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Merge pull request #6722 from guggero/sign-schnorr-tweaked

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signrpc: add Schnorr signatures to sign and verify message
This commit is contained in:
Oliver Gugger 2022-07-14 14:51:47 +02:00 committed by GitHub
commit af97b8f877
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
12 changed files with 575 additions and 221 deletions
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3
docs/release-notes/release-notes-0.15.1.md
View File

@ -57,6 +57,9 @@
responses. In addition to that, errors returned from `lnd` can now also be
intercepted and changed by the middleware.
* The `signrpc.SignMessage` and `signrpc.VerifyMessage` now supports [Schnorr
signatures](https://github.com/lightningnetwork/lnd/pull/6722).
## Bug Fixes
* Fixed data race found in

32
keychain/btcwallet.go
View File

@ -6,7 +6,9 @@ import (
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/ecdsa"
"github.com/btcsuite/btcd/btcec/v2/schnorr"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcwallet/waddrmgr"
"github.com/btcsuite/btcwallet/wallet"
"github.com/btcsuite/btcwallet/walletdb"
@ -452,3 +454,33 @@ func (b *BtcWalletKeyRing) SignMessageCompact(keyLoc KeyLocator,
}
return ecdsa.SignCompact(privKey, digest, true)
}
// SignMessageSchnorr uses the Schnorr signature algorithm to sign the given
// message, single or double SHA256 hashing it first, with the private key
// described in the key locator and the optional tweak applied to the private
// key.
//
// NOTE: This is part of the keychain.MessageSignerRing interface.
func (b *BtcWalletKeyRing) SignMessageSchnorr(keyLoc KeyLocator,
msg []byte, doubleHash bool, taprootTweak []byte) (*schnorr.Signature,
error) {
privKey, err := b.DerivePrivKey(KeyDescriptor{
KeyLocator: keyLoc,
})
if err != nil {
return nil, err
}
if len(taprootTweak) > 0 {
privKey = txscript.TweakTaprootPrivKey(privKey, taprootTweak)
}
var digest []byte
if doubleHash {
digest = chainhash.DoubleHashB(msg)
} else {
digest = chainhash.HashB(msg)
}
return schnorr.Sign(privKey, digest)
}

8
keychain/derivation.go
View File

@ -5,6 +5,7 @@ import (
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/ecdsa"
"github.com/btcsuite/btcd/btcec/v2/schnorr"
)
const (
@ -234,6 +235,13 @@ type MessageSignerRing interface {
// format.
SignMessageCompact(keyLoc KeyLocator, msg []byte,
doubleHash bool) ([]byte, error)
// SignMessageSchnorr signs the given message, single or double SHA256
// 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)
}
// SingleKeyMessageSigner is an abstraction interface that hides the

451
lnrpc/signrpc/signer.pb.go
View File

@ -651,7 +651,9 @@ type SignMessageReq struct {
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
// The message to be signed.
//
//The message to be signed. When using REST, this field must be encoded as
//base64.
Msg []byte `protobuf:"bytes,1,opt,name=msg,proto3" json:"msg,omitempty"`
// The key locator that identifies which key to use for signing.
KeyLoc *KeyLocator `protobuf:"bytes,2,opt,name=key_loc,json=keyLoc,proto3" json:"key_loc,omitempty"`
@ -659,8 +661,16 @@ type SignMessageReq struct {
DoubleHash bool `protobuf:"varint,3,opt,name=double_hash,json=doubleHash,proto3" json:"double_hash,omitempty"`
//
//Use the compact (pubkey recoverable) format instead of the raw lnwire
//format.
//format. This option cannot be used with Schnorr signatures.
CompactSig bool `protobuf:"varint,4,opt,name=compact_sig,json=compactSig,proto3" json:"compact_sig,omitempty"`
//
//Use Schnorr signature. This option cannot be used with compact format.
SchnorrSig bool `protobuf:"varint,5,opt,name=schnorr_sig,json=schnorrSig,proto3" json:"schnorr_sig,omitempty"`
//
//The optional Taproot tweak bytes to apply to the private key before creating
//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"`
}
func (x *SignMessageReq) Reset() {
@ -723,6 +733,20 @@ func (x *SignMessageReq) GetCompactSig() bool {
return false
}
func (x *SignMessageReq) GetSchnorrSig() bool {
if x != nil {
return x.SchnorrSig
}
return false
}
func (x *SignMessageReq) GetSchnorrSigTapTweak() []byte {
if x != nil {
return x.SchnorrSigTapTweak
}
return nil
}
type SignMessageResp struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@ -777,14 +801,22 @@ type VerifyMessageReq struct {
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
// The message over which the signature is to be verified.
// The message over which the signature is to be verified. When using
// REST, this field must be encoded as base64.
Msg []byte `protobuf:"bytes,1,opt,name=msg,proto3" json:"msg,omitempty"`
//
//The fixed-size LN wire encoded signature to be verified over the given
//message.
//message. When using REST, this field must be encoded as base64.
Signature []byte `protobuf:"bytes,2,opt,name=signature,proto3" json:"signature,omitempty"`
// The public key the signature has to be valid for.
//
//The public key the signature has to be valid for. When using REST, this
//field must be encoded as base64. If the is_schnorr_sig option is true, then
//the public key is expected to be in the 32-byte x-only serialization
//according to BIP-340.
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"`
}
func (x *VerifyMessageReq) Reset() {
@ -840,6 +872,13 @@ func (x *VerifyMessageReq) GetPubkey() []byte {
return nil
}
func (x *VerifyMessageReq) GetIsSchnorrSig() bool {
if x != nil {
return x.IsSchnorrSig
}
return false
}
type VerifyMessageResp struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
@ -1973,7 +2012,7 @@ var file_signrpc_signer_proto_rawDesc = []byte{
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@ -1982,204 +2021,212 @@ var file_signrpc_signer_proto_rawDesc = []byte{
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}
var (

