Add ProvingKey binary parser

The time on the parsing doesn't improve, as the data from the binary file needs to be converted to `affine` representation, and then parsed into the `bn256.G1` & `bn256.G2` formats (Montgomery). But the size of the ProvingKey files in binary is much smaller, so will be better handled by the smarthpones. - Parse time benchmarks: ``` BenchmarkParsePk/Parse_Pk_bin_circuit1k-4 2 563729994 ns/op BenchmarkParsePk/Parse_Pk_json_circuit1k-4 635641 1941 ns/op BenchmarkParsePk/Parse_Pk_bin_circuit5k-4 1 2637941658 ns/op BenchmarkParsePk/Parse_Pk_json_circuit5k-4 1 2986560185 ns/op BenchmarkParsePk/Parse_Pk_bin_circuit10k-4 1 5337639150 ns/op BenchmarkParsePk/Parse_Pk_json_circuit10k-4 1 6149568824 ns/op BenchmarkParsePk/Parse_Pk_bin_circuit20k-4 1 10533654623 ns/op BenchmarkParsePk/Parse_Pk_json_circuit20k-4 1 11657326851 ns/op ``` - Size of ProvingKey file for a circuit of 50k constraints: ``` circuit 20k constraints: 10097812 bytes of proving_key.bin 29760049 bytes of proving_key.json circuit 50k constraints: 24194964 bytes of proving_key.bin 71484081 bytes of proving_key.json ```
Merge pull request #11 from iden3/feature/proof-parsers
2026-02-07 11:26:44 +01:00 · 2020-05-20 12:25:27 +02:00 · 2020-05-07 12:15:08 +02:00 · 2020-05-06 14:45:44 +02:00 · 2020-05-06 11:43:06 +02:00 · 2020-05-06 09:27:15 +02:00
9 changed files with 1057 additions and 527 deletions
--- a/parsers/parsers.go
+++ b/parsers/parsers.go
@@ -3,6 +3,7 @@ package parsers
 import (
 	"bufio"
 	"bytes"
+	"encoding/binary"
 	"encoding/hex"
 	"encoding/json"
 	"fmt"
@@ -467,8 +468,35 @@ func stringToG2(h [][]string) (*bn256.G2, error) {
 	return p, err
 }

-// ProofToJson outputs the Proof i Json format
-func ProofToJson(p *types.Proof) ([]byte, error) {
+// ProofStringToSmartContractFormat converts the ProofString to a ProofString in the SmartContract format in a ProofString structure
+func ProofStringToSmartContractFormat(s ProofString) ProofString {
+	var rs ProofString
+	rs.A = make([]string, 2)
+	rs.B = make([][]string, 2)
+	rs.B[0] = make([]string, 2)
+	rs.B[1] = make([]string, 2)
+	rs.C = make([]string, 2)
+
+	rs.A[0] = s.A[0]
+	rs.A[1] = s.A[1]
+	rs.B[0][0] = s.B[0][1]
+	rs.B[0][1] = s.B[0][0]
+	rs.B[1][0] = s.B[1][1]
+	rs.B[1][1] = s.B[1][0]
+	rs.C[0] = s.C[0]
+	rs.C[1] = s.C[1]
+	rs.Protocol = s.Protocol
+	return rs
+}
+
+// ProofToSmartContractFormat converts the *types.Proof to a ProofString in the SmartContract format in a ProofString structure
+func ProofToSmartContractFormat(p *types.Proof) ProofString {
+	s := ProofToString(p)
+	return ProofStringToSmartContractFormat(s)
+}
+
+// ProofToString converts the Proof to ProofString
+func ProofToString(p *types.Proof) ProofString {
 	var ps ProofString
 	ps.A = make([]string, 3)
 	ps.B = make([][]string, 3)
@@ -497,10 +525,55 @@ func ProofToJson(p *types.Proof) ([]byte, error) {

 	ps.Protocol = "groth"

+	return ps
+}
+
+// ProofToJson outputs the Proof i Json format
+func ProofToJson(p *types.Proof) ([]byte, error) {
+	ps := ProofToString(p)
 	return json.Marshal(ps)
 }

