How would I get the hash of a public certificate's info to be able to perform SSL Pinning in my application?
I am using TrustKit in my iOS application and it is asking for me to set the hash that I am expecting. Where can I get this from?
If it is a public website, you can use SSL Labs server test which computes and displays the pin.
The Public Key Pinning page over at the Mozilla Developer Network also has commands for obtaining the pin from a key file, a certificate signing request, a certificate or a website (this is the one in @mylogon's answer).