mirror of
https://github.com/tornadocash/tornado-core.git
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346 lines
12 KiB
JavaScript
346 lines
12 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('./Mixer.sol')
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const { 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 unstringifyBigInts = require('websnark/tools/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(32), deposit.secret.leInt2Buff(32)])
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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 = unstringifyBigInts(websnarkUtils.fromSolidityInput(proof))
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const verification_key = unstringifyBigInts(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('Mixer', accounts => {
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let mixer
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const sender = 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 = AMOUNT || '1000000000000000000'
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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(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 transferValue = await mixer.transferValue()
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transferValue.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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const commitment = 42
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const { logs } = await mixer.deposit(commitment, { value, from: sender })
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logs[0].event.should.be.equal('LeafAdded')
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logs[0].args.leaf.should.be.eq.BN(toBN(commitment))
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logs[0].args.leaf_index.should.be.eq.BN(toBN(0))
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logs[1].event.should.be.equal('Deposit')
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logs[1].args.from.should.be.equal(sender)
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logs[1].args.commitment.should.be.eq.BN(toBN(commitment))
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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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nullifier: deposit.nullifier,
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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 proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const originalProof = JSON.parse(JSON.stringify(proof))
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let result = snarkVerify(proof)
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result.should.be.equal(true)
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// nullifier
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proof.publicSignals[1] = '133792158246920651341275668520530514036799294649489851421007411546007850802'
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result = snarkVerify(proof)
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result.should.be.equal(false)
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proof = originalProof
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// try to cheat with recipient
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proof.publicSignals[2] = '133738360804642228759657445999390850076318544422'
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result = snarkVerify(proof)
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result.should.be.equal(false)
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proof = originalProof
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// fee
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proof.publicSignals[3] = '1337100000000000000000'
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result = snarkVerify(proof)
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result.should.be.equal(false)
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proof = 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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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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nullifier: deposit.nullifier,
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receiver,
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fee,
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// private
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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 proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { pi_a, pi_b, pi_c, publicSignals } = websnarkUtils.toSolidityInput(proof)
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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 balanceRecieverBefore = await web3.eth.getBalance(toHex(receiver.toString()))
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const { logs } = await mixer.withdraw(pi_a, pi_b, pi_c, 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 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).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.nullifier.should.be.eq.BN(toBN(deposit.nullifier.toString()))
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logs[0].args.fee.should.be.eq.BN(feeBN)
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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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nullifier: deposit.nullifier,
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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 proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { pi_a, pi_b, pi_c, publicSignals } = websnarkUtils.toSolidityInput(proof)
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await mixer.withdraw(pi_a, pi_b, pi_c, publicSignals, { from: relayer }).should.be.fulfilled
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const error = await mixer.withdraw(pi_a, pi_b, pi_c, 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('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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nullifier: deposit.nullifier,
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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 proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { pi_a, pi_b, pi_c, publicSignals } = websnarkUtils.toSolidityInput(proof)
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const error = await mixer.withdraw(pi_a, pi_b, pi_c, 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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root,
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nullifier: deposit.nullifier,
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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 proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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const { pi_a, pi_b, pi_c, publicSignals } = websnarkUtils.toSolidityInput(proof)
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publicSignals[0] = dummyRoot
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const error = await mixer.withdraw(pi_a, pi_b, pi_c, 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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nullifier: deposit.nullifier,
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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 proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key)
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let { pi_a, pi_b, pi_c, publicSignals } = websnarkUtils.toSolidityInput(proof)
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const originalPublicSignals = publicSignals.slice()
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const originalPi_a = pi_a.slice()
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// receiver
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publicSignals[2] = '0x0000000000000000000000007a1f9131357404ef86d7c38dbffed2da70321337'
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let error = await mixer.withdraw(pi_a, pi_b, pi_c, 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(pi_a, pi_b, pi_c, 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(pi_a, pi_b, pi_c, 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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pi_a[0] = '0x261d81d8203437f29b38a88c4263476d858e6d9645cf21740461684412b31337'
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await mixer.withdraw(pi_a, pi_b, pi_c, originalPublicSignals, { from: relayer }).should.be.rejected
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// should work with original values
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await mixer.withdraw(originalPi_a, pi_b, pi_c, originalPublicSignals, { from: relayer }).should.be.fulfilled
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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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zeroValue,
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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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