541 lines
20 KiB
JavaScript
541 lines
20 KiB
JavaScript
/* global artifacts, web3, contract */
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require('chai').use(require('bn-chai')(web3.utils.BN)).use(require('chai-as-promised')).should()
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const fs = require('fs')
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const { toBN, randomHex } = require('web3-utils')
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const { takeSnapshot, revertSnapshot } = require('../scripts/ganacheHelper')
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const Tornado = artifacts.require('./ETHTornado.sol')
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const { ETH_AMOUNT, MERKLE_TREE_HEIGHT } = process.env
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const websnarkUtils = require('websnark/src/utils')
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const buildGroth16 = require('websnark/src/groth16')
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const stringifyBigInts = require('websnark/tools/stringifybigint').stringifyBigInts
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const unstringifyBigInts2 = require('snarkjs/src/stringifybigint').unstringifyBigInts
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const snarkjs = require('snarkjs')
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const bigInt = snarkjs.bigInt
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const crypto = require('crypto')
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const circomlib = require('circomlib')
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const MerkleTree = require('fixed-merkle-tree')
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const rbigint = (nbytes) => snarkjs.bigInt.leBuff2int(crypto.randomBytes(nbytes))
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const pedersenHash = (data) => circomlib.babyJub.unpackPoint(circomlib.pedersenHash.hash(data))[0]
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const toFixedHex = (number, length = 32) =>
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'0x' +
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bigInt(number)
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.toString(16)
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.padStart(length * 2, '0')
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const getRandomRecipient = () => rbigint(20)
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function generateDeposit() {
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let deposit = {
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secret: rbigint(31),
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nullifier: rbigint(31),
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}
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const preimage = Buffer.concat([deposit.nullifier.leInt2Buff(31), deposit.secret.leInt2Buff(31)])
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deposit.commitment = pedersenHash(preimage)
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return deposit
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}
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// eslint-disable-next-line no-unused-vars
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function BNArrayToStringArray(array) {
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const arrayToPrint = []
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array.forEach((item) => {
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arrayToPrint.push(item.toString())
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})
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return arrayToPrint
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}
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function snarkVerify(proof) {
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proof = unstringifyBigInts2(proof)
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const verification_key = unstringifyBigInts2(require('../build/circuits/withdraw_verification_key.json'))
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return snarkjs['groth'].isValid(verification_key, proof, proof.publicSignals)
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}
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contract('ETHTornado', (accounts) => {
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let tornado
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const sender = accounts[0]
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const operator = accounts[0]
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const levels = MERKLE_TREE_HEIGHT || 16
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const value = ETH_AMOUNT || '1000000000000000000' // 1 ether
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let snapshotId
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let tree
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const fee = bigInt(ETH_AMOUNT).shr(1) || bigInt(1e17)
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const refund = bigInt(0)
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const recipient = getRandomRecipient()
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const relayer = accounts[1]
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let groth16
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let circuit
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let proving_key
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before(async () => {
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tree = new MerkleTree(levels)
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tornado = await Tornado.deployed()
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snapshotId = await takeSnapshot()
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groth16 = await buildGroth16()
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circuit = require('../build/circuits/withdraw.json')
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proving_key = fs.readFileSync('build/circuits/withdraw_proving_key.bin').buffer
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})
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describe('#constructor', () => {
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it('should initialize', async () => {
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const etherDenomination = await tornado.denomination()
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etherDenomination.should.be.eq.BN(toBN(value))
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})
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})
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describe('#deposit', () => {
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it('should emit event', async () => {
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let commitment = toFixedHex(42)
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let { logs } = await tornado.deposit(commitment, { value, from: sender })
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logs[0].event.should.be.equal('Deposit')
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logs[0].args.commitment.should.be.equal(commitment)
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logs[0].args.leafIndex.should.be.eq.BN(0)
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commitment = toFixedHex(12)
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;({ logs } = await tornado.deposit(commitment, { value, from: accounts[2] }))
