wip

contracts/ERC20Tornado.sol

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 // https://tornado.cash
 /*
 * d888888P                                           dP              a88888b.                   dP
@@ -9,7 +11,7 @@
 * ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
 */
 
-pragma solidity 0.5.17;
+pragma solidity 0.6.12;
 
 import "./Tornado.sol";
 
@@ -18,11 +20,11 @@ contract ERC20Tornado is Tornado {
 
   constructor(
     IVerifier _verifier,
+    Hasher _hasher,
     uint256 _denomination,
     uint32 _merkleTreeHeight,
-    address _operator,
     address _token
-  ) Tornado(_verifier, _denomination, _merkleTreeHeight, _operator) public {
+  ) Tornado(_verifier, _hasher, _denomination, _merkleTreeHeight) public {
     token = _token;
   }
 

contracts/ETHTornado.sol

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT
+// SPDX-License-Identifier: MIT
+
 // https://tornado.cash
 /*
 * d888888P                                           dP              a88888b.                   dP
@@ -9,17 +12,17 @@
 * ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
 */
 
-pragma solidity 0.5.17;
+pragma solidity 0.6.12;
 
 import "./Tornado.sol";
 
 contract ETHTornado is Tornado {
   constructor(
     IVerifier _verifier,
+    Hasher _hasher,
     uint256 _denomination,
-    uint32 _merkleTreeHeight,
-    address _operator
-  ) Tornado(_verifier, _denomination, _merkleTreeHeight, _operator) public {
+    uint32 _merkleTreeHeight
+  ) Tornado(_verifier, _hasher, _denomination, _merkleTreeHeight) public {
   }
 
   function _processDeposit() internal {

contracts/MerkleTreeWithHistory.sol

@@ -1,3 +1,6 @@
+// SPDX-License-Identifier: MIT
+// SPDX-License-Identifier: MIT
+
 // https://tornado.cash
 /*
 * d888888P                                           dP              a88888b.                   dP
@@ -9,9 +12,9 @@
 * ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
 */
 
-pragma solidity 0.5.17;
+pragma solidity 0.6.12;
 
-library Hasher {
+interface Hasher {
   function MiMCSponge(uint256 in_xL, uint256 in_xR) public pure returns (uint256 xL, uint256 xR);
 }
 
@@ -29,12 +32,15 @@ contract MerkleTreeWithHistory {
   uint32 public nextIndex = 0;
   uint32 public constant ROOT_HISTORY_SIZE = 100;
   bytes32[ROOT_HISTORY_SIZE] public roots;
+  Hasher public immutable hasher;
 
-  constructor(uint32 _treeLevels) public {
+  constructor(uint32 _treeLevels, Hasher _hasher) public {
     require(_treeLevels > 0, "_treeLevels should be greater than zero");
     require(_treeLevels < 32, "_treeLevels should be less than 32");
     levels = _treeLevels;
 
+    hasher = _hasher;
+
     bytes32 currentZero = bytes32(ZERO_VALUE);
     zeros.push(currentZero);
     filledSubtrees.push(currentZero);
@@ -56,9 +62,9 @@ contract MerkleTreeWithHistory {
     require(uint256(_right) < FIELD_SIZE, "_right should be inside the field");
     uint256 R = uint256(_left);
     uint256 C = 0;
-    (R, C) = Hasher.MiMCSponge(R, C);
+    (R, C) = hasher.MiMCSponge(R, C);
     R = addmod(R, uint256(_right), FIELD_SIZE);
-    (R, C) = Hasher.MiMCSponge(R, C);
+    (R, C) = hasher.MiMCSponge(R, C);
     return bytes32(R);
   }
 

contracts/Migrations.sol

@@ -1,4 +1,6 @@
-pragma solidity >=0.4.21 <0.6.0;
+// SPDX-License-Identifier: MIT
+
+pragma solidity 0.6.12;
 
 contract Migrations {
   address public owner;

contracts/Mocks/BadRecipient.sol

@@ -1,7 +1,9 @@
-pragma solidity ^0.5.0;
+// SPDX-License-Identifier: MIT
+
+pragma solidity 0.6.12;
 
 contract BadRecipient {
-  function() external {
+  fallback() external {
     require(false, "this contract does not accept ETH");
   }
 }

contracts/Mocks/ERC20Mock.sol

@@ -1,10 +1,10 @@
-pragma solidity ^0.5.0;
+// SPDX-License-Identifier: MIT
+
+pragma solidity 0.6.12;
 
 import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
-import "@openzeppelin/contracts/token/ERC20/ERC20Mintable.sol";
-import "@openzeppelin/contracts/token/ERC20/ERC20Detailed.sol";
 
