1 files changed, 107 insertions, 0 deletions
diff --git a/app/scripts/keyrings/hd.js b/app/scripts/keyrings/hd.js
new file mode 100644
index 000000000..4bfc56c15
--- /dev/null
+++ b/app/scripts/keyrings/hd.js
@@ -0,0 +1,107 @@
+const EventEmitter = require('events').EventEmitter
+const hdkey = require('ethereumjs-wallet/hdkey')
+const bip39 = require('bip39')
+const ethUtil = require('ethereumjs-util')
+const type = 'HD Key Tree'
+const sigUtil = require('../lib/sig-util')
+
+const hdPathString = `m/44'/60'/0'/0`
+
+module.exports = class HdKeyring extends EventEmitter {
+
+  static type() {
+    return type
+  }
+
+  constructor(opts = {}) {
+    super()
+    this.type = type
+    this.deserialize(opts)
+  }
+
+  deserialize(opts = {}) {
+    this.opts = opts || {}
+    this.wallets = []
+    this.mnemonic = null
+    this.root = null
+
+    if ('mnemonic' in opts) {
+      this.initFromMnemonic(opts.mnemonic)
+    }
+
+    if ('n' in opts) {
+      this.addAccounts(opts.n)
+    }
+  }
+
+  initFromMnemonic(mnemonic) {
+    this.mnemonic = mnemonic
+    const seed = bip39.mnemonicToSeed(mnemonic)
+    this.hdWallet = hdkey.fromMasterSeed(seed)
+    this.root = this.hdWallet.derivePath(hdPathString)
+  }
+
+  serialize() {
+    return {
+      mnemonic: this.mnemonic,
+      n: this.wallets.length,
+    }
+  }
+
+  exportAccount(address) {
+    const wallet = this.getWalletForAccount(address)
+    return wallet.getPrivateKey().toString('hex')
+  }
+
+  addAccounts(n = 1) {
+    if (!this.root) {
+      this.initFromMnemonic(bip39.generateMnemonic())
+    }
+
+    const oldLen = this.wallets.length
+    const newWallets = []
+    for (let i = oldLen; i < n + oldLen; i++) {
+      const child = this.root.deriveChild(i)
+      const wallet = child.getWallet()
+      newWallets.push(wallet)
+      this.wallets.push(wallet)
+    }
+    return newWallets.map(w => w.getAddress().toString('hex'))
+  }
+
+  getAccounts() {
+    return 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 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 rawMsgSig
+  }
+
+  getWalletForAccount(account) {
+    return this.wallets.find((w) => {
+      const address = w.getAddress().toString('hex')
+      return ((address === account) || (normalize(address) === account))
+    })
+  }
+
+
+
+}
+
+function normalize(address) {
+  return ethUtil.addHexPrefix(address.toLowerCase())
+}