491 lines
18 KiB
JavaScript
491 lines
18 KiB
JavaScript
/* global artifacts, web3, contract */
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require('chai')
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.use(require('bn-chai')(web3.utils.BN))
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.use(require('chai-as-promised'))
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.should()
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const fs = require('fs')
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const { toBN, toHex, randomHex } = require('web3-utils')
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const { takeSnapshot, revertSnapshot } = require('../lib/ganacheHelper')
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const Mixer = artifacts.require('./ETHMixer.sol')
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const { ETH_AMOUNT, MERKLE_TREE_HEIGHT, EMPTY_ELEMENT } = 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('../lib/MerkleTree')
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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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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 getRandomReceiver() {
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let receiver = rbigint(20)
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while (toHex(receiver.toString()).length !== 42) {
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receiver = rbigint(20)
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}
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return receiver
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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('ETHMixer', accounts => {
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let mixer
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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 zeroValue = EMPTY_ELEMENT || 1337
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const value = ETH_AMOUNT || '1000000000000000000' // 1 ether
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let snapshotId
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let prefix = 'test'
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let tree
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const fee = bigInt(ETH_AMOUNT).shr(1) || bigInt(1e17)
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const receiver = getRandomReceiver()
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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(
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levels,
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zeroValue,
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null,
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prefix,
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)
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mixer = await Mixer.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 mixer.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 = 42
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let { logs } = await mixer.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.eq.BN(toBN(commitment))
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logs[0].args.leafIndex.should.be.eq.BN(toBN(0))
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commitment = 12;
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({ logs } = await mixer.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.eq.BN(toBN(commitment))
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logs[0].args.leafIndex.should.be.eq.BN(toBN(1))
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})
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it('should not deposit if disabled', async () => {
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let commitment = 42;
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(await mixer.isDepositsEnabled()).should.be.equal(true)
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const err = await mixer.toggleDeposits({ from: accounts[1] }).should.be.rejected
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err.reason.should.be.equal('Only operator can call this function.')
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await mixer.toggleDeposits({ from: sender });
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(await mixer.isDepositsEnabled()).should.be.equal(false)
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let error = await mixer.deposit(commitment, { value, from: sender }).should.be.rejected
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error.reason.should.be.equal('deposits are disabled')
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})
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it('should throw if there is a such commitment', async () => {
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const commitment = 42
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await mixer.deposit(commitment, { value, from: sender }).should.be.fulfilled
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const error = await mixer.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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await tree.insert(deposit.commitment)
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const { root, path_elements, path_index } = await tree.path(0)
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const input = stringifyBigInts({
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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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receiver,
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fee,
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secret: deposit.secret,
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pathElements: path_elements,
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pathIndex: path_index,
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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] = '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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await 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 mixer.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 mixer.deposit(toBN(deposit.commitment.toString()), { 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 { root, path_elements, path_index } = await 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,
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nullifierHash: pedersenHash(deposit.nullifier.leInt2Buff(31)),
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relayer: operator,
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receiver,
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fee,
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// private
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nullifier: deposit.nullifier,
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secret: deposit.secret,
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pathElements: path_elements,
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pathIndex: path_index,
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})
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { proof, publicSignals } = websnarkUtils.toSolidityInput(proofData)
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const balanceMixerBefore = await web3.eth.getBalance(mixer.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(toHex(receiver.toString()))
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let isSpent = await mixer.isSpent(input.nullifierHash.toString(16).padStart(66, '0x00000'))
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isSpent.should.be.equal(false)
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// Uncomment to measure gas usage
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// gas = await mixer.withdraw.estimateGas(proof, publicSignals, { from: relayer, gasPrice: '0' })
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// console.log('withdraw gas:', gas)
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const { logs } = await mixer.withdraw(proof, publicSignals, { from: relayer, gasPrice: '0' })
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const balanceMixerAfter = await web3.eth.getBalance(mixer.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(toHex(receiver.toString()))
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const feeBN = toBN(fee.toString())
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balanceMixerAfter.should.be.eq.BN(toBN(balanceMixerBefore).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('Withdraw')
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logs[0].args.nullifierHash.should.be.eq.BN(toBN(input.nullifierHash.toString()))
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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 mixer.isSpent(input.nullifierHash.toString(16).padStart(66, '0x00000'))
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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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await tree.insert(deposit.commitment)
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await mixer.deposit(toBN(deposit.commitment.toString()), { value, from: sender })
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const { root, path_elements, path_index } = await tree.path(0)
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const input = stringifyBigInts({
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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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receiver,
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fee,
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secret: deposit.secret,
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pathElements: path_elements,
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pathIndex: path_index,
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})
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { proof, publicSignals } = websnarkUtils.toSolidityInput(proofData)
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await mixer.withdraw(proof, publicSignals, { from: relayer }).should.be.fulfilled
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const error = await mixer.withdraw(proof, publicSignals, { 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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await tree.insert(deposit.commitment)
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await mixer.deposit(toBN(deposit.commitment.toString()), { value, from: sender })
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const { root, path_elements, path_index } = await tree.path(0)
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const input = stringifyBigInts({
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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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receiver,
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fee,
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secret: deposit.secret,
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pathElements: path_elements,
