mirror of
https://github.com/tornadocash/tornado-core.git
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515 lines
22 KiB
JavaScript
515 lines
22 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 } = require('web3-utils')
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const { takeSnapshot, revertSnapshot } = require('../lib/ganacheHelper')
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const Mixer = artifacts.require('./ERC20Mixer.sol')
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const BadRecipient = artifacts.require('./BadRecipient.sol')
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const Token = artifacts.require('./ERC20Mock.sol')
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const USDTToken = artifacts.require('./IUSDT.sol')
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const { ETH_AMOUNT, TOKEN_AMOUNT, MERKLE_TREE_HEIGHT, ERC20_TOKEN } = 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 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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const toFixedHex = (number, length = 32) => '0x' + bigInt(number).toString(16).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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contract('ERC20Mixer', accounts => {
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let mixer
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let token
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let usdtToken
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let badRecipient
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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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let tokenDenomination = TOKEN_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 refund = ETH_AMOUNT || '1000000000000000000' // 1 ether
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let 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(
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levels,
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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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if (ERC20_TOKEN) {
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token = await Token.at(ERC20_TOKEN)
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usdtToken = await USDTToken.at(ERC20_TOKEN)
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} else {
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token = await Token.deployed()
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await token.mint(sender, tokenDenomination)
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}
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badRecipient = await BadRecipient.new()
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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 tokenFromContract = await mixer.token()
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tokenFromContract.should.be.equal(token.address)
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})
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})
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describe('#deposit', () => {
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it('should work', async () => {
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const commitment = toFixedHex(43)
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await token.approve(mixer.address, tokenDenomination)
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let { logs } = await mixer.deposit(commitment, { 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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})
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it('should not allow to send ether on deposit', async () => {
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const commitment = toFixedHex(43)
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await token.approve(mixer.address, tokenDenomination)
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let error = await mixer.deposit(commitment, { from: sender, value: 1e6 }).should.be.rejected
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error.reason.should.be.equal('ETH value is supposed to be 0 for ERC20 mixer')
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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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await token.mint(user, tokenDenomination)
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const balanceUserBefore = await token.balanceOf(user)
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await token.approve(mixer.address, tokenDenomination, { from: user })
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// Uncomment to measure gas usage
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// let gas = await mixer.deposit.estimateGas(toBN(deposit.commitment.toString()), { from: user, gasPrice: '0' })
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// console.log('deposit gas:', gas)
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await mixer.deposit(toFixedHex(deposit.commitment), { from: user, gasPrice: '0' })
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const balanceUserAfter = await token.balanceOf(user)
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balanceUserAfter.should.be.eq.BN(toBN(balanceUserBefore).sub(toBN(tokenDenomination)))
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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,
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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: path_elements,
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pathIndices: 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 } = websnarkUtils.toSolidityInput(proofData)
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const balanceMixerBefore = await token.balanceOf(mixer.address)
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const balanceRelayerBefore = await token.balanceOf(relayer)
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const balanceRecieverBefore = await token.balanceOf(toFixedHex(recipient, 20))
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const ethBalanceOperatorBefore = await web3.eth.getBalance(operator)
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const ethBalanceRecieverBefore = await web3.eth.getBalance(toFixedHex(recipient, 20))
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const ethBalanceRelayerBefore = await web3.eth.getBalance(relayer)
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let isSpent = await mixer.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 mixer.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 mixer.withdraw(proof, ...args, { value: refund, from: relayer, gasPrice: '0' })
