236 lines
8.1 KiB
Solidity
236 lines
8.1 KiB
Solidity
// SPDX-License-Identifier: MIT
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// https://tornado.cash
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/*
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* d888888P dP a88888b. dP
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* 88 88 d8' `88 88
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* 88 .d8888b. 88d888b. 88d888b. .d8888b. .d888b88 .d8888b. 88 .d8888b. .d8888b. 88d888b.
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* 88 88' `88 88' `88 88' `88 88' `88 88' `88 88' `88 88 88' `88 Y8ooooo. 88' `88
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* 88 88. .88 88 88 88 88. .88 88. .88 88. .88 dP Y8. .88 88. .88 88 88 88
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* dP `88888P' dP dP dP `88888P8 `88888P8 `88888P' 88 Y88888P' `88888P8 `88888P' dP dP
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* ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
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*/
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pragma solidity ^0.7.0;
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pragma experimental ABIEncoderV2;
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import "@openzeppelin/contracts/contracts/token/ERC20/IERC20.sol";
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import "./MerkleTreeWithHistory.sol";
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import "hardhat/console.sol";
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interface IERC6777 is IERC20 {
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function transferAndCall(
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address,
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uint256,
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bytes calldata
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) external returns (bool);
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}
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interface IVerifier {
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function verifyProof(bytes memory _proof, uint256[7] memory _input) external view returns (bool);
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function verifyProof(bytes memory _proof, uint256[21] memory _input) external view returns (bool);
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}
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interface IERC20Receiver {
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function onTokenBridged(
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IERC6777 token,
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uint256 value,
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bytes calldata data
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) external;
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}
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contract TornadoPool is MerkleTreeWithHistory, IERC20Receiver {
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int256 public constant MAX_EXT_AMOUNT = 2**248;
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uint256 public constant MAX_FEE = 2**248;
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mapping(bytes32 => bool) public nullifierHashes;
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IVerifier public immutable verifier2;
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IVerifier public immutable verifier16;
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IERC6777 public immutable token;
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address public immutable omniBridge;
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address public immutable l1Unwrapper;
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struct ExtData {
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address recipient;
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int256 extAmount;
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address relayer;
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uint256 fee;
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bytes encryptedOutput1;
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bytes encryptedOutput2;
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bool isL1Withdrawal;
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}
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struct Proof {
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bytes proof;
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bytes32 root;
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bytes32[] inputNullifiers;
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bytes32[2] outputCommitments;
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uint256 publicAmount;
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bytes32 extDataHash;
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}
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struct Register {
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bytes pubKey;
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bytes account;
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}
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event NewCommitment(bytes32 commitment, uint256 index, bytes encryptedOutput);
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event NewNullifier(bytes32 nullifier);
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event PublicKey(address indexed owner, bytes key);
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event EncryptedAccount(address indexed owner, bytes account);
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/**
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@dev The constructor
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@param _verifier2 the address of SNARK verifier for 2 inputs
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@param _verifier16 the address of SNARK verifier for 16 inputs
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*/
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constructor(
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IVerifier _verifier2,
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IVerifier _verifier16,
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uint32 _levels,
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address _hasher,
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IERC6777 _token,
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address _omniBridge,
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address _l1Unwrapper
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) MerkleTreeWithHistory(_levels, _hasher) {
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verifier2 = _verifier2;
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verifier16 = _verifier16;
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token = _token;
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omniBridge = _omniBridge;
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l1Unwrapper = _l1Unwrapper;
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}
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function transact(Proof memory _args, ExtData memory _extData) public {
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if (_extData.extAmount > 0) {
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// for deposits from L2
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token.transferFrom(msg.sender, address(this), uint256(_extData.extAmount));
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}
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_transact(_args, _extData);
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}
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function _transact(Proof memory _args, ExtData memory _extData) internal {
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require(isKnownRoot(_args.root), "Invalid merkle root");
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for (uint256 i = 0; i < _args.inputNullifiers.length; i++) {
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require(!isSpent(_args.inputNullifiers[i]), "Input is already spent");
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}
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require(uint256(_args.extDataHash) == uint256(keccak256(abi.encode(_extData))) % FIELD_SIZE, "Incorrect external data hash");
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require(_args.publicAmount == calculatePublicAmount(_extData.extAmount, _extData.fee), "Invalid public amount");
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require(verifyProof(_args), "Invalid transaction proof");
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for (uint256 i = 0; i < _args.inputNullifiers.length; i++) {
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nullifierHashes[_args.inputNullifiers[i]] = true;
