>>>Depends what you're doing- most functions now are in a C++ dll, plus you can inline C++ or ASM which is how we do AES encryption: the C++ is inlined right there in the VFP procedure and gets compiled as native C++ when Make is called to generate the dll.
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>>You can do AES with api calls
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>using open source implementations seems more prudent in light of NSA un-salting (so to speak) key generation and perhaps having forced back-door-angel approaches into closed APIs

I have my implementation of AES + Rijndael in C#
Even in native foxpro - not as fast as API, but acceptable for small strings ( a couple of kB)