Is it possible to use AES128 with GCM mode on iOS?

Question

So my question for you stackoverflow geniuses is: if there a way (native, library, framework, whatever..) to encrypt data with AES (preferably 128 but could

Answer 1

RNCryptor uses a HMAC, which is considered a cryptographically strong method of creating an authentication tag. It is open source as well. So I would seriously consider cloning RNCryptor code for this (keep the copyright in the header intact!).

Password based encryption consists of deriving a keys (and possibly an IV), then performing the encryption and authentication. So you should get a long way by simply removing the key derivation part.

The only time when this doesn't work is if the code for key derivation is woven into the part that does the encryption/authentication, but this does not seem to be the case for RNCryptor.