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See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with web3.js. If not, see <http://www.gnu.org/licenses/>. */ /** * @file accounts.js * @author Fabian Vogelsteller <fabian@ethereum.org> * @date 2017 */ "use strict"; var _ = require("underscore"); var core = require('web3-core'); var Method = require('web3-core-method'); var Promise = require('bluebird'); var Account = require("eth-lib/lib/account"); var Hash = require("eth-lib/lib/hash"); var RLP = require("eth-lib/lib/rlp"); var Nat = require("eth-lib/lib/nat"); var Bytes = require("eth-lib/lib/bytes"); var cryp = require('crypto'); var scryptsy = require('scrypt.js'); var uuid = require('uuid'); var utils = require('web3-utils'); var helpers = require('web3-core-helpers'); var isNot = function(value) { return (_.isUndefined(value) || _.isNull(value)); }; var Accounts = function Accounts() { var _this = this; // sets _requestmanager core.packageInit(this, arguments); // remove unecessary core functions delete this.BatchRequest; delete this.extend; var _ethereumCall = [ new Method({ name: 'getId', call: 'net_version', params: 0, outputFormatter: utils.hexToNumber }), new Method({ name: 'getGasPrice', call: 'eth_gasPrice', params: 0 }), new Method({ name: 'getTransactionCount', call: 'eth_getTransactionCount', params: 2, inputFormatter: [function (address) { Eif (utils.isAddress(address)) { return address; } else { throw new Error('Address '+ address +' is not a valid address to get the "transactionCount".'); } }, function () { return 'latest'; }] }) ]; // attach methods to this._ethereumCall this._ethereumCall = {}; _.each(_ethereumCall, function (method) { method.attachToObject(_this._ethereumCall); method.setRequestManager(_this._requestManager); }); this.wallet = new Wallet(this); }; Accounts.prototype._addAccountFunctions = function (account) { var _this = this; // add sign functions account.signTransaction = function signTransaction(tx, callback) { return _this.signTransaction(tx, account.privateKey, callback); }; account.sign = function sign(data) { return _this.sign(data, account.privateKey); }; account.encrypt = function encrypt(password, options) { return _this.encrypt(account.privateKey, password, options); }; return account; }; Accounts.prototype.create = function create(entropy) { return this._addAccountFunctions(Account.create(entropy || utils.randomHex(32))); }; Accounts.prototype.privateKeyToAccount = function privateKeyToAccount(privateKey) { return this._addAccountFunctions(Account.fromPrivate(privateKey)); }; Accounts.prototype.signTransaction = function signTransaction(tx, privateKey, callback) { var _this = this; function signed (tx) { Iif (!tx.gas && !tx.gasLimit) { throw new Error('"gas" is missing'); } var transaction = { nonce: utils.numberToHex(tx.nonce), to: tx.to ? helpers.formatters.inputAddressFormatter(tx.to) : '0x', data: tx.data || '0x', value: tx.value ? utils.numberToHex(tx.value) : "0x", gas: utils.numberToHex(tx.gasLimit || tx.gas), gasPrice: utils.numberToHex(tx.gasPrice), chainId: utils.numberToHex(tx.chainId) }; var rlpEncoded = RLP.encode([ Bytes.fromNat(transaction.nonce), Bytes.fromNat(transaction.gasPrice), Bytes.fromNat(transaction.gas), transaction.to.toLowerCase(), Bytes.fromNat(transaction.value), transaction.data, Bytes.fromNat(transaction.chainId || "0x1"), "0x", "0x"]); var hash = Hash.keccak256(rlpEncoded); var signature = Account.makeSigner(Nat.toNumber(transaction.chainId || "0x1") * 2 + 35)(Hash.keccak256(rlpEncoded), privateKey); var rawTx = RLP.decode(rlpEncoded).slice(0,6).concat(Account.decodeSignature(signature)); var rawTransaction = RLP.encode(rawTx); var values = RLP.decode(rawTransaction); var result = { messageHash: hash, v: values[6], r: values[7], s: values[8], rawTransaction: rawTransaction }; Iif (_.isFunction(callback)) { callback(null, result); } return result; } // Returns synchronously if nonce, chainId and price are provided if (tx.nonce !== undefined && tx.chainId !== undefined && tx.gasPrice !