Rm .travis.yml

Poseidon & MiMC7 HashBytes remove return of err
Merge pull request #23 from iden3/feature/expose-method
2026-02-07 11:36:41 +01:00 · 2020-05-22 13:33:01 +02:00 · 2020-05-22 00:42:14 +02:00 · 2020-04-28 18:31:15 +02:00 · 2020-04-22 14:53:31 +02:00 · 2020-04-21 15:31:34 +02:00
19 changed files with 403 additions and 206 deletions
--- a/.github/workflows/lint.yml
+++ b/.github/workflows/lint.yml
@@ -0,0 +1,16 @@
+on: [ push, pull_request ]
+name: Lint
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Install Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: 1.14.x
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Lint
+      run: |
+        curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b $(go env GOPATH)/bin v1.24.0
+        $(go env GOPATH)/bin/golangci-lint run
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -0,0 +1,28 @@
+on: [ push, pull_request ]
+name: Test
+jobs:
+  test:
+    strategy:
+      matrix:
+        go-version: [ 1.13.x, 1.14.x ]
+        goarch: [ "amd64", "386" ]
+    runs-on: ubuntu-latest
+    steps:
+    - name: Install Go
+      uses: actions/setup-go@v1
+      with:
+        go-version: ${{ matrix.go-version }}
+      env:
+        GOARCH: ${{ matrix.goarch }}
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - uses: actions/cache@v1
+      with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+              ${{ runner.os }}-go-
+    - name: Test
+      env:
+        GOARCH: ${{ matrix.goarch }}
+      run: go test ./...
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,8 +0,0 @@
-dist: xenial
-language: go
-
-go:
-  - "1.12"
-
-env:
-  - GO111MODULE=on
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# go-iden3-crypto [![Go Report Card](https://goreportcard.com/badge/github.com/iden3/go-iden3-crypto)](https://goreportcard.com/report/github.com/iden3/go-iden3-crypto) [![Build Status](https://travis-ci.org/iden3/go-iden3-crypto.svg?branch=master)](https://travis-ci.org/iden3/go-iden3-crypto) [![GoDoc](https://godoc.org/github.com/iden3/go-iden3-crypto?status.svg)](https://godoc.org/github.com/iden3/go-iden3-crypto)
+# go-iden3-crypto [![Go Report Card](https://goreportcard.com/badge/github.com/iden3/go-iden3-crypto)](https://goreportcard.com/report/github.com/iden3/go-iden3-crypto) [![Test Status](https://github.com/iden3/go-iden3-crypto/workflows/Test/badge.svg)](https://github.com/iden3/go-iden3-crypto/actions?query=workflow%3ATest) [![Lint Status](https://github.com/iden3/go-iden3-crypto/workflows/Lint/badge.svg)](https://github.com/iden3/go-iden3-crypto/actions?query=workflow%3ALint) [![GoDoc](https://godoc.org/github.com/iden3/go-iden3-crypto?status.svg)](https://godoc.org/github.com/iden3/go-iden3-crypto)

 Go implementation of some cryptographic primitives (that fit inside the SNARK field) used in iden3

--- a/babyjub/babyjub.go
+++ b/babyjub/babyjub.go
@@ -5,15 +5,14 @@ import (
 	"math/big"

 	"github.com/iden3/go-iden3-crypto/constants"
-	"github.com/iden3/go-iden3-crypto/ff"
 	"github.com/iden3/go-iden3-crypto/utils"
 )

 // A is one of the babyjub constants.
-var A *ff.Element
+var A *big.Int

 // D is one of the babyjub constants.
-var D *ff.Element
+var D *big.Int

 // Order of the babyjub curve.
 var Order *big.Int
@@ -28,52 +27,29 @@ var B8 *Point

 // init initializes global numbers and the subgroup base.
 func init() {
-	A = ff.NewElement().SetString("168700")
-	D = ff.NewElement().SetString("168696")
+	A = utils.NewIntFromString("168700")
+	D = utils.NewIntFromString("168696")

 	Order = utils.NewIntFromString(
 		"21888242871839275222246405745257275088614511777268538073601725287587578984328")
 	SubOrder = new(big.Int).Rsh(Order, 3)

 	B8 = NewPoint()
-	B8.X = ff.NewElement().SetString(
+	B8.X = utils.NewIntFromString(
 		"5299619240641551281634865583518297030282874472190772894086521144482721001553")
-	B8.Y = ff.NewElement().SetString(
+	B8.Y = utils.NewIntFromString(
 		"16950150798460657717958625567821834550301663161624707787222815936182638968203")
 }

-// PointBI represents a point of the babyjub curve.
-type PointBI struct {
+// Point represents a point of the babyjub curve.
+type Point struct {
 	X *big.Int
 	Y *big.Int
 }

-type Point struct {
-	X *ff.Element
-	Y *ff.Element
-}
-
-func PointBIToPoint(p *PointBI) *Point {
-	return &Point{
-		X: ff.NewElement().SetBigInt(p.X),
-		Y: ff.NewElement().SetBigInt(p.Y),
-	}
-}
-
-func PointToPointBI(p *Point) *PointBI {
-	return &PointBI{
-		X: p.X.BigInt(),
-		Y: p.Y.BigInt(),
-	}
-}
-
-// NewPoint creates a new PointBI.
-func NewPointBI() *PointBI {
-	return &PointBI{X: big.NewInt(0), Y: big.NewInt(1)}
-}
-
+// NewPoint creates a new Point.
 func NewPoint() *Point {
-	return &Point{X: ff.NewElement().SetZero(), Y: ff.NewElement().SetOne()}
+	return &Point{X: big.NewInt(0), Y: big.NewInt(1)}
 }

