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main.go
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main.go
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package main
import (
"bufio"
"fmt"
"log"
"math/big"
"os"
"strconv"
"strings"
"github.com/consensys/gnark-crypto/ecc"
"github.com/consensys/gnark/backend/groth16"
"github.com/consensys/gnark/frontend"
"github.com/consensys/gnark/frontend/cs/r1cs"
)
func main() {
stderr := log.New(os.Stderr, "", 0)
if len(os.Args) < 2 {
stderr.Println("Usage: xjsnark-gnark-prover <command> <args>")
os.Exit(1)
}
command := os.Args[1]
if command == "compile" {
if len(os.Args) < 4 {
stderr.Println("Usage: xjsnark-gnark-prover compile <xjsnark-arith-file> <output-gnark-circuit-file>")
os.Exit(1)
}
log.Print("Start Loading and compiling Xjsnark arith file")
circuit := newCircuitFromXjsnark(os.Args[2])
r1cs, err := frontend.Compile(ecc.BN254, r1cs.NewBuilder, circuit)
if err != nil {
panic(err)
}
log.Print("Load and compile Xjsnark arith file done")
f, err := os.Create(os.Args[3])
if err != nil {
panic(err)
}
defer f.Close()
fWriter := bufio.NewWriter(f)
fmt.Fprintf(fWriter, "%d\n", circuit.outputEnd)
defer fWriter.Flush()
r1cs.WriteTo(fWriter)
log.Print("Write gnark circuit done")
} else if command == "keygen" {
if len(os.Args) < 5 {
stderr.Println("Usage: xjsnark-gnark-prover keygen <gnark-circuit-file> <output-pkey-file> <output-vkey-file>")
os.Exit(1)
}
log.Print("Loading circuit start")
r1cs := groth16.NewCS(ecc.BN254)
f, err := os.Open(os.Args[2])
if err != nil {
panic(err)
}
defer f.Close()
// fReader := bufio.NewReader(f)
var unused string
_, _ = fmt.Fscanf(f, "%s\n", &unused)
_, err = r1cs.ReadFrom(f)
if err != nil {
panic(err)
}
log.Print("Loading circuit done")
log.Print("Generating pk and vk start")
pk, vk, err := groth16.Setup(r1cs)
log.Print("Generate pk and vk done")
log.Print("Writing pk")
fpk, err := os.Create(os.Args[3])
if err != nil {
panic(err)
}
defer fpk.Close()
fpkwriter := bufio.NewWriter(fpk)
pk.WriteRawTo(fpkwriter)
log.Print("Writing pk done")
log.Print("Writing vk")
fvk, err := os.Create(os.Args[4])
if err != nil {
panic(err)
}
defer fvk.Close()
vk.WriteRawTo(fvk)
log.Print("Writing vk done")
} else if command == "prove" {
if len(os.Args) < 6 {
stderr.Println("Usage: xjsnark-gnark-prover prove <gnark-circuit-file> <pkey-file> <witness> <output-proof>")
os.Exit(1)
}
log.Print("Loading circuit start")
r1cs := groth16.NewCS(ecc.BN254)
f, err := os.Open(os.Args[2])
if err != nil {
panic(err)
}
defer f.Close()
fReader := bufio.NewReaderSize(f, 4096000000)
var outputEnd uint
_, _ = fmt.Fscanf(fReader, "%d\n", &outputEnd)
_, err = r1cs.ReadFrom(fReader)
if err != nil {
panic(err)
}
log.Print("Loading circuit done")
log.Print("Loading pk")
fpk, err := os.Open(os.Args[3])
defer fpk.Close()
fpkReader := bufio.NewReader(fpk)
pk := groth16.NewProvingKey(ecc.BN254)
_, err = pk.UnsafeReadFrom(fpkReader)
log.Print("Loading pk done")
log.Print("Loading witness")
assignment := loadAssignment(os.Args[4], r1cs, outputEnd)
witness, err := frontend.NewWitness(assignment, ecc.BN254)
log.Print("Loading witness done")
log.Print("Proving")
proof, err := groth16.Prove(r1cs, pk, witness)
if err != nil {
panic(err)
}
log.Print("Prove done")
log.Print("Writing proof")
