update babyjub B8, clean unused funcs & errs in mimc7, small update in mimc7 tests

babyjub/babyjub.go

@@ -2,9 +2,10 @@ package babyjub
 
 import (
 	"fmt"
+	"math/big"
+
 	"github.com/iden3/go-iden3-crypto/constants"
 	"github.com/iden3/go-iden3-crypto/utils"
-	"math/big"
 )
 
 // A is one of the babyjub constants.
@@ -35,9 +36,9 @@ func init() {
 
 	B8 = NewPoint()
 	B8.X = utils.NewIntFromString(
-		"17777552123799933955779906779655732241715742912184938656739573121738514868268")
+		"5299619240641551281634865583518297030282874472190772894086521144482721001553")
 	B8.Y = utils.NewIntFromString(
-		"2626589144620713026669568689430873010625803728049924121243784502389097019475")
+		"16950150798460657717958625567821834550301663161624707787222815936182638968203")
 }
 
 // Point represents a point of the babyjub curve.
@@ -74,7 +75,7 @@ func (res *Point) Add(a *Point, b *Point) *Point {
 	x2.Mod(x2, constants.Q)
 	x2.ModInverse(x2, constants.Q) // x2 = (1 + D * a.x * b.x * a.y * b.y)^-1
 
-	// y = (a.y * b.y + A * a.x * a.x) * (1 - D * a.x * b.x * a.y * b.y)^-1 mod q
+	// y = (a.y * b.y - A * a.x * b.x) * (1 - D * a.x * b.x * a.y * b.y)^-1 mod q
 	y1a := new(big.Int).Mul(a.Y, b.Y)
 	y1b := new(big.Int).Set(A)
 	y1b.Mul(y1b, a.X)

babyjub/eddsa_test.go

@@ -37,21 +37,21 @@ func TestSignVerify1(t *testing.T) {
 
 	pk := k.Public()
 	assert.Equal(t,
-		"2610057752638682202795145288373380503107623443963127956230801721756904484787",
+		"13277427435165878497778222415993513565335242147425444199013288855685581939618",
 		pk.X.String())
 	assert.Equal(t,
-		"16617171478497210597712478520507818259149717466230047843969353176573634386897",
+		"13622229784656158136036771217484571176836296686641868549125388198837476602820",
 		pk.Y.String())
 
 	sig := k.SignMimc7(msg)
 	assert.Equal(t,
-		"4974729414807584049518234760796200867685098748448054182902488636762478901554",
+		"11384336176656855268977457483345535180380036354188103142384839473266348197733",
 		sig.R8.X.String())
 	assert.Equal(t,
-		"18714049394522540751536514815950425694461287643205706667341348804546050128733",
+		"15383486972088797283337779941324724402501462225528836549661220478783371668959",
 		sig.R8.Y.String())
 	assert.Equal(t,
-		"2171284143457722024136077617757713039502332290425057126942676527240038689549",
+		"2523202440825208709475937830811065542425109372212752003460238913256192595070",
 		sig.S.String())
 
 	ok := pk.VerifyMimc7(msg, sig)
@@ -62,8 +62,8 @@ func TestSignVerify1(t *testing.T) {
 	assert.Equal(t, nil, err)
 
 	assert.Equal(t, ""+
-		"5dfb6f843c023fe3e52548ccf22e55c81b426f7af81b4f51f7152f2fcfc65f29"+
-		"0dab19c5a0a75973cd75a54780de0c3a41ede6f57396fe99b5307fff3ce7cc04",
+		"dfedb4315d3f2eb4de2d3c510d7a987dcab67089c8ace06308827bf5bcbe02a2"+
+		"7ed40dab29bf993c928e789d007387998901a24913d44fddb64b1f21fc149405",
 		hex.EncodeToString(sigBuf[:]))
 
 	ok = pk.VerifyMimc7(msg, sig2)

mimc7/mimc7.go

@@ -26,9 +26,6 @@ type constantsData struct {
 	cts         []*big.Int
 }
 
-func getIV(seed string) {
-}
-
 func generateConstantsData() constantsData {
 	var constants constantsData
 
@@ -43,10 +40,7 @@ func generateConstantsData() constantsData {
 	constants.iv = new(big.Int).Mod(c, constants.maxFieldVal)
 
 	constants.nRounds = 91
-	cts, err := getConstants(constants.fqR, SEED, constants.nRounds)
-	if err != nil {
-		panic(err)
-	}
+	cts := getConstants(constants.fqR, SEED, constants.nRounds)
 	constants.cts = cts
 	return constants
 }
@@ -81,7 +75,7 @@ func RElemsToBigInts(arr []RElem) []*big.Int {
 	return o
 }
 
