rgnd-rdrand

A simple rngd to collect entropy from Intel's Bull Mountain hwrng using the rdrand instruction and feed it to the kernel's /dev/random pool.

It also throws a bit of extra entropy into /dev/urandom, because rdrand is so cheap so why not?

Building

$ make

Usage

Run as root. It takes no arguments and doesn't fork, so it's easy to run under upstart.

To do

• Find out what capabilities are required and drop to non-root
• Runtime configuration?
• Performance: If there's lots of room in the entropy pool, make one bigger buffer with more entropy rather than repeatedly adding. That syscall is the slowest part of the program.