Daniel Eran Dilger, writing for AppleInsider:

Building its own security software meant that Apple and its developers were no longer captive to the external development issues and eccentricities related to the OpenSSL open source project, which despite its critical importance and broad use by the industry, was being funded through donations and was, incredibly, maintained by a very small team of just four core developers.

Interesting piece about Apple deciding to build their own cryptography API.