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logs[0].event.should.be.equal('Deposit')
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logs[0].args.commitment.should.be.equal(commitment)
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logs[0].args.leafIndex.should.be.eq.BN(1)
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})
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it('should throw if there is a such commitment', async () => {
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const commitment = toFixedHex(42)
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await tornado.deposit(commitment, { value, from: sender }).should.be.fulfilled
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const error = await tornado.deposit(commitment, { value, from: sender }).should.be.rejected
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error.reason.should.be.equal('The commitment has been submitted')
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})
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})
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describe('snark proof verification on js side', () => {
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it('should detect tampering', async () => {
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const deposit = generateDeposit()
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tree.insert(deposit.commitment)
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const { pathElements, pathIndices } = tree.path(0)
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const input = stringifyBigInts({
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root: tree.root(),
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nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
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nullifier: deposit.nullifier,
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relayer: operator,
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recipient,
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fee,
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refund,
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secret: deposit.secret,
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pathElements: pathElements,
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pathIndices: pathIndices,
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})
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let proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const originalProof = JSON.parse(JSON.stringify(proofData))
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let result = snarkVerify(proofData)
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result.should.be.equal(true)
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// nullifier
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proofData.publicSignals[1] =
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'133792158246920651341275668520530514036799294649489851421007411546007850802'
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result = snarkVerify(proofData)
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result.should.be.equal(false)
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proofData = originalProof
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// try to cheat with recipient
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proofData.publicSignals[2] = '133738360804642228759657445999390850076318544422'
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result = snarkVerify(proofData)
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result.should.be.equal(false)
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proofData = originalProof
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// fee
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proofData.publicSignals[3] = '1337100000000000000000'
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result = snarkVerify(proofData)
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result.should.be.equal(false)
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proofData = originalProof
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})
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})
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describe('#withdraw', () => {
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it('should work', async () => {
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const deposit = generateDeposit()
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const user = accounts[4]
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tree.insert(deposit.commitment)
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const balanceUserBefore = await web3.eth.getBalance(user)
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// Uncomment to measure gas usage
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// let gas = await tornado.deposit.estimateGas(toBN(deposit.commitment.toString()), { value, from: user, gasPrice: '0' })
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// console.log('deposit gas:', gas)
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await tornado.deposit(toFixedHex(deposit.commitment), { value, from: user, gasPrice: '0' })
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const balanceUserAfter = await web3.eth.getBalance(user)
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balanceUserAfter.should.be.eq.BN(toBN(balanceUserBefore).sub(toBN(value)))
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const { pathElements, pathIndices } = tree.path(0)
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// Circuit input
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const input = stringifyBigInts({
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// public
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root: tree.root(),
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nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
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relayer: operator,
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recipient,
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fee,
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refund,
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// private
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nullifier: deposit.nullifier,
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secret: deposit.secret,
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pathElements: pathElements,
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pathIndices: pathIndices,
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})
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { proof } = websnarkUtils.toSolidityInput(proofData)
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const balanceTornadoBefore = await web3.eth.getBalance(tornado.address)
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const balanceRelayerBefore = await web3.eth.getBalance(relayer)
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const balanceOperatorBefore = await web3.eth.getBalance(operator)
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const balanceRecieverBefore = await web3.eth.getBalance(toFixedHex(recipient, 20))
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let isSpent = await tornado.isSpent(toFixedHex(input.nullifierHash))