== undefined) { return signed(tx); } // Otherwise, get the missing info from the Ethereum Node return Promise.all([ isNot(tx.chainId) ? _this._ethereumCall.getId() : tx.chainId, isNot(tx.gasPrice) ? _this._ethereumCall.getGasPrice() : tx.gasPrice, isNot(tx.nonce) ? _this._ethereumCall.getTransactionCount(_this.privateKeyToAccount(privateKey).address) : tx.nonce ]).then(function (args) { Iif (isNot(args[0]) || isNot(args[1]) || isNot(args[2])) { throw new Error('One of the values "chainId", "gasPrice", or "nonce" couldn\'t be fetched: '+ JSON.stringify(args)); } return signed(_.extend(tx, {chainId: args[0], gasPrice: args[1], nonce: args[2]})); }); }; Accounts.prototype.recoverTransaction = function recoverTransaction(rawTx) { var values = RLP.decode(rawTx); var signature = Account.encodeSignature(values.slice(6,9)); var recovery = Bytes.toNumber(values[6]); // eslint-disable-next-line no-bitwise var extraData = recovery < 35 ? [] : [Bytes.fromNumber((recovery - 35) >> 1), "0x", "0x"]; var signingData = values.slice(0,6).concat(extraData); var signingDataHex = RLP.encode(signingData); return Account.recover(Hash.keccak256(signingDataHex), signature); }; Accounts.prototype.hashMessage = function hashMessage(data) { var message = utils.isHexStrict(data) ? utils.hexToUtf8(data) : data; var ethMessage = "\x19Ethereum Signed Message:\n" + message.length + message; return Hash.keccak256s(ethMessage); }; Accounts.prototype.sign = function sign(data, privateKey) { var hash = this.hashMessage(data); var signature = Account.sign(hash, privateKey); var vrs = Account.decodeSignature(signature); return { message: data, messageHash: hash, v: vrs[0], r: vrs[1], s: vrs[2], signature: signature }; }; Accounts.prototype.recover = function recover(hash, signature) { if (_.isObject(hash)) { return this.recover(hash.messageHash, Account.encodeSignature([hash.v, hash.r, hash.s])); } if (!utils.isHexStrict(hash)) { hash = this.hashMessage(hash); } if (arguments.length === 4) { return this.recover(hash, Account.encodeSignature([].slice.call(arguments, 1, 4))); // v, r, s } return Account.recover(hash, signature); }; // Taken from https://github.com/ethereumjs/ethereumjs-wallet Accounts.prototype.decrypt = function (v3Keystore, password, nonStrict) { Iif(!_.isString(password)) { throw new Error('No password given.'); } var json = (_.isObject(v3Keystore)) ? v3Keystore : JSON.parse(nonStrict ? v3Keystore.toLowerCase() : v3Keystore); Iif (json.version !== 3) { throw new Error('Not a valid V3 wallet'); } var derivedKey; var kdfparams; if (json.crypto.kdf === 'scrypt') { kdfparams = json.crypto.kdfparams; // FIXME: support progress reporting callback derivedKey = scryptsy(new Buffer(password), new Buffer(kdfparams.salt, 'hex'), kdfparams.n, kdfparams.r, kdfparams.p, kdfparams.dklen); } else Eif (json.crypto.kdf === 'pbkdf2') { kdfparams = json.crypto.kdfparams; Iif (kdfparams.prf !== 'hmac-sha256') { throw new Error('Unsupported parameters to PBKDF2'); } derivedKey = cryp.pbkdf2Sync(new Buffer(password), new Buffer(kdfparams.salt, 'hex'), kdfparams.c, kdfparams.dklen, 'sha256'); } else { throw new Error('Unsupported key derivation scheme'); } var ciphertext = new Buffer(json.crypto.ciphertext, 'hex'); var mac = utils.sha3(Buffer.concat([ derivedKey.slice(16, 32), ciphertext ])).replace('0x',''); Iif (mac !== json.crypto.mac) { throw new Error('Key derivation failed - possibly wrong password'); } var decipher = cryp.createDecipheriv(json.crypto.cipher, derivedKey.slice(0, 16), new Buffer(json.crypto.cipherparams.iv, 'hex')); var seed = '0x'+ Buffer.concat([ decipher.update(ciphertext), decipher.final() ]).toString('hex'); return this.privateKeyToAccount(seed); }; /* eslint-disable complexity */ Accounts.prototype.encrypt = function (privateKey, password, options) { var account = this.privateKeyToAccount(privateKey); options = options || {}; var salt = options.salt || cryp.randomBytes(32); var iv = options.iv || cryp.randomBytes(16); var derivedKey; var kdf = options.kdf || 'scrypt'; var kdfparams = { dklen: options.dklen || 32, salt: salt.toString('hex') }; Iif (kdf === 'pbkdf2') { kdfparams.c = options.c || 262144; kdfparams.prf = 'hmac-sha256'; derivedKey = cryp.pbkdf2Sync(new