How can I compute a SHA-2 (ideally SHA 256 or SHA 512) hash in iOS?

Question

The Security services API doesn\'t appear to allow me to compute a hash directly. There are plenty of public domain and liberally licensed versions available, but I\'d rathe

Answer 1

Below link i used for creating document hash value and Its very simple and easy to calculate hash value specially for large files.

Link : http://www.joel.lopes-da-silva.com/2010/09/07/compute-md5-or-sha-hash-of-large-file-efficiently-on-ios-and-mac-os-x/comment-page-1/#comment-18533