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isSpent.should.be.equal(false)
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// Uncomment to measure gas usage
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// gas = await tornado.withdraw.estimateGas(proof, publicSignals, { from: relayer, gasPrice: '0' })
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// console.log('withdraw gas:', gas)
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const args = [
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toFixedHex(input.root),
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toFixedHex(input.nullifierHash),
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toFixedHex(input.recipient, 20),
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toFixedHex(input.relayer, 20),
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toFixedHex(input.fee),
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toFixedHex(input.refund),
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]
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const { logs } = await tornado.withdraw(proof, ...args, { from: relayer, gasPrice: '0' })
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const balanceTornadoAfter = await web3.eth.getBalance(tornado.address)
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const balanceRelayerAfter = await web3.eth.getBalance(relayer)
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const balanceOperatorAfter = await web3.eth.getBalance(operator)
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const balanceRecieverAfter = await web3.eth.getBalance(toFixedHex(recipient, 20))
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const feeBN = toBN(fee.toString())
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balanceTornadoAfter.should.be.eq.BN(toBN(balanceTornadoBefore).sub(toBN(value)))
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balanceRelayerAfter.should.be.eq.BN(toBN(balanceRelayerBefore))
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balanceOperatorAfter.should.be.eq.BN(toBN(balanceOperatorBefore).add(feeBN))
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balanceRecieverAfter.should.be.eq.BN(toBN(balanceRecieverBefore).add(toBN(value)).sub(feeBN))
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logs[0].event.should.be.equal('Withdrawal')
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logs[0].args.nullifierHash.should.be.equal(toFixedHex(input.nullifierHash))
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logs[0].args.relayer.should.be.eq.BN(operator)
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logs[0].args.fee.should.be.eq.BN(feeBN)
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isSpent = await tornado.isSpent(toFixedHex(input.nullifierHash))
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isSpent.should.be.equal(true)
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})
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it('should prevent double spend', async () => {
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const deposit = generateDeposit()
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tree.insert(deposit.commitment)
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await tornado.deposit(toFixedHex(deposit.commitment), { value, from: sender })
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const { pathElements, pathIndices } = tree.path(0)
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const input = stringifyBigInts({
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root: tree.root(),
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nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
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nullifier: deposit.nullifier,
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relayer: operator,
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recipient,
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fee,
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refund,
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secret: deposit.secret,
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pathElements: pathElements,
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pathIndices: pathIndices,
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})
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { proof } = websnarkUtils.toSolidityInput(proofData)
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const args = [
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toFixedHex(input.root),
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toFixedHex(input.nullifierHash),
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toFixedHex(input.recipient, 20),
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toFixedHex(input.relayer, 20),
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toFixedHex(input.fee),
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toFixedHex(input.refund),
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]
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await tornado.withdraw(proof, ...args, { from: relayer }).should.be.fulfilled
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const error = await tornado.withdraw(proof, ...args, { from: relayer }).should.be.rejected
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error.reason.should.be.equal('The note has been already spent')
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})
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it('should prevent double spend with overflow', async () => {
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const deposit = generateDeposit()
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tree.insert(deposit.commitment)
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await tornado.deposit(toFixedHex(deposit.commitment), { value, from: sender })
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const { pathElements, pathIndices } = tree.path(0)
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const input = stringifyBigInts({
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root: tree.root(),
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nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
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nullifier: deposit.nullifier,
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relayer: operator,
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recipient,
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fee,
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refund,
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secret: deposit.secret,
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pathElements: pathElements,
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pathIndices: pathIndices,
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})
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { proof } = websnarkUtils.toSolidityInput(proofData)
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const args = [
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toFixedHex(input.root),
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toFixedHex(
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toBN(input.nullifierHash).add(
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toBN('21888242871839275222246405745257275088548364400416034343698204186575808495617'),
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),
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),