 // Set copies a Point c into the Point p
@@ -83,45 +59,44 @@ func (p *Point) Set(c *Point) *Point {
 	return p
 }

-func (p *Point) Equal(q *Point) bool {
-	// return p.X.Cmp(q.X) == 0 && p.Y.Cmp(q.Y) == 0
-	return p.X.Equal(q.X) && p.Y.Equal(q.Y)
-}
-
 // Add adds Point a and b into res
 func (res *Point) Add(a *Point, b *Point) *Point {
 	// x = (a.x * b.y + b.x * a.y) * (1 + D * a.x * b.x * a.y * b.y)^-1 mod q
-	x1a := ff.NewElement().Mul(a.X, b.Y)
-	x1b := ff.NewElement().Mul(b.X, a.Y)
+	x1a := new(big.Int).Mul(a.X, b.Y)
+	x1b := new(big.Int).Mul(b.X, a.Y)
 	x1a.Add(x1a, x1b) // x1a = a.x * b.y + b.x * a.y

-	x2 := ff.NewElement().Set(D)
+	x2 := new(big.Int).Set(D)
 	x2.Mul(x2, a.X)
 	x2.Mul(x2, b.X)
 	x2.Mul(x2, a.Y)
 	x2.Mul(x2, b.Y)
-	x2.Add(ff.NewElement().SetOne(), x2)
-	x2.Inverse(x2) // x2 = (1 + D * a.x * b.x * a.y * b.y)^-1
+	x2.Add(constants.One, x2)
+	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 * b.x) * (1 - D * a.x * b.x * a.y * b.y)^-1 mod q
-	y1a := ff.NewElement().Mul(a.Y, b.Y)
-	y1b := ff.NewElement().Set(A)
+	y1a := new(big.Int).Mul(a.Y, b.Y)
+	y1b := new(big.Int).Set(A)
 	y1b.Mul(y1b, a.X)
 	y1b.Mul(y1b, b.X)

 	y1a.Sub(y1a, y1b) // y1a = a.y * b.y - A * a.x * b.x

-	y2 := ff.NewElement().Set(D)
+	y2 := new(big.Int).Set(D)
 	y2.Mul(y2, a.X)
 	y2.Mul(y2, b.X)
 	y2.Mul(y2, a.Y)
 	y2.Mul(y2, b.Y)
-	y2.Sub(ff.NewElement().SetOne(), y2)
-	y2.Inverse(y2) // y2 = (1 - D * a.x * b.x * a.y * b.y)^-1
+	y2.Sub(constants.One, y2)
+	y2.Mod(y2, constants.Q)
+	y2.ModInverse(y2, constants.Q) // y2 = (1 - D * a.x * b.x * a.y * b.y)^-1

 	res.X = x1a.Mul(x1a, x2)
+	res.X = res.X.Mod(res.X, constants.Q)

 	res.Y = y1a.Mul(y1a, y2)
+	res.Y = res.Y.Mod(res.Y, constants.Q)

 	return res
 }
@@ -129,8 +104,8 @@ func (res *Point) Add(a *Point, b *Point) *Point {
 // Mul multiplies the Point p by the scalar s and stores the result in res,
 // which is also returned.
 func (res *Point) Mul(s *big.Int, p *Point) *Point {
-	res.X = ff.NewElement().SetZero()
-	res.Y = ff.NewElement().SetOne()
+	res.X = big.NewInt(0)
+	res.Y = big.NewInt(1)
 	exp := NewPoint().Set(p)

 	for i := 0; i < s.BitLen(); i++ {
@@ -145,21 +120,25 @@ func (res *Point) Mul(s *big.Int, p *Point) *Point {

 // InCurve returns true when the Point p is in the babyjub curve.
 func (p *Point) InCurve() bool {
-	x2 := ff.NewElement().Set(p.X)
+	x2 := new(big.Int).Set(p.X)
 	x2.Mul(x2, x2)
+	x2.Mod(x2, constants.Q)

-	y2 := ff.NewElement().Set(p.Y)
+	y2 := new(big.Int).Set(p.Y)
 	y2.Mul(y2, y2)
+	y2.Mod(y2, constants.Q)

-	a := ff.NewElement().Mul(A, x2)
+	a := new(big.Int).Mul(A, x2)
 	a.Add(a, y2)
+	a.Mod(a, constants.Q)

-	b := ff.NewElement().Set(D)
+	b := new(big.Int).Set(D)
 	b.Mul(b, x2)
 	b.Mul(b, y2)
-	b.Add(ff.NewElement().SetOne(), b)
+	b.Add(constants.One, b)
+	b.Mod(b, constants.Q)

-	return a.Equal(b)
+	return a.Cmp(b) == 0
 }

 // InSubGroup returns true when the Point p is in the subgroup of the babyjub
@@ -169,16 +148,13 @@ func (p *Point) InSubGroup() bool {
 		return false
 	}
 	res := NewPoint().Mul(SubOrder, p)
-	return res.X.Equal(ff.NewElement().SetZero()) && res.Y.Equal(ff.NewElement().SetOne())
+	return (res.X.Cmp(constants.Zero) == 0) && (res.Y.Cmp(constants.One) == 0)
 }

 // PointCoordSign returns the sign of the curve point coordinate.  It returns
 // false if the sign is positive and false if the sign is negative.
 func PointCoordSign(c *big.Int) bool {
-	if c.Cmp(new(big.Int).Rsh(constants.Q, 1)) == 1 {
-		return true
-	}
-	return false
+	return c.Cmp(new(big.Int).Rsh(constants.Q, 1)) == 1
 }

 func PackPoint(ay *big.Int, sign bool) [32]byte {
@@ -192,9 +168,8 @@ func PackPoint(ay *big.Int, sign bool) [32]byte {
 // Compress the point into a 32 byte array that contains the y coordinate in
 // little endian and the sign of the x coordinate.
 func (p *Point) Compress() [32]byte {
-	pBI := PointToPointBI(p)
-	sign := PointCoordSign(pBI.X)
-	return PackPoint(pBI.Y, sign)
+	sign := PointCoordSign(p.X)
+	return PackPoint(p.Y, sign)
 }

