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111 lines
2.8 KiB
111 lines
2.8 KiB
const EventEmitter = require('events').EventEmitter
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const hdkey = require('ethereumjs-wallet/hdkey')
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const bip39 = require('bip39')
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const ethUtil = require('ethereumjs-util')
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// *Internal Deps
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const sigUtil = require('../lib/sig-util')
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// Options:
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const hdPathString = `m/44'/60'/0'/0`
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const type = 'HD Key Tree'
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class HdKeyring extends EventEmitter {
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/* PUBLIC METHODS */
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constructor (opts = {}) {
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super()
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this.type = type
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this.deserialize(opts)
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}
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serialize () {
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return Promise.resolve({
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mnemonic: this.mnemonic,
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numberOfAccounts: this.wallets.length,
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})
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}
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deserialize (opts = {}) {
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this.opts = opts || {}
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this.wallets = []
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this.mnemonic = null
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this.root = null
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if (opts.mnemonic) {
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this._initFromMnemonic(opts.mnemonic)
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}
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if (opts.numberOfAccounts) {
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return this.addAccounts(opts.numberOfAccounts)
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}
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return Promise.resolve([])
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}
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addAccounts (numberOfAccounts = 1) {
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if (!this.root) {
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this._initFromMnemonic(bip39.generateMnemonic())
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}
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const oldLen = this.wallets.length
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const newWallets = []
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for (let i = oldLen; i < numberOfAccounts + oldLen; i++) {
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const child = this.root.deriveChild(i)
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const wallet = child.getWallet()
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newWallets.push(wallet)
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this.wallets.push(wallet)
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}
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const hexWallets = newWallets.map(w => w.getAddress().toString('hex'))
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return Promise.resolve(hexWallets)
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}
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getAccounts () {
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return Promise.resolve(this.wallets.map(w => w.getAddress().toString('hex')))
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}
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// tx is an instance of the ethereumjs-transaction class.
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signTransaction (address, tx) {
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const wallet = this._getWalletForAccount(address)
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var privKey = wallet.getPrivateKey()
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tx.sign(privKey)
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return Promise.resolve(tx)
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}
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// For eth_sign, we need to sign transactions:
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signMessage (withAccount, data) {
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const wallet = this._getWalletForAccount(withAccount)
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const message = ethUtil.removeHexPrefix(data)
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var privKey = wallet.getPrivateKey()
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var msgSig = ethUtil.ecsign(new Buffer(message, 'hex'), privKey)
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var rawMsgSig = ethUtil.bufferToHex(sigUtil.concatSig(msgSig.v, msgSig.r, msgSig.s))
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return Promise.resolve(rawMsgSig)
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}
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exportAccount (address) {
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const wallet = this._getWalletForAccount(address)
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return Promise.resolve(wallet.getPrivateKey().toString('hex'))
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}
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/* PRIVATE METHODS */
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_initFromMnemonic (mnemonic) {
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this.mnemonic = mnemonic
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const seed = bip39.mnemonicToSeed(mnemonic)
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this.hdWallet = hdkey.fromMasterSeed(seed)
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this.root = this.hdWallet.derivePath(hdPathString)
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}
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_getWalletForAccount (account) {
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return this.wallets.find((w) => {
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const address = w.getAddress().toString('hex')
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return ((address === account) || (sigUtil.normalize(address) === account))
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})
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}
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}
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HdKeyring.type = type
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module.exports = HdKeyring
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