I haven't looked into the details of this patchset yet, but your description here indicates to me that this is motivated by FIPS certification desires, which...worries me. I would like to rewrite the RNG at some point, and I've started to work on a bunch of designs for this (and proving them correct, too), but going about this via FIPS certification or trying to implement some NIST specs is most certainly the wrong way to go about this, will lock us into subpar crypto for years, and is basically a waste of time.