-// ParseWitness parses binary file representation of the Witness into the Witness struct
+// ProofToHex converts the Proof to ProofString with hexadecimal strings
+func ProofToHex(p *types.Proof) ProofString {
+	var ps ProofString
+	ps.A = make([]string, 3)
+	ps.B = make([][]string, 3)
+	ps.B[0] = make([]string, 2)
+	ps.B[1] = make([]string, 2)
+	ps.B[2] = make([]string, 2)
+	ps.C = make([]string, 3)
+
+	a := p.A.Marshal()
+	ps.A[0] = "0x" + hex.EncodeToString(new(big.Int).SetBytes(a[:32]).Bytes())
+	ps.A[1] = "0x" + hex.EncodeToString(new(big.Int).SetBytes(a[32:64]).Bytes())
+	ps.A[2] = "1"
+
+	b := p.B.Marshal()
+	ps.B[0][1] = "0x" + hex.EncodeToString(new(big.Int).SetBytes(b[:32]).Bytes())
+	ps.B[0][0] = "0x" + hex.EncodeToString(new(big.Int).SetBytes(b[32:64]).Bytes())
+	ps.B[1][1] = "0x" + hex.EncodeToString(new(big.Int).SetBytes(b[64:96]).Bytes())
+	ps.B[1][0] = "0x" + hex.EncodeToString(new(big.Int).SetBytes(b[96:128]).Bytes())
+	ps.B[2][0] = "1"
+	ps.B[2][1] = "0"
+
+	c := p.C.Marshal()
+	ps.C[0] = "0x" + hex.EncodeToString(new(big.Int).SetBytes(c[:32]).Bytes())
+	ps.C[1] = "0x" + hex.EncodeToString(new(big.Int).SetBytes(c[32:64]).Bytes())
+	ps.C[2] = "1"
+
+	ps.Protocol = "groth"
+
+	return ps
+}
+
+// ProofToJsonHex outputs the Proof i Json format with hexadecimal strings
+func ProofToJsonHex(p *types.Proof) ([]byte, error) {
+	ps := ProofToHex(p)
+	return json.Marshal(ps)
+}
+
+// ParseWitnessBin parses binary file representation of the Witness into the Witness struct
 func ParseWitnessBin(f *os.File) (types.Witness, error) {
 	var w types.Witness
 	r := bufio.NewReader(f)
@@ -527,3 +600,368 @@ func swapEndianness(b []byte) []byte {
 	}
 	return o
 }
+
+func readNBytes(r io.Reader, n int) ([]byte, error) {
+	b := make([]byte, n)
+	_, err := io.ReadFull(r, b)
+	if err != nil {
+		return b, err
+	}
+	return b, nil
+}
+
+// ParsePkBin parses binary file representation of the ProvingKey into the ProvingKey struct
+func ParsePkBin(f *os.File) (*types.Pk, error) {
+	o := 0
+	var pk types.Pk
+	r := bufio.NewReader(f)
+
+	b, err := readNBytes(r, 12)
+	if err != nil {
+		return nil, err
+	}
+	pk.NVars = int(binary.LittleEndian.Uint32(b[:4]))
+	pk.NPublic = int(binary.LittleEndian.Uint32(b[4:8]))
+	pk.DomainSize = int(binary.LittleEndian.Uint32(b[8:12]))
+	o += 12
+
+	b, err = readNBytes(r, 8)
+	if err != nil {
+		return nil, err
+	}
+	pPolsA := int(binary.LittleEndian.Uint32(b[:4]))
+	pPolsB := int(binary.LittleEndian.Uint32(b[4:8]))
+	o += 8
+
+	b, err = readNBytes(r, 20)
+	if err != nil {
+		return nil, err
+	}
+	pPointsA := int(binary.LittleEndian.Uint32(b[:4]))
+	pPointsB1 := int(binary.LittleEndian.Uint32(b[4:8]))
+	pPointsB2 := int(binary.LittleEndian.Uint32(b[8:12]))
+	pPointsC := int(binary.LittleEndian.Uint32(b[12:16]))
+	pPointsHExps := int(binary.LittleEndian.Uint32(b[16:20]))
+	o += 20
+
+	b, err = readNBytes(r, 64)
+	if err != nil {
+		return nil, err
+	}
+	pk.VkAlpha1 = new(bn256.G1)
+	_, err = pk.VkAlpha1.Unmarshal(fromMont1Q(b))
+	if err != nil {
+		return nil, err
+	}
+
+	b, err = readNBytes(r, 64)
+	if err != nil {
+		return nil, err
+	}
+	pk.VkBeta1 = new(bn256.G1)
+	_, err = pk.VkBeta1.Unmarshal(fromMont1Q(b))
+	if err != nil {
+		return nil, err
+	}
+
+	b, err = readNBytes(r, 64)
+	if err != nil {
+		return nil, err
+	}
+	pk.VkDelta1 = new(bn256.G1)
+	_, err = pk.VkDelta1.Unmarshal(fromMont1Q(b))
+	if err != nil {
+		return nil, err
+	}
+	b, err = readNBytes(r, 128)
+	if err != nil {
+		return nil, err
+	}
+	pk.VkBeta2 = new(bn256.G2)
+	_, err = pk.VkBeta2.Unmarshal(fromMont2Q(b))
+	if err != nil {
+		return nil, err
+	}
+	b, err = readNBytes(r, 128)
+	if err != nil {
+		return nil, err
+	}
+	pk.VkDelta2 = new(bn256.G2)
+	_, err = pk.VkDelta2.Unmarshal(fromMont2Q(b))
+	if err != nil {
+		return nil, err
+	}
+	o += 448
+	if o != pPolsA {
+		return nil, fmt.Errorf("Unexpected offset, expected: %v, actual: %v", pPolsA, o)
+	}
+
+	// PolsA
+	for i := 0; i < pk.NVars; i++ {
+		b, err = readNBytes(r, 4)
+		if err != nil {
+			return nil, err
+		}
+		keysLength := int(binary.LittleEndian.Uint32(b[:4]))
+		o += 4
+		polsMap := make(map[int]*big.Int)
+		for j := 0; j < keysLength; j++ {
+			bK, err := readNBytes(r, 4)
+			if err != nil {
+				return nil, err
+			}
+			key := int(binary.LittleEndian.Uint32(bK[:4]))
+			o += 4
+
+			b, err := readNBytes(r, 32)
+			if err != nil {
+				return nil, err
+			}
+			polsMap[key] = new(big.Int).SetBytes(fromMont1R(b[:32]))
+			o += 32
+		}
+		pk.PolsA = append(pk.PolsA, polsMap)
+	}
+	if o != pPolsB {
+		return nil, fmt.Errorf("Unexpected offset, expected: %v, actual: %v", pPolsB, o)
+	}
+	// PolsB
+	for i := 0; i < pk.NVars; i++ {
+		b, err = readNBytes(r, 4)
+		if err != nil {
+			return nil, err
+		}
+		keysLength := int(binary.LittleEndian.Uint32(b[:4]))
+		o += 4
+		polsMap := make(map[int]*big.Int)
+		for j := 0; j < keysLength; j++ {
+			bK, err := readNBytes(r, 4)
+			if err != nil {
+				return nil, err
+			}
+			key := int(binary.LittleEndian.Uint32(bK[:4]))
+			o += 4
+
+			b, err := readNBytes(r, 32)
+			if err != nil {
+				return nil, err
+			}
+			polsMap[key] = new(big.Int).SetBytes(fromMont1R(b[:32]))
+			o += 32
+		}
+		pk.PolsB = append(pk.PolsB, polsMap)
+	}
+	if o != pPointsA {
+		return nil, fmt.Errorf("Unexpected offset, expected: %v, actual: %v", pPointsA, o)
+	}
+	// A
+	for i := 0; i < pk.NVars; i++ {
+		b, err = readNBytes(r, 64)
+		if err != nil {
+			return nil, err
+		}
+		p1 := new(bn256.G1)
+		_, err = p1.Unmarshal(fromMont1Q(b))
+		if err != nil {
+			return nil, err
+		}
+		pk.A = append(pk.A, p1)
+		o += 64
+	}
+	if o != pPointsB1 {
+		return nil, fmt.Errorf("Unexpected offset, expected: %v, actual: %v", pPointsB1, o)
+	}
+	// B1
+	for i := 0; i < pk.NVars; i++ {
+		b, err = readNBytes(r, 64)
+		if err != nil {
+			return nil, err
+		}
+		p1 := new(bn256.G1)
+		_, err = p1.Unmarshal(fromMont1Q(b))
+		if err != nil {
+			return nil, err
+		}
+		pk.B1 = append(pk.B1, p1)
+		o += 64
+	}
+	if o != pPointsB2 {
+		return nil, fmt.Errorf("Unexpected offset, expected: %v, actual: %v", pPointsB2, o)
+	}
+	// B2
+	for i := 0; i < pk.NVars; i++ {
+		b, err = readNBytes(r, 128)
+		if err != nil {
+			return nil, err
+		}
+		p2 := new(bn256.G2)
+		_, err = p2.Unmarshal(fromMont2Q(b))
+		if err != nil {
+			return nil, err
+		}
+		pk.B2 = append(pk.B2, p2)
+		o += 128
+	}
+	if o != pPointsC {
+		return nil, fmt.Errorf("Unexpected offset, expected: %v, actual: %v", pPointsC, o)
+	}
+	// C
+	zb := make([]byte, 64)
+	z := new(bn256.G1)
+	_, err = z.Unmarshal(zb)
+	if err != nil {
+		return nil, err
+	}
+	pk.C = append(pk.C, z) // circom behaviour (3x null==["0", "0", "0"])
+	pk.C = append(pk.C, z)
+	pk.C = append(pk.C, z)
+	for i := pk.NPublic + 1; i < pk.NVars; i++ {
+		b, err = readNBytes(r, 64)
+		if err != nil {
+			return nil, err
+		}
+		p1 := new(bn256.G1)
+		_, err = p1.Unmarshal(fromMont1Q(b))
+		if err != nil {
+			return nil, err
+		}
+		pk.C = append(pk.C, p1)
+		o += 64
+	}
+	if o != pPointsHExps {
+		return nil, fmt.Errorf("Unexpected offset, expected: %v, actual: %v", pPointsHExps, o)
+	}
+	for i := 0; i < pk.DomainSize; i++ {
+		b, err = readNBytes(r, 64)
+		if err != nil {
+			return nil, err
+		}
+		p1 := new(bn256.G1)
+		_, err = p1.Unmarshal(fromMont1Q(b))
+		if err != nil {
+			return nil, err
+		}
+		pk.HExps = append(pk.HExps, p1)
+	}
+	return &pk, nil
+}
+
+func fromMont1Q(m []byte) []byte {
+	a := new(big.Int).SetBytes(swapEndianness(m[:32]))
+	b := new(big.Int).SetBytes(swapEndianness(m[32:64]))
+
+	x := coordFromMont(a, types.Q)
+	y := coordFromMont(b, types.Q)
+	if bytes.Equal(x.Bytes(), big.NewInt(1).Bytes()) {
+		x = big.NewInt(0)
+	}
+	if bytes.Equal(y.Bytes(), big.NewInt(1).Bytes()) {
+		y = big.NewInt(0)
+	}
+
+	xBytes := x.Bytes()
+	yBytes := y.Bytes()
+	if len(xBytes) != 32 {
+		xBytes = addZPadding(xBytes)
+	}
+	if len(yBytes) != 32 {
+		yBytes = addZPadding(yBytes)
+	}
+
+	var p []byte
+	p = append(p, xBytes...)
+	p = append(p, yBytes...)
+
+	return p
+}
+
+func fromMont2Q(m []byte) []byte {
+	a := new(big.Int).SetBytes(swapEndianness(m[:32]))
+	b := new(big.Int).SetBytes(swapEndianness(m[32:64]))
+	c := new(big.Int).SetBytes(swapEndianness(m[64:96]))
+	d := new(big.Int).SetBytes(swapEndianness(m[96:128]))
+
+	x := coordFromMont(a, types.Q)
+	y := coordFromMont(b, types.Q)
+	z := coordFromMont(c, types.Q)
+	t := coordFromMont(d, types.Q)
+
+	if bytes.Equal(x.Bytes(), big.NewInt(1).Bytes()) {
+		x = big.NewInt(0)
+	}
+	if bytes.Equal(y.Bytes(), big.NewInt(1).Bytes()) {
+		y = big.NewInt(0)
+	}
+	if bytes.Equal(z.Bytes(), big.NewInt(1).Bytes()) {
+		z = big.NewInt(0)
+	}
+	if bytes.Equal(t.Bytes(), big.NewInt(1).Bytes()) {
+		t = big.NewInt(0)
+	}
+
+	xBytes := x.Bytes()
+	yBytes := y.Bytes()
+	zBytes := z.Bytes()
+	tBytes := t.Bytes()
+	if len(xBytes) != 32 {
+		xBytes = addZPadding(xBytes)
+	}
+	if len(yBytes) != 32 {
+		yBytes = addZPadding(yBytes)
+	}
+	if len(zBytes) != 32 {
+		zBytes = addZPadding(zBytes)
+	}
+	if len(tBytes) != 32 {
+		tBytes = addZPadding(tBytes)
+	}
+
+	var p []byte
+	p = append(p, yBytes...) // swap
+	p = append(p, xBytes...)
+	p = append(p, tBytes...)
+	p = append(p, zBytes...)
+
+	return p
+}
+
+func fromMont1R(m []byte) []byte {
+	a := new(big.Int).SetBytes(swapEndianness(m[:32]))
+
+	x := coordFromMont(a, types.R)
+
+	return x.Bytes()
+}
+
+func fromMont2R(m []byte) []byte {
+	a := new(big.Int).SetBytes(swapEndianness(m[:32]))
+	b := new(big.Int).SetBytes(swapEndianness(m[32:64]))
+	c := new(big.Int).SetBytes(swapEndianness(m[64:96]))
+	d := new(big.Int).SetBytes(swapEndianness(m[96:128]))
+
+	x := coordFromMont(a, types.R)
+	y := coordFromMont(b, types.R)
+	z := coordFromMont(c, types.R)
+	t := coordFromMont(d, types.R)
+
+	var p []byte
+	p = append(p, y.Bytes()...) // swap
+	p = append(p, x.Bytes()...)
+	p = append(p, t.Bytes()...)
+	p = append(p, z.Bytes()...)
+
+	return p
+}
+
+func coordFromMont(u, q *big.Int) *big.Int {
+	return new(big.Int).Mod(
+		new(big.Int).Mul(
+			u,
+			new(big.Int).ModInverse(
+				new(big.Int).Lsh(big.NewInt(1), 256),
+				q,
+			),
+		),
+		q,
+	)
+}
--- a/parsers/parsers_test.go
+++ b/parsers/parsers_test.go
@@ -172,3 +172,87 @@ func TestParseWitnessBin(t *testing.T) {
 	testCircuitParseWitnessBin(t, "circuit1k")
 	testCircuitParseWitnessBin(t, "circuit5k")
 }
+
+func TestProofSmartContractFormat(t *testing.T) {
+	proofJson, err := ioutil.ReadFile("../testdata/circuit1k/proof.json")
+	require.Nil(t, err)
+	proof, err := ParseProof(proofJson)
+	require.Nil(t, err)
+	pS := ProofToString(proof)
+
+	pSC := ProofToSmartContractFormat(proof)
+	assert.Nil(t, err)
+	assert.Equal(t, pS.A[0], pSC.A[0])
+	assert.Equal(t, pS.A[1], pSC.A[1])
+	assert.Equal(t, pS.B[0][0], pSC.B[0][1])
+	assert.Equal(t, pS.B[0][1], pSC.B[0][0])
+	assert.Equal(t, pS.B[1][0], pSC.B[1][1])
+	assert.Equal(t, pS.B[1][1], pSC.B[1][0])
+	assert.Equal(t, pS.C[0], pSC.C[0])
+	assert.Equal(t, pS.C[1], pSC.C[1])
+	assert.Equal(t, pS.Protocol, pSC.Protocol)
+
+	pSC2 := ProofStringToSmartContractFormat(pS)
+	assert.Equal(t, pSC, pSC2)
+
+}
+
+func testCircuitParsePkBin(t *testing.T, circuit string) {
+	pkBinFile, err := os.Open("../testdata/" + circuit + "/proving_key.bin")
+	require.Nil(t, err)
+	defer pkBinFile.Close()
+	pk, err := ParsePkBin(pkBinFile)
+	require.Nil(t, err)
+
+	pkJson, err := ioutil.ReadFile("../testdata/" + circuit + "/proving_key.json")
+	require.Nil(t, err)
+	pkJ, err := ParsePk(pkJson)
+	require.Nil(t, err)
+
+	assert.Equal(t, pkJ.NVars, pk.NVars)
+	assert.Equal(t, pkJ.NPublic, pk.NPublic)
+	assert.Equal(t, pkJ.DomainSize, pk.DomainSize)
+	assert.Equal(t, pkJ.VkAlpha1, pk.VkAlpha1)
+	assert.Equal(t, pkJ.VkBeta1, pk.VkBeta1)
+	assert.Equal(t, pkJ.VkDelta1, pk.VkDelta1)
+	assert.Equal(t, pkJ.VkDelta2, pk.VkDelta2)
+	assert.Equal(t, pkJ.PolsA, pk.PolsA)
+	assert.Equal(t, pkJ.PolsB, pk.PolsB)
+	assert.Equal(t, pkJ.A, pk.A)
+	assert.Equal(t, pkJ.B1, pk.B1)
+	assert.Equal(t, pkJ.B2, pk.B2)
+	assert.Equal(t, pkJ.C, pk.C)
+	assert.Equal(t, pkJ.HExps[:pkJ.DomainSize], pk.HExps[:pk.DomainSize]) // circom behaviour
+}
+
+func TestParsePkBin(t *testing.T) {
+	testCircuitParsePkBin(t, "circuit1k")
+	testCircuitParsePkBin(t, "circuit5k")
+}
+
+func benchmarkParsePk(b *testing.B, circuit string) {
+	pkJson, err := ioutil.ReadFile("../testdata/" + circuit + "/proving_key.json")
+	require.Nil(b, err)
+
+	pkBinFile, err := os.Open("../testdata/" + circuit + "/proving_key.bin")
+	require.Nil(b, err)
+	defer pkBinFile.Close()
+
+	b.Run("Parse Pk bin "+circuit, func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
+			ParsePk(pkJson)
+		}
+	})
+	b.Run("Parse Pk json "+circuit, func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
+			ParsePkBin(pkBinFile)
+		}
+	})
+}
+
+func BenchmarkParsePk(b *testing.B) {
+	benchmarkParsePk(b, "circuit1k")
+	benchmarkParsePk(b, "circuit5k")
+	// benchmarkParsePk(b, "circuit10k")
+	// benchmarkParsePk(b, "circuit20k")
+}
--- a/prover/gextra.go
+++ b/prover/gextra.go
@@ -1,21 +1,20 @@
 package prover

