diff --git a/.gitignore b/.gitignore index 135f8a8..81c6bfb 100644 --- a/.gitignore +++ b/.gitignore @@ -96,3 +96,6 @@ typings/ ERC20Mixer_flat.sol ETHMixer_flat.sol + +.openzeppelin/.session +.openzeppelin/dev-*.json diff --git a/.openzeppelin/project.json b/.openzeppelin/project.json new file mode 100644 index 0000000..849f7bc --- /dev/null +++ b/.openzeppelin/project.json @@ -0,0 +1,15 @@ +{ + "manifestVersion": "2.2", + "contracts": { + "ETHMixer": "ETHMixer" + }, + "dependencies": {}, + "name": "tornado", + "version": "1.0.0", + "compiler": { + "manager": "truffle", + "compilerSettings": { + "optimizer": {} + } + } +} \ No newline at end of file diff --git a/circuits/withdraw.circom b/circuits/withdraw.circom index 27612d8..611a074 100644 --- a/circuits/withdraw.circom +++ b/circuits/withdraw.circom @@ -31,8 +31,7 @@ template Withdraw(levels, rounds) { signal input root; signal input nullifierHash; signal input receiver; // not taking part in any computations - signal input relayer; // not taking part in any computations - signal input fee; // not taking part in any computations + signal private input nullifier; signal private input secret; signal private input pathElements[levels]; @@ -56,11 +55,7 @@ template Withdraw(levels, rounds) { // Most likely it is not required, but it's better to stay on the safe side and it only takes 2 constraints // Squares are used to prevent optimizer from removing those constraints signal receiverSquare; - signal feeSquare; - signal relayerSquare; receiverSquare <== receiver * receiver; - feeSquare <== fee * fee; - relayerSquare <== relayer * relayer; } component main = Withdraw(16, 220); diff --git a/cli.js b/cli.js index dd4ee1f..a6e4bbc 100755 --- a/cli.js +++ b/cli.js @@ -11,6 +11,8 @@ const merkleTree = require('./lib/MerkleTree') const Web3 = require('web3') const buildGroth16 = require('websnark/src/groth16') const websnarkUtils = require('websnark/src/utils') +const { GSNProvider, GSNDevProvider } = require('@openzeppelin/gsn-provider') +const { ephemeral } = require('@openzeppelin/network') let web3, mixer, erc20mixer, circuit, proving_key, groth16, erc20 let MERKLE_TREE_HEIGHT, ETH_AMOUNT, EMPTY_ELEMENT, ERC20_TOKEN @@ -194,11 +196,83 @@ async function withdraw(note, receiver) { console.log('Done') } +async function withdrawViaRelayer(note, receiver) { + // Decode hex string and restore the deposit object + let buf = Buffer.from(note.slice(2), 'hex') + let deposit = createDeposit(bigInt.leBuff2int(buf.slice(0, 31)), bigInt.leBuff2int(buf.slice(31, 62))) + const nullifierHash = pedersenHash(deposit.nullifier.leInt2Buff(31)) + const paddedNullifierHash = nullifierHash.toString(16).padStart('66', '0x000000') + const paddedCommitment = deposit.commitment.toString(16).padStart('66', '0x000000') + + // Get all deposit events from smart contract and assemble merkle tree from them + console.log('Getting current state from mixer contract') + const events = await mixer.getPastEvents('Deposit', { fromBlock: mixer.deployedBlock, toBlock: 'latest' }) + const leaves = events + .sort((a, b) => a.returnValues.leafIndex.sub(b.returnValues.leafIndex)) // Sort events in chronological order + .map(e => e.returnValues.commitment) + const tree = new merkleTree(MERKLE_TREE_HEIGHT, EMPTY_ELEMENT, leaves) + + // Find current commitment in the tree + let depositEvent = events.find(e => e.returnValues.commitment.eq(paddedCommitment)) + let leafIndex = depositEvent ? depositEvent.returnValues.leafIndex.toNumber() : -1 + + // Validate that our data is correct + const isValidRoot = await mixer.methods.isKnownRoot(await tree.root()).call() + const isSpent = await mixer.methods.isSpent(paddedNullifierHash).call() + assert(isValidRoot === true, 'Merkle tree assembled incorrectly') // Merkle tree assembled correctly + assert(isSpent === false, 'The note is spent') // The note is not spent + assert(leafIndex >= 0, 'Our deposit is not