37
lnrpc/signrpc/signer.proto
View File

@ -320,7 +320,10 @@ message InputScriptResp {
}
message SignMessageReq {
// The message to be signed.
/*
The message to be signed. When using REST, this field must be encoded as
base64.
*/
bytes msg = 1;
// The key locator that identifies which key to use for signing.
@ -331,9 +334,21 @@ message SignMessageReq {
/*
Use the compact (pubkey recoverable) format instead of the raw lnwire
format.
format. This option cannot be used with Schnorr signatures.
*/
bool compact_sig = 4;
/*
Use Schnorr signature. This option cannot be used with compact format.
*/
bool schnorr_sig = 5;
/*
The optional Taproot tweak bytes to apply to the private key before creating
a Schnorr signature. The private key is tweaked as described in BIP-341:
privKey + h_tapTweak(internalKey || tapTweak)
*/
bytes schnorr_sig_tap_tweak = 6;
}
message SignMessageResp {
/*
@ -343,18 +358,30 @@ message SignMessageResp {
}
message VerifyMessageReq {
// The message over which the signature is to be verified.
// The message over which the signature is to be verified. When using
// REST, this field must be encoded as base64.
bytes msg = 1;
/*
The fixed-size LN wire encoded signature to be verified over the given
message.
message. When using REST, this field must be encoded as base64.
*/
bytes signature = 2;
// The public key the signature has to be valid for.
/*
The public key the signature has to be valid for. When using REST, this
field must be encoded as base64. If the is_schnorr_sig option is true, then
the public key is expected to be in the 32-byte x-only serialization
according to BIP-340.
*/
bytes pubkey = 3;
/*
Specifies if the signature is a Schnorr signature.
*/
bool is_schnorr_sig = 4;
}
message VerifyMessageResp {
// Whether the signature was valid over the given message.
bool valid = 1;

23
lnrpc/signrpc/signer.swagger.json
View File

@ -767,7 +767,7 @@
"msg": {
"type": "string",
"format": "byte",
"description": "The message to be signed."
"description": "The message to be signed. When using REST, this field must be encoded as\nbase64."
},
"key_loc": {
"$ref": "#/definitions/signrpcKeyLocator",
@ -779,7 +779,16 @@
},
"compact_sig": {
"type": "boolean",
"description": "Use the compact (pubkey recoverable) format instead of the raw lnwire\nformat."
"description": "Use the compact (pubkey recoverable) format instead of the raw lnwire\nformat. This option cannot be used with Schnorr signatures."
},
"schnorr_sig": {
"type": "boolean",
"description": "Use Schnorr signature. This option cannot be used with compact format."
},
"schnorr_sig_tap_tweak": {
"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)"
}
}
},
@ -890,17 +899,21 @@
"msg": {
"type": "string",
"format": "byte",
"description": "The message over which the signature is to be verified."
"description": "The message over which the signature is to be verified. When using\nREST, this field must be encoded as base64."
},
"signature": {
"type": "string",
"format": "byte",
"description": "The fixed-size LN wire encoded signature to be verified over the given\nmessage."
"description": "The fixed-size LN wire encoded signature to be verified over the given\nmessage. When using REST, this field must be encoded as base64."
},
"pubkey": {
"type": "string",
"format": "byte",
"description": "The public key the signature has to be valid for."
"description": "The public key the signature has to be valid for. When using REST, this\nfield must be encoded as base64. If the is_schnorr_sig option is true, then\nthe public key is expected to be in the 32-byte x-only serialization\naccording to BIP-340."
},
"is_schnorr_sig": {
"type": "boolean",
"description": "Specifies if the signature is a Schnorr signature."
}
}
},