 import (
-        "math/big"
+	"math/big"
+
 	bn256 "github.com/ethereum/go-ethereum/crypto/bn256/cloudflare"
 	cryptoConstants "github.com/iden3/go-iden3-crypto/constants"
 )

-type TableG1 struct{
-   data []*bn256.G1
+type tableG1 struct {
+	data []*bn256.G1
 }

-
-func (t TableG1) GetData() []*bn256.G1 {
-  return t.data
+func (t tableG1) getData() []*bn256.G1 {
+	return t.data
 }

-
 // Compute table of gsize elements as ::
 //  Table[0] = Inf
 //  Table[1] = a[0]
@@ -23,191 +22,202 @@ func (t TableG1) GetData() []*bn256.G1 {
 //  Table[3] = a[0]+a[1]
 //  .....
 //  Table[(1<<gsize)-1] = a[0]+a[1]+...+a[gsize-1]
-func (t *TableG1) NewTableG1(a []*bn256.G1, gsize int){
-   // EC table
-   table := make([]*bn256.G1, 0)
+func (t *tableG1) newTableG1(a []*bn256.G1, gsize int, toaffine bool) {
+	// EC table
+	table := make([]*bn256.G1, 0)

-   // We need at least gsize elements. If not enough, fill with 0
-   a_ext := make([]*bn256.G1, 0)
-   a_ext = append(a_ext, a...)
+	// We need at least gsize elements. If not enough, fill with 0
+	aExt := make([]*bn256.G1, 0)
+	aExt = append(aExt, a...)

-   for i:=len(a); i<gsize; i++ {
-      a_ext = append(a_ext,new(bn256.G1).ScalarBaseMult(big.NewInt(0)))
-   }
+	for i := len(a); i < gsize; i++ {
+		aExt = append(aExt, new(bn256.G1).ScalarBaseMult(big.NewInt(0)))
+	}

-   elG1 := new(bn256.G1).ScalarBaseMult(big.NewInt(0))
-   table = append(table,elG1)
-   last_pow2 := 1
-   nelems := 0
-   for i :=1; i< 1<<gsize; i++ {
-      elG1 := new(bn256.G1)
-      // if power of 2
-      if i & (i-1) == 0{
-        last_pow2 = i
-        elG1.Set(a_ext[nelems])
-        nelems++
-      } else {
-        elG1.Add(table[last_pow2], table[i-last_pow2])
-        // TODO bn256 doesn't export MakeAffine function. We need to fork repo
-        //table[i].MakeAffine()
-      }
-      table = append(table, elG1)
-  }
-  t.data = table
+	elG1 := new(bn256.G1).ScalarBaseMult(big.NewInt(0))
+	table = append(table, elG1)
+	lastPow2 := 1
+	nelems := 0
+	for i := 1; i < 1<<gsize; i++ {
+		elG1 := new(bn256.G1)
+		// if power of 2
+		if i&(i-1) == 0 {
+			lastPow2 = i
+			elG1.Set(aExt[nelems])
+			nelems++
+		} else {
+			elG1.Add(table[lastPow2], table[i-lastPow2])
+			// TODO bn256 doesn't export MakeAffine function. We need to fork repo
+			//table[i].MakeAffine()
+		}
+		table = append(table, elG1)
+	}
+	if toaffine {
+		for i := 0; i < len(table); i++ {
+			info := table[i].Marshal()
+			table[i].Unmarshal(info)
+		}
+	}
+	t.data = table
+}
+
+func (t tableG1) Marshal() []byte {
+	info := make([]byte, 0)
+	for _, el := range t.data {
+		info = append(info, el.Marshal()...)
+	}
+
+	return info
 }

 // Multiply scalar by precomputed table of G1 elements
-func (t *TableG1) MulTableG1(k []*big.Int, Q_prev *bn256.G1, gsize int) *bn256.G1 {
-   // We need at least gsize elements. If not enough, fill with 0
-   k_ext := make([]*big.Int, 0)
-   k_ext = append(k_ext, k...)
+func (t *tableG1) mulTableG1(k []*big.Int, qPrev *bn256.G1, gsize int) *bn256.G1 {
+	// We need at least gsize elements. If not enough, fill with 0
+	kExt := make([]*big.Int, 0)
+	kExt = append(kExt, k...)

-   for i:=len(k); i < gsize; i++ {
-      k_ext = append(k_ext,new(big.Int).SetUint64(0))
-   }
-
-   Q := new(bn256.G1).ScalarBaseMult(big.NewInt(0))
-
-   msb := getMsb(k_ext)
-
-   for i := msb-1; i >= 0; i-- {
-        // TODO. bn256 doesn't export double operation. We will need to fork repo and export it
-	Q = new(bn256.G1).Add(Q,Q)
-        b := getBit(k_ext,i)
-	if b != 0 {
-          // TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
-	  Q.Add(Q, t.data[b])
+	for i := len(k); i < gsize; i++ {
+		kExt = append(kExt, new(big.Int).SetUint64(0))
 	}
-   }
-   if Q_prev != nil {
-     return Q.Add(Q,Q_prev)
-   } else {
-     return Q
-   }
+
+	Q := new(bn256.G1).ScalarBaseMult(big.NewInt(0))
+
+	msb := getMsb(kExt)
+
+	for i := msb - 1; i >= 0; i-- {
+		// TODO. bn256 doesn't export double operation. We will need to fork repo and export it
+		Q = new(bn256.G1).Add(Q, Q)
+		b := getBit(kExt, i)
+		if b != 0 {
+			// TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
+			Q.Add(Q, t.data[b])
+		}
+	}
+	if qPrev != nil {
+		return Q.Add(Q, qPrev)
+	}
+	return Q
 }

 // Multiply scalar by precomputed table of G1 elements without intermediate doubling
-func MulTableNoDoubleG1(t []TableG1, k []*big.Int,  Q_prev *bn256.G1, gsize int) *bn256.G1 {
-   // We need at least gsize elements. If not enough, fill with 0
-   min_nelems := len(t) * gsize
-   k_ext := make([]*big.Int, 0)
-   k_ext = append(k_ext, k...)
-   for i := len(k); i <  min_nelems; i++ {
-      k_ext = append(k_ext,new(big.Int).SetUint64(0))
-   }
-   // Init Adders
-   nbitsQ := cryptoConstants.Q.BitLen()
-   Q := make([]*bn256.G1,nbitsQ)
-
-   for i:=0; i< nbitsQ; i++ {
-     Q[i] = new(bn256.G1).ScalarBaseMult(big.NewInt(0))
-   }
-
-   // Perform bitwise addition
-   for j:=0; j < len(t); j++ {
-     msb := getMsb(k_ext[j*gsize:(j+1)*gsize])
-
-     for i := msb-1; i >= 0; i-- {
-        b := getBit(k_ext[j*gsize:(j+1)*gsize],i)
-	if b != 0 {
-          // TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
-	  Q[i].Add(Q[i], t[j].data[b])
+func mulTableNoDoubleG1(t []tableG1, k []*big.Int, qPrev *bn256.G1, gsize int) *bn256.G1 {
+	// We need at least gsize elements. If not enough, fill with 0
+	minNElems := len(t) * gsize
+	kExt := make([]*big.Int, 0)
+	kExt = append(kExt, k...)
+	for i := len(k); i < minNElems; i++ {
+		kExt = append(kExt, new(big.Int).SetUint64(0))
 	}
-     }
-   }
+	// Init Adders
+	nbitsQ := cryptoConstants.Q.BitLen()
+	Q := make([]*bn256.G1, nbitsQ)

