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signrpc: add schnorr sig to sign and validate msg

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This commit is contained in:
ErikEk
2022-06-23 15:35:29 +02:00
committed by Oliver Gugger
parent 9d568cc119
commit b5af0ce327
8 changed files with 449 additions and 213 deletions
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451
lnrpc/signrpc/signer.pb.go
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@@ -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)