Merge pull request #55 from lightningnetwork/btcec-v2

build: update to btcec/v2 and btcd/btcutil

.travis.yml

@@ -7,7 +7,7 @@ cache:
     - $GOPATH/src/github.com/golang
 
 go:
-  - "1.13.x"
+  - "1.17.x"
 
 sudo: required
 

bench_test.go

@@ -4,7 +4,7 @@ import (
 	"bytes"
 	"testing"
 
-	"github.com/btcsuite/btcd/btcec"
+	"github.com/btcsuite/btcd/btcec/v2"
 )
 
 var (
@@ -21,8 +21,8 @@ func BenchmarkPathPacketConstruction(b *testing.B) {
 		route        PaymentPath
 	)
 
-	for i := 0; i < NumMaxHops; i++ {
-		privKey, err := btcec.NewPrivateKey(btcec.S256())
+	for i := 0; i < 20; i++ {
+		privKey, err := btcec.NewPrivateKey()
 		if err != nil {
 			b.Fatalf("unable to generate key: %v", privKey)
 		}
@@ -44,7 +44,7 @@ func BenchmarkPathPacketConstruction(b *testing.B) {
 		}
 	}
 
-	d, _ := btcec.PrivKeyFromBytes(btcec.S256(), bytes.Repeat([]byte{'A'}, 32))
+	d, _ := btcec.PrivKeyFromBytes(bytes.Repeat([]byte{'A'}, 32))
 
 	b.ReportAllocs()
 

cmd/main.go

@@ -10,7 +10,7 @@ import (
 	"os"
 	"strings"
 
-	"github.com/btcsuite/btcd/btcec"
+	"github.com/btcsuite/btcd/btcec/v2"
 	"github.com/btcsuite/btcd/chaincfg"
 	sphinx "github.com/lightningnetwork/lightning-onion"
 )
@@ -44,15 +44,15 @@ func parseOnionSpec(spec OnionSpec) (*sphinx.PaymentPath, *btcec.PrivateKey, err
 		binSessionKey = bytes.Repeat([]byte{'A'}, 32)
 	}
 
-	sessionKey, _ := btcec.PrivKeyFromBytes(btcec.S256(), binSessionKey)
+	sessionKey, _ := btcec.PrivKeyFromBytes(binSessionKey)
 
 	for i, hop := range spec.Hops {
 		binKey, err := hex.DecodeString(hop.PublicKey)
 		if err != nil || len(binKey) != 33 {
 			log.Fatalf("%s is not a valid hex pubkey %s", hop.PublicKey, err)
 		}
 
-		pubkey, err := btcec.ParsePubKey(binKey, btcec.S256())
+		pubkey, err := btcec.ParsePubKey(binKey)
 		if err != nil {
 			log.Fatalf("%s is not a valid hex pubkey %s", hop.PublicKey, err)
 		}
@@ -132,7 +132,7 @@ func main() {
 			log.Fatalf("Error decoding message: %s", err)
 		}
 
-		privkey, _ := btcec.PrivKeyFromBytes(btcec.S256(), binKey)
+		privkey, _ := btcec.PrivKeyFromBytes(binKey)
 		privKeyECDH := &sphinx.PrivKeyECDH{PrivKey: privkey}
 		replayLog := sphinx.NewMemoryReplayLog()
 		s := sphinx.NewRouter(

crypto.go

@@ -8,7 +8,8 @@ import (
 	"fmt"
 
 	"github.com/aead/chacha20"
-	"github.com/btcsuite/btcd/btcec"
+	"github.com/btcsuite/btcd/btcec/v2"
+	secp "github.com/decred/dcrd/dcrec/secp256k1/v4"
 )
 
 const (
@@ -65,10 +66,16 @@ func (p *PrivKeyECDH) PubKey() *btcec.PublicKey {
 //
 // NOTE: This is part of the SingleKeyECDH interface.
 func (p *PrivKeyECDH) ECDH(pub *btcec.PublicKey) ([32]byte, error) {
-	s := &btcec.PublicKey{}
-	s.X, s.Y = btcec.S256().ScalarMult(pub.X, pub.Y, p.PrivKey.D.Bytes())
+	var pubJ btcec.JacobianPoint
+	pub.AsJacobian(&pubJ)
 
-	return sha256.Sum256(s.SerializeCompressed()), nil
+	var ecdhPoint btcec.JacobianPoint
+	btcec.ScalarMultNonConst(&p.PrivKey.Key, &pubJ, &ecdhPoint)
+
+	ecdhPoint.ToAffine()
+	ecdhPubKey := btcec.NewPublicKey(&ecdhPoint.X, &ecdhPoint.Y)
+
+	return sha256.Sum256(ecdhPubKey.SerializeCompressed()), nil
 }
 