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const balanceMixerAfter = await token.balanceOf(mixer.address)
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const balanceRelayerAfter = await token.balanceOf(relayer)
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const ethBalanceOperatorAfter = await web3.eth.getBalance(operator)
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const balanceRecieverAfter = await token.balanceOf(toFixedHex(recipient, 20))
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const ethBalanceRecieverAfter = await web3.eth.getBalance(toFixedHex(recipient, 20))
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const ethBalanceRelayerAfter = await web3.eth.getBalance(relayer)
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const feeBN = toBN(fee.toString())
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balanceMixerAfter.should.be.eq.BN(toBN(balanceMixerBefore).sub(toBN(tokenDenomination)))
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balanceRelayerAfter.should.be.eq.BN(toBN(balanceRelayerBefore).add(feeBN))
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balanceRecieverAfter.should.be.eq.BN(toBN(balanceRecieverBefore).add(toBN(tokenDenomination).sub(feeBN)))
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ethBalanceOperatorAfter.should.be.eq.BN(toBN(ethBalanceOperatorBefore))
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ethBalanceRecieverAfter.should.be.eq.BN(toBN(ethBalanceRecieverBefore).add(toBN(refund)))
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ethBalanceRelayerAfter.should.be.eq.BN(toBN(ethBalanceRelayerBefore).sub(toBN(refund)))
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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(relayer)
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logs[0].args.fee.should.be.eq.BN(feeBN)
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isSpent = await mixer.isSpent(toFixedHex(input.nullifierHash))
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isSpent.should.be.equal(true)
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})
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it('should return refund to the relayer is case of fail', async () => {
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const deposit = generateDeposit()
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const user = accounts[4]
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recipient = bigInt(badRecipient.address)
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await tree.insert(deposit.commitment)
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await token.mint(user, tokenDenomination)
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const balanceUserBefore = await token.balanceOf(user)
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await token.approve(mixer.address, tokenDenomination, { from: user })
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await mixer.deposit(toFixedHex(deposit.commitment), { from: user, gasPrice: '0' })
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const balanceUserAfter = await token.balanceOf(user)
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balanceUserAfter.should.be.eq.BN(toBN(balanceUserBefore).sub(toBN(tokenDenomination)))
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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,
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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: path_elements,
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pathIndices: 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 } = websnarkUtils.toSolidityInput(proofData)
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const balanceMixerBefore = await token.balanceOf(mixer.address)
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const balanceRelayerBefore = await token.balanceOf(relayer)
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const balanceRecieverBefore = await token.balanceOf(toFixedHex(recipient, 20))
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const ethBalanceOperatorBefore = await web3.eth.getBalance(operator)
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const ethBalanceRecieverBefore = await web3.eth.getBalance(toFixedHex(recipient, 20))
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const ethBalanceRelayerBefore = await web3.eth.getBalance(relayer)
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let isSpent = await mixer.isSpent(toFixedHex(input.nullifierHash))
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isSpent.should.be.equal(false)
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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 mixer.withdraw(proof, ...args, { value: refund, from: relayer, gasPrice: '0' })
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const balanceMixerAfter = await token.balanceOf(mixer.address)
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const balanceRelayerAfter = await token.balanceOf(relayer)
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const ethBalanceOperatorAfter = await web3.eth.getBalance(operator)
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const balanceRecieverAfter = await token.balanceOf(toFixedHex(recipient, 20))
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const ethBalanceRecieverAfter = await web3.eth.getBalance(toFixedHex(recipient, 20))
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const ethBalanceRelayerAfter = await web3.eth.getBalance(relayer)
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const feeBN = toBN(fee.toString())
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balanceMixerAfter.should.be.eq.BN(toBN(balanceMixerBefore).sub(toBN(tokenDenomination)))
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balanceRelayerAfter.should.be.eq.BN(toBN(balanceRelayerBefore).add(feeBN))
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balanceRecieverAfter.should.be.eq.BN(toBN(balanceRecieverBefore).add(toBN(tokenDenomination).sub(feeBN)))
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ethBalanceOperatorAfter.should.be.eq.BN(toBN(ethBalanceOperatorBefore))
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ethBalanceRecieverAfter.should.be.eq.BN(toBN(ethBalanceRecieverBefore))
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ethBalanceRelayerAfter.should.be.eq.BN(toBN(ethBalanceRelayerBefore))
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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(relayer)
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logs[0].args.fee.should.be.eq.BN(feeBN)
