crypto, crypto/ecies, crypto/secp256k1: libsecp256k1 scalar mult

thanks to Felix Lange (fjl) for help with design & impl

p2p/discover/node.go

@@ -210,7 +210,7 @@ func PubkeyID(pub *ecdsa.PublicKey) NodeID {
 // Pubkey returns the public key represented by the node ID.
 // It returns an error if the ID is not a point on the curve.
 func (id NodeID) Pubkey() (*ecdsa.PublicKey, error) {
-	p := &ecdsa.PublicKey{Curve: crypto.S256(), X: new(big.Int), Y: new(big.Int)}
+	p := &ecdsa.PublicKey{Curve: secp256k1.S256(), X: new(big.Int), Y: new(big.Int)}
 	half := len(id) / 2
 	p.X.SetBytes(id[:half])
 	p.Y.SetBytes(id[half:])

p2p/rlpx.go

@@ -277,7 +277,7 @@ func newInitiatorHandshake(remoteID discover.NodeID) (*encHandshake, error) {
 		return nil, err
 	}
 	// generate random keypair to use for signing
-	randpriv, err := ecies.GenerateKey(rand.Reader, crypto.S256(), nil)
+	randpriv, err := ecies.GenerateKey(rand.Reader, secp256k1.S256(), nil)
 	if err != nil {
 		return nil, err
 	}
@@ -376,7 +376,7 @@ func decodeAuthMsg(prv *ecdsa.PrivateKey, token []byte, auth []byte) (*encHandsh
 	var err error
 	h := new(encHandshake)
 	// generate random keypair for session
-	h.randomPrivKey, err = ecies.GenerateKey(rand.Reader, crypto.S256(), nil)
+	h.randomPrivKey, err = ecies.GenerateKey(rand.Reader, secp256k1.S256(), nil)
 	if err != nil {
 		return nil, err
 	}

p2p/rlpx_test.go

@@ -93,6 +93,7 @@ func testEncHandshake(token []byte) error {
 	go func() {
 		r := result{side: "initiator"}
 		defer func() { output <- r }()
+		defer fd0.Close()
 
 		dest := &discover.Node{ID: discover.PubkeyID(&prv1.PublicKey)}
 		r.id, r.err = c0.doEncHandshake(prv0, dest)
@@ -107,6 +108,7 @@ func testEncHandshake(token []byte) error {
 	go func() {
 		r := result{side: "receiver"}
 		defer func() { output <- r }()
+		defer fd1.Close()
 
 		r.id, r.err = c1.doEncHandshake(prv1, nil)
 		if r.err != nil {