Wallet file encryption:

- a keypair is derived from the wallet password
 - only the public key is retained in memory
 - wallets must opened and closed explicitly with the daemon

lib/base_wizard.py

@@ -331,8 +331,8 @@ class BaseWizard(object):
         else:
             self.on_password(None)
 
-    def on_password(self, password):
-        self.storage.put('use_encryption', bool(password))
+    def on_password(self, password, encrypt):
+        self.storage.set_password(password, encrypt)
         for k in self.keystores:
             if k.may_have_password():
                 k.update_password(None, password)