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toFixedHex(input.recipient, 20),
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toFixedHex(input.relayer, 20),
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toFixedHex(input.fee),
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toFixedHex(input.refund),
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]
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const error = await tornado.withdraw(proof, ...args, { from: relayer }).should.be.rejected
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error.reason.should.be.equal('verifier-gte-snark-scalar-field')
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})
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it('fee should be less or equal transfer value', async () => {
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const deposit = generateDeposit()
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tree.insert(deposit.commitment)
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await tornado.deposit(toFixedHex(deposit.commitment), { value, from: sender })
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const { pathElements, pathIndices } = tree.path(0)
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const largeFee = bigInt(value).add(bigInt(1))
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const input = stringifyBigInts({
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root: tree.root(),
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nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
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nullifier: deposit.nullifier,
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relayer: operator,
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recipient,
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fee: largeFee,
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refund,
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secret: deposit.secret,
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pathElements: pathElements,
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pathIndices: pathIndices,
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})
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { proof } = websnarkUtils.toSolidityInput(proofData)
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const args = [
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toFixedHex(input.root),
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toFixedHex(input.nullifierHash),
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toFixedHex(input.recipient, 20),
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toFixedHex(input.relayer, 20),
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toFixedHex(input.fee),
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toFixedHex(input.refund),
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]
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const error = await tornado.withdraw(proof, ...args, { from: relayer }).should.be.rejected
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error.reason.should.be.equal('Fee exceeds transfer value')
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})
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it('should throw for corrupted merkle tree root', async () => {
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const deposit = generateDeposit()
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tree.insert(deposit.commitment)
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await tornado.deposit(toFixedHex(deposit.commitment), { value, from: sender })
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const { pathElements, pathIndices } = tree.path(0)
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const input = stringifyBigInts({
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nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
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root: tree.root(),
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nullifier: deposit.nullifier,
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relayer: operator,
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recipient,
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fee,
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refund,
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secret: deposit.secret,
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pathElements: pathElements,
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pathIndices: pathIndices,
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})
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { proof } = websnarkUtils.toSolidityInput(proofData)
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const args = [
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toFixedHex(randomHex(32)),
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toFixedHex(input.nullifierHash),
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toFixedHex(input.recipient, 20),
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toFixedHex(input.relayer, 20),
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toFixedHex(input.fee),
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toFixedHex(input.refund),
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]
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const error = await tornado.withdraw(proof, ...args, { from: relayer }).should.be.rejected
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error.reason.should.be.equal('Cannot find your merkle root')
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})
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it('should reject with tampered public inputs', async () => {
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const deposit = generateDeposit()
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tree.insert(deposit.commitment)
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await tornado.deposit(toFixedHex(deposit.commitment), { value, from: sender })
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let { pathElements, pathIndices } = tree.path(0)
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const input = stringifyBigInts({
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root: tree.root(),
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nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
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nullifier: deposit.nullifier,
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relayer: operator,
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recipient,
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fee,
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refund,
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secret: deposit.secret,
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pathElements: pathElements,
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pathIndices: pathIndices,
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})
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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let { proof } = websnarkUtils.toSolidityInput(proofData)
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const args = [
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toFixedHex(input.root),
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toFixedHex(input.nullifierHash),
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toFixedHex(input.recipient, 20),