-contract ERC20Mock is ERC20Detailed, ERC20Mintable {
-  constructor() ERC20Detailed("DAIMock", "DAIM", 18) public {
+contract ERC20Mock is ERC20 {
+  constructor() ERC20("DAIMock", "DAIM") public {
   }
 }

contracts/Mocks/IUSDT.sol

@@ -1,10 +1,12 @@
-pragma solidity 0.5.17;
+// SPDX-License-Identifier: MIT
 
-contract ERC20Basic {
+pragma solidity 0.6.12;
+
+interface ERC20Basic {
     uint public _totalSupply;
-    function totalSupply() public view returns (uint);
-    function balanceOf(address who) public view returns (uint);
-    function transfer(address to, uint value) public;
+    function totalSupply() external view returns (uint);
+    function balanceOf(address who) external view returns (uint);
+    function transfer(address to, uint value) external;
     event Transfer(address indexed from, address indexed to, uint value);
 }
 
@@ -12,9 +14,9 @@ contract ERC20Basic {
  * @title ERC20 interface
  * @dev see https://github.com/ethereum/EIPs/issues/20
  */
-contract IUSDT is ERC20Basic {
-    function allowance(address owner, address spender) public view returns (uint);
-    function transferFrom(address from, address to, uint value) public;
-    function approve(address spender, uint value) public;
+interface IUSDT is ERC20Basic {
+    function allowance(address owner, address spender) external view returns (uint);
+    function transferFrom(address from, address to, uint value) external;
+    function approve(address spender, uint value) external;
     event Approval(address indexed owner, address indexed spender, uint value);
 }

contracts/Mocks/MerkleTreeWithHistoryMock.sol

@@ -1,10 +1,12 @@
-pragma solidity 0.5.17;
+// SPDX-License-Identifier: MIT
+
+pragma solidity 0.6.12;
 
 import '../MerkleTreeWithHistory.sol';
 
 contract MerkleTreeWithHistoryMock is MerkleTreeWithHistory {
 
-  constructor (uint32 _treeLevels) MerkleTreeWithHistory(_treeLevels) public {}
+  constructor (uint32 _treeLevels, Hasher _hasher) MerkleTreeWithHistory(_treeLevels, _hasher) public {}
 
   function insert(bytes32 _leaf) public {
       _insert(_leaf);

contracts/Tornado.sol

@@ -1,3 +1,5 @@
+// SPDX-License-Identifier: MIT
+
 // https://tornado.cash
 /*
 * d888888P                                           dP              a88888b.                   dP
@@ -9,7 +11,7 @@
 * ooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo
 */
 
-pragma solidity 0.5.17;
+pragma solidity 0.6.12;
 
 import "./MerkleTreeWithHistory.sol";
 import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
@@ -23,7 +25,7 @@ contract Tornado is MerkleTreeWithHistory, ReentrancyGuard {
   mapping(bytes32 => bool) public nullifierHashes;
   // we store all commitments just to prevent accidental deposits with the same commitment
   mapping(bytes32 => bool) public commitments;
-  IVerifier public verifier;
+  IVerifier public immutable verifier;
 
   // operator can update snark verification key
   // after the final trusted setup ceremony operator rights are supposed to be transferred to zero address
@@ -45,13 +47,12 @@ contract Tornado is MerkleTreeWithHistory, ReentrancyGuard {
   */
   constructor(
     IVerifier _verifier,
+    Hasher _hasher,
     uint256 _denomination,
-    uint32 _merkleTreeHeight,
-    address _operator
-  ) MerkleTreeWithHistory(_merkleTreeHeight) public {
+    uint32 _merkleTreeHeight
+  ) MerkleTreeWithHistory(_merkleTreeHeight, _hasher) public {
     require(_denomination > 0, "denomination should be greater than 0");
     verifier = _verifier;
-    operator = _operator;
     denomination = _denomination;
   }
 
@@ -70,7 +71,7 @@ contract Tornado is MerkleTreeWithHistory, ReentrancyGuard {
   }
 
   /** @dev this function is defined in a child contract */
-  function _processDeposit() internal;
+  function _processDeposit() internal virtual;
 
   /**
     @dev Withdraw a deposit from the contract. `proof` is a zkSNARK proof data, and input is an array of circuit public inputs
@@ -92,7 +93,7 @@ contract Tornado is MerkleTreeWithHistory, ReentrancyGuard {
   }
 
   /** @dev this function is defined in a child contract */
-  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal;
+  function _processWithdraw(address payable _recipient, address payable _relayer, uint256 _fee, uint256 _refund) internal virtual;
 
   /** @dev whether a note is already spent */
   function isSpent(bytes32 _nullifierHash) public view returns(bool) {
@@ -109,16 +110,4 @@ contract Tornado is MerkleTreeWithHistory, ReentrancyGuard {
     }
   }
 
