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signrpc: add DeriveSharedKey

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This commit is contained in:
Oliver Gugger 2019-11-28 10:58:51 +01:00
parent 6fef37cc06
commit 33e8077181
No known key found for this signature in database
GPG Key ID: 8E4256593F177720
3 changed files with 255 additions and 44 deletions
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222
lnrpc/signrpc/signer.pb.go
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@ -662,6 +662,86 @@ func (m *VerifyMessageResp) GetValid() bool {
return false
}
type SharedKeyRequest struct {
// The ephemeral public key to use for the DH key derivation.
EphemeralPubkey []byte `protobuf:"bytes,1,opt,name=ephemeral_pubkey,json=ephemeralPubkey,proto3" json:"ephemeral_pubkey,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *SharedKeyRequest) Reset() { *m = SharedKeyRequest{} }
func (m *SharedKeyRequest) String() string { return proto.CompactTextString(m) }
func (*SharedKeyRequest) ProtoMessage() {}
func (*SharedKeyRequest) Descriptor() ([]byte, []int) {
return fileDescriptor_4ecd772f6c7ffacf, []int{12}
}
func (m *SharedKeyRequest) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_SharedKeyRequest.Unmarshal(m, b)
}
func (m *SharedKeyRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_SharedKeyRequest.Marshal(b, m, deterministic)
}
func (m *SharedKeyRequest) XXX_Merge(src proto.Message) {
xxx_messageInfo_SharedKeyRequest.Merge(m, src)
}
func (m *SharedKeyRequest) XXX_Size() int {
return xxx_messageInfo_SharedKeyRequest.Size(m)
}
func (m *SharedKeyRequest) XXX_DiscardUnknown() {
xxx_messageInfo_SharedKeyRequest.DiscardUnknown(m)
}
var xxx_messageInfo_SharedKeyRequest proto.InternalMessageInfo
func (m *SharedKeyRequest) GetEphemeralPubkey() []byte {
if m != nil {
return m.EphemeralPubkey
}
return nil
}
type SharedKeyResponse struct {
// The shared public key, hashed with sha256.
SharedKey []byte `protobuf:"bytes,1,opt,name=shared_key,json=sharedKey,proto3" json:"shared_key,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *SharedKeyResponse) Reset() { *m = SharedKeyResponse{} }
func (m *SharedKeyResponse) String() string { return proto.CompactTextString(m) }
func (*SharedKeyResponse) ProtoMessage() {}
func (*SharedKeyResponse) Descriptor() ([]byte, []int) {
return fileDescriptor_4ecd772f6c7ffacf, []int{13}
}
func (m *SharedKeyResponse) XXX_Unmarshal(b []byte) error {
return xxx_messageInfo_SharedKeyResponse.Unmarshal(m, b)
}
func (m *SharedKeyResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
return xxx_messageInfo_SharedKeyResponse.Marshal(b, m, deterministic)
}
func (m *SharedKeyResponse) XXX_Merge(src proto.Message) {
xxx_messageInfo_SharedKeyResponse.Merge(m, src)
}
func (m *SharedKeyResponse) XXX_Size() int {
return xxx_messageInfo_SharedKeyResponse.Size(m)
}
func (m *SharedKeyResponse) XXX_DiscardUnknown() {
xxx_messageInfo_SharedKeyResponse.DiscardUnknown(m)
}
var xxx_messageInfo_SharedKeyResponse proto.InternalMessageInfo
func (m *SharedKeyResponse) GetSharedKey() []byte {
if m != nil {
return m.SharedKey
}
return nil
}
func init() {
proto.RegisterType((*KeyLocator)(nil), "signrpc.KeyLocator")
proto.RegisterType((*KeyDescriptor)(nil), "signrpc.KeyDescriptor")
@ -675,55 +755,62 @@ func init() {
proto.RegisterType((*SignMessageResp)(nil), "signrpc.SignMessageResp")
proto.RegisterType((*VerifyMessageReq)(nil), "signrpc.VerifyMessageReq")
proto.RegisterType((*VerifyMessageResp)(nil), "signrpc.VerifyMessageResp")
proto.RegisterType((*SharedKeyRequest)(nil), "signrpc.SharedKeyRequest")
proto.RegisterType((*SharedKeyResponse)(nil), "signrpc.SharedKeyResponse")
}
func init() { proto.RegisterFile("signrpc/signer.proto", fileDescriptor_4ecd772f6c7ffacf) }
var fileDescriptor_4ecd772f6c7ffacf = []byte{
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}
// Reference imports to suppress errors if they are not otherwise used.
@ -774,6 +861,14 @@ type SignerClient interface {
//The main difference to VerifyMessage in the main RPC is that the public key
//used to sign the message does not have to be a node known to the network.
VerifyMessage(ctx context.Context, in *VerifyMessageReq, opts ...grpc.CallOption) (*VerifyMessageResp, error)
//
//DeriveSharedKey returns a shared secret key by performing Diffie-Hellman key
//derivation between the ephemeral public key in the request and the node's
//identity private key:
//P_shared = privKeyNodeID * ephemeralPubkey
//The resulting shared public key is serialized in the compressed format and
//hashed with sha256, resulting in the final key length of 256bit.
DeriveSharedKey(ctx context.Context, in *SharedKeyRequest, opts ...grpc.CallOption) (*SharedKeyResponse, error)
}
type signerClient struct {
@ -820,6 +915,15 @@ func (c *signerClient) VerifyMessage(ctx context.Context, in *VerifyMessageReq,
return out, nil
}
func (c *signerClient) DeriveSharedKey(ctx context.Context, in *SharedKeyRequest, opts ...grpc.CallOption) (*SharedKeyResponse, error) {
out := new(SharedKeyResponse)
err := c.cc.Invoke(ctx, "/signrpc.Signer/DeriveSharedKey", in, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}
// SignerServer is the server API for Signer service.
type SignerServer interface {
//*
@ -858,6 +962,14 @@ type SignerServer interface {
//The main difference to VerifyMessage in the main RPC is that the public key
//used to sign the message does not have to be a node known to the network.
VerifyMessage(context.Context, *VerifyMessageReq) (*VerifyMessageResp, error)
//
//DeriveSharedKey returns a shared secret key by performing Diffie-Hellman key
//derivation between the ephemeral public key in the request and the node's
//identity private key:
//P_shared = privKeyNodeID * ephemeralPubkey
//The resulting shared public key is serialized in the compressed format and
//hashed with sha256, resulting in the final key length of 256bit.
DeriveSharedKey(context.Context, *SharedKeyRequest) (*SharedKeyResponse, error)
}
func RegisterSignerServer(s *grpc.Server, srv SignerServer) {
@ -936,6 +1048,24 @@ func _Signer_VerifyMessage_Handler(srv interface{}, ctx context.Context, dec fun
return interceptor(ctx, in, info, handler)
}
func _Signer_DeriveSharedKey_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(SharedKeyRequest)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(SignerServer).DeriveSharedKey(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/signrpc.Signer/DeriveSharedKey",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(SignerServer).DeriveSharedKey(ctx, req.(*SharedKeyRequest))
}
return interceptor(ctx, in, info, handler)
}
var _Signer_serviceDesc = grpc.ServiceDesc{
ServiceName: "signrpc.Signer",
HandlerType: (*SignerServer)(nil),
@ -956,6 +1086,10 @@ var _Signer_serviceDesc = grpc.ServiceDesc{
MethodName: "VerifyMessage",
Handler: _Signer_VerifyMessage_Handler,
},
{
MethodName: "DeriveSharedKey",
Handler: _Signer_DeriveSharedKey_Handler,
},
},
Streams: []grpc.StreamDesc{},
Metadata: "signrpc/signer.proto",