fp, err := os.Create(os.Args[5])
if err != nil {
panic(err)
}
defer fp.Close()
proof.WriteTo(fp)
log.Print("Writing proof done")
} else if command == "verify" {
if len(os.Args) < 5 {
stderr.Println("Usage: xjsnark-gnark-prover verify <proof> <vk-file> <public-witness>")
os.Exit(1)
}
log.Print("Loading proof")
fp, err := os.Open(os.Args[2])
defer fp.Close()
proof := groth16.NewProof(ecc.BN254)
proof.ReadFrom(fp)
log.Print("Loading proof done")
log.Print("Loading vk")
fvk, err := os.Open(os.Args[3])
defer fvk.Close()
vk := groth16.NewVerifyingKey(ecc.BN254)
_, err = vk.ReadFrom(fvk)
log.Print("Loading vk done")
log.Print("Loading public assignment")
assignment := loadPublicAssignment(os.Args[4])
witness, err := frontend.NewWitness(assignment, ecc.BN254)
log.Print("Loading public assignment done")
publicWitness, _ := witness.Public()
err = groth16.Verify(proof, vk, publicWitness)
if err != nil {
panic(err)
}
log.Print("Verify done")
} else {
stderr.Println("Expected one of the following command: compile, keygen, prove, verify")
os.Exit(1)
}
}
type Circuit struct {
P []frontend.Variable `gnark:",public"`
S []frontend.Variable
outputEnd uint
Scanner *bufio.Scanner
totalVars uint
}
func (circuit *Circuit) Define(api frontend.API) error {
parseLibsnarkArith(circuit, api)
return nil
}
func sliceAtoi(sa []string) ([]int, error) {
si := make([]int, 0, len(sa))
for _, a := range sa {
i, err := strconv.Atoi(a)
if err != nil {
return si, err
}
si = append(si, i)
}
return si, nil
}
func newCircuitFromXjsnark(xjsnarkArithPath string) (circuit *Circuit) {
circuit = new(Circuit)
f, err := os.Open(xjsnarkArithPath)
if err != nil {
log.Fatal(err)
}
scanner := bufio.NewScanner(f)
circuit.Scanner = scanner
scanner.Scan()
line := scanner.Text()
n, _ := fmt.Sscanf(line, "total %d", &circuit.totalVars)
if n != 1 {
log.Fatal("File Format Does not Match, expect total n")
}
var nPublicInput, nSecretInput uint
for scanner.Scan() {
line = scanner.Text()
var id uint
n, _ = fmt.Sscanf(line, "input %d", &id)
if n == 1 {
nPublicInput++
continue
}
n, _ = fmt.Sscanf(line, "nizkinput %d", &id)
if n == 1 {
nSecretInput++
continue
}
// gnark does not support output, we record the ids and just log them in the end
n, _ = fmt.Sscanf(line, "output %d", &id)
if n == 1 {
circuit.outputEnd = id
continue
}
break
}
circuit.P = make([]frontend.Variable, nPublicInput)
circuit.S = make([]frontend.Variable, nSecretInput)
return
}
func parseLibsnarkArith(circuit *Circuit, api frontend.API) {
Vars := make([]frontend.Variable, circuit.totalVars)
scanner := circuit.Scanner
for i, p := range circuit.P {
Vars[i] = p
}
for i, s := range circuit.S {
Vars[i+len(circuit.P)] = s
}
for {
line := scanner.Text()
var t, inStr, outStr string
n, _ := fmt.Sscanf(line, "%s in %s out %s", &t, &inStr, &outStr)
if n == 3 {
inValues, err := sliceAtoi(strings.Split(inStr, "_"))
if err != nil {
log.Fatal(err)
}
outValues, err := sliceAtoi(strings.Split(outStr, "_"))
if err != nil {
log.Fatal(err)
}
if t == "add" {
var in []frontend.Variable
if len(inValues) > 2 {
in = make([]frontend.Variable, len(inValues)-2)
for i := 2; i < len(inValues); i++ {
in[i-2] = Vars[inValues[i]]
}
} else {
in = make([]frontend.Variable, 0)
}
Vars[outValues[0]] = api.Add(Vars[inValues[0]], Vars[inValues[1]], in...)