 // Decompress a compressed Point into p, and also returns the decompressed
@@ -205,37 +180,34 @@ func (p *Point) Decompress(leBuf [32]byte) (*Point, error) {
 		sign = true
 		leBuf[31] = leBuf[31] & 0x7F
 	}
-	y := big.NewInt(0)
-	utils.SetBigIntFromLEBytes(y, leBuf[:])
-	if y.Cmp(constants.Q) >= 0 {
+	utils.SetBigIntFromLEBytes(p.Y, leBuf[:])
+	if p.Y.Cmp(constants.Q) >= 0 {
 		return nil, fmt.Errorf("p.y >= Q")
 	}
-	p.Y = ff.NewElement().SetBigInt(y)

-	y2 := ff.NewElement().Mul(p.Y, p.Y)
-	xa := ff.NewElement().SetOne()
+	y2 := new(big.Int).Mul(p.Y, p.Y)
+	y2.Mod(y2, constants.Q)
+	xa := big.NewInt(1)
 	xa.Sub(xa, y2) // xa == 1 - y^2

-	xb := ff.NewElement().Mul(D, y2)
+	xb := new(big.Int).Mul(D, y2)
+	xb.Mod(xb, constants.Q)
 	xb.Sub(A, xb) // xb = A - d * y^2

-	if xb.Equal(ff.NewElement().SetZero()) {
+	if xb.Cmp(big.NewInt(0)) == 0 {
 		return nil, fmt.Errorf("division by 0")
 	}
-	xb.Inverse(xb)
+	xb.ModInverse(xb, constants.Q)
 	p.X.Mul(xa, xb) // xa / xb
-
-	q := PointToPointBI(p)
-	noSqrt := q.X.ModSqrt(q.X, constants.Q)
+	p.X.Mod(p.X, constants.Q)
+	noSqrt := p.X.ModSqrt(p.X, constants.Q)
 	if noSqrt == nil {
 		return nil, fmt.Errorf("x is not a square mod q")
 	}
-	if (sign && !PointCoordSign(q.X)) || (!sign && PointCoordSign(q.X)) {
-		q.X.Mul(q.X, constants.MinusOne)
+	if (sign && !PointCoordSign(p.X)) || (!sign && PointCoordSign(p.X)) {
+		p.X.Mul(p.X, constants.MinusOne)
 	}
-	q.X.Mod(q.X, constants.Q)
-
-	p = PointBIToPoint(q)
+	p.X.Mod(p.X, constants.Q)

 	return p, nil
 }
--- a/babyjub/babyjub_test.go
+++ b/babyjub/babyjub_test.go
@@ -7,21 +7,13 @@ import (
 	"testing"

 	"github.com/iden3/go-iden3-crypto/constants"
-	"github.com/iden3/go-iden3-crypto/ff"
 	"github.com/iden3/go-iden3-crypto/utils"
 	"github.com/stretchr/testify/assert"
 )

-func zero() *ff.Element {
-	return ff.NewElement().SetZero()
-}
-func one() *ff.Element {
-	return ff.NewElement().SetOne()
-}
-
 func TestAdd1(t *testing.T) {
-	a := &Point{X: zero(), Y: one()}
-	b := &Point{X: zero(), Y: one()}
+	a := &Point{X: big.NewInt(0), Y: big.NewInt(1)}
+	b := &Point{X: big.NewInt(0), Y: big.NewInt(1)}

 	c := NewPoint().Add(a, b)
 	// fmt.Printf("%v = 2 * %v", *c, *a)
@@ -30,15 +22,15 @@ func TestAdd1(t *testing.T) {
 }

 func TestAdd2(t *testing.T) {
-	aX := ff.NewElement().SetString(
+	aX := utils.NewIntFromString(
 		"17777552123799933955779906779655732241715742912184938656739573121738514868268")
-	aY := ff.NewElement().SetString(
+	aY := utils.NewIntFromString(
 		"2626589144620713026669568689430873010625803728049924121243784502389097019475")
 	a := &Point{X: aX, Y: aY}

-	bX := ff.NewElement().SetString(
+	bX := utils.NewIntFromString(
 		"17777552123799933955779906779655732241715742912184938656739573121738514868268")
-	bY := ff.NewElement().SetString(
+	bY := utils.NewIntFromString(
 		"2626589144620713026669568689430873010625803728049924121243784502389097019475")
 	b := &Point{X: bX, Y: bY}

@@ -53,15 +45,15 @@ func TestAdd2(t *testing.T) {
 }

 func TestAdd3(t *testing.T) {
-	aX := ff.NewElement().SetString(
+	aX := utils.NewIntFromString(
 		"17777552123799933955779906779655732241715742912184938656739573121738514868268")
-	aY := ff.NewElement().SetString(
+	aY := utils.NewIntFromString(
 		"2626589144620713026669568689430873010625803728049924121243784502389097019475")
 	a := &Point{X: aX, Y: aY}

-	bX := ff.NewElement().SetString(
+	bX := utils.NewIntFromString(
 		"16540640123574156134436876038791482806971768689494387082833631921987005038935")
-	bY := ff.NewElement().SetString(
+	bY := utils.NewIntFromString(
 		"20819045374670962167435360035096875258406992893633759881276124905556507972311")
 	b := &Point{X: bX, Y: bY}