-   // Consolidate Addition
-   R := new(bn256.G1).Set(Q[nbitsQ-1])
-   for i:=nbitsQ-1; i>0; i-- {
-      // TODO. bn256 doesn't export double operation. We will need to fork repo and export it
-      R = new(bn256.G1).Add(R,R)
-      R.Add(R,Q[i-1])
-   }
+	for i := 0; i < nbitsQ; i++ {
+		Q[i] = new(bn256.G1).ScalarBaseMult(big.NewInt(0))
+	}

-   if Q_prev != nil {
-      return R.Add(R,Q_prev)
-   } else {
-      return R
-   }
+	// Perform bitwise addition
+	for j := 0; j < len(t); j++ {
+		msb := getMsb(kExt[j*gsize : (j+1)*gsize])
+
+		for i := msb - 1; i >= 0; i-- {
+			b := getBit(kExt[j*gsize:(j+1)*gsize], i)
+			if b != 0 {
+				// TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
+				Q[i].Add(Q[i], t[j].data[b])
+			}
+		}
+	}
+
+	// Consolidate Addition
+	R := new(bn256.G1).Set(Q[nbitsQ-1])
+	for i := nbitsQ - 1; i > 0; i-- {
+		// TODO. bn256 doesn't export double operation. We will need to fork repo and export it
+		R = new(bn256.G1).Add(R, R)
+		R.Add(R, Q[i-1])
+	}
+
+	if qPrev != nil {
+		return R.Add(R, qPrev)
+	}
+	return R
 }

 // Compute tables within function. This solution should still be faster than std  multiplication
 // for gsize = 7
-func ScalarMultG1(a []*bn256.G1, k []*big.Int, Q_prev *bn256.G1, gsize int) *bn256.G1 {
-     ntables := int((len(a) + gsize - 1) / gsize)
-     table := TableG1{}
-     Q:= new(bn256.G1).ScalarBaseMult(new(big.Int))
+func scalarMultG1(a []*bn256.G1, k []*big.Int, qPrev *bn256.G1, gsize int) *bn256.G1 {
+	ntables := int((len(a) + gsize - 1) / gsize)
+	table := tableG1{}
+	Q := new(bn256.G1).ScalarBaseMult(new(big.Int))

-     for i:=0; i<ntables-1; i++ {
-       table.NewTableG1( a[i*gsize:(i+1)*gsize], gsize)
-       Q = table.MulTableG1(k[i*gsize:(i+1)*gsize], Q, gsize)
-     }
-     table.NewTableG1( a[(ntables-1)*gsize:], gsize)
-     Q = table.MulTableG1(k[(ntables-1)*gsize:], Q, gsize)
+	for i := 0; i < ntables-1; i++ {
+		table.newTableG1(a[i*gsize:(i+1)*gsize], gsize, false)
+		Q = table.mulTableG1(k[i*gsize:(i+1)*gsize], Q, gsize)
+	}
+	table.newTableG1(a[(ntables-1)*gsize:], gsize, false)
+	Q = table.mulTableG1(k[(ntables-1)*gsize:], Q, gsize)

-     if Q_prev != nil {
-        return Q.Add(Q,Q_prev)
-     } else {
-        return Q
-     }
+	if qPrev != nil {
+		return Q.Add(Q, qPrev)
+	}
+	return Q
 }

 // Multiply scalar by precomputed table of G1 elements without intermediate doubling
-func ScalarMultNoDoubleG1(a []*bn256.G1, k []*big.Int, Q_prev *bn256.G1, gsize int) *bn256.G1 {
-   ntables := int((len(a) + gsize - 1) / gsize)
-   table := TableG1{}
+func scalarMultNoDoubleG1(a []*bn256.G1, k []*big.Int, qPrev *bn256.G1, gsize int) *bn256.G1 {
+	ntables := int((len(a) + gsize - 1) / gsize)
+	table := tableG1{}

-   // We need at least gsize elements. If not enough, fill with 0
-   min_nelems := ntables * gsize
-   k_ext := make([]*big.Int, 0)
-   k_ext = append(k_ext, k...)
-   for i := len(k); i <  min_nelems; i++ {
-      k_ext = append(k_ext,new(big.Int).SetUint64(0))
-   }
-   // Init Adders
-   nbitsQ := cryptoConstants.Q.BitLen()
-   Q := make([]*bn256.G1,nbitsQ)
-
-   for i:=0; i< nbitsQ; i++ {
-     Q[i] = new(bn256.G1).ScalarBaseMult(big.NewInt(0))
-   }
-
-   // Perform bitwise addition
-   for j:=0; j < ntables-1; j++ {
-     table.NewTableG1( a[j*gsize:(j+1)*gsize], gsize)
-     msb := getMsb(k_ext[j*gsize:(j+1)*gsize])
-
-     for i := msb-1; i >= 0; i-- {
-        b := getBit(k_ext[j*gsize:(j+1)*gsize],i)
-	if b != 0 {
-          // TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
-	  Q[i].Add(Q[i], table.data[b])
+	// We need at least gsize elements. If not enough, fill with 0
+	minNElems := ntables * gsize
+	kExt := make([]*big.Int, 0)
+	kExt = append(kExt, k...)
+	for i := len(k); i < minNElems; i++ {
+		kExt = append(kExt, new(big.Int).SetUint64(0))
 	}
-     }
-   }
-   table.NewTableG1( a[(ntables-1)*gsize:], gsize)
-   msb := getMsb(k_ext[(ntables-1)*gsize:])
+	// Init Adders
+	nbitsQ := cryptoConstants.Q.BitLen()
+	Q := make([]*bn256.G1, nbitsQ)

-   for i := msb-1; i >= 0; i-- {
-     b := getBit(k_ext[(ntables-1)*gsize:],i)
-     if b != 0 {
-         // TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
-         Q[i].Add(Q[i], table.data[b])
-     }
-   }
+	for i := 0; i < nbitsQ; i++ {
+		Q[i] = new(bn256.G1).ScalarBaseMult(big.NewInt(0))
+	}

-   // Consolidate Addition
-   R := new(bn256.G1).Set(Q[nbitsQ-1])
-   for i:=nbitsQ-1; i>0; i-- {
-      // TODO. bn256 doesn't export double operation. We will need to fork repo and export it
-      R = new(bn256.G1).Add(R,R)
-      R.Add(R,Q[i-1])
-   }
-   if Q_prev != nil {
-     return R.Add(R,Q_prev)
-   } else {
-     return R
-   }
+	// Perform bitwise addition
+	for j := 0; j < ntables-1; j++ {
+		table.newTableG1(a[j*gsize:(j+1)*gsize], gsize, false)
+		msb := getMsb(kExt[j*gsize : (j+1)*gsize])
+
+		for i := msb - 1; i >= 0; i-- {
+			b := getBit(kExt[j*gsize:(j+1)*gsize], i)
+			if b != 0 {
+				// TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
+				Q[i].Add(Q[i], table.data[b])
+			}
+		}
+	}
+	table.newTableG1(a[(ntables-1)*gsize:], gsize, false)
+	msb := getMsb(kExt[(ntables-1)*gsize:])
+
+	for i := msb - 1; i >= 0; i-- {
+		b := getBit(kExt[(ntables-1)*gsize:], i)
+		if b != 0 {
+			// TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
+			Q[i].Add(Q[i], table.data[b])
+		}
+	}
+
+	// Consolidate Addition
+	R := new(bn256.G1).Set(Q[nbitsQ-1])
+	for i := nbitsQ - 1; i > 0; i-- {
+		// TODO. bn256 doesn't export double operation. We will need to fork repo and export it
+		R = new(bn256.G1).Add(R, R)
+		R.Add(R, Q[i-1])
+	}
+	if qPrev != nil {
+		return R.Add(R, qPrev)
+	}
+	return R
 }

 /////
@@ -215,16 +225,14 @@ func ScalarMultNoDoubleG1(a []*bn256.G1, k []*big.Int, Q_prev *bn256.G1, gsize i
 // TODO - How can avoid replicating code in G2?
 //G2

-type TableG2 struct{
-   data []*bn256.G2
+type tableG2 struct {
+	data []*bn256.G2
 }

-
-func (t TableG2) GetData() []*bn256.G2 {
-  return t.data
+func (t tableG2) getData() []*bn256.G2 {
+	return t.data
 }

-
 // Compute table of gsize elements as ::
 //  Table[0] = Inf
 //  Table[1] = a[0]
@@ -232,212 +240,224 @@ func (t TableG2) GetData() []*bn256.G2 {
 //  Table[3] = a[0]+a[1]
 //  .....
 //  Table[(1<<gsize)-1] = a[0]+a[1]+...+a[gsize-1]
-func (t *TableG2) NewTableG2(a []*bn256.G2, gsize int){
-   // EC table
-   table := make([]*bn256.G2, 0)
+// TODO -> toaffine = True doesnt work. Problem with Marshal/Unmarshal
+func (t *tableG2) newTableG2(a []*bn256.G2, gsize int, toaffine bool) {
+	// EC table
+	table := make([]*bn256.G2, 0)

-   // We need at least gsize elements. If not enough, fill with 0
-   a_ext := make([]*bn256.G2, 0)
-   a_ext = append(a_ext, a...)
+	// We need at least gsize elements. If not enough, fill with 0
+	aExt := make([]*bn256.G2, 0)
+	aExt = append(aExt, a...)

