotesigner.enable",
fmt.Sprintf(
"--remotesigner.rpchost=localhost:%d",
@ -217,7 +236,8 @@ func testRemoteSigner(ht *lntest.HarnessTest) {
"--remotesigner.macaroonpath=%s",
signer.Cfg.AdminMacPath,
),
}, password, &lnrpc.WatchOnly{
}, commitArgs...),
password, &lnrpc.WatchOnly{
MasterKeyBirthdayTimestamp: 0,
MasterKeyFingerprint: nil,
Accounts: watchOnlyAccounts,
@ -235,7 +255,7 @@ func testRemoteSigner(ht *lntest.HarnessTest) {
)
}
carol := st.NewNode("carol", nil)
carol := st.NewNode("carol", commitArgs)
st.EnsureConnected(watchOnly, carol)
return signer, watchOnly, carol

287
lnrpc/signrpc/signer.pb.go
View File

@ -1383,6 +1383,13 @@ type MuSig2SessionRequest struct {
// experimental RPC was already released. Some of those changes affect how the
// combined key and nonces are created.
Version MuSig2Version `protobuf:"varint,6,opt,name=version,proto3,enum=signrpc.MuSig2Version" json:"version,omitempty"`
// A set of pre generated secret local nonces to use in the musig2 session.
// This field is optional. This can be useful for protocols that need to send
// nonces ahead of time before the set of signer keys are known. This value
// MUST be 97 bytes and be the concatenation of two CSPRNG generated 32 byte
// values and local public key used for signing as specified in the key_loc
// field.
PregeneratedLocalNonce []byte `protobuf:"bytes,7,opt,name=pregenerated_local_nonce,json=pregeneratedLocalNonce,proto3" json:"pregenerated_local_nonce,omitempty"`
}
func (x *MuSig2SessionRequest) Reset() {
@ -1459,6 +1466,13 @@ func (x *MuSig2SessionRequest) GetVersion() MuSig2Version {
return MuSig2Version_MUSIG2_VERSION_UNDEFINED
}
func (x *MuSig2SessionRequest) GetPregeneratedLocalNonce() []byte {
if x != nil {
return x.PregeneratedLocalNonce
}
return nil
}
type MuSig2SessionResponse struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@ -2128,7 +2142,7 @@ var file_signrpc_signer_proto_rawDesc = []byte{
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@ -2149,142 +2163,145 @@ var file_signrpc_signer_proto_rawDesc = []byte{
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}
var (

12
lnrpc/signrpc/signer.proto
View File

@ -558,6 +558,16 @@ message MuSig2SessionRequest {
combined key and nonces are created.
*/
MuSig2Version version = 6;
/*
A set of pre generated secret local nonces to use in the musig2 session.
This field is optional. This can be useful for protocols that need to send
nonces ahead of time before the set of signer keys are known. This value
MUST be 97 bytes and be the concatenation of two CSPRNG generated 32 byte
values and local public key used for signing as specified in the key_loc
field.
*/
bytes pregenerated_local_nonce = 7;
}
message MuSig2SessionResponse {
@ -684,4 +694,4 @@ message MuSig2CleanupRequest {
}
message MuSig2CleanupResponse {
}
}

5
lnrpc/signrpc/signer.swagger.json
View File

@ -636,6 +636,11 @@
"version": {
"$ref": "#/definitions/signrpcMuSig2Version",
"description": "The mandatory version of the MuSig2 BIP draft to use. This is necessary to\ndifferentiate between the changes that were made to the BIP while this\nexperimental RPC was already released. Some of those changes affect how the\ncombined key and nonces are created."
},
"pregenerated_local_nonce": {
"type": "string",
"format": "byte",
"description": "A set of pre generated secret local nonces to use in the musig2 session.\nThis field is optional. This can be useful for protocols that need to send\nnonces ahead of time before the set of signer keys are known. This value\nMUST be 97 bytes and be the concatenation of two CSPRNG generated 32 byte\nvalues and local public key used for signing as specified in the key_loc\nfield."
}
}
},

