how to get OAuth Consumer Key / Secret for Google OAuth

I spent a hour to understand how to generate OAuth comsumer key for Google OAuth.
Here is the easiest way to do it.

step 0> visit Manage Domains Tool

step 1> Insert meta tag in your html and upload it server that is running.

step 2> after uploading the page, click verify. And then you'll see a page like this in you google master.

step 3> Generating keys using OpenSSL. I assume you're using OS X. Do this in your terminal

step4> Upload myrsacert.pem