-   for i:=len(a); i<gsize; i++ {
-      a_ext = append(a_ext,new(bn256.G2).ScalarBaseMult(big.NewInt(0)))
-   }
+	for i := len(a); i < gsize; i++ {
+		aExt = append(aExt, new(bn256.G2).ScalarBaseMult(big.NewInt(0)))
+	}

-   elG2 := new(bn256.G2).ScalarBaseMult(big.NewInt(0))
-   table = append(table,elG2)
-   last_pow2 := 1
-   nelems := 0
-   for i :=1; i< 1<<gsize; i++ {
-      elG2 := new(bn256.G2)
-      // if power of 2
-      if i & (i-1) == 0{
-        last_pow2 = i
-        elG2.Set(a_ext[nelems])
-        nelems++
-      } else {
-        elG2.Add(table[last_pow2], table[i-last_pow2])
-        // TODO bn256 doesn't export MakeAffine function. We need to fork repo
-        //table[i].MakeAffine()
-      }
-      table = append(table, elG2)
-  }
-  t.data = table
+	elG2 := new(bn256.G2).ScalarBaseMult(big.NewInt(0))
+	table = append(table, elG2)
+	lastPow2 := 1
+	nelems := 0
+	for i := 1; i < 1<<gsize; i++ {
+		elG2 := new(bn256.G2)
+		// if power of 2
+		if i&(i-1) == 0 {
+			lastPow2 = i
+			elG2.Set(aExt[nelems])
+			nelems++
+		} else {
+			elG2.Add(table[lastPow2], table[i-lastPow2])
+			// TODO bn256 doesn't export MakeAffine function. We need to fork repo
+			//table[i].MakeAffine()
+		}
+		table = append(table, elG2)
+	}
+	if toaffine {
+		for i := 0; i < len(table); i++ {
+			info := table[i].Marshal()
+			table[i].Unmarshal(info)
+		}
+	}
+	t.data = table
+}
+
+func (t tableG2) Marshal() []byte {
+	info := make([]byte, 0)
+	for _, el := range t.data {
+		info = append(info, el.Marshal()...)
+	}
+
+	return info
 }

 // Multiply scalar by precomputed table of G2 elements
-func (t *TableG2) MulTableG2(k []*big.Int, Q_prev *bn256.G2, gsize int) *bn256.G2 {
-   // We need at least gsize elements. If not enough, fill with 0
-   k_ext := make([]*big.Int, 0)
-   k_ext = append(k_ext, k...)
+func (t *tableG2) mulTableG2(k []*big.Int, qPrev *bn256.G2, gsize int) *bn256.G2 {
+	// We need at least gsize elements. If not enough, fill with 0
+	kExt := make([]*big.Int, 0)
+	kExt = append(kExt, k...)

-   for i:=len(k); i < gsize; i++ {
-      k_ext = append(k_ext,new(big.Int).SetUint64(0))
-   }
-
-   Q := new(bn256.G2).ScalarBaseMult(big.NewInt(0))
-
-   msb := getMsb(k_ext)
-
-   for i := msb-1; i >= 0; i-- {
-        // TODO. bn256 doesn't export double operation. We will need to fork repo and export it
-	Q = new(bn256.G2).Add(Q,Q)
-        b := getBit(k_ext,i)
-	if b != 0 {
-          // TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
-	  Q.Add(Q, t.data[b])
+	for i := len(k); i < gsize; i++ {
+		kExt = append(kExt, new(big.Int).SetUint64(0))
 	}
-   }
-   if Q_prev != nil {
-     return Q.Add(Q, Q_prev)
-   } else {
-     return Q
-   }
+
+	Q := new(bn256.G2).ScalarBaseMult(big.NewInt(0))
+
+	msb := getMsb(kExt)
+
+	for i := msb - 1; i >= 0; i-- {
+		// TODO. bn256 doesn't export double operation. We will need to fork repo and export it
+		Q = new(bn256.G2).Add(Q, Q)
+		b := getBit(kExt, i)
+		if b != 0 {
+			// TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
+			Q.Add(Q, t.data[b])
+		}
+	}
+	if qPrev != nil {
+		return Q.Add(Q, qPrev)
+	}
+	return Q
 }

 // Multiply scalar by precomputed table of G2 elements without intermediate doubling
-func MulTableNoDoubleG2(t []TableG2, k []*big.Int, Q_prev *bn256.G2, gsize int) *bn256.G2 {
-   // We need at least gsize elements. If not enough, fill with 0
-   min_nelems := len(t) * gsize
-   k_ext := make([]*big.Int, 0)
-   k_ext = append(k_ext, k...)
-   for i := len(k); i <  min_nelems; i++ {
-      k_ext = append(k_ext,new(big.Int).SetUint64(0))
-   }
-   // Init Adders
-   nbitsQ := cryptoConstants.Q.BitLen()
-   Q := make([]*bn256.G2,nbitsQ)
-
-   for i:=0; i< nbitsQ; i++ {
-     Q[i] = new(bn256.G2).ScalarBaseMult(big.NewInt(0))
-   }
-
-   // Perform bitwise addition
-   for j:=0; j < len(t); j++ {
-     msb := getMsb(k_ext[j*gsize:(j+1)*gsize])
-
-     for i := msb-1; i >= 0; i-- {
-        b := getBit(k_ext[j*gsize:(j+1)*gsize],i)
-	if b != 0 {
-          // TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
-	  Q[i].Add(Q[i], t[j].data[b])
+func mulTableNoDoubleG2(t []tableG2, k []*big.Int, qPrev *bn256.G2, gsize int) *bn256.G2 {
+	// We need at least gsize elements. If not enough, fill with 0
+	minNElems := len(t) * gsize
+	kExt := make([]*big.Int, 0)
+	kExt = append(kExt, k...)
+	for i := len(k); i < minNElems; i++ {
+		kExt = append(kExt, new(big.Int).SetUint64(0))
 	}
-     }
-   }
+	// Init Adders
+	nbitsQ := cryptoConstants.Q.BitLen()
+	Q := make([]*bn256.G2, nbitsQ)

-   // Consolidate Addition
-   R := new(bn256.G2).Set(Q[nbitsQ-1])
-   for i:=nbitsQ-1; i>0; i-- {
-      // TODO. bn256 doesn't export double operation. We will need to fork repo and export it
-      R = new(bn256.G2).Add(R,R)
-      R.Add(R,Q[i-1])
-   }
-   if Q_prev != nil {
-     return R.Add(R,Q_prev)
-   } else {
-     return R
-   }
+	for i := 0; i < nbitsQ; i++ {
+		Q[i] = new(bn256.G2).ScalarBaseMult(big.NewInt(0))
+	}
+
+	// Perform bitwise addition
+	for j := 0; j < len(t); j++ {
+		msb := getMsb(kExt[j*gsize : (j+1)*gsize])
+
+		for i := msb - 1; i >= 0; i-- {
+			b := getBit(kExt[j*gsize:(j+1)*gsize], i)
+			if b != 0 {
+				// TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
+				Q[i].Add(Q[i], t[j].data[b])
+			}
+		}
+	}
+
+	// Consolidate Addition
+	R := new(bn256.G2).Set(Q[nbitsQ-1])
+	for i := nbitsQ - 1; i > 0; i-- {
+		// TODO. bn256 doesn't export double operation. We will need to fork repo and export it
+		R = new(bn256.G2).Add(R, R)
+		R.Add(R, Q[i-1])
+	}
+	if qPrev != nil {
+		return R.Add(R, qPrev)
+	}
+	return R
 }

 // Compute tables within function. This solution should still be faster than std  multiplication
 // for gsize = 7
-func ScalarMultG2(a []*bn256.G2, k []*big.Int, Q_prev *bn256.G2, gsize int) *bn256.G2 {
-     ntables := int((len(a) + gsize - 1) / gsize)
-     table := TableG2{}
-     Q:= new(bn256.G2).ScalarBaseMult(new(big.Int))
+func scalarMultG2(a []*bn256.G2, k []*big.Int, qPrev *bn256.G2, gsize int) *bn256.G2 {
+	ntables := int((len(a) + gsize - 1) / gsize)
+	table := tableG2{}
+	Q := new(bn256.G2).ScalarBaseMult(new(big.Int))

-     for i:=0; i<ntables-1; i++ {
-       table.NewTableG2( a[i*gsize:(i+1)*gsize], gsize)
-       Q = table.MulTableG2(k[i*gsize:(i+1)*gsize], Q, gsize)
-     }
-     table.NewTableG2( a[(ntables-1)*gsize:], gsize)
-     Q = table.MulTableG2(k[(ntables-1)*gsize:], Q, gsize)
+	for i := 0; i < ntables-1; i++ {
+		table.newTableG2(a[i*gsize:(i+1)*gsize], gsize, false)
+		Q = table.mulTableG2(k[i*gsize:(i+1)*gsize], Q, gsize)
+	}
+	table.newTableG2(a[(ntables-1)*gsize:], gsize, false)
+	Q = table.mulTableG2(k[(ntables-1)*gsize:], Q, gsize)

-     if Q_prev != nil {
-       return Q.Add(Q,Q_prev)
-     } else {
-       return Q
-     }
+	if qPrev != nil {
+		return Q.Add(Q, qPrev)
+	}
+	return Q
 }

 // Multiply scalar by precomputed table of G2 elements without intermediate doubling
-func ScalarMultNoDoubleG2(a []*bn256.G2, k []*big.Int, Q_prev *bn256.G2, gsize int) *bn256.G2 {
-   ntables := int((len(a) + gsize - 1) / gsize)
-   table := TableG2{}
+func scalarMultNoDoubleG2(a []*bn256.G2, k []*big.Int, qPrev *bn256.G2, gsize int) *bn256.G2 {
+	ntables := int((len(a) + gsize - 1) / gsize)
+	table := tableG2{}

-   // We need at least gsize elements. If not enough, fill with 0
-   min_nelems := ntables * gsize
-   k_ext := make([]*big.Int, 0)
-   k_ext = append(k_ext, k...)
-   for i := len(k); i <  min_nelems; i++ {
-      k_ext = append(k_ext,new(big.Int).SetUint64(0))
-   }
-   // Init Adders
-   nbitsQ := cryptoConstants.Q.BitLen()
-   Q := make([]*bn256.G2,nbitsQ)
-
-   for i:=0; i< nbitsQ; i++ {
-     Q[i] = new(bn256.G2).ScalarBaseMult(big.NewInt(0))
-   }
-
-   // Perform bitwise addition
-   for j:=0; j < ntables-1; j++ {
-     table.NewTableG2( a[j*gsize:(j+1)*gsize], gsize)
-     msb := getMsb(k_ext[j*gsize:(j+1)*gsize])
-
-     for i := msb-1; i >= 0; i-- {
-        b := getBit(k_ext[j*gsize:(j+1)*gsize],i)
-	if b != 0 {
-          // TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
-	  Q[i].Add(Q[i], table.data[b])
+	// We need at least gsize elements. If not enough, fill with 0
+	minNElems := ntables * gsize
+	kExt := make([]*big.Int, 0)
+	kExt = append(kExt, k...)
+	for i := len(k); i < minNElems; i++ {
+		kExt = append(kExt, new(big.Int).SetUint64(0))
 	}
-     }
-   }
-   table.NewTableG2( a[(ntables-1)*gsize:], gsize)
-   msb := getMsb(k_ext[(ntables-1)*gsize:])
+	// Init Adders
+	nbitsQ := cryptoConstants.Q.BitLen()
+	Q := make([]*bn256.G2, nbitsQ)