52
lnrpc/signrpc/signer_server.go
View File

@ -601,6 +601,10 @@ func (s *Server) SignMessage(_ context.Context,
if in.KeyLoc == nil {
return nil, fmt.Errorf("a key locator MUST be passed in")
}
if in.SchnorrSig && in.CompactSig {
return nil, fmt.Errorf("compact format can not be used for " +
"Schnorr signatures")
}
// Describe the private key we'll be using for signing.
keyLocator := keychain.KeyLocator{
@ -608,6 +612,27 @@ func (s *Server) SignMessage(_ context.Context,
Index: uint32(in.KeyLoc.KeyIndex),
}
// Use the schnorr signature algorithm to sign the message.
if in.SchnorrSig {
sig, err := s.cfg.KeyRing.SignMessageSchnorr(
keyLocator, in.Msg, in.DoubleHash,
in.SchnorrSigTapTweak,
)
if err != nil {
return nil, fmt.Errorf("can't sign the hash: %v", err)
}
sigParsed, err := schnorr.ParseSignature(sig.Serialize())
if err != nil {
return nil, fmt.Errorf("can't parse Schnorr "+
"signature: %v", err)
}
return &SignMessageResp{
Signature: sigParsed.Serialize(),
}, nil
}
// To allow a watch-only wallet to forward the SignMessageCompact to an
// endpoint that doesn't add the message prefix, we allow this RPC to
// also return the compact signature format instead of adding a flag to
@ -644,7 +669,7 @@ func (s *Server) SignMessage(_ context.Context,
// VerifyMessage verifies a signature over a message using the public key
// provided. The signature must be fixed-size LN wire format encoded.
func (s *Server) VerifyMessage(ctx context.Context,
func (s *Server) VerifyMessage(_ context.Context,
in *VerifyMessageReq) (*VerifyMessageResp, error) {
if in.Msg == nil {
@ -657,6 +682,31 @@ func (s *Server) VerifyMessage(ctx context.Context,
if in.Pubkey == nil {
return nil, fmt.Errorf("a pubkey to verify MUST be passed in")
}
// We allow for Schnorr signatures to be verified.
if in.IsSchnorrSig {
// We expect the public key to be in the BIP-340 32-byte format
// for Schnorr signatures.
pubkey, err := schnorr.ParsePubKey(in.Pubkey)
if err != nil {
return nil, fmt.Errorf("unable to parse pubkey: %v",
err)
}
sigParsed, err := schnorr.ParseSignature(in.Signature)
if err != nil {
return nil, fmt.Errorf("can't parse Schnorr "+
"signature: %v", err)
}
digest := chainhash.HashB(in.Msg)
valid := sigParsed.Verify(digest, pubkey)
return &VerifyMessageResp{
Valid: valid,
}, nil
}
pubkey, err := btcec.ParsePubKey(in.Pubkey)
if err != nil {
return nil, fmt.Errorf("unable to parse pubkey: %v", err)

6
lntest/itest/lnd_remote_signer_test.go
View File

@ -117,6 +117,12 @@ func testRemoteSigner(net *lntest.NetworkHarness, t *harnessTest) {
fn: func(tt *harnessTest, wo, carol *lntest.HarnessNode) {
runSignOutputRaw(tt, net, wo)
},
}, {
name: "sign verify msg",
sendCoins: true,
fn: func(tt *harnessTest, wo, carol *lntest.HarnessNode) {
runSignVerifyMessage(tt, net, wo)
},
}, {
name: "taproot",
sendCoins: true,