@@ -76,15 +68,15 @@ func TestAdd3(t *testing.T) {
 }

 func TestAdd4(t *testing.T) {
-	aX := ff.NewElement().SetString(
+	aX := utils.NewIntFromString(
 		"0")
-	aY := ff.NewElement().SetString(
+	aY := utils.NewIntFromString(
 		"1")
 	a := &Point{X: aX, Y: aY}

-	bX := ff.NewElement().SetString(
+	bX := utils.NewIntFromString(
 		"16540640123574156134436876038791482806971768689494387082833631921987005038935")
-	bY := ff.NewElement().SetString(
+	bY := utils.NewIntFromString(
 		"20819045374670962167435360035096875258406992893633759881276124905556507972311")
 	b := &Point{X: bX, Y: bY}

@@ -99,19 +91,19 @@ func TestAdd4(t *testing.T) {
 }

 func TestInCurve1(t *testing.T) {
-	p := &Point{X: zero(), Y: one()}
+	p := &Point{X: big.NewInt(0), Y: big.NewInt(1)}
 	assert.Equal(t, true, p.InCurve())
 }

 func TestInCurve2(t *testing.T) {
-	p := &Point{X: one(), Y: zero()}
+	p := &Point{X: big.NewInt(1), Y: big.NewInt(0)}
 	assert.Equal(t, false, p.InCurve())
 }

 func TestMul0(t *testing.T) {
-	x := ff.NewElement().SetString(
+	x := utils.NewIntFromString(
 		"17777552123799933955779906779655732241715742912184938656739573121738514868268")
-	y := ff.NewElement().SetString(
+	y := utils.NewIntFromString(
 		"2626589144620713026669568689430873010625803728049924121243784502389097019475")
 	p := &Point{X: x, Y: y}
 	s := utils.NewIntFromString("3")
@@ -131,9 +123,9 @@ func TestMul0(t *testing.T) {
 }

 func TestMul1(t *testing.T) {
-	x := ff.NewElement().SetString(
+	x := utils.NewIntFromString(
 		"17777552123799933955779906779655732241715742912184938656739573121738514868268")
-	y := ff.NewElement().SetString(
+	y := utils.NewIntFromString(
 		"2626589144620713026669568689430873010625803728049924121243784502389097019475")
 	p := &Point{X: x, Y: y}
 	s := utils.NewIntFromString(
@@ -148,9 +140,9 @@ func TestMul1(t *testing.T) {
 }

 func TestMul2(t *testing.T) {
-	x := ff.NewElement().SetString(
+	x := utils.NewIntFromString(
 		"6890855772600357754907169075114257697580319025794532037257385534741338397365")
-	y := ff.NewElement().SetString(
+	y := utils.NewIntFromString(
 		"4338620300185947561074059802482547481416142213883829469920100239455078257889")
 	p := &Point{X: x, Y: y}
 	s := utils.NewIntFromString(
@@ -165,45 +157,45 @@ func TestMul2(t *testing.T) {
 }

 func TestInCurve3(t *testing.T) {
-	x := ff.NewElement().SetString(
+	x := utils.NewIntFromString(
 		"17777552123799933955779906779655732241715742912184938656739573121738514868268")
-	y := ff.NewElement().SetString(
+	y := utils.NewIntFromString(
 		"2626589144620713026669568689430873010625803728049924121243784502389097019475")
 	p := &Point{X: x, Y: y}
 	assert.Equal(t, true, p.InCurve())
 }

 func TestInCurve4(t *testing.T) {
-	x := ff.NewElement().SetString(
+	x := utils.NewIntFromString(
 		"6890855772600357754907169075114257697580319025794532037257385534741338397365")
-	y := ff.NewElement().SetString(
+	y := utils.NewIntFromString(
 		"4338620300185947561074059802482547481416142213883829469920100239455078257889")
 	p := &Point{X: x, Y: y}
 	assert.Equal(t, true, p.InCurve())
 }

 func TestInSubGroup1(t *testing.T) {
-	x := ff.NewElement().SetString(
+	x := utils.NewIntFromString(
 		"17777552123799933955779906779655732241715742912184938656739573121738514868268")
-	y := ff.NewElement().SetString(
+	y := utils.NewIntFromString(
 		"2626589144620713026669568689430873010625803728049924121243784502389097019475")
 	p := &Point{X: x, Y: y}
 	assert.Equal(t, true, p.InSubGroup())
 }

 func TestInSubGroup2(t *testing.T) {
-	x := ff.NewElement().SetString(
+	x := utils.NewIntFromString(
 		"6890855772600357754907169075114257697580319025794532037257385534741338397365")
-	y := ff.NewElement().SetString(
+	y := utils.NewIntFromString(
 		"4338620300185947561074059802482547481416142213883829469920100239455078257889")
 	p := &Point{X: x, Y: y}
 	assert.Equal(t, true, p.InSubGroup())
 }

 func TestCompressDecompress1(t *testing.T) {
-	x := ff.NewElement().SetString(
+	x := utils.NewIntFromString(
 		"17777552123799933955779906779655732241715742912184938656739573121738514868268")
-	y := ff.NewElement().SetString(
+	y := utils.NewIntFromString(
 		"2626589144620713026669568689430873010625803728049924121243784502389097019475")
 	p := &Point{X: x, Y: y}

@@ -217,9 +209,9 @@ func TestCompressDecompress1(t *testing.T) {
 }

 func TestCompressDecompress2(t *testing.T) {
-	x := ff.NewElement().SetString(
+	x := utils.NewIntFromString(
 		"6890855772600357754907169075114257697580319025794532037257385534741338397365")
-	y := ff.NewElement().SetString(
+	y := utils.NewIntFromString(
 		"4338620300185947561074059802482547481416142213883829469920100239455078257889")
 	p := &Point{X: x, Y: y}

