A framework written in Objective-C that wraps the bignumber functions of the OpenSSL suite for easier use in Mac OS applications.
This project has moved to: http://github.com/davedelong/CHMath
This looks like a pretty good framework. It uses the OpenSSL library underneath, so it's simply a wrapper around tried-and-tested code. However, the code was written with garbage collection in mind, so there are some strange memory leaks in there that I'm submitting a patch to fix.
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