present in the tree') // Our deposit is present in the tree + + // Compute merkle proof of our commitment + const { root, path_elements, path_index } = await tree.path(leafIndex) + + // Prepare circuit input + const input = { + // Public snark inputs + root: root, + nullifierHash, + receiver: bigInt(receiver), + + // Private snark inputs + nullifier: deposit.nullifier, + secret: deposit.secret, + pathElements: path_elements, + pathIndex: path_index, + } + + console.log('Generating SNARK proof') + console.time('Proof time') + const proof = await websnarkUtils.genWitnessAndProve(groth16, input, circuit, proving_key) + const { pi_a, pi_b, pi_c, publicSignals } = websnarkUtils.toSolidityInput(proof) + console.timeEnd('Proof time') + + console.log('Submitting withdraw transaction via relayer') + + const account = ephemeral() + const HARDCODED_RELAYER_OPTS = { + txFee: 90, + fixedGasPrice: 22000000001, + gasPrice: 22000000001, + fixedGasLimit: 5000000, + gasLimit: 5000000, + verbose: true, + } + // const provider = new GSNProvider('https://rinkeby.infura.io/v3/c7463beadf2144e68646ff049917b716', { signKey: account }) + const provider = new GSNDevProvider('http://localhost:8545', { signKey: account, ...HARDCODED_RELAYER_OPTS }) + web3 = new Web3(provider) + const netId = await web3.eth.net.getId() + // eslint-disable-next-line require-atomic-updates + mixer = new web3.eth.Contract(contractJson.abi, contractJson.networks[netId].address) + console.log('mixer address', contractJson.networks[netId].address) + const tx = await mixer.methods.withdrawViaRelayer(pi_a, pi_b, pi_c, publicSignals).send({ from: account.address, gas: '5000000' }) + console.log('tx', tx) + console.log('Done') +} /** * Init web3, contracts, and snark */ +let contractJson, erc20ContractJson, erc20mixerJson async function init() { - let contractJson, erc20ContractJson, erc20mixerJson if (inBrowser) { // Initialize using injected web3 (Metamask) // To assemble web version run `npm run browserify` @@ -207,7 +281,7 @@ async function init() { circuit = await (await fetch('build/circuits/withdraw.json')).json() proving_key = await (await fetch('build/circuits/withdraw_proving_key.bin')).arrayBuffer() MERKLE_TREE_HEIGHT = 16 - ETH_AMOUNT = 1e18 + ETH_AMOUNT = '30000000000000000' EMPTY_ELEMENT = 1 } else { // Initialize from local node @@ -231,9 +305,11 @@ async function init() { mixer.deployedBlock = tx.blockNumber } - const tx3 = await web3.eth.getTransaction(erc20mixerJson.networks[netId].transactionHash) - erc20mixer = new web3.eth.Contract(erc20mixerJson.abi, erc20mixerJson.networks[netId].address) - erc20mixer.deployedBlock = tx3.blockNumber + if (erc20mixerJson) { + const tx3 = await web3.eth.getTransaction(erc20mixerJson.networks[netId].transactionHash) + erc20mixer = new web3.eth.Contract(erc20mixerJson.abi, erc20mixerJson.networks[netId].address) + erc20mixer.deployedBlock = tx3.blockNumber + } if(ERC20_TOKEN === '') { erc20 = new web3.eth.Contract(erc20ContractJson.abi, erc20ContractJson.networks[netId].address) @@ -273,6 +349,11 @@ if (inBrowser) { const receiver = (await web3.eth.getAccounts())[0] await withdraw(note, receiver) } + window.withdrawViaRelayer = async () => { + const note = prompt('Enter the note to withdrawViaRelayer') + const receiver = (await web3.eth.getAccounts())[0] + await withdrawViaRelayer(note, receiver) + } init() } else { const args = process.argv.slice(2) @@ -320,6 +401,13 @@ if (inBrowser) { else printHelp(1) break + case 'withdrawViaRelayer': + if (args.length === 3 && /^0x[0-9a-fA-F]{124}$/.test(args[1]) && /^0x[0-9a-fA-F]{40}$/.test(args[2])) { + init().then(() => withdrawViaRelayer(args[1], args[2])).then(() => process.exit(0)).catch(err => {console.log(err); process.exit(1)}) + } + else + printHelp(1) + break case 'auto': if (args.length === 1) { (async () => { diff --git a/contracts/ETHMixer.sol b/contracts/ETHMixer.sol index 107fe6c..fdb0aca 100644 --- a/contracts/ETHMixer.sol +++ b/contracts/ETHMixer.sol @@ -12,8 +12,10 @@ pragma solidity ^0.5.8; import "./Mixer.sol"; +import "@openzeppelin/contracts-ethereum-package/contracts/GSN/GSNRecipient.sol"; +import "@openzeppelin/contracts-ethereum-package/contracts/GSN/IRelayHub.sol"; -contract ETHMixer is Mixer { +contract ETHMixer is Mixer, GSNRecipient { constructor( address _verifier, uint256 _mixDenomination, @@ -23,14 +25,77 @@ contract ETHMixer is Mixer { ) Mixer(_verifier, _mixDenomination, _merkleTreeHeight, _emptyElement, _operator) public { } - function _processWithdraw(address payable _receiver, address payable _relayer, uint256 _fee) internal { - _receiver.transfer(mixDenomination - _fee); - if (_fee > 0) { - _relayer.transfer(_fee); - } + function _processWithdraw(address payable _receiver) internal { + _receiver.transfer(mixDenomination); } function _processDeposit() internal { require(msg.value == mixDenomination, "Please send `mixDenomination` ETH along with transaction"); } + + function withdrawViaRelayer(uint256[2] memory a, uint256[2][2] memory b, uint256[2] memory c, uint256[3] memory input) public { + uint256 root = input[0]; + uint256 nullifierHash = input[1]; + require(!nullifierHashes[nullifierHash], "The note has been already spent"); + + require(isKnownRoot(root), "Cannot find your merkle root"); // Make sure to use a recent one + require(verifier.verifyProof(a, b, c, input), "Invalid withdraw proof"); + nullifierHashes[nullifierHash] = true; + // we will process withdraw in postRelayedCall func + } + + // gsn related stuff + // this func is called by a Relayer via the RelayerHub before sending a tx + function acceptRelayedCall( + address relay, + address from, + bytes calldata encodedFunction, + uint256 transactionFee, + uint256 gasPrice, + uint256 gasLimit, + uint256 nonce, + bytes calldata approvalData, + uint256 maxPossibleCharge + ) external view returns (uint256, bytes memory) { + // think of a withdraw dry-run + if (_computeCharge(gasLimit, gasPrice, transactionFee) * 2 > mixDenomination) { + return (1, "Fee exceeds 50% of transfer value"); + } + + if (!compareBytesWithSelector(encodedFunction, this.withdrawViaRelayer.selector)) { + return (2, "Only withdrawViaRelayer can be called"); + } + + return _approveRelayedCall(); + } + + // this func is called by RelayerHub right before calling a target func + function preRelayedCall(bytes calldata /*context*/) external returns (bytes32) {} + + event Debug(uint actualCharge, bytes context, address recipient); + // this func is called by RelayerHub right after calling a target func + function postRelayedCall(bytes memory context, bool /*success*/, uint actualCharge, bytes32 /*preRetVal*/) public { + IRelayHub relayHub = IRelayHub(getHubAddr()); + address payable recipient; + assembly { + recipient := sload(add(context, 324)) // 4 + (8 * 32) + (32) + (32) == selector + proof + root + nullifier + } + emit Debug(actualCharge, context, recipient); + + recipient.transfer(mixDenomination - actualCharge); + relayHub.depositFor.value(actualCharge)(address(this)); + // or we can send actualCharge somewhere else... + } + + function compareBytesWithSelector(bytes memory data, bytes4 sel) internal pure returns (bool) { + return data[0] == sel[0] + && data[1] == sel[1] + && data[2] == sel[2] + && data[3] == sel[3]; + } + + function withdrawFundsFromHub(uint256 amount, address payable dest) external { + require(msg.sender == operator, "unauthorized"); + IRelayHub(getHubAddr()).withdraw(amount, dest); + } } diff --git a/contracts/Mixer.sol b/contracts/Mixer.sol index 262967c..8a27ac2 100644 --- a/contracts/Mixer.sol +++ b/contracts/Mixer.sol @@ -14,7 +14,7 @@ pragma solidity ^0.5.8; import "./MerkleTreeWithHistory.sol"; contract IVerifier { - function verifyProof(uint256[2] memory a, uint256[2][2] memory b, uint256[2] memory c, uint256[5] memory input) public returns(bool); + function