56
lnrpc/signrpc/signer_server.go
View File

@ -875,6 +875,41 @@ func (s *Server) MuSig2CombineKeys(_ context.Context,
}, nil
}
// secNonceToPubNonce takes our two secret nonces, and produces their two
// corresponding EC points, serialized in compressed format.
//
// NOTE: This was copied from btcsuite/btcec/musig2/nonces.go.
func secNonceToPubNonce(secNonce [musig2.SecNonceSize]byte,
) [musig2.PubNonceSize]byte {
var k1Mod, k2Mod btcec.ModNScalar
k1Mod.SetByteSlice(secNonce[:btcec.PrivKeyBytesLen])
k2Mod.SetByteSlice(secNonce[btcec.PrivKeyBytesLen:])
var r1, r2 btcec.JacobianPoint
btcec.ScalarBaseMultNonConst(&k1Mod, &r1)
btcec.ScalarBaseMultNonConst(&k2Mod, &r2)
// Next, we'll convert the key in jacobian format to a normal public
// key expressed in affine coordinates.
r1.ToAffine()
r2.ToAffine()
r1Pub := btcec.NewPublicKey(&r1.X, &r1.Y)
r2Pub := btcec.NewPublicKey(&r2.X, &r2.Y)
var pubNonce [musig2.PubNonceSize]byte
// The public nonces are serialized as: R1 || R2, where both keys are
// serialized in compressed format.
copy(pubNonce[:], r1Pub.SerializeCompressed())
copy(
pubNonce[btcec.PubKeyBytesLenCompressed:],
r2Pub.SerializeCompressed(),
)
return pubNonce
}
// MuSig2CreateSession creates a new MuSig2 signing session using the local
// key identified by the key locator. The complete list of all public keys of
// all signing parties must be provided, including the public key of the local
@ -921,6 +956,26 @@ func (s *Server) MuSig2CreateSession(_ context.Context,
len(in.OtherSignerPublicNonces), maxNonces)
}
var localNonces *musig2.Nonces
// If the pre generated local nonces were specified, then check to make
// sure they're the correct size and format.
nonceLen := len(in.PregeneratedLocalNonce)
switch {
case nonceLen != 0 && nonceLen != musig2.SecNonceSize:
return nil, fmt.Errorf("local nonces must be %v bytes, "+
"instead was %v", musig2.SecNonceSize, nonceLen)
case nonceLen == musig2.SecNonceSize:
var secNonce [musig2.SecNonceSize]byte
copy(secNonce[:], in.PregeneratedLocalNonce)
localNonces = &musig2.Nonces{
SecNonce: secNonce,
PubNonce: secNonceToPubNonce(secNonce),
}
}
// Parse all other nonces we might already know.
otherSignerNonces, err := parseMuSig2PublicNonces(
in.OtherSignerPublicNonces, true,
@ -939,6 +994,7 @@ func (s *Server) MuSig2CreateSession(_ context.Context,
// Register the session with the internal wallet/signer now.
session, err := s.cfg.Signer.MuSig2CreateSession(
version, keyLoc, allSignerPubKeys, tweaks, otherSignerNonces,
localNonces,
)
if err != nil {
return nil, fmt.Errorf("error registering session: %v", err)

2
lntest/mock/signer.go
View File

@ -57,7 +57,7 @@ func (d *DummySigner) ComputeInputScript(tx *wire.MsgTx,
// submitted as well to reduce the number of method calls necessary later on.
func (d *DummySigner) MuSig2CreateSession(input.MuSig2Version,
keychain.KeyLocator, []*btcec.PublicKey, *input.MuSig2Tweaks,
[][musig2.PubNonceSize]byte, ...musig2.SessionOption,
[][musig2.PubNonceSize]byte, *musig2.Nonces,
) (*input.MuSig2SessionInfo, error) {
return nil, nil

2
lnwallet/musig_session.go
View File

@ -260,7 +260,7 @@ func (m *MusigSession) FinalizeSession(signingNonce musig2.Nonces) error {
m.session, err = m.signer.MuSig2CreateSession(
input.MuSig2Version100RC2, m.localKey.KeyLocator, m.signerKeys,
&tweakDesc, [][musig2.PubNonceSize]byte{remoteNonce.PubNonce},
musig2.WithPreGeneratedNonce(&localNonce),
&localNonce,
)
if err != nil {
return err

8
lnwallet/rpcwallet/rpcwallet.go
View File

@ -657,15 +657,13 @@ func (r *RPCKeyRing) ComputeInputScript(tx *wire.MsgTx,
func (r *RPCKeyRing) MuSig2CreateSession(bipVersion input.MuSig2Version,
keyLoc keychain.KeyLocator, pubKeys []*btcec.PublicKey,
tweaks *input.MuSig2Tweaks, otherNonces [][musig2.PubNonceSize]byte,
_ ...musig2.SessionOption) (*input.MuSig2SessionInfo, error) {
localNonces *musig2.Nonces) (*input.MuSig2SessionInfo, error) {
apiVersion, err := signrpc.MarshalMuSig2Version(bipVersion)
if err != nil {
return nil, err
}
// TODO(roasbeef): add protos to specify session options
// We need to serialize all data for the RPC call. We can do that by
// putting everything directly into the request struct.
req := &signrpc.MuSig2SessionRequest{
@ -708,6 +706,10 @@ func (r *RPCKeyRing) MuSig2CreateSession(bipVersion input.MuSig2Version,
}
}
if localNonces != nil {
req.PregeneratedLocalNonce = localNonces.SecNonce[:]
}
ctxt, cancel := context.WithTimeout(context.Background(), r.rpcTimeout)
defer cancel()

2
watchtower/wtmock/signer.go
View File

@ -72,7 +72,7 @@ func (s *MockSigner) ComputeInputScript(tx *wire.MsgTx,
func (s *MockSigner) MuSig2CreateSession(input.MuSig2Version,
keychain.KeyLocator, []*btcec.PublicKey, *input.MuSig2Tweaks,
[][musig2.PubNonceSize]byte,
...musig2.SessionOption) (*input.MuSig2SessionInfo, error) {
*musig2.Nonces) (*input.MuSig2SessionInfo, error) {
return nil, nil
}