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toFixedHex(input.relayer, 20),
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toFixedHex(input.fee),
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toFixedHex(input.refund),
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]
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let incorrectArgs
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const originalProof = proof.slice()
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// recipient
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incorrectArgs = [
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toFixedHex(input.root),
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toFixedHex(input.nullifierHash),
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toFixedHex('0x0000000000000000000000007a1f9131357404ef86d7c38dbffed2da70321337', 20),
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toFixedHex(input.relayer, 20),
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toFixedHex(input.fee),
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toFixedHex(input.refund),
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]
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let error = await tornado.withdraw(proof, ...incorrectArgs, { from: relayer }).should.be.rejected
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error.reason.should.be.equal('Invalid withdraw proof')
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// fee
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incorrectArgs = [
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toFixedHex(input.root),
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toFixedHex(input.nullifierHash),
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toFixedHex(input.recipient, 20),
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toFixedHex(input.relayer, 20),
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toFixedHex('0x000000000000000000000000000000000000000000000000015345785d8a0000'),
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toFixedHex(input.refund),
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]
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error = await tornado.withdraw(proof, ...incorrectArgs, { from: relayer }).should.be.rejected
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error.reason.should.be.equal('Invalid withdraw proof')
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// nullifier
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incorrectArgs = [
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toFixedHex(input.root),
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toFixedHex('0x00abdfc78211f8807b9c6504a6e537e71b8788b2f529a95f1399ce124a8642ad'),
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toFixedHex(input.recipient, 20),
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toFixedHex(input.relayer, 20),
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toFixedHex(input.fee),
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toFixedHex(input.refund),
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]
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error = await tornado.withdraw(proof, ...incorrectArgs, { from: relayer }).should.be.rejected
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error.reason.should.be.equal('Invalid withdraw proof')
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// proof itself
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proof = '0xbeef' + proof.substr(6)
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await tornado.withdraw(proof, ...args, { from: relayer }).should.be.rejected
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// should work with original values
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await tornado.withdraw(originalProof, ...args, { from: relayer }).should.be.fulfilled
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})
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it('should reject with non zero refund', async () => {
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const deposit = generateDeposit()
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tree.insert(deposit.commitment)
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await tornado.deposit(toFixedHex(deposit.commitment), { value, from: sender })
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const { pathElements, pathIndices } = tree.path(0)
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const input = stringifyBigInts({
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nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
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root: tree.root(),
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nullifier: deposit.nullifier,
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relayer: operator,
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recipient,
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fee,
|
|
refund: bigInt(1),
|
|
secret: deposit.secret,
|
|
pathElements: pathElements,
|
|
pathIndices: pathIndices,
|
|
})
|
|
|
|
const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
|
|
const { proof } = websnarkUtils.toSolidityInput(proofData)
|
|
|
|
const args = [
|
|
toFixedHex(input.root),
|
|
toFixedHex(input.nullifierHash),
|
|
toFixedHex(input.recipient, 20),
|
|
toFixedHex(input.relayer, 20),
|
|
toFixedHex(input.fee),
|
|
toFixedHex(input.refund),
|
|
]
|
|
const error = await tornado.withdraw(proof, ...args, { from: relayer }).should.be.rejected
|
|
error.reason.should.be.equal('Refund value is supposed to be zero for ETH instance')
|
|
})
|
|
})
|
|
|
|
describe('#isSpent', () => {
|
|
it('should work', async () => {
|
|
const deposit1 = generateDeposit()
|
|
const deposit2 = generateDeposit()
|
|
tree.insert(deposit1.commitment)
|
|
tree.insert(deposit2.commitment)
|
|
await tornado.deposit(toFixedHex(deposit1.commitment), { value, gasPrice: '0' })
|
|
await tornado.deposit(toFixedHex(deposit2.commitment), { value, gasPrice: '0' })
|
|
|
|
const { pathElements, pathIndices } = tree.path(1)
|
|
|
|
// Circuit input
|
|
const input = stringifyBigInts({
|
|
// public
|
|
root: tree.root(),
|
|
nullifierHash: pedersenHash(deposit2.nullifier.leInt2Buff(31)),
|
|
relayer: operator,
|
|
recipient,
|
|
fee,
|
|
refund,
|
|
|
|
// private
|
|
nullifier: deposit2.nullifier,
|
|
secret: deposit2.secret,
|
|
pathElements: pathElements,
|
|
pathIndices: pathIndices,
|
|
})
|
|
|
|
const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
|
|
const { proof } = websnarkUtils.toSolidityInput(proofData)
|
|
|
|
const args = [
|
|
toFixedHex(input.root),
|
|
toFixedHex(input.nullifierHash),
|
|
toFixedHex(input.recipient, 20),
|
|
toFixedHex(input.relayer, 20),
|
|
toFixedHex(input.fee),
|
|
toFixedHex(input.refund),
|
|
]
|
|
|
|
await tornado.withdraw(proof, ...args, { from: relayer, gasPrice: '0' })
|
|
|
|
const nullifierHash1 = toFixedHex(pedersenHash(deposit1.nullifier.leInt2Buff(31)))
|
|
const nullifierHash2 = toFixedHex(pedersenHash(deposit2.nullifier.leInt2Buff(31)))
|
|
const spentArray = await tornado.isSpentArray([nullifierHash1, nullifierHash2])
|
|
spentArray.should.be.deep.equal([false, true])
|
|
})
|
|
})
|
|
|
|
afterEach(async () => {
|
|
await revertSnapshot(snapshotId.result)
|
|
// eslint-disable-next-line require-atomic-updates
|
|
snapshotId = await takeSnapshot()
|
|
tree = new MerkleTree(levels)
|
|
})
|
|
})
|