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isSpent = await mixer.isSpent(toFixedHex(input.nullifierHash))
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isSpent.should.be.equal(true)
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})
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it('should reject with wrong refund value', 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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await token.mint(user, tokenDenomination)
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await token.approve(mixer.address, tokenDenomination, { from: user })
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await mixer.deposit(toFixedHex(deposit.commitment), { from: user, gasPrice: '0' })
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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,
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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: path_elements,
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pathIndices: 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 } = 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 { reason } = await mixer.withdraw(proof, ...args, { value: 1, from: relayer, gasPrice: '0' }).should.be.rejected
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reason.should.be.equal('Incorrect refund amount received by the contract')
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;({ reason } = await mixer.withdraw(proof, ...args, { value: toBN(refund).mul(toBN(2)), from: relayer, gasPrice: '0' }).should.be.rejected)
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reason.should.be.equal('Incorrect refund amount received by the contract')
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})
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it.skip('should work with REAL USDT', async () => {
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// dont forget to specify your token in .env
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// USDT decimals is 6, so TOKEN_AMOUNT=1000000
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// and sent `tokenDenomination` to accounts[0] (0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1)
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// run ganache as
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// ganache-cli --fork https://kovan.infura.io/v3/27a9649f826b4e31a83e07ae09a87448@13147586 -d --keepAliveTimeout 20
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const deposit = generateDeposit()
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const user = accounts[4]
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const userBal = await usdtToken.balanceOf(user)
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console.log('userBal', userBal.toString())
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const senderBal = await usdtToken.balanceOf(sender)
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console.log('senderBal', senderBal.toString())
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await tree.insert(deposit.commitment)
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await usdtToken.transfer(user, tokenDenomination, { from: sender })
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console.log('transfer done')
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const balanceUserBefore = await usdtToken.balanceOf(user)
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console.log('balanceUserBefore', balanceUserBefore.toString())
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await usdtToken.approve(mixer.address, tokenDenomination, { from: user })
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console.log('approve done')
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const allowanceUser = await usdtToken.allowance(user, mixer.address)
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console.log('allowanceUser', allowanceUser.toString())
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await mixer.deposit(toFixedHex(deposit.commitment), { from: user, gasPrice: '0' })
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console.log('deposit done')
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const balanceUserAfter = await usdtToken.balanceOf(user)
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balanceUserAfter.should.be.eq.BN(toBN(balanceUserBefore).sub(toBN(tokenDenomination)))
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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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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: path_elements,
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pathIndices: 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 } = websnarkUtils.toSolidityInput(proofData)
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const balanceMixerBefore = await usdtToken.balanceOf(mixer.address)
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const balanceRelayerBefore = await usdtToken.balanceOf(relayer)
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const ethBalanceOperatorBefore = await web3.eth.getBalance(operator)
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const balanceRecieverBefore = await usdtToken.balanceOf(toFixedHex(recipient, 20))
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const ethBalanceRecieverBefore = await web3.eth.getBalance(toFixedHex(recipient, 20))
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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 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 mixer.withdraw(proof, ...args, { value: refund, from: relayer, gasPrice: '0' })
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const balanceMixerAfter = await usdtToken.balanceOf(mixer.address)
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const balanceRelayerAfter = await usdtToken.balanceOf(relayer)
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const ethBalanceOperatorAfter = await web3.eth.getBalance(operator)
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const balanceRecieverAfter = await usdtToken.balanceOf(toFixedHex(recipient, 20))
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const ethBalanceRecieverAfter = await web3.eth.getBalance(toFixedHex(recipient, 20))
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const feeBN = toBN(fee.toString())
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balanceMixerAfter.should.be.eq.BN(toBN(balanceMixerBefore).sub(toBN(tokenDenomination)))
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balanceRelayerAfter.should.be.eq.BN(toBN(balanceRelayerBefore))