@@ -238,8 +230,7 @@ func TestCompressDecompressRnd(t *testing.T) {
 		buf := p1.Compress()
 		p2, err := NewPoint().Decompress(buf)
 		assert.Equal(t, nil, err)
-		// assert.Equal(t, p1, p2)
-		assert.True(t, p1.Equal(p2))
+		assert.Equal(t, p1, p2)
 	}
 }

@@ -250,15 +241,15 @@ func BenchmarkBabyjub(b *testing.B) {

 	var badpoints [n]*Point
 	for i := 0; i < n; i++ {
-		x := ff.NewElement().SetRandom()
-		y := ff.NewElement().SetRandom()
+		x := new(big.Int).Rand(rnd, constants.Q)
+		y := new(big.Int).Rand(rnd, constants.Q)
 		badpoints[i] = &Point{X: x, Y: y}
 	}

 	var points [n]*Point
-	baseX := ff.NewElement().SetString(
+	baseX := utils.NewIntFromString(
 		"17777552123799933955779906779655732241715742912184938656739573121738514868268")
-	baseY := ff.NewElement().SetString(
+	baseY := utils.NewIntFromString(
 		"2626589144620713026669568689430873010625803728049924121243784502389097019475")
 	base := &Point{X: baseX, Y: baseY}
 	for i := 0; i < n; i++ {
@@ -272,8 +263,8 @@ func BenchmarkBabyjub(b *testing.B) {
 	}

 	b.Run("AddConst", func(b *testing.B) {
-		p0 := &Point{X: zero(), Y: one()}
-		p1 := &Point{X: zero(), Y: one()}
+		p0 := &Point{X: big.NewInt(0), Y: big.NewInt(1)}
+		p1 := &Point{X: big.NewInt(0), Y: big.NewInt(1)}

 		p2 := NewPoint()
 		for i := 0; i < b.N; i++ {
--- a/babyjub/eddsa.go
+++ b/babyjub/eddsa.go
@@ -36,6 +36,13 @@ func NewRandPrivKey() PrivateKey {
 // Scalar converts a private key into the scalar value s following the EdDSA
 // standard, and using blake-512 hash.
 func (k *PrivateKey) Scalar() *PrivKeyScalar {
+	s := SkToBigInt(k)
+	return NewPrivKeyScalar(s)
+}
+
+// SkToBigInt converts a private key into the *big.Int value following the
+// EdDSA standard, and using blake-512 hash
+func SkToBigInt(k *PrivateKey) *big.Int {
 	sBuf := Blake512(k[:])
 	sBuf32 := [32]byte{}
 	copy(sBuf32[:], sBuf[:32])
@@ -43,7 +50,7 @@ func (k *PrivateKey) Scalar() *PrivKeyScalar {
 	s := new(big.Int)
 	utils.SetBigIntFromLEBytes(s, sBuf32[:])
 	s.Rsh(s, 3)
-	return NewPrivKeyScalar(s)
+	return s
 }

 // Pub returns the public key corresponding to a private key.
@@ -180,7 +187,7 @@ func (k *PrivateKey) SignMimc7(msg *big.Int) *Signature {
 	r.Mod(r, SubOrder)
 	R8 := NewPoint().Mul(r, B8) // R8 = r * 8 * B
 	A := k.Public().Point()
-	hmInput := []*big.Int{R8.X.BigInt(), R8.Y.BigInt(), A.X.BigInt(), A.Y.BigInt(), msg}
+	hmInput := []*big.Int{R8.X, R8.Y, A.X, A.Y, msg}
 	hm, err := mimc7.Hash(hmInput, nil) // hm = H1(8*R.x, 8*R.y, A.x, A.y, msg)
 	if err != nil {
 		panic(err)
@@ -196,7 +203,7 @@ func (k *PrivateKey) SignMimc7(msg *big.Int) *Signature {
 // VerifyMimc7 verifies the signature of a message encoded as a big.Int in Zq
 // using blake-512 hash for buffer hashing and mimc7 for big.Int hashing.
 func (p *PublicKey) VerifyMimc7(msg *big.Int, sig *Signature) bool {
-	hmInput := []*big.Int{sig.R8.X.BigInt(), sig.R8.Y.BigInt(), p.X.BigInt(), p.Y.BigInt(), msg}
+	hmInput := []*big.Int{sig.R8.X, sig.R8.Y, p.X, p.Y, msg}
 	hm, err := mimc7.Hash(hmInput, nil) // hm = H1(8*R.x, 8*R.y, A.x, A.y, msg)
 	if err != nil {
 		panic(err)
@@ -207,7 +214,7 @@ func (p *PublicKey) VerifyMimc7(msg *big.Int, sig *Signature) bool {
 	r1.Mul(r1, hm)
 	right := NewPoint().Mul(r1, p.Point())
 	right.Add(sig.R8, right) // right = 8 * R + 8 * hm * A
-	return left.X.Equal(right.X) && left.Y.Equal(right.Y)
+	return (left.X.Cmp(right.X) == 0) && (left.Y.Cmp(right.Y) == 0)
 }

 // SignPoseidon signs a message encoded as a big.Int in Zq using blake-512 hash
@@ -223,7 +230,7 @@ func (k *PrivateKey) SignPoseidon(msg *big.Int) *Signature {
 	R8 := NewPoint().Mul(r, B8) // R8 = r * 8 * B
 	A := k.Public().Point()