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pathIndex: path_index,
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})
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { proof, publicSignals } = websnarkUtils.toSolidityInput(proofData)
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publicSignals[1] ='0x' + toBN(publicSignals[1]).add(toBN('21888242871839275222246405745257275088548364400416034343698204186575808495617')).toString('hex')
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const error = await mixer.withdraw(proof, publicSignals, { 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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await tree.insert(deposit.commitment)
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await mixer.deposit(toBN(deposit.commitment.toString()), { value, from: sender })
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const { root, path_elements, path_index } = await tree.path(0)
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const oneEtherFee = bigInt(1e18) // 1 ether
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const input = stringifyBigInts({
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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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receiver,
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fee: oneEtherFee,
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secret: deposit.secret,
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pathElements: path_elements,
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pathIndex: path_index,
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})
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { proof, publicSignals } = websnarkUtils.toSolidityInput(proofData)
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const error = await mixer.withdraw(proof, publicSignals, { 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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await tree.insert(deposit.commitment)
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await mixer.deposit(toBN(deposit.commitment.toString()), { value, from: sender })
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const { root, path_elements, path_index } = await 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,
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nullifier: deposit.nullifier,
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relayer: operator,
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receiver,
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fee,
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secret: deposit.secret,
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pathElements: path_elements,
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pathIndex: path_index,
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})
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const dummyRoot = randomHex(32)
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { proof, publicSignals } = websnarkUtils.toSolidityInput(proofData)
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publicSignals[0] = dummyRoot
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const error = await mixer.withdraw(proof, publicSignals, { 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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await tree.insert(deposit.commitment)
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await mixer.deposit(toBN(deposit.commitment.toString()), { value, from: sender })
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let { root, path_elements, path_index } = await tree.path(0)
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const input = stringifyBigInts({
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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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receiver,
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fee,
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secret: deposit.secret,
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pathElements: path_elements,
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pathIndex: path_index,
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})
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const proofData = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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let { proof, publicSignals } = websnarkUtils.toSolidityInput(proofData)
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const originalPublicSignals = publicSignals.slice()
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const originalProof = proof.slice()
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// receiver
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publicSignals[2] = '0x0000000000000000000000007a1f9131357404ef86d7c38dbffed2da70321337'
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let error = await mixer.withdraw(proof, publicSignals, { 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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publicSignals = originalPublicSignals.slice()
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publicSignals[3] = '0x000000000000000000000000000000000000000000000000015345785d8a0000'
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error = await mixer.withdraw(proof, publicSignals, { 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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publicSignals = originalPublicSignals.slice()
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publicSignals[1] = '0x00abdfc78211f8807b9c6504a6e537e71b8788b2f529a95f1399ce124a8642ad'
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error = await mixer.withdraw(proof, publicSignals, { 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[0] = '0x261d81d8203437f29b38a88c4263476d858e6d9645cf21740461684412b31337'
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await mixer.withdraw(proof, originalPublicSignals, { from: relayer }).should.be.rejected
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// should work with original values
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await mixer.withdraw(originalProof, originalPublicSignals, { from: relayer }).should.be.fulfilled
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})
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})
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describe('#changeOperator', () => {
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it('should work', async () => {
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let operator = await mixer.operator()
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operator.should.be.equal(sender)
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const newOperator = accounts[7]
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await mixer.changeOperator(newOperator).should.be.fulfilled
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operator = await mixer.operator()
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operator.should.be.equal(newOperator)
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})
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it('cannot change from different address', async () => {
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let operator = await mixer.operator()
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operator.should.be.equal(sender)
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const newOperator = accounts[7]
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const error = await mixer.changeOperator(newOperator, { from: accounts[7] }).should.be.rejected
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error.reason.should.be.equal('Only operator can call this function.')
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})
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})
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describe('#updateVerifier', () => {
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it('should work', async () => {
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let operator = await mixer.operator()
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operator.should.be.equal(sender)
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const newVerifier = accounts[7]
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await mixer.updateVerifier(newVerifier).should.be.fulfilled
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verifier = await mixer.verifier()
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verifier.should.be.equal(newVerifier)
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})
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it('cannot change from different address', async () => {
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let operator = await mixer.operator()
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operator.should.be.equal(sender)
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const newVerifier = accounts[7]
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const error = await mixer.updateVerifier(newVerifier, { from: accounts[7] }).should.be.rejected
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error.reason.should.be.equal('Only operator can call this function.')
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})
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})
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describe('#disableVerifierUpdate', () => {
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it('should work', async () => {
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let operator = await mixer.operator()
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operator.should.be.equal(sender)
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let isVerifierUpdateAllowed = await mixer.isVerifierUpdateAllowed()
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isVerifierUpdateAllowed.should.be.equal(true)
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await mixer.disableVerifierUpdate().should.be.fulfilled
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newValue = await mixer.isVerifierUpdateAllowed()
|
|
newValue.should.be.equal(false)
|
|
})
|
|
|
|
it('cannot update verifier after this function is called', async () => {
|
|
let operator = await mixer.operator()
|
|
operator.should.be.equal(sender)
|
|
|
|
let isVerifierUpdateAllowed = await mixer.isVerifierUpdateAllowed()
|
|
isVerifierUpdateAllowed.should.be.equal(true)
|
|
|
|
await mixer.disableVerifierUpdate().should.be.fulfilled
|
|
|
|
newValue = await mixer.isVerifierUpdateAllowed()
|
|
newValue.should.be.equal(false)
|
|
|
|
const newVerifier = accounts[7]
|
|
const error = await mixer.updateVerifier(newVerifier).should.be.rejected
|
|
error.reason.should.be.equal('Verifier updates have been disabled.')
|
|
})
|
|
})
|
|
|
|
afterEach(async () => {
|
|
await revertSnapshot(snapshotId.result)
|
|
// eslint-disable-next-line require-atomic-updates
|
|
snapshotId = await takeSnapshot()
|
|
tree = new MerkleTree(
|
|
levels,
|
|
zeroValue,
|
|
null,
|
|
prefix,
|
|
)
|
|
})
|
|
})
|