Buffer(password), salt, kdfparams.c, kdfparams.dklen, 'sha256'); } else Eif (kdf === 'scrypt') { // FIXME: support progress reporting callback kdfparams.n = options.n || 8192; // 2048 4096 8192 16384 kdfparams.r = options.r || 8; kdfparams.p = options.p || 1; derivedKey = scryptsy(new Buffer(password), salt, kdfparams.n, kdfparams.r, kdfparams.p, kdfparams.dklen); } else { throw new Error('Unsupported kdf'); } var cipher = cryp.createCipheriv(options.cipher || 'aes-128-ctr', derivedKey.slice(0, 16), iv); Iif (!cipher) { throw new Error('Unsupported cipher'); } var ciphertext = Buffer.concat([ cipher.update(new Buffer(account.privateKey.replace('0x',''), 'hex')), cipher.final() ]); var mac = utils.sha3(Buffer.concat([ derivedKey.slice(16, 32), new Buffer(ciphertext, 'hex') ])).replace('0x',''); return { version: 3, id: uuid.v4({ random: options.uuid || cryp.randomBytes(16) }), address: account.address.toLowerCase().replace('0x',''), crypto: { ciphertext: ciphertext.toString('hex'), cipherparams: { iv: iv.toString('hex') }, cipher: options.cipher || 'aes-128-ctr', kdf: kdf, kdfparams: kdfparams, mac: mac.toString('hex') } }; }; /* eslint-enable complexity */ // Note: this is trying to follow closely the specs on // http://web3js.readthedocs.io/en/1.0/web3-eth-accounts.html function Wallet(accounts) { this._accounts = accounts; this.length = 0; this.defaultKeyName = "web3js_wallet"; } Wallet.prototype._findSafeIndex = function (pointer) { pointer = pointer || 0; if (_.has(this, pointer)) { return this._findSafeIndex(pointer + 1); } else { return pointer; } }; Wallet.prototype._currentIndexes = function () { var keys = Object.keys(this); var indexes = keys .map(function(key) { return parseInt(key); }) .filter(function(n) { return (n < 9e20); }); return indexes; }; Wallet.prototype.create = function (numberOfAccounts, entropy) { for (var i = 0; i < numberOfAccounts; ++i) { this.add(this._accounts.create(entropy).privateKey); } return this; }; Wallet.prototype.add = function (account) { if (_.isString(account)) { account = this._accounts.privateKeyToAccount(account); } if (!this[account.address]) { account = this._accounts.privateKeyToAccount(account.privateKey); account.index = this._findSafeIndex(); this[account.index] = account; this[account.address] = account; this[account.address.toLowerCase()] = account; this.length++; return account; } else { return this[account.address]; } }; Wallet.prototype.remove = function (addressOrIndex) { var account = this[addressOrIndex]; Eif (account) { // address this[account.address].privateKey = null; delete this[account.address]; // address lowercase this[account.address.toLowerCase()].privateKey = null; delete this[account.address.toLowerCase()]; // index this[account.index].privateKey = null; delete this[account.index]; this.length--; return true; } else { return false; } }; Wallet.prototype.clear = function () { var _this = this; var indexes = this._currentIndexes(); indexes.forEach(function(index) { _this.remove(index); }); return this; }; Wallet.prototype.encrypt = function (password, options) { var _this = this; var indexes = this._currentIndexes(); var accounts = indexes.map(function(index) { return _this[index].encrypt(password, options); }); return accounts; }; Wallet.prototype.decrypt = function (encryptedWallet, password) { var _this = this; encryptedWallet.forEach(function (keystore) { var account = _this._accounts.decrypt(keystore, password); Eif (account) { _this.add(account); } else { throw new Error('Couldn\'t decrypt accounts. Password wrong?'); } }); return this; }; Wallet.prototype.save = function (password, keyName) { localStorage.setItem(keyName || this.defaultKeyName, JSON.stringify(this.encrypt(password))); return true; }; Wallet.prototype.load = function (password, keyName) { var keystore = localStorage.getItem(keyName || this.defaultKeyName); if (keystore) { try { keystore = JSON.parse(keystore); } catch(e) { } } return this.decrypt(keystore || [], password); }; Eif (typeof localStorage === 'undefined') { delete Wallet.prototype.save; delete Wallet.prototype.load; } module.exports = Accounts; |