-	hmInput := [poseidon.T]*big.Int{R8.X.BigInt(), R8.Y.BigInt(), A.X.BigInt(), A.Y.BigInt(), msg, big.NewInt(int64(0))}
+	hmInput := [poseidon.T]*big.Int{R8.X, R8.Y, A.X, A.Y, msg, big.NewInt(int64(0))}
 	hm, err := poseidon.PoseidonHash(hmInput) // hm = H1(8*R.x, 8*R.y, A.x, A.y, msg)
 	if err != nil {
 		panic(err)
@@ -240,7 +247,7 @@ func (k *PrivateKey) SignPoseidon(msg *big.Int) *Signature {
 // VerifyPoseidon verifies the signature of a message encoded as a big.Int in Zq
 // using blake-512 hash for buffer hashing and Poseidon for big.Int hashing.
 func (p *PublicKey) VerifyPoseidon(msg *big.Int, sig *Signature) bool {
-	hmInput := [poseidon.T]*big.Int{sig.R8.X.BigInt(), sig.R8.Y.BigInt(), p.X.BigInt(), p.Y.BigInt(), msg, big.NewInt(int64(0))}
+	hmInput := [poseidon.T]*big.Int{sig.R8.X, sig.R8.Y, p.X, p.Y, msg, big.NewInt(int64(0))}
 	hm, err := poseidon.PoseidonHash(hmInput) // hm = H1(8*R.x, 8*R.y, A.x, A.y, msg)
 	if err != nil {
 		panic(err)
@@ -251,5 +258,5 @@ func (p *PublicKey) VerifyPoseidon(msg *big.Int, sig *Signature) bool {
 	r1.Mul(r1, hm)
 	right := NewPoint().Mul(r1, p.Point())
 	right.Add(sig.R8, right) // right = 8 * R + 8 * hm * A
-	return left.X.Equal(right.X) && left.Y.Equal(right.Y)
+	return (left.X.Cmp(right.X) == 0) && (left.Y.Cmp(right.Y) == 0)
 }
--- a/babyjub/eddsa_test.go
+++ b/babyjub/eddsa_test.go
@@ -1,7 +1,6 @@
 package babyjub

 import (
-	"crypto/rand"
 	"encoding/hex"
 	"fmt"
 	"math/big"
@@ -10,34 +9,23 @@ import (
 	"github.com/iden3/go-iden3-crypto/constants"
 	"github.com/iden3/go-iden3-crypto/utils"
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )

-func genInputs() (*PrivateKey, *big.Int) {
-	k := NewRandPrivKey()
-	fmt.Println("k", hex.EncodeToString(k[:]))
-
-	msgBuf := [32]byte{}
-	rand.Read(msgBuf[:])
-	msg := utils.SetBigIntFromLEBytes(new(big.Int), msgBuf[:])
-	msg.Mod(msg, constants.Q)
-	fmt.Println("msg", msg)
-
-	return &k, msg
-}
-
 func TestPublicKey(t *testing.T) {
 	var k PrivateKey
-	for i := 0; i < 256; i++ {
-		hex.Decode(k[:], []byte{byte(i)})
+	for i := 0; i < 32; i++ {
+		k[i] = byte(i)
 	}
 	pk := k.Public()
-	assert.True(t, pk.X.BigInt().Cmp(constants.Q) == -1)
-	assert.True(t, pk.Y.BigInt().Cmp(constants.Q) == -1)
+	assert.True(t, pk.X.Cmp(constants.Q) == -1)
+	assert.True(t, pk.Y.Cmp(constants.Q) == -1)
 }

 func TestSignVerifyMimc7(t *testing.T) {
 	var k PrivateKey
-	hex.Decode(k[:], []byte("0001020304050607080900010203040506070809000102030405060708090001"))
+	_, err := hex.Decode(k[:], []byte("0001020304050607080900010203040506070809000102030405060708090001"))
+	require.Nil(t, err)
 	msgBuf, err := hex.DecodeString("00010203040506070809")
 	if err != nil {
 		panic(err)
@@ -81,7 +69,8 @@ func TestSignVerifyMimc7(t *testing.T) {

 func TestSignVerifyPoseidon(t *testing.T) {
 	var k PrivateKey
-	hex.Decode(k[:], []byte("0001020304050607080900010203040506070809000102030405060708090001"))
+	_, err := hex.Decode(k[:], []byte("0001020304050607080900010203040506070809000102030405060708090001"))
+	require.Nil(t, err)
 	msgBuf, err := hex.DecodeString("00010203040506070809")
 	if err != nil {
 		panic(err)
@@ -125,7 +114,8 @@ func TestSignVerifyPoseidon(t *testing.T) {

 func TestCompressDecompress(t *testing.T) {
 	var k PrivateKey
-	hex.Decode(k[:], []byte("0001020304050607080900010203040506070809000102030405060708090001"))
+	_, err := hex.Decode(k[:], []byte("0001020304050607080900010203040506070809000102030405060708090001"))
+	require.Nil(t, err)
 	pk := k.Public()
 	for i := 0; i < 64; i++ {
 		msgBuf, err := hex.DecodeString(fmt.Sprintf("000102030405060708%02d", i))
@@ -144,7 +134,8 @@ func TestCompressDecompress(t *testing.T) {

 func BenchmarkBabyjubEddsa(b *testing.B) {
 	var k PrivateKey
-	hex.Decode(k[:], []byte("0001020304050607080900010203040506070809000102030405060708090001"))
+	_, err := hex.Decode(k[:], []byte("0001020304050607080900010203040506070809000102030405060708090001"))
+	require.Nil(b, err)
 	pk := k.Public()

 	const n = 256
--- a/babyjub/helpers.go
+++ b/babyjub/helpers.go
@@ -8,6 +8,9 @@ import (
 // the original blake from the SHA3 competition and not the new blake2 version.
 func Blake512(m []byte) []byte {
 	h := blake512.New()
-	h.Write(m[:])
+	_, err := h.Write(m[:])
+	if err != nil {
+		panic(err)
+	}
 	return h.Sum(nil)
 }
--- a/ff/element.go
+++ b/ff/element.go
@@ -513,15 +513,33 @@ func (z *Element) String() string {