-   for i := msb-1; i >= 0; i-- {
-     b := getBit(k_ext[(ntables-1)*gsize:],i)
-     if b != 0 {
-         // TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
-         Q[i].Add(Q[i], table.data[b])
-     }
-   }
+	for i := 0; i < nbitsQ; i++ {
+		Q[i] = new(bn256.G2).ScalarBaseMult(big.NewInt(0))
+	}

-   // Consolidate Addition
-   R := new(bn256.G2).Set(Q[nbitsQ-1])
-   for i:=nbitsQ-1; i>0; i-- {
-      // TODO. bn256 doesn't export double operation. We will need to fork repo and export it
-      R = new(bn256.G2).Add(R,R)
-      R.Add(R,Q[i-1])
-   }
-   if Q_prev != nil {
-     return R.Add(R,Q_prev)
-   } else {
-     return R
-   }
+	// Perform bitwise addition
+	for j := 0; j < ntables-1; j++ {
+		table.newTableG2(a[j*gsize:(j+1)*gsize], gsize, false)
+		msb := getMsb(kExt[j*gsize : (j+1)*gsize])
+
+		for i := msb - 1; i >= 0; i-- {
+			b := getBit(kExt[j*gsize:(j+1)*gsize], i)
+			if b != 0 {
+				// TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
+				Q[i].Add(Q[i], table.data[b])
+			}
+		}
+	}
+	table.newTableG2(a[(ntables-1)*gsize:], gsize, false)
+	msb := getMsb(kExt[(ntables-1)*gsize:])
+
+	for i := msb - 1; i >= 0; i-- {
+		b := getBit(kExt[(ntables-1)*gsize:], i)
+		if b != 0 {
+			// TODO. bn256 doesn't export mixed addition (Jacobian + Affine), which is more efficient.
+			Q[i].Add(Q[i], table.data[b])
+		}
+	}
+
+	// Consolidate Addition
+	R := new(bn256.G2).Set(Q[nbitsQ-1])
+	for i := nbitsQ - 1; i > 0; i-- {
+		// TODO. bn256 doesn't export double operation. We will need to fork repo and export it
+		R = new(bn256.G2).Add(R, R)
+		R.Add(R, Q[i-1])
+	}
+	if qPrev != nil {
+		return R.Add(R, qPrev)
+	}
+	return R
 }

 // Return most significant bit position in a group of Big Integers
-func getMsb(k []*big.Int) int{
-  msb := 0
+func getMsb(k []*big.Int) int {
+	msb := 0

-  for _, el := range(k){
-     tmp_msb := el.BitLen()
-     if tmp_msb > msb {
-        msb = tmp_msb
-     }
-  }
-  return msb
+	for _, el := range k {
+		tmpMsb := el.BitLen()
+		if tmpMsb > msb {
+			msb = tmpMsb
+		}
+	}
+	return msb
 }

 // Return ith bit in group of Big Integers
 func getBit(k []*big.Int, i int) uint {
-   table_idx := uint(0)
+	tableIdx := uint(0)

-   for idx, el := range(k){
-     b := el.Bit(i)
-     table_idx += (b << idx)
-   }
-   return table_idx
+	for idx, el := range k {
+		b := el.Bit(i)
+		tableIdx += (b << idx)
+	}
+	return tableIdx
 }
--- a/prover/gextra_test.go
+++ b/prover/gextra_test.go
@@ -1,166 +1,163 @@
 package prover

 import (
+	"bytes"
 	"crypto/rand"
+	"fmt"
 	"math/big"
 	"testing"
+	"time"
+
 	bn256 "github.com/ethereum/go-ethereum/crypto/bn256/cloudflare"
-        "time"
-        "bytes"
-        "fmt"
 )

 const (
-       N1 = 5000
-       N2 = 5000
+	N1 = 5000
+	N2 = 5000
 )

-func randomBigIntArray(n int) []*big.Int{
+func randomBigIntArray(n int) []*big.Int {
 	var p []*big.Int
 	for i := 0; i < n; i++ {
 		pi := randBI()
 		p = append(p, pi)
 	}

-        return p
+	return p
 }

 func randomG1Array(n int) []*bn256.G1 {
-     arrayG1 := make([]*bn256.G1, n)
+	arrayG1 := make([]*bn256.G1, n)

-     for i:=0; i<n; i++ {
-       _, arrayG1[i], _ = bn256.RandomG1(rand.Reader)
-     }
-     return arrayG1
+	for i := 0; i < n; i++ {
+		_, arrayG1[i], _ = bn256.RandomG1(rand.Reader)
+	}
+	return arrayG1
 }

 func randomG2Array(n int) []*bn256.G2 {
-     arrayG2 := make([]*bn256.G2, n)
+	arrayG2 := make([]*bn256.G2, n)

-     for i:=0; i<n; i++ {
-       _, arrayG2[i], _ = bn256.RandomG2(rand.Reader)
-     }
-     return arrayG2
+	for i := 0; i < n; i++ {
+		_, arrayG2[i], _ = bn256.RandomG2(rand.Reader)
+	}
+	return arrayG2
 }

+func TestTableG1(t *testing.T) {
+	n := N1

+	// init scalar
+	var arrayW = randomBigIntArray(n)
+	// init G1 array
+	var arrayG1 = randomG1Array(n)

-func TestTableG1(t *testing.T){
-     n     := N1
+	beforeT := time.Now()
+	Q1 := new(bn256.G1).ScalarBaseMult(new(big.Int))
+	for i := 0; i < n; i++ {
+		Q1.Add(Q1, new(bn256.G1).ScalarMult(arrayG1[i], arrayW[i]))
+	}
+	fmt.Println("Std. Mult. time elapsed:", time.Since(beforeT))

-     // init scalar
-     var arrayW = randomBigIntArray(n)
-     // init G1 array
-     var arrayG1 = randomG1Array(n)
+	for gsize := 2; gsize < 10; gsize++ {
+		ntables := int((n + gsize - 1) / gsize)
+		table := make([]tableG1, ntables)

-     beforeT := time.Now()
-     Q1 := new(bn256.G1).ScalarBaseMult(new(big.Int))
-     for i:=0; i < n; i++ {
-         Q1.Add(Q1, new(bn256.G1).ScalarMult(arrayG1[i], arrayW[i]))
-     }
-     fmt.Println("Std. Mult. time elapsed:", time.Since(beforeT))
+		for i := 0; i < ntables-1; i++ {
+			table[i].newTableG1(arrayG1[i*gsize:(i+1)*gsize], gsize, true)
+		}
+		table[ntables-1].newTableG1(arrayG1[(ntables-1)*gsize:], gsize, true)

-     for gsize:=2; gsize < 10; gsize++ {
-        ntables := int((n + gsize - 1) / gsize)
-        table := make([]TableG1, ntables)
+		beforeT = time.Now()
+		Q2 := new(bn256.G1).ScalarBaseMult(new(big.Int))
+		for i := 0; i < ntables-1; i++ {
+			Q2 = table[i].mulTableG1(arrayW[i*gsize:(i+1)*gsize], Q2, gsize)
+		}
+		Q2 = table[ntables-1].mulTableG1(arrayW[(ntables-1)*gsize:], Q2, gsize)
+		fmt.Printf("Gsize : %d, TMult time elapsed: %s\n", gsize, time.Since(beforeT))

-        for i:=0; i<ntables-1; i++ {
-          table[i].NewTableG1( arrayG1[i*gsize:(i+1)*gsize], gsize)
-        }
-        table[ntables-1].NewTableG1( arrayG1[(ntables-1)*gsize:], gsize)
+		beforeT = time.Now()
+		Q3 := scalarMultG1(arrayG1, arrayW, nil, gsize)
+		fmt.Printf("Gsize : %d, TMult time elapsed (inc table comp): %s\n", gsize, time.Since(beforeT))

-        beforeT = time.Now()
-        Q2:= new(bn256.G1).ScalarBaseMult(new(big.Int))
-        for i:=0; i<ntables-1; i++ {
-           Q2 = table[i].MulTableG1(arrayW[i*gsize:(i+1)*gsize], Q2, gsize)
-        }
-        Q2 = table[ntables-1].MulTableG1(arrayW[(ntables-1)*gsize:], Q2, gsize)
-        fmt.Printf("Gsize : %d, TMult time elapsed: %s\n", gsize,time.Since(beforeT))
+		beforeT = time.Now()
+		Q4 := mulTableNoDoubleG1(table, arrayW, nil, gsize)
+		fmt.Printf("Gsize : %d, TMultNoDouble time elapsed: %s\n", gsize, time.Since(beforeT))

-        beforeT = time.Now()
-        Q3 := ScalarMultG1(arrayG1, arrayW, nil, gsize)
-        fmt.Printf("Gsize : %d, TMult time elapsed (inc table comp): %s\n", gsize,time.Since(beforeT))
+		beforeT = time.Now()
+		Q5 := scalarMultNoDoubleG1(arrayG1, arrayW, nil, gsize)
+		fmt.Printf("Gsize : %d, TMultNoDouble time elapsed (inc table comp): %s\n", gsize, time.Since(beforeT))

