title: Use KeyPairGeneratorSpec for Android API level < 18?
body: <p>I want to store secret data in the private keystore of my app.</p>
  
  <p>However, as I was working on the code to do this, Android Studio warned that <code>KeyPairGeneratorSpec.Builder(context)</code> requires API level 18 and I'm targeting 14 as a minimum.  :-(</p>
  
  <p>How can I store secret data in my app for Android API level 14 through 17 ?</p>