 // ToBigInt returns z as a big.Int in Montgomery form
 func (z *Element) ToBigInt(res *big.Int) *big.Int {
+	if bits.UintSize == 64 {
 		bits := (*[4]big.Word)(unsafe.Pointer(z))
 		return res.SetBits(bits[:])
+	} else {
+		var bits [8]big.Word
+		for i := 0; i < len(z); i++ {
+			bits[i*2] = big.Word(z[i])
+			bits[i*2+1] = big.Word(z[i] >> 32)
+		}
+		return res.SetBits(bits[:])
+	}
 }

 // ToBigIntRegular returns z as a big.Int in regular form
 func (z Element) ToBigIntRegular(res *big.Int) *big.Int {
 	z.FromMont()
+	if bits.UintSize == 64 {
 		bits := (*[4]big.Word)(unsafe.Pointer(&z))
 		return res.SetBits(bits[:])
+	} else {
+		var bits [8]big.Word
+		for i := 0; i < len(z); i++ {
+			bits[i*2] = big.Word(z[i])
+			bits[i*2+1] = big.Word(z[i] >> 32)
+		}
+		return res.SetBits(bits[:])
+	}
 }

 // SetBigInt sets z to v (regular form) and returns z in Montgomery form
@@ -548,9 +566,19 @@ func (z *Element) SetBigInt(v *big.Int) *Element {
 	}
 	// v should
 	vBits := vv.Bits()
+	if bits.UintSize == 64 {
 		for i := 0; i < len(vBits); i++ {
 			z[i] = uint64(vBits[i])
 		}
+	} else {
+		for i := 0; i < len(vBits); i++ {
+			if i%2 == 0 {
+				z[i/2] = uint64(vBits[i])
+			} else {
+				z[i/2] |= uint64(vBits[i]) << 32
+			}
+		}
+	}
 	return z.ToMont()
 }

--- a/ff/util.go
+++ b/ff/util.go
@@ -1,13 +1,5 @@
 package ff

-import "math/big"
-
 func NewElement() *Element {
 	return &Element{}
 }
-
-func (e *Element) BigInt() *big.Int {
-	b := big.NewInt(0)
-	e.ToBigIntRegular(b)
-	return b
-}
--- a/go.mod
+++ b/go.mod
@@ -4,7 +4,7 @@ go 1.12

 require (
 	github.com/dchest/blake512 v1.0.0
-	github.com/ethereum/go-ethereum v1.8.27
-	github.com/stretchr/testify v1.3.0
-	golang.org/x/crypto v0.0.0-20190621222207-cc06ce4a13d4
+	github.com/ethereum/go-ethereum v1.9.12
+	github.com/stretchr/testify v1.4.0
+	golang.org/x/crypto v0.0.0-20200311171314-f7b00557c8c4
 )
--- a/go.sum
+++ b/go.sum
@@ -1,20 +1,172 @@
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+gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw=
+gopkg.in/urfave/cli.v1 v1.20.0/go.mod h1:vuBzUtMdQeixQj8LVd+/98pzhxNGQoyuPBlsXHOQNO0=
+gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gotest.tools v2.2.0+incompatible/go.mod h1:DsYFclhRJ6vuDpmuTbkuFWG+y2sxOXAzmJt81HFBacw=
--- a/mimc7/mimc7.go
+++ b/mimc7/mimc7.go
@@ -137,7 +137,7 @@ func Hash(arr []*big.Int, key *big.Int) (*big.Int, error) {

 // HashBytes hashes a msg byte slice by blocks of 31 bytes encoded as
 // little-endian
-func HashBytes(b []byte) (*big.Int, error) {
+func HashBytes(b []byte) *big.Int {
 	n := 31
 	bElems := make([]*big.Int, 0, len(b)/n+1)
 	for i := 0; i < len(b)/n; i++ {
@@ -150,5 +150,9 @@ func HashBytes(b []byte) (*big.Int, error) {
 		utils.SetBigIntFromLEBytes(v, b[(len(b)/n)*n:])
 		bElems = append(bElems, v)
 	}
-	return Hash(bElems, nil)
+	h, err := Hash(bElems, nil)
+	if err != nil {
+		panic(err)
+	}
+	return h
 }
--- a/mimc7/mimc7_test.go
+++ b/mimc7/mimc7_test.go
@@ -74,8 +74,7 @@ func TestMIMC7(t *testing.T) {
 	assert.Equal(t, "0x"+hex.EncodeToString((*big.Int)(h4).Bytes()), "0x284bc1f34f335933a23a433b6ff3ee179d682cd5e5e2fcdd2d964afa85104beb")

 	msg := []byte("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.")
-	hmsg, err := HashBytes(msg)
-	assert.Nil(t, err)
+	hmsg := HashBytes(msg)
 	assert.Equal(t, "16855787120419064316734350414336285711017110414939748784029922801367685456065", hmsg.String())
 }

@@ -87,6 +86,6 @@ func BenchmarkMIMC7(b *testing.B) {
 	bigArray4 := []*big.Int{b12, b45, b78, b41}

 	for i := 0; i < b.N; i++ {
-		Hash(bigArray4, nil)
+		Hash(bigArray4, nil) //nolint:errcheck
 	}
 }
--- a/poseidon/poseidon.go
+++ b/poseidon/poseidon.go
@@ -179,7 +179,7 @@ func Hash(arr []*big.Int) (*big.Int, error) {