-  /**
-    @dev allow operator to update SNARK verification keys. This is needed to update keys after the final trusted setup ceremony is held.
-    After that operator rights are supposed to be transferred to zero address
-  */
-  function updateVerifier(address _newVerifier) external onlyOperator {
-    verifier = IVerifier(_newVerifier);
-  }
-
-  /** @dev operator can change his address */
-  function changeOperator(address _newOperator) external onlyOperator {
-    operator = _newOperator;
-  }
 }

package.json

@@ -27,7 +27,7 @@
   "author": "",
   "license": "ISC",
   "dependencies": {
-    "@openzeppelin/contracts": "^2.4.0",
+    "@openzeppelin/contracts": "^3.4.0",
     "@truffle/contract": "^4.0.39",
     "@truffle/hdwallet-provider": "^1.0.24",
     "axios": "^0.19.0",

truffle-config.js

@@ -1,6 +1,6 @@
-require('dotenv').config()
-const HDWalletProvider = require('@truffle/hdwallet-provider')
-const utils = require('web3-utils')
+require("dotenv").config();
+const HDWalletProvider = require("@truffle/hdwallet-provider");
+const utils = require("web3-utils");
 // const infuraKey = "fj4jll3k.....";
 //
 // const fs = require('fs');
@@ -25,9 +25,9 @@ module.exports = {
     // options below to some value.
 
     development: {
-      host: '127.0.0.1',     // Localhost (default: none)
-      port: 8545,            // Standard Ethereum port (default: none)
-      network_id: '*',       // Any network (default: none)
+      host: "127.0.0.1", // Localhost (default: none)
+      port: 8545, // Standard Ethereum port (default: none)
+      network_id: "*", // Any network (default: none)
     },
 
     // Another network with more advanced options...
@@ -43,31 +43,56 @@ module.exports = {
     // Useful for deploying to a public network.
     // NB: It's important to wrap the provider as a function.
     kovan: {
-      provider: () => new HDWalletProvider(process.env.PRIVATE_KEY, 'https://kovan.infura.io/v3/97c8bf358b9942a9853fab1ba93dc5b3'),
+      provider: () =>
+        new HDWalletProvider(
+          process.env.PRIVATE_KEY,
+          "https://kovan.infura.io/v3/97c8bf358b9942a9853fab1ba93dc5b3"
+        ),
       network_id: 42,
       gas: 6000000,
-      gasPrice: utils.toWei('1', 'gwei'),
+      gasPrice: utils.toWei("1", "gwei"),
       // confirmations: 0,
       // timeoutBlocks: 200,
-      skipDryRun: true
+      skipDryRun: true,
+    },
+    goerli: {
+      provider: () =>
+        new HDWalletProvider(
+          process.env.PRIVATE_KEY,
+          "https://goerli.infura.io/v3/d34c08f2cb7c4111b645d06ac7e35ba8"
+        ),
+      network_id: 5,
+      gas: 6000000,
+      gasPrice: utils.toWei("1", "gwei"),
+      // confirmations: 0,
+      // timeoutBlocks: 200,
+      skipDryRun: true,
     },
     rinkeby: {
-      provider: () => new HDWalletProvider(process.env.PRIVATE_KEY, 'https://rinkeby.infura.io/v3/97c8bf358b9942a9853fab1ba93dc5b3'),
+      provider: () =>
+        new HDWalletProvider(
+          process.env.PRIVATE_KEY,
+          "https://rinkeby.infura.io/v3/97c8bf358b9942a9853fab1ba93dc5b3"
+        ),
       network_id: 4,
       gas: 6000000,
-      gasPrice: utils.toWei('1', 'gwei'),
+      gasPrice: utils.toWei("1", "gwei"),
       // confirmations: 0,
       // timeoutBlocks: 200,
-      skipDryRun: true
+      skipDryRun: true,
     },
     mainnet: {
-      provider: () => new HDWalletProvider(process.env.PRIVATE_KEY, 'http://ethereum-rpc.trustwalletapp.com'),
+      provider: () =>
+        new HDWalletProvider(
+          process.env.PRIVATE_KEY,
+          "http://ethereum-rpc.trustwalletapp.com"
+        ),
       network_id: 1,
       gas: 6000000,
-      gasPrice: utils.toWei('2', 'gwei'),
+      gasPrice: utils.toWei("2", "gwei"),
       // confirmations: 0,
       // timeoutBlocks: 200,
-      skipDryRun: true
+      skipDryRun: true,
     },
 
     // Useful for private networks
@@ -86,21 +111,24 @@ module.exports = {
   // Configure your compilers
   compilers: {
     solc: {
-      version: '0.5.17',    // Fetch exact version from solc-bin (default: truffle's version)
+      version: "0.6.12", // Fetch exact version from solc-bin (default: truffle's version)
       // docker: true,        // Use "0.5.1" you've installed locally with docker (default: false)
-      settings: {          // See the solidity docs for advice about optimization and evmVersion
+      settings: {
+        // See the solidity docs for advice about optimization and evmVersion
         optimizer: {
           enabled: true,
-          runs: 200
+          runs: 200,
         },
         // evmVersion: "byzantium"
-      }
+      },
     },
     external: {
-      command: 'node ./compileHasher.js',
-      targets: [{
-        path: './build/Hasher.json'
-      }]
-    }
-  }
-}
+      command: "node ./compileHasher.js",
+      targets: [
+        {
+          path: "./build/Hasher.json",
+        },
+      ],
+    },
+  },
+};