-func getConstants(fqR field.Fq, seed string, nRounds int) ([]*big.Int, error) {
+func getConstants(fqR field.Fq, seed string, nRounds int) []*big.Int {
 	cts := make([]*big.Int, nRounds)
 	cts[0] = big.NewInt(int64(0))
 	c := new(big.Int).SetBytes(crypto.Keccak256([]byte(SEED)))
@@ -91,15 +85,12 @@ func getConstants(fqR field.Fq, seed string, nRounds int) ([]*big.Int, error) {
 		n := fqR.Affine(c)
 		cts[i] = n
 	}
-	return cts, nil
+	return cts
 }
 
 // MIMC7HashGeneric performs the MIMC7 hash over a RElem, in a generic way, where it can be specified the Finite Field over R, and the number of rounds
-func MIMC7HashGeneric(fqR field.Fq, xIn, k *big.Int, nRounds int) (*big.Int, error) {
-	cts, err := getConstants(fqR, SEED, nRounds)
-	if err != nil {
-		return &big.Int{}, err
-	}
+func MIMC7HashGeneric(fqR field.Fq, xIn, k *big.Int, nRounds int) *big.Int {
+	cts := getConstants(fqR, SEED, nRounds)
 	var r *big.Int
 	for i := 0; i < nRounds; i++ {
 		var t *big.Int
@@ -112,7 +103,7 @@ func MIMC7HashGeneric(fqR field.Fq, xIn, k *big.Int, nRounds int) (*big.Int, err
 		t4 := fqR.Square(t2)
 		r = fqR.Mul(fqR.Mul(t4, t2), t)
 	}
-	return fqR.Affine(fqR.Add(r, k)), nil
+	return fqR.Affine(fqR.Add(r, k))
 }
 
 // HashGeneric performs the MIMC7 hash over a RElem array, in a generic way, where it can be specified the Finite Field over R, and the number of rounds
@@ -121,7 +112,7 @@ func HashGeneric(iv *big.Int, arrEl []RElem, fqR field.Fq, nRounds int) (RElem,
 	r := iv
 	var err error
 	for i := 0; i < len(arr); i++ {
-		r, err = MIMC7HashGeneric(fqR, r, arr[i], nRounds)
+		r = MIMC7HashGeneric(fqR, r, arr[i], nRounds)
 		if err != nil {
 			return r, err
 		}

mimc7/mimc7_test.go

@@ -5,6 +5,7 @@ import (
 	"math/big"
 	"testing"
 
+	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/iden3/go-iden3-crypto/field"
 	"github.com/stretchr/testify/assert"
 )
@@ -43,6 +44,13 @@ func TestUtils(t *testing.T) {
 	assert.Nil(t, err)
 }
 
+func TestKeccak256(t *testing.T) {
+	res := crypto.Keccak256([]byte(SEED))
+	assert.Equal(t, "b6e489e6b37224a50bebfddbe7d89fa8fdcaa84304a70bd13f79b5d9f7951e9e", hex.EncodeToString(res))
+	c := new(big.Int).SetBytes(crypto.Keccak256([]byte(SEED)))
+	assert.Equal(t, "82724731331859054037315113496710413141112897654334566532528783843265082629790", c.String())
+}
+
 func TestMIMC7Generic(t *testing.T) {
 	b1 := big.NewInt(int64(1))
 	b2 := big.NewInt(int64(2))
@@ -57,7 +65,7 @@ func TestMIMC7Generic(t *testing.T) {
 	assert.Nil(t, err)
 
 	// Generic Hash
-	mhg, err := MIMC7HashGeneric(fqR, b1, b2, 91)
+	mhg := MIMC7HashGeneric(fqR, b1, b2, 91)
 	assert.Nil(t, err)
 	assert.Equal(t, "10594780656576967754230020536574539122676596303354946869887184401991294982664", mhg.String())
 	hg, err := HashGeneric(fqR.Zero(), elementsArray, fqR, 91)
@@ -86,10 +94,6 @@ func TestMIMC7(t *testing.T) {
 	elementsArray2a, err := BigIntsToRElems(bigArray2a)
 	assert.Nil(t, err)
 
-	mh2a := MIMC7Hash(b12, b45)
-	assert.Nil(t, err)
-	assert.Equal(t, "0x"+hex.EncodeToString((*big.Int)(mh2a).Bytes()), "0x2ba7ebad3c6b6f5a20bdecba2333c63173ca1a5f2f49d958081d9fa7179c44e4")
-
 	h2a := Hash(elementsArray2a, nil)
 	assert.Nil(t, err)
 	// same hash value than the iden3js and circomlib tests: