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signrpc: SharedKeyRequest accept raw pubkey

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This commit is contained in:
yyforyongyu 2020-07-28 05:39:12 +08:00
parent 6efeee4d88
commit 1c80f9818f
No known key found for this signature in database
GPG Key ID: 9BCD95C4FF296868
4 changed files with 190 additions and 106 deletions
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135
lnrpc/signrpc/signer.pb.go
View File

@ -673,12 +673,18 @@ 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"`
//
//The optional key locator of the local key that should be used. If this
//parameter is not set then the node's identity private key will be used.
KeyLoc *KeyLocator `protobuf:"bytes,2,opt,name=key_loc,json=keyLoc,proto3" json:"key_loc,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
//Deprecated. The optional key locator of the local key that should be used.
//If this parameter is not set then the node's identity private key will be
//used.
KeyLoc *KeyLocator `protobuf:"bytes,2,opt,name=key_loc,json=keyLoc,proto3" json:"key_loc,omitempty"` // Deprecated: Do not use.
//
//A key descriptor describes the key used for performing ECDH. Either a key
//locator or a raw public key is expected, if neither is supplied, defaults to
//the node's identity private key.
KeyDesc *KeyDescriptor `protobuf:"bytes,3,opt,name=key_desc,json=keyDesc,proto3" json:"key_desc,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
}
func (m *SharedKeyRequest) Reset() { *m = SharedKeyRequest{} }
@ -713,6 +719,7 @@ func (m *SharedKeyRequest) GetEphemeralPubkey() []byte {
return nil
}
// Deprecated: Do not use.
func (m *SharedKeyRequest) GetKeyLoc() *KeyLocator {
if m != nil {
return m.KeyLoc
@ -720,6 +727,13 @@ func (m *SharedKeyRequest) GetKeyLoc() *KeyLocator {
return nil
}
func (m *SharedKeyRequest) GetKeyDesc() *KeyDescriptor {
if m != nil {
return m.KeyDesc
}
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"`
@ -780,55 +794,56 @@ func init() {
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.
@ -882,8 +897,9 @@ type SignerClient interface {
//
//DeriveSharedKey returns a shared secret key by performing Diffie-Hellman key
//derivation between the ephemeral public key in the request and the node's
//key specified in the key_loc parameter (or the node's identity private key
//if no key locator is specified):
//key specified in the key_desc parameter. Either a key locator or a raw
//public key is expected in the key_desc, if neither is supplied, defaults to
//the node's identity private key:
//P_shared = privKeyNode * ephemeralPubkey
//The resulting shared public key is serialized in the compressed format and
//hashed with sha256, resulting in the final key length of 256bit.
@ -984,8 +1000,9 @@ type SignerServer interface {
//
//DeriveSharedKey returns a shared secret key by performing Diffie-Hellman key
//derivation between the ephemeral public key in the request and the node's
//key specified in the key_loc parameter (or the node's identity private key
//if no key locator is specified):
//key specified in the key_desc parameter. Either a key locator or a raw
//public key is expected in the key_desc, if neither is supplied, defaults to
//the node's identity private key:
//P_shared = privKeyNode * ephemeralPubkey
//The resulting shared public key is serialized in the compressed format and
//hashed with sha256, resulting in the final key length of 256bit.

19
lnrpc/signrpc/signer.proto
View File

@ -54,8 +54,9 @@ service Signer {
/*
DeriveSharedKey returns a shared secret key by performing Diffie-Hellman key
derivation between the ephemeral public key in the request and the node's
key specified in the key_loc parameter (or the node's identity private key
if no key locator is specified):
key specified in the key_desc parameter. Either a key locator or a raw
public key is expected in the key_desc, if neither is supplied, defaults to
the node's identity private key:
P_shared = privKeyNode * ephemeralPubkey
The resulting shared public key is serialized in the compressed format and
hashed with sha256, resulting in the final key length of 256bit.
@ -220,10 +221,18 @@ message SharedKeyRequest {
bytes ephemeral_pubkey = 1;
/*
The optional key locator of the local key that should be used. If this
parameter is not set then the node's identity private key will be used.
Deprecated. The optional key locator of the local key that should be used.
If this parameter is not set then the node's identity private key will be
used.
*/
KeyLocator key_loc = 2;
KeyLocator key_loc = 2 [deprecated = true];
/*
A key descriptor describes the key used for performing ECDH. Either a key
locator or a raw public key is expected, if neither is supplied, defaults to
the node's identity private key.
*/
KeyDescriptor key_desc = 3;
}
message SharedKeyResponse {