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ethBalanceOperatorAfter.should.be.eq.BN(toBN(ethBalanceOperatorBefore).add(feeBN))
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balanceRecieverAfter.should.be.eq.BN(toBN(balanceRecieverBefore).add(toBN(tokenDenomination)))
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ethBalanceRecieverAfter.should.be.eq.BN(toBN(ethBalanceRecieverBefore).add(toBN(refund)).sub(feeBN))
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logs[0].event.should.be.equal('Withdrawal')
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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.skip('should work with REAL DAI', async () => {
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// dont forget to specify your token in .env
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// and send `tokenDenomination` to accounts[0] (0x90F8bf6A479f320ead074411a4B0e7944Ea8c9C1)
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// run ganache as
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// npx ganache-cli --fork https://kovan.infura.io/v3/27a9649f826b4e31a83e07ae09a87448@13146218 -d --keepAliveTimeout 20
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const deposit = generateDeposit()
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const user = accounts[4]
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const userBal = await token.balanceOf(user)
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console.log('userBal', userBal.toString())
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const senderBal = await token.balanceOf(sender)
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console.log('senderBal', senderBal.toString())
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await tree.insert(deposit.commitment)
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await token.transfer(user, tokenDenomination, { from: sender })
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console.log('transfer done')
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const balanceUserBefore = await token.balanceOf(user)
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console.log('balanceUserBefore', balanceUserBefore.toString())
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await token.approve(mixer.address, tokenDenomination, { from: user })
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console.log('approve done')
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await mixer.deposit(toFixedHex(deposit.commitment), { from: user, gasPrice: '0' })
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console.log('deposit done')
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const balanceUserAfter = await token.balanceOf(user)
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balanceUserAfter.should.be.eq.BN(toBN(balanceUserBefore).sub(toBN(tokenDenomination)))
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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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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: path_elements,
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pathIndices: 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 } = websnarkUtils.toSolidityInput(proofData)
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const balanceMixerBefore = await token.balanceOf(mixer.address)
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const balanceRelayerBefore = await token.balanceOf(relayer)
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const ethBalanceOperatorBefore = await web3.eth.getBalance(operator)
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const balanceRecieverBefore = await token.balanceOf(toFixedHex(recipient, 20))
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const ethBalanceRecieverBefore = await web3.eth.getBalance(toFixedHex(recipient, 20))
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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 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 mixer.withdraw(proof, ...args, { value: refund, from: relayer, gasPrice: '0' })
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console.log('withdraw done')
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const balanceMixerAfter = await token.balanceOf(mixer.address)
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const balanceRelayerAfter = await token.balanceOf(relayer)
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const ethBalanceOperatorAfter = await web3.eth.getBalance(operator)
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const balanceRecieverAfter = await token.balanceOf(toFixedHex(recipient, 20))
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const ethBalanceRecieverAfter = await web3.eth.getBalance(toFixedHex(recipient, 20))
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const feeBN = toBN(fee.toString())
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balanceMixerAfter.should.be.eq.BN(toBN(balanceMixerBefore).sub(toBN(tokenDenomination)))
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balanceRelayerAfter.should.be.eq.BN(toBN(balanceRelayerBefore))
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ethBalanceOperatorAfter.should.be.eq.BN(toBN(ethBalanceOperatorBefore).add(feeBN))
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balanceRecieverAfter.should.be.eq.BN(toBN(balanceRecieverBefore).add(toBN(tokenDenomination)))
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ethBalanceRecieverAfter.should.be.eq.BN(toBN(ethBalanceRecieverBefore).add(toBN(refund)).sub(feeBN))
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logs[0].event.should.be.equal('Withdrawal')
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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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})
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afterEach(async () => {
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await revertSnapshot(snapshotId.result)
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// eslint-disable-next-line require-atomic-updates
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snapshotId = await takeSnapshot()
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tree = new MerkleTree(
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levels,
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null,
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prefix,
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)
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})
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})
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