121
lntest/itest/lnd_signer_test.go
View File

@ -3,9 +3,11 @@ package itest
import (
"bytes"
"context"
"crypto/sha256"
"fmt"
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/schnorr"
"github.com/btcsuite/btcd/btcutil"
"github.com/btcsuite/btcd/txscript"
"github.com/btcsuite/btcd/wire"
@ -61,8 +63,12 @@ func runDeriveSharedKey(t *harnessTest, alice *lntest.HarnessNode) {
customizedKeyFamily := int32(keychain.KeyFamilyMultiSig)
customizedIndex := int32(1)
customizedPub, err := deriveCustomizedKey(
ctxb, alice, customizedKeyFamily, customizedIndex,
ctxb, alice, &signrpc.KeyLocator{
KeyFamily: customizedKeyFamily,
KeyIndex: customizedIndex,
},
)
require.NoError(t.t, err, "failed to create customized pubkey")
@ -394,14 +400,12 @@ func assertSignOutputRaw(t *harnessTest, net *lntest.NetworkHarness,
// deriveCustomizedKey uses the family and index to derive a public key from
// the node's walletkit client.
func deriveCustomizedKey(ctx context.Context, node *lntest.HarnessNode,
family, index int32) (*btcec.PublicKey, error) {
keyLoc *signrpc.KeyLocator) (*btcec.PublicKey, error) {
ctxt, _ := context.WithTimeout(ctx, defaultTimeout)
req := &signrpc.KeyLocator{
KeyFamily: family,
KeyIndex: index,
}
resp, err := node.WalletKitClient.DeriveKey(ctxt, req)
ctxt, cancel := context.WithTimeout(ctx, defaultTimeout)
defer cancel()
resp, err := node.WalletKitClient.DeriveKey(ctxt, keyLoc)
if err != nil {
return nil, fmt.Errorf("failed to derive key: %v", err)
}
@ -411,3 +415,104 @@ func deriveCustomizedKey(ctx context.Context, node *lntest.HarnessNode,
}
return pub, nil
}
// testSignVerifyMessage makes sure that the SignMessage RPC can be used with
// all custom flags by verifying with VerifyMessage. Tests both ECDSA and
// Schnorr signatures.
func testSignVerifyMessage(net *lntest.NetworkHarness, t *harnessTest) {
runSignVerifyMessage(t, net, net.Alice)
}
// runSignVerifyMessage makes sure that the SignMessage RPC can be used with all
// custom flags by verifying with VerifyMessage. Tests both ECDSA and Schnorr
// signatures.
func runSignVerifyMessage(t *harnessTest, net *lntest.NetworkHarness,
alice *lntest.HarnessNode) {
ctxb := context.Background()
ctxt, cancel := context.WithTimeout(ctxb, defaultTimeout)
defer cancel()
aliceMsg := []byte("alice msg")
keyLoc := &signrpc.KeyLocator{
KeyFamily: int32(keychain.KeyFamilyNodeKey),
KeyIndex: 1,
}
// Sign a message with the default ECDSA.
signMsgReq := &signrpc.SignMessageReq{
Msg: aliceMsg,
KeyLoc: keyLoc,
SchnorrSig: false,
}
signMsgResp, err := alice.SignerClient.SignMessage(ctxt, signMsgReq)
require.NoError(t.t, err, "failed to sign message")
customPubKey, err := deriveCustomizedKey(ctxt, alice, keyLoc)
require.NoError(t.t, err, "failed to create customized pubkey")
verifyReq := &signrpc.VerifyMessageReq{
Msg: aliceMsg,
Signature: signMsgResp.Signature,
Pubkey: customPubKey.SerializeCompressed(),
IsSchnorrSig: false,
}
verifyResp, err := alice.SignerClient.VerifyMessage(ctxt, verifyReq)
require.NoError(t.t, err)
require.True(t.t, verifyResp.Valid, "failed to verify message")
// Use a different key locator.
keyLoc = &signrpc.KeyLocator{
KeyFamily: int32(keychain.KeyFamilyNodeKey),
KeyIndex: 2,
}
// Sign a message with Schnorr signature.
signMsgReq = &signrpc.SignMessageReq{
Msg: aliceMsg,
KeyLoc: keyLoc,
SchnorrSig: true,
}
signMsgResp, err = alice.SignerClient.SignMessage(ctxt, signMsgReq)
require.NoError(t.t, err)
customPubKey, err = deriveCustomizedKey(ctxt, alice, keyLoc)
require.NoError(t.t, err, "failed to create customized pubkey")
// Verify the Schnorr signature.
verifyReq = &signrpc.VerifyMessageReq{
Msg: aliceMsg,
Signature: signMsgResp.Signature,
Pubkey: schnorr.SerializePubKey(customPubKey),
IsSchnorrSig: true,
}
verifyResp, err = alice.SignerClient.VerifyMessage(ctxt, verifyReq)
require.NoError(t.t, err)
require.True(t.t, verifyResp.Valid, "failed to verify message")
// Also test that we can tweak a private key and verify the message
// against the tweaked public key.
tweakBytes := sha256.Sum256([]byte("some text"))
tweakedPubKey := txscript.ComputeTaprootOutputKey(
customPubKey, tweakBytes[:],
)
signMsgReq.SchnorrSigTapTweak = tweakBytes[:]
signMsgResp, err = alice.SignerClient.SignMessage(ctxt, signMsgReq)
require.NoError(t.t, err)
verifyReq = &signrpc.VerifyMessageReq{
Msg: aliceMsg,
Signature: signMsgResp.Signature,
Pubkey: schnorr.SerializePubKey(tweakedPubKey),
IsSchnorrSig: true,
}
verifyResp, err = alice.SignerClient.VerifyMessage(ctxt, verifyReq)
require.NoError(t.t, err)
require.True(t.t, verifyResp.Valid, "failed to verify message")
}