8
lnrpc/signrpc/signer.swagger.json
View File

@ -47,7 +47,7 @@
},
"/v2/signer/sharedkey": {
"post": {
"summary": "DeriveSharedKey returns a shared secret key by performing Diffie-Hellman key\nderivation between the ephemeral public key in the request and the node's\nkey specified in the key_loc parameter (or the node's identity private key\nif no key locator is specified):\nP_shared = privKeyNode * ephemeralPubkey\nThe resulting shared public key is serialized in the compressed format and\nhashed with sha256, resulting in the final key length of 256bit.",
"summary": "DeriveSharedKey returns a shared secret key by performing Diffie-Hellman key\nderivation between the ephemeral public key in the request and the node's\nkey specified in the key_desc parameter. Either a key locator or a raw\npublic key is expected in the key_desc, if neither is supplied, defaults to\nthe node's identity private key:\nP_shared = privKeyNode * ephemeralPubkey\nThe resulting shared public key is serialized in the compressed format and\nhashed with sha256, resulting in the final key length of 256bit.",
"operationId": "DeriveSharedKey",
"responses": {
"200": {
@ -284,7 +284,11 @@
},
"key_loc": {
"$ref": "#/definitions/signrpcKeyLocator",
"description": "The optional key locator of the local key that should be used. If this\nparameter is not set then the node's identity private key will be used."
"description": "Deprecated. The optional key locator of the local key that should be used.\nIf this parameter is not set then the node's identity private key will be\nused."
},
"key_desc": {
"$ref": "#/definitions/signrpcKeyDescriptor",
"description": "A key descriptor describes the key used for performing ECDH. Either a key\nlocator or a raw public key is expected, if neither is supplied, defaults to\nthe node's identity private key."
}
}
},

134
lnrpc/signrpc/signer_server.go
View File

@ -254,27 +254,11 @@ func (s *Server) SignOutputRaw(ctx context.Context, in *SignReq) (*SignResp, err
// If this method doesn't return nil, then we know that user is
// attempting to include a raw serialized pub key.
if keyDesc.GetRawKeyBytes() != nil {
rawKeyBytes := keyDesc.GetRawKeyBytes()
switch {
// If the user provided a raw key, but it's of the
// wrong length, then we'll return with an error.
case len(rawKeyBytes) != 0 && len(rawKeyBytes) != 33:
return nil, fmt.Errorf("pubkey must be " +
"serialized in compressed format if " +
"specified")
// If a proper raw key was provided, then we'll attempt
// to decode and parse it.
case len(rawKeyBytes) != 0 && len(rawKeyBytes) == 33:
targetPubKey, err = btcec.ParsePubKey(
rawKeyBytes, btcec.S256(),
)
if err != nil {
return nil, fmt.Errorf("unable to "+
"parse pubkey: %v", err)
}
targetPubKey, err = parseRawKeyBytes(
keyDesc.GetRawKeyBytes(),
)
if err != nil {
return nil, err
}
}
@ -507,38 +491,82 @@ func (s *Server) VerifyMessage(ctx context.Context,
// DeriveSharedKey returns a shared secret key by performing Diffie-Hellman key
// derivation between the ephemeral public key in the request and the node's
// key specified in the key_loc parameter (or the node's identity private key
// if no key locator is specified):
// P_shared = privKeyNode * ephemeralPubkey
// key specified in the key_desc parameter. Either a key locator or a raw public
// key is expected in the key_desc, if neither is supplied, defaults to the
// node's identity private key. The old key_loc parameter in the request
// shouldn't be used anymore.
// 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(),
)
// Check that EphemeralPubkey is valid.
ephemeralPubkey, err := parseRawKeyBytes(in.EphemeralPubkey)
if err != nil {
return nil, fmt.Errorf("unable to parse pubkey: %v", err)
return nil, fmt.Errorf("error in ephemeral pubkey: %v", err)
}
if ephemeralPubkey == nil {
return nil, fmt.Errorf("must provide ephemeral pubkey")
}
// By default, use the node identity private key.
locator := keychain.KeyLocator{
Family: keychain.KeyFamilyNodeKey,
Index: 0,
// Check for backward compatibility. The caller either specifies the old
// key_loc field, or the new key_desc field, but not both.
if in.KeyDesc != nil && in.KeyLoc != nil {
return nil, fmt.Errorf("use either key_desc or key_loc")
}
if in.KeyLoc != nil {
locator.Family = keychain.KeyFamily(in.KeyLoc.KeyFamily)
locator.Index = uint32(in.KeyLoc.KeyIndex)
// When key_desc is used, the key_desc.key_loc is expected as the caller
// needs to specify the KeyFamily.
if in.KeyDesc != nil && in.KeyDesc.KeyLoc == nil {
return nil, fmt.Errorf("when setting key_desc the field " +
"key_desc.key_loc must also be set")
}
// We extract two params, rawKeyBytes and keyLoc. Notice their initial
// values will be overwritten if not using the deprecated RPC param.
var rawKeyBytes []byte
keyLoc := in.KeyLoc
if in.KeyDesc != nil {
keyLoc = in.KeyDesc.GetKeyLoc()
rawKeyBytes = in.KeyDesc.GetRawKeyBytes()
}
// When no keyLoc is supplied, defaults to the node's identity private
// key.
if keyLoc == nil {
keyLoc = &KeyLocator{
KeyFamily: int32(keychain.KeyFamilyNodeKey),
KeyIndex: 0,
}
}
// Check the caller is using either the key index or the raw public key
// to perform the ECDH, we can't have both.
if rawKeyBytes != nil && keyLoc.KeyIndex != 0 {
return nil, fmt.Errorf("use either raw_key_bytes or key_index")
}
// Check the raw public key is valid. Notice that if the rawKeyBytes is
// empty, the parseRawKeyBytes won't return an error, a nil
// *btcec.PublicKey is returned instead.
pk, err := parseRawKeyBytes(rawKeyBytes)
if err != nil {
return nil, fmt.Errorf("error in raw pubkey: %v", err)
}
// Create a key descriptor. When the KeyIndex is not specified, it uses
// the empty value 0, and when the raw public key is not specified, the
// pk is nil.
keyDescriptor := keychain.KeyDescriptor{
KeyLocator: keychain.KeyLocator{
Family: keychain.KeyFamily(keyLoc.KeyFamily),
Index: uint32(keyLoc.KeyIndex),
},
PubKey: pk,
}
// Derive the shared key using ECDH and hashing the serialized
// compressed shared point.
keyDescriptor := keychain.KeyDescriptor{KeyLocator: locator}
sharedKeyHash, err := s.cfg.KeyRing.ECDH(keyDescriptor, ephemeralPubkey)
if err != nil {
err := fmt.Errorf("unable to derive shared key: %v", err)
@ -548,3 +576,29 @@ func (s *Server) DeriveSharedKey(_ context.Context, in *SharedKeyRequest) (
return &SharedKeyResponse{SharedKey: sharedKeyHash[:]}, nil
}
// parseRawKeyBytes checks that the provided raw public key is valid and returns
// the public key. A nil public key is returned if the length of the rawKeyBytes
// is zero.
func parseRawKeyBytes(rawKeyBytes []byte) (*btcec.PublicKey, error) {
switch {
case len(rawKeyBytes) == 33:
// If a proper raw key was provided, then we'll attempt
// to decode and parse it.
return btcec.ParsePubKey(
rawKeyBytes, btcec.S256(),
)
case len(rawKeyBytes) == 0:
// No key is provided, return nil.
return nil, nil
default:
// If the user provided a raw key, but it's of the
// wrong length, then we'll return with an error.
return nil, fmt.Errorf("pubkey must be " +
"serialized in compressed format if " +
"specified")
}
}