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| /*
This file is part of web3.js.
web3.js is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
web3.js is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 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 Promise = require('bluebird');
var Account = require("eth-lib/src/account");
var Hash = require("eth-lib/src/hash");
var RLP = require("eth-lib/src/rlp");
var crypto = 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(eth) {
if (eth) {
this.eth = (eth.eth) ? eth.eth : eth;
}
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 hash = Hash.keccak256(Account.transactionSigningData(transaction));
var rawTransaction = Account.signTransaction(transaction, privateKey);
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);
}
Iif (!_this || !_this.eth || !_this.eth.net) {
return Promise.reject(new Error('The Eth package is set bound. Please set using "accounts.eth = eth", or provide "nonce", "chainId" and "gasPrice" in the transaction yourself.'));
}
// Otherwise, get the missing info from the Ethereum Node
return Promise.all([
isNot(tx.chainId) ? _this.eth.net.getId() : tx.chainId,
isNot(tx.gasPrice) ? _this.eth.getGasPrice() : tx.gasPrice,
isNot(tx.nonce) ? _this.eth.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) {
return Account.recoverTransaction(rawTx);
};
Accounts.prototype.hashMessage = function hashMessage(data) {
var message = utils.isHex(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.isHex(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) {
/* jshint maxcomplexity: 10 */
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 = crypto.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 = crypto.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);
};
Accounts.prototype.encrypt = function (privateKey, password, options) {
/* jshint maxcomplexity: 20 */
var account = this.privateKeyToAccount(privateKey);
options = options || {};
var salt = options.salt || crypto.randomBytes(32);
var iv = options.iv || crypto.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 = crypto.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 = crypto.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 || crypto.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')
}
};
};
// 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.length = 0;
this._accounts = accounts;
this.defaultKeyName = "web3js_wallet";
}
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.length;
this[this.length] = 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 length = this.length;
for (var i = 0; i < length; i++) {
this.remove(i);
}
return this;
};
Wallet.prototype.encrypt = function (password, options) {
var accounts = [];
for (var i = 0; i < this.length; i++) {
accounts[i] = this[i].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);
if (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;
|