} else if t == "mul" {
Vars[outValues[0]] = api.Mul(Vars[inValues[0]], Vars[inValues[1]])
} else if strings.Contains(t, "const-mul-neg-") {
constStr := t[len("const-mul-neg-"):]
bi, success := new(big.Int).SetString(constStr, 16)
if !success {
log.Fatal("not a valid hex number")
}
Vars[outValues[0]] = api.Mul(api.Neg(bi), Vars[inValues[0]])
} else if strings.Contains(t, "const-mul-") {
constStr := t[len("const-mul-"):]
bi, success := new(big.Int).SetString(constStr, 16)
if !success {
log.Fatal("not a valid hex number. line:", line)
}
Vars[outValues[0]] = api.Mul(bi, Vars[inValues[0]])
} else if t == "assert" {
api.AssertIsEqual(api.Mul(Vars[inValues[0]], Vars[inValues[1]]), Vars[outValues[0]])
} else if t == "xor" {
Vars[outValues[0]] = api.Xor(api.IsZero(Vars[inValues[0]]), api.IsZero(Vars[inValues[1]]))
} else if t == "or" {
Vars[outValues[0]] = api.Or(api.IsZero(Vars[inValues[0]]), api.IsZero(Vars[inValues[1]]))
} else if t == "zerop" {
Vars[outValues[1]] = api.Sub(big.NewInt(1), api.IsZero(Vars[inValues[0]]))
} else if t == "split" {
l := len(outValues)
if l == 1 {
Vars[outValues[0]] = Vars[inValues[0]]
} else {
bits := api.ToBinary(Vars[inValues[0]], l)
for i, e := range bits {
Vars[outValues[i]] = e
}
}
} else if t == "pack" {
in := make([]frontend.Variable, len(inValues))
for i := 0; i < len(inValues); i++ {
in[i] = Vars[inValues[i]]
}
Vars[outValues[0]] = api.FromBinary(in...)
} else {
log.Fatal("Unknown opcode:", t)
}
} else {
log.Fatal("Arith file format invalid line:", line, "expected <opcode> in <input vars> out <output vars>")
}
if !scanner.Scan() {
break
}
}
if circuit.outputEnd != 0 {
outputStart := len(circuit.P) + len(circuit.S)
for i := outputStart; i <= int(circuit.outputEnd); i++ {
api.Println("Output", i, "=", Vars[i])
}
}
// For debug purpose, log all var
// for i := 0; i < int(circuit.totalVars); i++ {
// api.Println(i, Vars[i])
// }
if err := scanner.Err(); err != nil {
log.Fatal(err)
}
}
func loadAssignment(filename string, r1cs frontend.CompiledConstraintSystem, outputEnd uint) (ret *Circuit) {
f, err := os.Open(filename)
if err != nil {
panic(err)
}
ret = new(Circuit)
ret.outputEnd = outputEnd
_, nSecret, nPublic := r1cs.GetNbVariables()
log.Print(nPublic, nSecret)
ret.P = make([]frontend.Variable, nPublic-1)
ret.S = make([]frontend.Variable, nSecret)
var id int
var hex string
for {
n, _ := fmt.Fscanf(f, "%d %s\n", &id, &hex)
if n != 2 {
break
}
bi, success := new(big.Int).SetString(hex, 16)
if !success {
log.Fatal("not a valid hex number")
}
if id < len(ret.P) {
ret.P[id] = bi
} else if id < len(ret.P)+len(ret.S) {
ret.S[id-len(ret.P)] = bi
}
}
return
}
func loadPublicAssignment(filename string) (ret *Circuit) {
f, err := os.Open(filename)
if err != nil {
panic(err)
}
ret = new(Circuit)
ret.P = make([]frontend.Variable, 0)
var id int
var hex string
for {
n, _ := fmt.Fscanf(f, "%d %s\n", &id, &hex)
if n != 2 {
break
}
bi, success := new(big.Int).SetString(hex, 16)
if !success {
log.Fatal("not a valid hex number")
}
ret.P = append(ret.P, bi)
}
return
}