Is SHA-256 Case Insensitive?

Question

I\'m running a service that is using SHA-256 on two sides of the application - one is a server-side PHP implementation and the other is a client-side iOS implementation. The

Answer 1

All SHA series are binary algorithms they know nothing about case, so they can't be case insensitive.
You can simply test this on single machine with 2 outputs from one string with different cases and you can see that they provide different results.
In your case I think if every thing is ok, possibly iOS show capitalized string in the phone but internally pass you normal( lower case ) string