 // DecryptedError contains the decrypted error message and its sender.
@@ -153,29 +160,43 @@ func generateCipherStream(key [keyLen]byte, numBytes uint) []byte {
 // sharedSecret for this hop. The blinding factor is computed as the
 // sha-256(pubkey || sharedSecret).
 func computeBlindingFactor(hopPubKey *btcec.PublicKey,
-	hopSharedSecret []byte) Hash256 {
+	hopSharedSecret []byte) btcec.ModNScalar {
 
 	sha := sha256.New()
 	sha.Write(hopPubKey.SerializeCompressed())
 	sha.Write(hopSharedSecret)
 
 	var hash Hash256
 	copy(hash[:], sha.Sum(nil))
-	return hash
+
+	var blindingBytes btcec.ModNScalar
+	blindingBytes.SetByteSlice(hash[:])
+
+	return blindingBytes
 }
 
 // blindGroupElement blinds the group element P by performing scalar
 // multiplication of the group element by blindingFactor: blindingFactor * P.
-func blindGroupElement(hopPubKey *btcec.PublicKey, blindingFactor []byte) *btcec.PublicKey {
-	newX, newY := btcec.S256().ScalarMult(hopPubKey.X, hopPubKey.Y, blindingFactor[:])
-	return &btcec.PublicKey{btcec.S256(), newX, newY}
+func blindGroupElement(hopPubKey *btcec.PublicKey, blindingFactor btcec.ModNScalar) *btcec.PublicKey {
+	var hopPubKeyJ btcec.JacobianPoint
+	hopPubKey.AsJacobian(&hopPubKeyJ)
+
+	var blindedPoint btcec.JacobianPoint
+	btcec.ScalarMultNonConst(
+		&blindingFactor, &hopPubKeyJ, &blindedPoint,
+	)
+	blindedPoint.ToAffine()
+
+	return btcec.NewPublicKey(&blindedPoint.X, &blindedPoint.Y)
 }
 
 // blindBaseElement blinds the groups's generator G by performing scalar base
 // multiplication using the blindingFactor: blindingFactor * G.
-func blindBaseElement(blindingFactor []byte) *btcec.PublicKey {
-	newX, newY := btcec.S256().ScalarBaseMult(blindingFactor)
-	return &btcec.PublicKey{btcec.S256(), newX, newY}
+func blindBaseElement(blindingFactor btcec.ModNScalar) *btcec.PublicKey {
+	// TODO(roasbeef): remove after btcec version bump to add alias for
+	// this method
+	priv := secp.NewPrivateKey(&blindingFactor)
+	return priv.PubKey()
 }
 
 // sharedSecretGenerator is an interface that abstracts away exactly *how* the
@@ -193,7 +214,7 @@ func (r *Router) generateSharedSecret(dhKey *btcec.PublicKey) (Hash256, error) {
 	var sharedSecret Hash256
 
 	// Ensure that the public key is on our curve.
-	if !btcec.S256().IsOnCurve(dhKey.X, dhKey.Y) {
+	if !dhKey.IsOnCurve() {
 		return sharedSecret, ErrInvalidOnionKey
 	}
 

go.mod

@@ -2,12 +2,13 @@ module github.com/lightningnetwork/lightning-onion
 
 require (
 	github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da
-	github.com/btcsuite/btcd v0.0.0-20190629003639-c26ffa870fd8
+	github.com/btcsuite/btcd v0.22.0-beta.0.20220207191057-4dc4ff7963b4
+	github.com/btcsuite/btcd/btcec/v2 v2.1.0
+	github.com/btcsuite/btcd/btcutil v1.1.0
 	github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f
-	github.com/btcsuite/btcutil v0.0.0-20190425235716-9e5f4b9a998d
 	github.com/davecgh/go-spew v1.1.1
-	golang.org/x/crypto v0.0.0-20190211182817-74369b46fc67
-	golang.org/x/sys v0.0.0-20190209173611-3b5209105503 // indirect
+	github.com/decred/dcrd/dcrec/secp256k1/v4 v4.0.1
+	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
 )
 
 go 1.13

go.sum

@@ -1,42 +1,93 @@
 github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da h1:KjTM2ks9d14ZYCvmHS9iAKVt9AyzRSqNU1qabPih5BY=
 github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da/go.mod h1:eHEWzANqSiWQsof+nXEI9bUVUyV6F53Fp89EuCh2EAA=
-github.com/aead/siphash v1.0.1 h1:FwHfE/T45KPKYuuSAKyyvE+oPWcaQ+CUmFW0bPlM+kg=
 github.com/aead/siphash v1.0.1/go.mod h1:Nywa3cDsYNNK3gaciGTWPwHt0wlpNV15vwmswBAUSII=
-github.com/btcsuite/btcd v0.0.0-20190629003639-c26ffa870fd8 h1:mOg8/RgDSHTQ1R0IR+LMDuW4TDShPv+JzYHuR4GLoNA=
-github.com/btcsuite/btcd v0.0.0-20190629003639-c26ffa870fd8/go.mod h1:3J08xEfcugPacsc34/LKRU2yO7YmuT8yt28J8k2+rrI=
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 github.com/btcsuite/btclog v0.0.0-20170628155309-84c8d2346e9f h1:bAs4lUbRJpnnkd9VhRV3jjAVU7DJVjMaK+IsvSeZvFo=
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+golang.org/x/sys v0.0.0-20200519105757-fe76b779f299/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200814200057-3d37ad5750ed h1:J22ig1FUekjjkmZUM7pTKixYm8DvrYsvrBZdunYeIuQ=
+golang.org/x/sys v0.0.0-20200814200057-3d37ad5750ed/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
+google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
+google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
+google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
+google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/fsnotify.v1 v1.4.7/go.mod h1:Tz8NjZHkW78fSQdbUxIjBTcgA1z1m8ZHf0WmKUhAMys=
 gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