-        beforeT = time.Now()
-        Q4 := MulTableNoDoubleG1(table, arrayW, nil, gsize)
-        fmt.Printf("Gsize : %d, TMultNoDouble time elapsed: %s\n", gsize,time.Since(beforeT))
-
-        beforeT = time.Now()
-        Q5 := ScalarMultNoDoubleG1(arrayG1, arrayW, nil, gsize)
-        fmt.Printf("Gsize : %d, TMultNoDouble time elapsed (inc table comp): %s\n", gsize,time.Since(beforeT))
-
-
-        if bytes.Compare(Q1.Marshal(),Q2.Marshal()) != 0 {
-            t.Error("Error in TMult")
-        }
-        if bytes.Compare(Q1.Marshal(),Q3.Marshal()) != 0 {
-            t.Error("Error in  TMult with table comp")
-        }
-        if bytes.Compare(Q1.Marshal(),Q4.Marshal()) != 0 {
-            t.Error("Error in  TMultNoDouble")
-        }
-        if bytes.Compare(Q1.Marshal(),Q5.Marshal()) != 0 {
-            t.Error("Error in  TMultNoDoublee with table comp")
-        }
-    }
+		if bytes.Compare(Q1.Marshal(), Q2.Marshal()) != 0 {
+			t.Error("Error in TMult")
+		}
+		if bytes.Compare(Q1.Marshal(), Q3.Marshal()) != 0 {
+			t.Error("Error in  TMult with table comp")
+		}
+		if bytes.Compare(Q1.Marshal(), Q4.Marshal()) != 0 {
+			t.Error("Error in  TMultNoDouble")
+		}
+		if bytes.Compare(Q1.Marshal(), Q5.Marshal()) != 0 {
+			t.Error("Error in  TMultNoDoublee with table comp")
+		}
+	}
 }

-func TestTableG2(t *testing.T){
-     n     := N2
+func TestTableG2(t *testing.T) {
+	n := N2

-     // init scalar
-     var arrayW = randomBigIntArray(n)
-     // init G2 array
-     var arrayG2 = randomG2Array(n)
+	// init scalar
+	var arrayW = randomBigIntArray(n)
+	// init G2 array
+	var arrayG2 = randomG2Array(n)

-     beforeT := time.Now()
-     Q1 := new(bn256.G2).ScalarBaseMult(new(big.Int))
-     for i:=0; i < n; i++ {
-         Q1.Add(Q1, new(bn256.G2).ScalarMult(arrayG2[i], arrayW[i]))
-     }
-     fmt.Println("Std. Mult. time elapsed:", time.Since(beforeT))
+	beforeT := time.Now()
+	Q1 := new(bn256.G2).ScalarBaseMult(new(big.Int))
+	for i := 0; i < n; i++ {
+		Q1.Add(Q1, new(bn256.G2).ScalarMult(arrayG2[i], arrayW[i]))
+	}
+	fmt.Println("Std. Mult. time elapsed:", time.Since(beforeT))

-     for gsize:=2; gsize < 10; gsize++ {
-        ntables := int((n + gsize - 1) / gsize)
-        table := make([]TableG2, ntables)
+	for gsize := 2; gsize < 10; gsize++ {
+		ntables := int((n + gsize - 1) / gsize)
+		table := make([]tableG2, ntables)

-        for i:=0; i<ntables-1; i++ {
-          table[i].NewTableG2( arrayG2[i*gsize:(i+1)*gsize], gsize)
-        }
-        table[ntables-1].NewTableG2( arrayG2[(ntables-1)*gsize:], gsize)
+		for i := 0; i < ntables-1; i++ {
+			table[i].newTableG2(arrayG2[i*gsize:(i+1)*gsize], gsize, false)
+		}
+		table[ntables-1].newTableG2(arrayG2[(ntables-1)*gsize:], gsize, false)

-        beforeT = time.Now()
-        Q2:= new(bn256.G2).ScalarBaseMult(new(big.Int))
-        for i:=0; i<ntables-1; i++ {
-           Q2 =table[i].MulTableG2(arrayW[i*gsize:(i+1)*gsize], Q2, gsize)
-        }
-        Q2 = table[ntables-1].MulTableG2(arrayW[(ntables-1)*gsize:], Q2, gsize)
-        fmt.Printf("Gsize : %d, TMult time elapsed: %s\n", gsize,time.Since(beforeT))
+		beforeT = time.Now()
+		Q2 := new(bn256.G2).ScalarBaseMult(new(big.Int))
+		for i := 0; i < ntables-1; i++ {
+			Q2 = table[i].mulTableG2(arrayW[i*gsize:(i+1)*gsize], Q2, gsize)
+		}
+		Q2 = table[ntables-1].mulTableG2(arrayW[(ntables-1)*gsize:], Q2, gsize)
+		fmt.Printf("Gsize : %d, TMult time elapsed: %s\n", gsize, time.Since(beforeT))

-        beforeT = time.Now()
-        Q3 := ScalarMultG2(arrayG2, arrayW, nil, gsize)
-        fmt.Printf("Gsize : %d, TMult time elapsed (inc table comp): %s\n", gsize,time.Since(beforeT))
+		beforeT = time.Now()
+		Q3 := scalarMultG2(arrayG2, arrayW, nil, gsize)
+		fmt.Printf("Gsize : %d, TMult time elapsed (inc table comp): %s\n", gsize, time.Since(beforeT))

-        beforeT = time.Now()
-        Q4 := MulTableNoDoubleG2(table, arrayW, nil, gsize)
-        fmt.Printf("Gsize : %d, TMultNoDouble time elapsed: %s\n", gsize,time.Since(beforeT))
+		beforeT = time.Now()
+		Q4 := mulTableNoDoubleG2(table, arrayW, nil, gsize)
+		fmt.Printf("Gsize : %d, TMultNoDouble time elapsed: %s\n", gsize, time.Since(beforeT))

-        beforeT = time.Now()
-        Q5 := ScalarMultNoDoubleG2(arrayG2, arrayW, nil, gsize)
-        fmt.Printf("Gsize : %d, TMultNoDouble time elapsed (inc table comp): %s\n", gsize,time.Since(beforeT))
+		beforeT = time.Now()
+		Q5 := scalarMultNoDoubleG2(arrayG2, arrayW, nil, gsize)
+		fmt.Printf("Gsize : %d, TMultNoDouble time elapsed (inc table comp): %s\n", gsize, time.Since(beforeT))

-
-        if bytes.Compare(Q1.Marshal(),Q2.Marshal()) != 0 {
-            t.Error("Error in TMult")
-        }
-        if bytes.Compare(Q1.Marshal(),Q3.Marshal()) != 0 {
-            t.Error("Error in  TMult with table comp")
-        }
-        if bytes.Compare(Q1.Marshal(),Q4.Marshal()) != 0 {
-            t.Error("Error in  TMultNoDouble")
-        }
-        if bytes.Compare(Q1.Marshal(),Q5.Marshal()) != 0 {
-            t.Error("Error in  TMultNoDoublee with table comp")
-        }
-    }
+		if bytes.Compare(Q1.Marshal(), Q2.Marshal()) != 0 {
+			t.Error("Error in TMult")
+		}
+		if bytes.Compare(Q1.Marshal(), Q3.Marshal()) != 0 {
+			t.Error("Error in  TMult with table comp")
+		}
+		if bytes.Compare(Q1.Marshal(), Q4.Marshal()) != 0 {
+			t.Error("Error in  TMultNoDouble")
+		}
+		if bytes.Compare(Q1.Marshal(), Q5.Marshal()) != 0 {
+			t.Error("Error in  TMultNoDoublee with table comp")
+		}
+	}
 }
--- a/prover/prover.go
+++ b/prover/prover.go
@@ -10,7 +10,7 @@ import (
 	bn256 "github.com/ethereum/go-ethereum/crypto/bn256/cloudflare"
 	"github.com/iden3/go-circom-prover-verifier/types"
 	"github.com/iden3/go-iden3-crypto/utils"
-        //"fmt"
+	//"fmt"
 )

 // Proof is the data structure of the Groth16 zkSNARK proof
@@ -45,7 +45,7 @@ type Witness []*big.Int

 // Group Size
 const (
-    GSIZE = 6
+	GSIZE = 6
 )

 func randBigInt() (*big.Int, error) {
@@ -81,34 +81,34 @@ func GenerateProof(pk *types.Pk, w types.Witness) (*types.Proof, []*big.Int, err
 	proofB := arrayOfZeroesG2(numcpu)
 	proofC := arrayOfZeroesG1(numcpu)
 	proofBG1 := arrayOfZeroesG1(numcpu)
-        gsize := GSIZE
+	gsize := GSIZE
 	var wg1 sync.WaitGroup
 	wg1.Add(numcpu)
 	for _cpu, _ranges := range ranges(pk.NVars, numcpu) {
 		// split 1
 		go func(cpu int, ranges [2]int) {
-                        proofA[cpu] = ScalarMultNoDoubleG1(pk.A[ranges[0]:ranges[1]],
-                                                           w[ranges[0]:ranges[1]],
-                                                           proofA[cpu],
-                                                           gsize)
-                        proofB[cpu] = ScalarMultNoDoubleG2(pk.B2[ranges[0]:ranges[1]],
-                                                           w[ranges[0]:ranges[1]],
-                                                           proofB[cpu],
-                                                           gsize)
-                        proofBG1[cpu] = ScalarMultNoDoubleG1(pk.B1[ranges[0]:ranges[1]],
-                                                           w[ranges[0]:ranges[1]],
-                                                           proofBG1[cpu],
-                                                           gsize)
-                        min_lim := pk.NPublic+1
-                        if ranges[0] > pk.NPublic+1 {
-                           min_lim = ranges[0]
-                        }
-                        if ranges[1] > pk.NPublic + 1 {
-                            proofC[cpu] = ScalarMultNoDoubleG1(pk.C[min_lim:ranges[1]],
-                                                           w[min_lim:ranges[1]],
-                                                           proofC[cpu],
-                                                           gsize)
-                        }
+			proofA[cpu] = scalarMultNoDoubleG1(pk.A[ranges[0]:ranges[1]],
+				w[ranges[0]:ranges[1]],
+				proofA[cpu],
+				gsize)
+			proofB[cpu] = scalarMultNoDoubleG2(pk.B2[ranges[0]:ranges[1]],
+				w[ranges[0]:ranges[1]],
+				proofB[cpu],
+				gsize)
+			proofBG1[cpu] = scalarMultNoDoubleG1(pk.B1[ranges[0]:ranges[1]],
+				w[ranges[0]:ranges[1]],
+				proofBG1[cpu],
+				gsize)
+			minLim := pk.NPublic + 1
+			if ranges[0] > pk.NPublic+1 {
+				minLim = ranges[0]
+			}
+			if ranges[1] > pk.NPublic+1 {
+				proofC[cpu] = scalarMultNoDoubleG1(pk.C[minLim:ranges[1]],
+					w[minLim:ranges[1]],
+					proofC[cpu],
+					gsize)
+			}
 			wg1.Done()
 		}(_cpu, _ranges)
 	}
@@ -142,10 +142,10 @@ func GenerateProof(pk *types.Pk, w types.Witness) (*types.Proof, []*big.Int, err
 	for _cpu, _ranges := range ranges(len(h), numcpu) {
 		// split 2
 		go func(cpu int, ranges [2]int) {
-                        proofC[cpu] = ScalarMultNoDoubleG1(pk.HExps[ranges[0]:ranges[1]],
-                                                           h[ranges[0]:ranges[1]],
-                                                           proofC[cpu],
-                                                           gsize)
+			proofC[cpu] = scalarMultNoDoubleG1(pk.HExps[ranges[0]:ranges[1]],
+				h[ranges[0]:ranges[1]],
+				proofC[cpu],
+				gsize)
 			wg2.Done()
 		}(_cpu, _ranges)
 	}
--- a/prover/prover_test.go
+++ b/prover/prover_test.go
@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"os"
 	"testing"
 	"time"

