diff --git a/docs/release-notes/release-notes-0.17.0.md b/docs/release-notes/release-notes-0.17.0.md index 3f4cf7ceb..4e0b89e09 100644 --- a/docs/release-notes/release-notes-0.17.0.md +++ b/docs/release-notes/release-notes-0.17.0.md @@ -244,6 +244,13 @@ 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 diff --git a/lnrpc/signrpc/signer.pb.go b/lnrpc/signrpc/signer.pb.go index 5a7241485..08980f264 100644 --- a/lnrpc/signrpc/signer.pb.go +++ b/lnrpc/signrpc/signer.pb.go @@ -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{ 0x0a, 0x07, 0x76, 0x65, 0x72, 0x73, 0x69, 0x6f, 0x6e, 0x18, 0x04, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x16, 0x2e, 0x73, 0x69, 0x67, 0x6e, 0x72, 0x70, 0x63, 0x2e, 0x4d, 0x75, 0x53, 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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 { -} \ No newline at end of file +} diff --git a/lnrpc/signrpc/signer.swagger.json b/lnrpc/signrpc/signer.swagger.json index d83b1df75..b1f511097 100644 --- a/lnrpc/signrpc/signer.swagger.json +++ b/lnrpc/signrpc/signer.swagger.json @@ -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." } } }, diff --git a/lnrpc/signrpc/signer_server.go b/lnrpc/signrpc/signer_server.go index abbd6592c..a8f2acf2a 100644 --- a/lnrpc/signrpc/signer_server.go +++ b/lnrpc/signrpc/signer_server.go @@ -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) diff --git a/lnwallet/rpcwallet/rpcwallet.go b/lnwallet/rpcwallet/rpcwallet.go index d805ed45b..69e1f25b7 100644 --- a/lnwallet/rpcwallet/rpcwallet.go +++ b/lnwallet/rpcwallet/rpcwallet.go @@ -664,8 +664,6 @@ func (r *RPCKeyRing) MuSig2CreateSession(bipVersion input.MuSig2Version, 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()