verifyProof(uint256[2] memory a, uint256[2][2] memory b, uint256[2] memory c, uint256[3] memory input) public returns(bool); } contract Mixer is MerkleTreeWithHistory { @@ -29,7 +29,7 @@ contract Mixer is MerkleTreeWithHistory { uint256 public mixDenomination; event Deposit(uint256 indexed commitment, uint256 leafIndex, uint256 timestamp); - event Withdraw(address to, uint256 nullifierHash, address indexed relayer, uint256 fee); + event Withdraw(address to, uint256 nullifierHash, address indexed relayer); /** @dev The constructor @@ -75,20 +75,17 @@ contract Mixer is MerkleTreeWithHistory { - the receiver of funds - optional fee that goes to the transaction sender (usually a relay) */ - function withdraw(uint256[2] memory a, uint256[2][2] memory b, uint256[2] memory c, uint256[5] memory input) public { + function withdraw(uint256[2] memory a, uint256[2][2] memory b, uint256[2] memory c, uint256[3] memory input) public { uint256 root = input[0]; uint256 nullifierHash = input[1]; address payable receiver = address(input[2]); - address payable relayer = address(input[3]); - uint256 fee = input[4]; - require(fee < mixDenomination, "Fee exceeds transfer value"); require(!nullifierHashes[nullifierHash], "The note has been already spent"); require(isKnownRoot(root), "Cannot find your merkle root"); // Make sure to use a recent one require(verifier.verifyProof(a, b, c, input), "Invalid withdraw proof"); nullifierHashes[nullifierHash] = true; - _processWithdraw(receiver, relayer, fee); - emit Withdraw(receiver, nullifierHash, relayer, fee); + _processWithdraw(receiver); + emit Withdraw(receiver, nullifierHash, receiver); } function toggleDeposits() external { @@ -106,6 +103,5 @@ contract Mixer is MerkleTreeWithHistory { } function _processDeposit() internal {} - function _processWithdraw(address payable _receiver, address payable _relayer, uint256 _fee) internal {} - + function _processWithdraw(address payable _receiver) internal {} } diff --git a/index.html b/index.html index 359c20b..1d78b83 100644 --- a/index.html +++ b/index.html @@ -10,6 +10,7 @@ Make sure your Metamask is unlocked and connected to Kovan (or other network you've deployed your contract to)
Deposit Withdraw + withdrawViaRelayer

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"https://registry.npmjs.org/split-string/-/split-string-3.1.0.tgz", @@ -9623,6 +13226,12 @@ "resolved": "https://registry.npmjs.org/tweetnacl/-/tweetnacl-0.14.5.tgz", "integrity": "sha1-WuaBd/GS1EViadEIr6k/+HQ/T2Q=" }, + "tweetnacl-util": { + "version": "0.15.0", + "resolved": "https://registry.npmjs.org/tweetnacl-util/-/tweetnacl-util-0.15.0.tgz", + "integrity": "sha1-RXbBzuXi1j0gf+5S8boCgZSAvHU=", + "dev": true + }, "type": { "version": "1.0.1", "resolved": "https://registry.npmjs.org/type/-/type-1.0.1.tgz", diff --git a/package.json b/package.json index 34daa2e..6b5a019 100644 --- a/package.json +++ b/package.json @@ -42,6 +42,11 @@ "websnark": "git+https://github.com/peppersec/websnark.git#ed6a4d8a6fb081a62af26820980046bbb602d559" }, "devDependencies": { + "@openzeppelin/contracts-ethereum-package": "^2.2.3", + "@openzeppelin/gsn-helpers": "^0.2.0", + "@openzeppelin/gsn-provider": "^0.1.7", + "@openzeppelin/network": "^0.2.9", + "@openzeppelin/upgrades": "^2.5.3", "truffle-flattener": "^1.4.0" } } diff --git a/truffle-config.js b/truffle-config.js index f510404..feb59fe 100644 --- a/truffle-config.js +++ b/truffle-config.js @@ -51,6 +51,15 @@ module.exports = { // timeoutBlocks: 200, skipDryRun: true }, + rinkeby: { + provider: () => new HDWalletProvider(process.env.PRIVATE_KEY, 'https://rinkeby.infura.io/v3/c7463beadf2144e68646ff049917b716'), + network_id: 4, + gas: 6000000, + gasPrice: utils.toWei('1', 'gwei'), + // confirmations: 0, + // timeoutBlocks: 200, + skipDryRun: true + }, mainnet: { provider: () => new HDWalletProvider(process.env.PRIVATE_KEY, 'http://ethereum-rpc.trustwalletapp.com'), network_id: 1,