hornet.go

@@ -1,7 +1,7 @@
 package sphinx
 
 import (
-	"github.com/btcsuite/btcd/btcec"
+	"github.com/btcsuite/btcd/btcec/v2"
 	"golang.org/x/crypto/ripemd160"
 )
 

obfuscation.go

@@ -3,7 +3,7 @@ package sphinx
 import (
 	"io"
 
-	"github.com/btcsuite/btcd/btcec"
+	"github.com/btcsuite/btcd/btcec/v2"
 )
 
 // OnionErrorEncrypter is a struct that's used to implement onion error
@@ -62,7 +62,7 @@ func (c *Circuit) Decode(r io.Reader) error {
 		return err
 	}
 
-	c.SessionKey, _ = btcec.PrivKeyFromBytes(btcec.S256(), sessionKeyData)
+	c.SessionKey, _ = btcec.PrivKeyFromBytes(sessionKeyData)
 	var pathLength [1]byte
 	if _, err := r.Read(pathLength[:]); err != nil {
 		return err
@@ -75,7 +75,7 @@ func (c *Circuit) Decode(r io.Reader) error {
 			return err
 		}
 
-		pubKey, err := btcec.ParsePubKey(pubKeyData[:], btcec.S256())
+		pubKey, err := btcec.ParsePubKey(pubKeyData[:])
 		if err != nil {
 			return err
 		}

obfuscation_test.go

@@ -7,7 +7,7 @@ import (
 	"reflect"
 	"testing"
 
-	"github.com/btcsuite/btcd/btcec"
+	"github.com/btcsuite/btcd/btcec/v2"
 )
 
 // TestOnionFailure checks the ability of sender of payment to decode the
@@ -16,14 +16,13 @@ func TestOnionFailure(t *testing.T) {
 	// Create numHops random sphinx paymentPath.
 	paymentPath := make([]*btcec.PublicKey, 5)
 	for i := 0; i < len(paymentPath); i++ {
-		privKey, err := btcec.NewPrivateKey(btcec.S256())
+		privKey, err := btcec.NewPrivateKey()
 		if err != nil {
 			t.Fatalf("unable to generate random key for sphinx node: %v", err)
 		}
 		paymentPath[i] = privKey.PubKey()
 	}
-	sessionKey, _ := btcec.PrivKeyFromBytes(btcec.S256(),
-		bytes.Repeat([]byte{'A'}, 32))
+	sessionKey, _ := btcec.PrivKeyFromBytes(bytes.Repeat([]byte{'A'}, 32))
 
 	// Reduce the error path on one node, in order to check that we are
 	// able to receive the error not only from last hop.
@@ -152,7 +151,7 @@ func getSpecPubKeys() ([]*btcec.PublicKey, error) {
 			return nil, err
 		}
 
-		key, err := btcec.ParsePubKey(bKey, btcec.S256())
+		key, err := btcec.ParsePubKey(bKey)
 		if err != nil {
 			return nil, err
 		}
@@ -168,7 +167,7 @@ func getSpecSessionKey() (*btcec.PrivateKey, error) {
 		return nil, err
 	}
 
-	privKey, _ := btcec.PrivKeyFromBytes(btcec.S256(), bKey)
+	privKey, _ := btcec.PrivKeyFromBytes(bKey)
 	return privKey, nil
 }
 
@@ -202,7 +201,6 @@ func TestOnionFailureSpecVector(t *testing.T) {
 		t.Fatalf("Unexpected error while generating secrets: %v", err)
 	}
 	for i, test := range onionErrorData {
-
 		// Decode the shared secret and check that it matchs with
 		// specification.
 		expectedSharedSecret, err := hex.DecodeString(test.sharedSecret)

packetfiller.go

@@ -4,7 +4,7 @@ import (
 	"crypto/rand"
 
 	"github.com/aead/chacha20"
-	"github.com/btcsuite/btcd/btcec"
+	"github.com/btcsuite/btcd/btcec/v2"
 )
 
 // PacketFiller is a function type to be specified by the caller to provide a