Dear DragonFlyBSD bugs. DragonFly uses Bob Jenkins' IBAA CSPRNG for /dev/random.
I have been doing some work on this CSPRNG, which is available from: http://www.leopard.uk.com/IBAA64 I have two recommendations to make with regard to the IBAA CSPRNG which is used in DragonFly: (1) Use my rounded up BETA=32/SHIFT=20 values as opposed to the original SHIFT=19 value in the original IBAA CSPRNG/algorithm (details available from above URL) and (2) Use a 32-bit counter. This is a minor modification, which gurantees no bad states (an initial state of all zeroes maps back to an internal state of all zeroes after 256 iterations), and also guarantees a cycle length of at least 2^32. Details on how to implement the counter are available from the above URL. It's a minor modification which has minimal performance impact. Also, a 64-bit version of IBAA is available from the above URL. Matthew Dillon seemed to be interested in that, with regard to the 64-bit x86-64 port of DragonFly (but I haven't heard back from him about that). -- Sincerely, Robin Carey