@@ -16,25 +17,38 @@ import (
 func TestCircuitsGenerateProof(t *testing.T) {
 	testCircuitGenerateProof(t, "circuit1k") // 1000 constraints
 	testCircuitGenerateProof(t, "circuit5k") // 5000 constraints
-        //testCircuitGenerateProof(t, "circuit10k") // 10000 constraints
-        //testCircuitGenerateProof(t, "circuit20k") // 20000 constraints
+	// testCircuitGenerateProof(t, "circuit10k") // 10000 constraints
+	// testCircuitGenerateProof(t, "circuit20k") // 20000 constraints
 }

 func testCircuitGenerateProof(t *testing.T, circuit string) {
-	provingKeyJson, err := ioutil.ReadFile("../testdata/" + circuit + "/proving_key.json")
+	// using json provingKey file
+	// provingKeyJson, err := ioutil.ReadFile("../testdata/" + circuit + "/proving_key.json")
+	// require.Nil(t, err)
+	// pk, err := parsers.ParsePk(provingKeyJson)
+	// require.Nil(t, err)
+	// witnessJson, err := ioutil.ReadFile("../testdata/" + circuit + "/witness.json")
+	// require.Nil(t, err)
+	// w, err := parsers.ParseWitness(witnessJson)
+	// require.Nil(t, err)
+
+	// using bin provingKey file
+	pkBinFile, err := os.Open("../testdata/" + circuit + "/proving_key.bin")
 	require.Nil(t, err)
-	pk, err := parsers.ParsePk(provingKeyJson)
+	defer pkBinFile.Close()
+	pk, err := parsers.ParsePkBin(pkBinFile)
 	require.Nil(t, err)

-	witnessJson, err := ioutil.ReadFile("../testdata/" + circuit + "/witness.json")
+	witnessBinFile, err := os.Open("../testdata/" + circuit + "/witness.bin")
 	require.Nil(t, err)
-	w, err := parsers.ParseWitness(witnessJson)
+	defer witnessBinFile.Close()
+	w, err := parsers.ParseWitnessBin(witnessBinFile)
 	require.Nil(t, err)

 	beforeT := time.Now()
 	proof, pubSignals, err := GenerateProof(pk, w)
 	assert.Nil(t, err)
-	fmt.Println("proof generation time elapsed:", time.Since(beforeT))
+	fmt.Println("proof generation time for "+circuit+" elapsed:", time.Since(beforeT))

 	proofStr, err := parsers.ProofToJson(proof)
 	assert.Nil(t, err)
--- a/prover/tables.md
+++ b/prover/tables.md
@@ -16,7 +16,7 @@ There may be some concern on the additional size of the tables since they need t


 | Algorithm (G1) | GS 2 | GS 3 | GS 4 | GS 5 | GS 6 | GS 7 | GS 8 | GS 9 | 
-|---|---|---|---|---|---|---|---|---|
+|---|---|---|--|---|---|---|---|---|
 | Naive | 6.63s | - | - | - | - | - |  - | - |
 | Strauss |  13.16s | 9.03s | 6.95s | 5.61s | 4.91s | 4.26s | 3.88s | 3.54 s |
 | Strauss + Table Computation | 16.13s | 11.32s | 8.47s | 7.10s | 6.2s | 5.94s | 6.01s | 6.69s |
@@ -26,7 +26,7 @@ There may be some concern on the additional size of the tables since they need t
 There are 5000 G2 Elliptical Curve Points, and the scalars are 254 bits (BN256 curve). 

 | Algorithm (G2) | GS 2 | GS 3 | GS 4 | GS 5 | GS 6 | GS 7 | GS 8 | GS 9 | 
-|---|---|---|---|---|---|---|---|---|
+|---|---|---|--|---|---|---|---|---|
 | Naive | 3.55s | | | | | | | |
 | Strauss |  3.55s | 2.54s | 1.96s | 1.58s |  1.38s | 1.20s | 1.03s | 937ms |
 | Strauss + Table Computation | 3.59s | 2.58s | 2.04s | 1.71s | 1.51s | 1.46s | 1.51s | 1.82s |
--- a/tables.md
+++ b/tables.md
@@ -1,25 +0,0 @@
-# Tables Pre-calculation
-The most time consuming part of a ZKSnark proof calculation is the scalar multiplication of elliptic curve points. Direct mechanism accumulates each multiplication. However, prover only needs the total accumulation.
-
-There are two potential improvements to the naive approach:
-
-1. Apply Strauss-Shamir method (https://stackoverflow.com/questions/50993471/ec-scalar-multiplication-with-strauss-shamir-method).
-2. Leave the doubling operation for the last step
-
-Both options can be combined. 
-
-In the following table, we show the results of using the naive method, Srauss-Shamir and Strauss-Shamir + No doubling. These last two options are repeated for different table grouping order.
-
-There are 5000 G1 Elliptical Curve Points, and the scalars are 254 bits (BN256 curve). 
-
-There may be some concern on the additional size of the tables since they need to be loaded into a smartphone during the proof, and the time required to load these tables may exceed the benefits. If this is a problem, another althernative is to compute the tables during the proof itself. Depending on the Group Size, timing may be better than the naive approach.
-
-
-| Algorithm | GS / Time |
-|---|---|---|
-| Naive | 6.63s | | | | | | | |
-| Strauss |  13.16s | 9.033s | 6.95s | 5.61s | 4.91s | 4.26s | 3.88s | 3.54 s | 1.44 s |
-| Strauss + Table Computation | 16.13s | 11.32s | 8.47s | 7.10s | 6.2s | 5.94s | 6.01s | 6.69s |
-| No Doubling | 3.74s | 3.00s | 2.38s | 1.96s | 1.79s | 1.54s | 1.50s | 1.44s|
-| No Doubling + Table Computation  | 6.83s | 5.1s | 4.16s | 3.52s| 3.22s | 3.21s | 3.57s | 4.56s |
-
--- a/types/types.go
+++ b/types/types.go
@@ -6,6 +6,8 @@ import (
 	bn256 "github.com/ethereum/go-ethereum/crypto/bn256/cloudflare"
 )

+var Q, _ = new(big.Int).SetString("21888242871839275222246405745257275088696311157297823662689037894645226208583", 10)
+
 // R is the mod of the finite field
 var R, _ = new(big.Int).SetString("21888242871839275222246405745257275088548364400416034343698204186575808495617", 10)
Author	SHA1	Message	Date
arnaucube	5c2aaec1ca	Add ProvingKey binary parser The time on the parsing doesn't improve, as the data from the binary file needs to be converted to `affine` representation, and then parsed into the `bn256.G1` & `bn256.G2` formats (Montgomery). But the size of the ProvingKey files in binary is much smaller, so will be better handled by the smarthpones. - Parse time benchmarks: ``` BenchmarkParsePk/Parse_Pk_bin_circuit1k-4 2 563729994 ns/op BenchmarkParsePk/Parse_Pk_json_circuit1k-4 635641 1941 ns/op BenchmarkParsePk/Parse_Pk_bin_circuit5k-4 1 2637941658 ns/op BenchmarkParsePk/Parse_Pk_json_circuit5k-4 1 2986560185 ns/op BenchmarkParsePk/Parse_Pk_bin_circuit10k-4 1 5337639150 ns/op BenchmarkParsePk/Parse_Pk_json_circuit10k-4 1 6149568824 ns/op BenchmarkParsePk/Parse_Pk_bin_circuit20k-4 1 10533654623 ns/op BenchmarkParsePk/Parse_Pk_json_circuit20k-4 1 11657326851 ns/op ``` - Size of ProvingKey file for a circuit of 50k constraints: ``` circuit 20k constraints: 10097812 bytes of proving_key.bin 29760049 bytes of proving_key.json circuit 50k constraints: 24194964 bytes of proving_key.bin 71484081 bytes of proving_key.json ```	2020-05-20 12:25:27 +02:00
Eduard S	1aa316cbd2	Merge pull request #11 from iden3/feature/proof-parsers Add proof parsers to string (decimal & hex)	2020-05-07 12:15:08 +02:00
arnaucube	0f48cfa2a5	Add proof parsers to string (decimal & hex) Also adds ProofToSmartContractFormat, which returns a ProofString as the proof.B elements swap is not a valid point for the bn256.G2 format. Also unexports internal structs and methods of the prover package. Also apply golint.	2020-05-06 14:45:44 +02:00
Eduard S	6ec118d4e2	Merge pull request #10 from iden3/feature/tables2 Add G1/G2 table calculation functionality	2020-05-06 11:43:06 +02:00
druiz0992	423d5f0ce7	Add G1/G2 table calculation functionality	2020-05-06 09:27:15 +02:00