Merge pull request #1005 from MetaMask/dev

Merge dev into master!

1 files changed, 111 insertions, 0 deletions

diff --git a/app/scripts/keyrings/hd.js b/app/scripts/keyrings/hd.js
new file mode 100644
index 000000000..80b713b58
--- /dev/null
+++ b/app/scripts/keyrings/hd.js
@@ -0,0 +1,111 @@
+const EventEmitter = require('events').EventEmitter
+const hdkey = require('ethereumjs-wallet/hdkey')
+const bip39 = require('bip39')
+const ethUtil = require('ethereumjs-util')
+
+// *Internal Deps
+const sigUtil = require('../lib/sig-util')
+
+// Options:
+const hdPathString = `m/44'/60'/0'/0`
+const type = 'HD Key Tree'
+
+class HdKeyring extends EventEmitter {
+
+  /* PUBLIC METHODS */
+
+  constructor (opts = {}) {
+    super()
+    this.type = type
+    this.deserialize(opts)
+  }
+
+  serialize () {
+    return Promise.resolve({
+      mnemonic: this.mnemonic,
+      numberOfAccounts: this.wallets.length,
+    })
+  }
+
+  deserialize (opts = {}) {
+    this.opts = opts || {}
+    this.wallets = []
+    this.mnemonic = null
+    this.root = null
+
+    if (opts.mnemonic) {
+      this._initFromMnemonic(opts.mnemonic)
+    }
+
+    if (opts.numberOfAccounts) {
+      return this.addAccounts(opts.numberOfAccounts)
+    }
+
+    return Promise.resolve([])
+  }
+
+  addAccounts (numberOfAccounts = 1) {
+    if (!this.root) {
+      this._initFromMnemonic(bip39.generateMnemonic())
+    }
+
+    const oldLen = this.wallets.length
+    const newWallets = []
+    for (let i = oldLen; i < numberOfAccounts + oldLen; i++) {
+      const child = this.root.deriveChild(i)
+      const wallet = child.getWallet()
+      newWallets.push(wallet)
+      this.wallets.push(wallet)
+    }
+    const hexWallets = newWallets.map(w => w.getAddress().toString('hex'))
+    return Promise.resolve(hexWallets)
+  }
+
+  getAccounts () {
+    return Promise.resolve(this.wallets.map(w => w.getAddress().toString('hex')))
+  }
+
+  // tx is an instance of the ethereumjs-transaction class.
+  signTransaction (address, tx) {
+    const wallet = this._getWalletForAccount(address)
+    var privKey = wallet.getPrivateKey()
+    tx.sign(privKey)
+    return Promise.resolve(tx)
+  }
+
+  // For eth_sign, we need to sign transactions:
+  signMessage (withAccount, data) {
+    const wallet = this._getWalletForAccount(withAccount)
+    const message = ethUtil.removeHexPrefix(data)
+    var privKey = wallet.getPrivateKey()
+    var msgSig = ethUtil.ecsign(new Buffer(message, 'hex'), privKey)
+    var rawMsgSig = ethUtil.bufferToHex(sigUtil.concatSig(msgSig.v, msgSig.r, msgSig.s))
+    return Promise.resolve(rawMsgSig)
+  }
+
+  exportAccount (address) {
+    const wallet = this._getWalletForAccount(address)
+    return Promise.resolve(wallet.getPrivateKey().toString('hex'))
+  }
+
+
+  /* PRIVATE METHODS */
+
+  _initFromMnemonic (mnemonic) {
+    this.mnemonic = mnemonic
+    const seed = bip39.mnemonicToSeed(mnemonic)
+    this.hdWallet = hdkey.fromMasterSeed(seed)
+    this.root = this.hdWallet.derivePath(hdPathString)
+  }
+
+
+  _getWalletForAccount (account) {
+    return this.wallets.find((w) => {
+      const address = w.getAddress().toString('hex')
+      return ((address === account) || (sigUtil.normalize(address) === account))
+    })
+  }
+}
+
+HdKeyring.type = type
+module.exports = HdKeyring