1 files changed, 41 insertions, 0 deletions
diff --git a/app/scripts/keyrings/simple.js b/app/scripts/keyrings/simple.js
index 59d4691c6..6c5af1884 100644
--- a/app/scripts/keyrings/simple.js
+++ b/app/scripts/keyrings/simple.js
@@ -1,5 +1,6 @@
 const EventEmitter = require('events').EventEmitter
 const Wallet = require('ethereumjs-wallet')
+const ethUtil = require('ethereumjs-util')
 const type = 'Simple Key Pair'
 
 module.exports = class SimpleKeyring extends EventEmitter {
@@ -40,4 +41,44 @@ module.exports = class SimpleKeyring extends EventEmitter {
     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(concatSig(msgSig.v, msgSig.r, msgSig.s))
+    return rawMsgSig
+  }
+
+  getWalletForAccount(account) {
+    return this.wallets.find(w => w.getAddress().toString('hex') === account)
+  }
+
+}
+
+function concatSig (v, r, s) {
+  const rSig = ethUtil.fromSigned(r)
+  const sSig = ethUtil.fromSigned(s)
+  const vSig = ethUtil.bufferToInt(v)
+  const rStr = padWithZeroes(ethUtil.toUnsigned(rSig).toString('hex'), 64)
+  const sStr = padWithZeroes(ethUtil.toUnsigned(sSig).toString('hex'), 64)
+  const vStr = ethUtil.stripHexPrefix(ethUtil.intToHex(vSig))
+  return ethUtil.addHexPrefix(rStr.concat(sStr, vStr)).toString('hex')
+}
+
+function padWithZeroes (number, length) {
+  var myString = '' + number
+  while (myString.length < length) {
+    myString = '0' + myString
+  }
+  return myString
 }