Fix password validation and persistence issue

Was wiping the vault on each successful password attempt... :P

app/scripts/keyring-controller.js

@@ -131,9 +131,7 @@ module.exports = class KeyringController extends EventEmitter {
         this.keyrings.push(keyring)
         this.configManager.setSelectedAccount(keyring.getAccounts()[0])
       }
-      return this.persistAllKeyrings().then(() => {
-        return key
-      })
+      return key
     })
   }
 
@@ -143,6 +141,9 @@ module.exports = class KeyringController extends EventEmitter {
     configManager.setSalt(salt)
 
     return this.migrateAndGetKey(password)
+    .then(() => {
+      return this.persistAllKeyrings()
+    })
     .then(() => {
       cb(null)
     })
@@ -173,7 +174,7 @@ module.exports = class KeyringController extends EventEmitter {
     })
   }
 
-  placeSeedWords () {
+  placeSeedWords (cb) {
     const firstKeyring = this.keyrings[0]
     const seedWords = firstKeyring.serialize().mnemonic
     this.configManager.setSeedWords(seedWords)

app/scripts/lib/encryptor.js

@@ -69,6 +69,9 @@ function decryptWithKey (key, text) {
     const decryptedObj = JSON.parse(decryptedStr)
     return decryptedObj
   })
+  .catch(function(reason) {
+    throw new Error('Incorrect password')
+  })
 }
 
 function convertStringToArrayBufferView (str) {

test/integration/lib/encryptor-test.js

@@ -43,3 +43,25 @@ QUnit.test('encryptor:encrypt & decrypt', function(assert) {
   })
 
 })
+
+QUnit.test('encryptor:encrypt & decrypt with wrong password', function(assert) {
+  var done = assert.async();
+  var password, data, encrypted, wrongPassword
+
+  password = 'a sample passw0rd'
+  wrongPassword = 'a wrong password'
+  data = { foo: 'data to encrypt' }
+
+  encryptor.encrypt(password, data)
+  .then(function(encryptedStr) {
+    assert.equal(typeof encryptedStr, 'string', 'returns a string')
+    return encryptor.decrypt(wrongPassword, encryptedStr)
+  })
+  .then(function (decryptedObj) {
+    assert.equal(!decryptedObj, true, 'Wrong password should not decrypt')
+    done()
+  })
+  .catch(function(reason) {
+    done()
+  })
+})