C-based interface for AES encryption

I'm building an application for the Mac that requires the use of the AES encryption protocol (Rijndael). I have the original C source of the system, but implementing it has proven to be more than my skills can handle. The source requires that the user somehow implement a cipher and key instance. What I need is a simple method that accepts a file handle and the user's desired password (for encryption and decryption). This should be totally do-able in C, which I can then call from within my Obj-C application. The winning solution should be compilable on the Mac, and should include the source code (obviously). It should accept a binary file and password of arbitrary length, and encode using the AES CBC method using a 256 byte key. I'm attaching the complete C source -- the algorithm itself and the API. Both sets are public domain. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows? (depending on the nature? of the deliverables): a)? For web sites or? other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software? installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Mac OS X. Standard ANSI C should suffice.