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}
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if (_extData.extAmount < 0) {
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require(_extData.recipient != address(0), "Can't withdraw to zero address");
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if (_extData.isL1Withdrawal) {
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token.transferAndCall(omniBridge, uint256(-_extData.extAmount), abi.encodePacked(l1Unwrapper, _extData.recipient));
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} else {
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token.transfer(_extData.recipient, uint256(-_extData.extAmount));
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}
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}
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if (_extData.fee > 0) {
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token.transfer(_extData.relayer, _extData.fee);
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}
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_insert(_args.outputCommitments[0], _args.outputCommitments[1]);
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emit NewCommitment(_args.outputCommitments[0], nextIndex - 2, _extData.encryptedOutput1);
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emit NewCommitment(_args.outputCommitments[1], nextIndex - 1, _extData.encryptedOutput2);
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for (uint256 i = 0; i < _args.inputNullifiers.length; i++) {
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emit NewNullifier(_args.inputNullifiers[i]);
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}
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}
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function calculatePublicAmount(int256 _extAmount, uint256 _fee) public pure returns (uint256) {
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require(_fee < MAX_FEE, "Invalid fee");
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require(_extAmount > -MAX_EXT_AMOUNT && _extAmount < MAX_EXT_AMOUNT, "Invalid ext amount");
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int256 publicAmount = _extAmount - int256(_fee);
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return (publicAmount >= 0) ? uint256(publicAmount) : FIELD_SIZE - uint256(-publicAmount);
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}
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/** @dev whether a note is already spent */
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function isSpent(bytes32 _nullifierHash) public view returns (bool) {
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return nullifierHashes[_nullifierHash];
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}
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function verifyProof(Proof memory _args) public view returns (bool) {
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if (_args.inputNullifiers.length == 2) {
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return
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verifier2.verifyProof(
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_args.proof,
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[
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uint256(_args.root),
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_args.publicAmount,
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uint256(_args.extDataHash),
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uint256(_args.inputNullifiers[0]),
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uint256(_args.inputNullifiers[1]),
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uint256(_args.outputCommitments[0]),
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uint256(_args.outputCommitments[1])
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]
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);
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} else if (_args.inputNullifiers.length == 16) {
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return
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verifier16.verifyProof(
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_args.proof,
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[
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uint256(_args.root),
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_args.publicAmount,
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uint256(_args.extDataHash),
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uint256(_args.inputNullifiers[0]),
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uint256(_args.inputNullifiers[1]),
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uint256(_args.inputNullifiers[2]),
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uint256(_args.inputNullifiers[3]),
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uint256(_args.inputNullifiers[4]),
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uint256(_args.inputNullifiers[5]),
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uint256(_args.inputNullifiers[6]),
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uint256(_args.inputNullifiers[7]),
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uint256(_args.inputNullifiers[8]),
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uint256(_args.inputNullifiers[9]),
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uint256(_args.inputNullifiers[10]),
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uint256(_args.inputNullifiers[11]),
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uint256(_args.inputNullifiers[12]),
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uint256(_args.inputNullifiers[13]),
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uint256(_args.inputNullifiers[14]),
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uint256(_args.inputNullifiers[15]),
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uint256(_args.outputCommitments[0]),
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uint256(_args.outputCommitments[1])
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]
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);
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} else {
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revert("unsupported input count");
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}
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}
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function register(Register memory args) public {
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emit PublicKey(msg.sender, args.pubKey);
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emit EncryptedAccount(msg.sender, args.account);
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}
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function registerAndTransact(
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Register memory _registerArgs,
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Proof memory _proofArgs,
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ExtData memory _extData
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) public {
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register(_registerArgs);
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transact(_proofArgs, _extData);
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}
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/// TOTHINK security. should we track all incoming trasfers so we can to double check the bridge actually sent tokens to this contract?
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function onTokenBridged(
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IERC6777 _token,
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uint256,
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bytes calldata _data
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) external override {
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require(_token == token, "provided token is not supported");
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require(msg.sender == omniBridge, "only omni bridge"); // we can also get real msg.sender from L1, but it does not matter
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(Register memory _registerArgs, Proof memory _args, ExtData memory _extData) = abi.decode(_data, (Register, Proof, ExtData));
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if (_registerArgs.pubKey.length != 0 && _registerArgs.account.length != 0) {
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register(_registerArgs);
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}
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_transact(_args, _extData);
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}
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}
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