Aren't you talking about the Linux kernel? There the very last step is XOR'ing t...

		Perseids on Dec 11, 2013 \| parent \| context \| favorite \| on: “We cannot trust” Intel and Via’s chip-based crypt... Aren't you talking about the Linux kernel? There the very last step is XOR'ing the random output with the hardware RNG. The article explicitly mentions Yarrow as a mixing and CSRNG function for FreeBSD though.