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multi: refactor SignDigest into SignMessage
To make it possible to use a remote signrpc server as a signer for our wallet, we need to change our main interface to sign the message instead of the message's digest. Otherwise we'd need to alter the signrpc.SignMessage RPC to accept a digest instead of only the message which has security implications.
This commit is contained in:
Oliver Gugger
@@ -548,6 +548,8 @@ type SignMessageReq struct {
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Msg []byte `protobuf:"bytes,1,opt,name=msg,proto3" json:"msg,omitempty"`
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// The key locator that identifies which key to use for signing.
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KeyLoc *KeyLocator `protobuf:"bytes,2,opt,name=key_loc,json=keyLoc,proto3" json:"key_loc,omitempty"`
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// Double-SHA256 hash instead of just the default single round.
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DoubleHash bool `protobuf:"varint,3,opt,name=double_hash,json=doubleHash,proto3" json:"double_hash,omitempty"`
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}
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func (x *SignMessageReq) Reset() {
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@@ -596,6 +598,13 @@ func (x *SignMessageReq) GetKeyLoc() *KeyLocator {
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return nil
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}
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func (x *SignMessageReq) GetDoubleHash() bool {
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if x != nil {
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return x.DoubleHash
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}
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return false
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}
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type SignMessageResp struct {
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state protoimpl.MessageState
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sizeCache protoimpl.SizeCache
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@@ -939,62 +948,64 @@ var file_signrpc_signer_proto_rawDesc = []byte{
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0x69, 0x6e, 0x67, 0x6e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x2f, 0x6c, 0x6e, 0x64, 0x2f, 0x6c,
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0x6e, 0x72, 0x70, 0x63, 0x2f, 0x73, 0x69, 0x67, 0x6e, 0x72, 0x70, 0x63, 0x62, 0x06, 0x70, 0x72,
|
||||
0x6f, 0x74, 0x6f, 0x33,
|
||||
}
|
||||
|
||||
var (
|
||||
|
||||
@@ -190,6 +190,9 @@ message SignMessageReq {
|
||||
|
||||
// The key locator that identifies which key to use for signing.
|
||||
KeyLocator key_loc = 2;
|
||||
|
||||
// Double-SHA256 hash instead of just the default single round.
|
||||
bool double_hash = 3;
|
||||
}
|
||||
message SignMessageResp {
|
||||
/*
|
||||
|
||||
@@ -354,6 +354,10 @@
|
||||
"key_loc": {
|
||||
"$ref": "#/definitions/signrpcKeyLocator",
|
||||
"description": "The key locator that identifies which key to use for signing."
|
||||
},
|
||||
"double_hash": {
|
||||
"type": "boolean",
|
||||
"description": "Double-SHA256 hash instead of just the default single round."
|
||||
}
|
||||
}
|
||||
},
|
||||
|
||||
@@ -446,7 +446,7 @@ func (s *Server) ComputeInputScript(ctx context.Context,
|
||||
|
||||
// SignMessage signs a message with the key specified in the key locator. The
|
||||
// returned signature is fixed-size LN wire format encoded.
|
||||
func (s *Server) SignMessage(ctx context.Context,
|
||||
func (s *Server) SignMessage(_ context.Context,
|
||||
in *SignMessageReq) (*SignMessageResp, error) {
|
||||
|
||||
if in.Msg == nil {
|
||||
@@ -464,13 +464,11 @@ func (s *Server) SignMessage(ctx context.Context,
|
||||
},
|
||||
}
|
||||
|
||||
// The signature is over the sha256 hash of the message.
|
||||
var digest [32]byte
|
||||
copy(digest[:], chainhash.HashB(in.Msg))
|
||||
|
||||
// Create the raw ECDSA signature first and convert it to the final wire
|
||||
// format after.
|
||||
sig, err := s.cfg.KeyRing.SignDigest(keyDescriptor, digest)
|
||||
sig, err := s.cfg.KeyRing.SignMessage(
|
||||
keyDescriptor, in.Msg, in.DoubleHash,
|
||||
)
|
||||
if err != nil {
|
||||
return nil, fmt.Errorf("can't sign the hash: %v", err)
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user