Add bn256.G1 & G2 parsers

README.md

@@ -0,0 +1,6 @@
+# go-bellman-verifier
+
+Groth16 zkSnark bellman proof verifier
+
+- Verify proofs generated from [bellman](https://github.com/zkcrypto/bellman)
+- Using [cloudflare/bn256](https://github.com/cloudflare/bn256) for the Pairing.

go.mod

@@ -0,0 +1,8 @@
+module bellmanverifier
+
+go 1.12
+
+require (
+	github.com/ethereum/go-ethereum v1.9.11
+	github.com/stretchr/testify v1.4.0
+)

go.sum

@@ -0,0 +1,146 @@
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verifier.go

@@ -0,0 +1,73 @@
+package bellmanverifier
+
+import (
+	"bytes"
+	"encoding/hex"
+	"fmt"
+	"math/big"
+	"strings"
+
+	bn256 "github.com/ethereum/go-ethereum/crypto/bn256/cloudflare"
+)
+
+func hexToG1(h []string) (*bn256.G1, error) {
+	in := ""
+	for i := range h {
+		in += strings.TrimPrefix(h[i], "0x")
+	}
+
+	b, err := hex.DecodeString(in)
+	if err != nil {
+		return nil, err
+	}
+	p := new(bn256.G1)
+	_, err = p.Unmarshal(b)
+
+	return p, err
+}
+
+func hexToG2Regular(h [][]string) (*bn256.G2, error) {
+	in := ""
+	for i := 0; i < len(h); i++ {
+		for j := 0; j < len(h[i]); j++ {
+			in += strings.TrimPrefix(h[i][j], "0x")
+		}
+	}
+
+	b, err := hex.DecodeString(in)
+	if err != nil {
+		return nil, err
+	}
+	p := new(bn256.G2)
+	_, err = p.Unmarshal(b)
+	return p, err
+}
+
+func hexToG2(h [][]string) (*bn256.G2, error) {
+	in := ""
+	in += strings.TrimPrefix(h[0][1], "0x") // note that values are switched
+	in += strings.TrimPrefix(h[0][0], "0x")
+	in += strings.TrimPrefix(h[1][1], "0x")
+	in += strings.TrimPrefix(h[1][0], "0x")
+
+	b, err := hex.DecodeString(in)
+	if err != nil {
+		return nil, err
+	}
+	p := new(bn256.G2)
+	_, err = p.Unmarshal(b)
+	return p, err
+}
+
+func stringToBigInt(s string) *big.Int {
+	base := 10
+	if bytes.HasPrefix([]byte(s), []byte("0x")) {
+		base = 16
+		s = strings.TrimPrefix(s, "0x")
+	}
+	n, ok := new(big.Int).SetString(s, base)
+	if !ok {
+		panic(fmt.Errorf("Can not parse string to *big.Int: %s", s))
+	}
+	return n
+}

verifier_test.go

@@ -0,0 +1,42 @@
+package bellmanverifier
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestParsePoints(t *testing.T) {
+	aHex := []string{"0x2cdfab288afda1ba399d60951423e76445754b7d2e7827634732988373c8e0ff", "0x1bb2e3543dfdd373610db3ea82703bc70e4d6f01b5c0e10709e27545670824f4"}
+	a, err := hexToG1(aHex)
+	assert.Nil(t, err)
+	assert.Equal(t, "bn256.G1(2cdfab288afda1ba399d60951423e76445754b7d2e7827634732988373c8e0ff, 1bb2e3543dfdd373610db3ea82703bc70e4d6f01b5c0e10709e27545670824f4)", a.String())
+
+	bHex := [][]string{
+		[]string{
+			"0x0f9cd75cae408d3b6d2731035dbb6aa6f66cf900c1d64b46510cbbcd7cf94f64",
+			"0x165997362d7c2bf5672d16206fbee620ad8eb54f609b98c49c7c6287c9979077",
+		},
+		[]string{
+			"0x0392982b7cd7bdbbee79d5f808c67ead8ef3e2347810b546b419da5f738aab92",
+			"0x0f94d6781b9de113b86abd1930accd2260d0c979d520bc1a0e79dec3c8ce76a3",
+		},
+	}
+	b, err := hexToG2(bHex)
+	assert.Nil(t, err)
+	assert.Equal(t, "bn256.G2((165997362d7c2bf5672d16206fbee620ad8eb54f609b98c49c7c6287c9979077, 0f9cd75cae408d3b6d2731035dbb6aa6f66cf900c1d64b46510cbbcd7cf94f64), (0f94d6781b9de113b86abd1930accd2260d0c979d520bc1a0e79dec3c8ce76a3, 0392982b7cd7bdbbee79d5f808c67ead8ef3e2347810b546b419da5f738aab92))", b.String())
+
+	gHex := [][]string{
+		[]string{
+			"0x2d0c4fa1239184802aeda1f206e49104940aa3eccc1b3e0141c25b2dba8e7caf",
+			"0x15c9b1123841897787badbe858eb00943fc8a99454666f21acf4e79e13547471",
+		},
+		[]string{
+			"0x256ad09ecb0abc15fd48f20c37d28ffcf0f8eb3b23cb10cdeee7365b598963ac",
+			"0x2bc9bc381cf68badd992338c637b36b54936b69cb8560eaf5a8cbe2c20ff8522",
+		},
+	}
+	g, err := hexToG2(gHex)
+	assert.Nil(t, err)
+	assert.Equal(t, "bn256.G2((15c9b1123841897787badbe858eb00943fc8a99454666f21acf4e79e13547471, 2d0c4fa1239184802aeda1f206e49104940aa3eccc1b3e0141c25b2dba8e7caf), (2bc9bc381cf68badd992338c637b36b54936b69cb8560eaf5a8cbe2c20ff8522, 256ad09ecb0abc15fd48f20c37d28ffcf0f8eb3b23cb10cdeee7365b598963ac))", g.String())
+}