title: Convert der certificate to p12
body: <p>I am trying to upload my adobe air app to Google Play. I have opted in for Google Play App Signing and cannot opt out now. They provide me with .der certificate which I wish to convert to p12 in order to use it in my adobe AIR app. I know this can be done through openSSL but I did not get any perfect tutorial to do so. Can anyone point me to the right steps to make this conversion?</p>