This frameworks wraps some public domain cryptography implementations in Objective-C. It contains two digest algorithms MD-5, SHA-1 (CRC32 as a build option) as well as two symmetric ciphers Blowfish and Twofish. There is a small test application for Mac OS X that can be used to test the algorithms a bit. Documentation is in a README.rtf file and the various headers.
The digest algortihms have been tested on Mac OS X and passed the tests. So I assume, that they work as expected. The crypto routines encrypt and decrypt correctly. I have not checked that the output is compatible with their respective implementations on Intel machinery, though I assume that it is.
Please inspect the headers for copyright notices and further hints.
Feedback to Nat!