4
lntest/itest/lnd_test_list_on_test.go
View File

@ -169,6 +169,10 @@ var allTestCases = []*testCase{
name: "sign output raw",
test: testSignOutputRaw,
},
{
name: "sign verify message",
test: testSignVerifyMessage,
},
{
name: "async payments benchmark",
test: testAsyncPayments,

22
lntest/mock/secretkeyring.go
View File

@ -3,7 +3,9 @@ package mock
import (
"github.com/btcsuite/btcd/btcec/v2"
"github.com/btcsuite/btcd/btcec/v2/ecdsa"
"github.com/btcsuite/btcd/btcec/v2/schnorr"
"github.com/btcsuite/btcd/chaincfg/chainhash"
"github.com/btcsuite/btcd/txscript"
"github.com/lightningnetwork/lnd/keychain"
)
@ -69,3 +71,23 @@ func (s *SecretKeyRing) SignMessageCompact(_ keychain.KeyLocator,
}
return ecdsa.SignCompact(s.RootKey, digest, true)
}
// SignMessageSchnorr signs the passed message and ignores the KeyDescriptor.
func (s *SecretKeyRing) SignMessageSchnorr(_ keychain.KeyLocator,
msg []byte, doubleHash bool, taprootTweak []byte) (*schnorr.Signature,
error) {
var digest []byte
if doubleHash {
digest = chainhash.DoubleHashB(msg)
} else {
digest = chainhash.HashB(msg)
}
privKey := s.RootKey
if len(taprootTweak) > 0 {
privKey = txscript.TweakTaprootPrivKey(privKey, taprootTweak)
}
return schnorr.Sign(privKey, digest)
}

37
lnwallet/rpcwallet/rpcwallet.go
View File

@ -488,6 +488,43 @@ func (r *RPCKeyRing) SignMessageCompact(keyLoc keychain.KeyLocator,
return resp.Signature, nil
}
// SignMessageSchnorr attempts to sign a target message with the private key
// described in the key locator. If the target private key is unable to be
// found, then an error will be returned. The actual digest signed is the
// single or double SHA-256 of the passed message.
//
// 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) {
ctxt, cancel := context.WithTimeout(context.Background(), r.rpcTimeout)
defer cancel()
resp, err := r.signerClient.SignMessage(ctxt, &signrpc.SignMessageReq{
Msg: msg,
KeyLoc: &signrpc.KeyLocator{
KeyFamily: int32(keyLoc.Family),
KeyIndex: int32(keyLoc.Index),
},
DoubleHash: doubleHash,
SchnorrSig: true,
SchnorrSigTapTweak: taprootTweak,
})
if err != nil {
considerShutdown(err)
return nil, fmt.Errorf("error signing message in remote "+
"signer instance: %v", err)
}
sigParsed, err := schnorr.ParseSignature(resp.Signature)
if err != nil {
return nil, fmt.Errorf("can't parse schnorr signature: %v",
err)
}
return sigParsed, nil
}
// DerivePrivKey attempts to derive the private key that corresponds to the
// passed key descriptor. If the public key is set, then this method will
// perform an in-order scan over the key set, with a max of MaxKeyRangeScan