 // HashBytes hashes a msg byte slice by blocks of 31 bytes encoded as
 // little-endian
-func HashBytes(b []byte) (*big.Int, error) {
+func HashBytes(b []byte) *big.Int {
 	n := 31
 	bElems := make([]*big.Int, 0, len(b)/n+1)
 	for i := 0; i < len(b)/n; i++ {
@@ -193,5 +193,9 @@ func HashBytes(b []byte) (*big.Int, error) {
 		utils.SetBigIntFromLEBytes(v, b[(len(b)/n)*n:])
 		bElems = append(bElems, v)
 	}
-	return Hash(bElems)
+	h, err := Hash(bElems)
+	if err != nil {
+		panic(err)
+	}
+	return h
 }
--- a/poseidon/poseidon_test.go
+++ b/poseidon/poseidon_test.go
@@ -73,8 +73,7 @@ func TestPoseidon(t *testing.T) {
 	assert.Nil(t, err)
 	assert.Equal(t, "2978613163687734485261639854325792381691890647104372645321246092227111432722", hmsg2.String())

-	hmsg2, err = HashBytes(msg2)
-	assert.Nil(t, err)
+	hmsg2 = HashBytes(msg2)
 	assert.Equal(t, "2978613163687734485261639854325792381691890647104372645321246092227111432722", hmsg2.String())
 }

@@ -104,7 +103,7 @@ func BenchmarkPoseidon(b *testing.B) {
 	bigArray4 := []*big.Int{b12, b45, b78, b41}

 	for i := 0; i < b.N; i++ {
-		Hash(bigArray4)
+		Hash(bigArray4) //nolint:errcheck
 	}
 }

@@ -117,6 +116,6 @@ func BenchmarkPoseidonLarge(b *testing.B) {
 	bigArray4 := []*big.Int{b12, b45, b78, b41}

 	for i := 0; i < b.N; i++ {
-		Hash(bigArray4)
+		Hash(bigArray4) //nolint:errcheck
 	}
 }
--- a/utils/showarchbits_test.go
+++ b/utils/showarchbits_test.go
@@ -0,0 +1,11 @@
+package utils
+
+import (
+	"fmt"
+	"math/bits"
+	"testing"
+)
+
+func TestShowArchBits(t *testing.T) {
+	fmt.Printf("Architecture is %v bits\n", bits.UintSize)
+}
--- a/utils/utils.go
+++ b/utils/utils.go
@@ -66,9 +66,7 @@ func HexEncode(bs []byte) string {

 // HexDecode decodes a hex string into an array of bytes.
 func HexDecode(h string) ([]byte, error) {
-	if strings.HasPrefix(h, "0x") {
-		h = h[2:]
-	}
+	h = strings.TrimPrefix(h, "0x")
 	return hex.DecodeString(h)
 }

@@ -92,10 +90,7 @@ func HexDecodeInto(dst []byte, h []byte) error {

 // CheckBigIntInField checks if given *big.Int fits in a Field Q element
 func CheckBigIntInField(a *big.Int) bool {
-	if a.Cmp(constants.Q) != -1 {
-		return false
-	}
-	return true
+	return a.Cmp(constants.Q) == -1
 }

 // CheckBigIntArrayInField checks if given *big.Int fits in a Field Q element
@@ -108,6 +103,7 @@ func CheckBigIntArrayInField(arr []*big.Int) bool {
 	return true
 }

+// BigIntArrayToElementArray converts an array of *big.Int into an array of *ff.Element
 func BigIntArrayToElementArray(bi []*big.Int) []*ff.Element {
 	var o []*ff.Element
 	for i := range bi {
@@ -115,3 +111,15 @@ func BigIntArrayToElementArray(bi []*big.Int) []*ff.Element {
 	}
 	return o
 }
+
+// ElementArrayToBigIntArray converts an array of *ff.Element into an array of *big.Int
+func ElementArrayToBigIntArray(e []*ff.Element) []*big.Int {
+	var o []*big.Int
+	for i := range e {
+		ei := e[i]
+		bi := big.NewInt(0)
+		ei.ToBigIntRegular(bi)
+		o = append(o, bi)
+	}
+	return o
+}
Author	SHA1	Message	Date
arnaucube	e134988b1b	Rm .travis.yml	2020-05-22 13:33:01 +02:00
arnaucube	3a9171000b	Poseidon & MiMC7 HashBytes remove return of err	2020-05-22 00:42:14 +02:00
Eduard S	b1468fc076	Merge pull request #23 from iden3/feature/expose-method Expose SkToBigInt for usage from other packages & repos	2020-04-28 18:31:15 +02:00
arnaucube	d189a6bedc	Expose SkToBigInt for usage from other packages & repos	2020-04-22 14:53:31 +02:00
Eduard S	14c3144613	Merge pull request #22 from iden3/feature/utils-elembigintconv Add utils.ElementArrayToBigIntArray	2020-04-21 15:31:34 +02:00
arnaucube	b98a9fe65a	Add utils.ElementArrayToBigIntArray	2020-04-20 12:45:35 +02:00
arnau	4d1bbacd6c	Merge pull request #21 from iden3/feature/githubactions Add github actions and remove travis	2020-04-14 21:45:30 +02:00
Eduard S	0ac8b46493	Fix linters errors	2020-04-14 16:53:24 +02:00
Eduard S	14d09916cf	Add github actions and remove travis	2020-04-14 16:53:15 +02:00
arnau	eb41fe0757	Merge pull request #18 from iden3/feature/fix32bits Fix compat with 32 bit arch	2020-03-18 11:55:56 +01:00
Eduard S	e10db811aa	Fix compat with 32 bit arch	2020-03-17 17:17:45 +01:00