20
lnrpc/signrpc/signer.proto
View File

@ -151,6 +151,16 @@ message VerifyMessageResp {
bool valid = 1;
}
message SharedKeyRequest {
// The ephemeral public key to use for the DH key derivation.
bytes ephemeral_pubkey = 1;
}
message SharedKeyResponse {
// The shared public key, hashed with sha256.
bytes shared_key = 1;
}
service Signer {
/**
SignOutputRaw is a method that can be used to generated a signature for a
@ -195,4 +205,14 @@ service Signer {
used to sign the message does not have to be a node known to the network.
*/
rpc VerifyMessage (VerifyMessageReq) returns (VerifyMessageResp);
/*
DeriveSharedKey returns a shared secret key by performing Diffie-Hellman key
derivation between the ephemeral public key in the request and the node's
identity private key:
P_shared = privKeyNodeID * ephemeralPubkey
The resulting shared public key is serialized in the compressed format and
hashed with sha256, resulting in the final key length of 256bit.
*/
rpc DeriveSharedKey (SharedKeyRequest) returns (SharedKeyResponse);
}

57
lnrpc/signrpc/signer_server.go
View File

@ -5,6 +5,7 @@ package signrpc
import (
"bytes"
"context"
"crypto/sha256"
"fmt"
"io/ioutil"
"os"
@ -62,6 +63,10 @@ var (
Entity: "signer",
Action: "read",
}},
"/signrpc.Signer/DeriveSharedKey": {{
Entity: "signer",
Action: "generate",
}},
}
// DefaultSignerMacFilename is the default name of the signer macaroon
@ -477,3 +482,55 @@ func (s *Server) VerifyMessage(ctx context.Context,
Valid: valid,
}, nil
}
// DeriveSharedKey returns a shared secret key by performing Diffie-Hellman key
// derivation between the ephemeral public key in the request and the node's
// identity private key:
// P_shared = privKeyNodeID * ephemeralPubkey
// The resulting shared public key is serialized in the compressed format and
// hashed with sha256, resulting in the final key length of 256bit.
func (s *Server) DeriveSharedKey(_ context.Context, in *SharedKeyRequest) (
*SharedKeyResponse, error) {
if len(in.EphemeralPubkey) != 33 {
return nil, fmt.Errorf("ephemeral pubkey must be " +
"serialized in compressed format")
}
ephemeralPubkey, err := btcec.ParsePubKey(
in.EphemeralPubkey, btcec.S256(),
)
if err != nil {
return nil, fmt.Errorf("unable to parse pubkey: %v", err)
}
// Derive our node's private key from the key ring.
idPrivKey, err := s.cfg.KeyRing.DerivePrivKey(keychain.KeyDescriptor{
KeyLocator: keychain.KeyLocator{
Family: keychain.KeyFamilyNodeKey,
Index: 0,
},
})
if err != nil {
err := fmt.Errorf("unable to derive node private key: %v", err)
log.Error(err)
return nil, err
}
idPrivKey.Curve = btcec.S256()
// Derive the shared key using ECDH and hashing the serialized
// compressed shared point.
sharedKeyHash := ecdh(ephemeralPubkey, idPrivKey)
return &SharedKeyResponse{SharedKey: sharedKeyHash}, nil
}
// ecdh performs an ECDH operation between pub and priv. The returned value is
// the sha256 of the compressed shared point.
func ecdh(pub *btcec.PublicKey, priv *btcec.PrivateKey) []byte {
s := &btcec.PublicKey{}
x, y := btcec.S256().ScalarMult(pub.X, pub.Y, priv.D.Bytes())
s.X = x
s.Y = y
h := sha256.Sum256(s.SerializeCompressed())
return h[:]
}