Randomness

All crypto needs good random data.   Linux provides

/dev/random - truely random data
Strong enough for anything
Limited to amount of entropy in system
Blocks until sufficent entropy available.
May want kernel patches to include network entropy for servers.

/dev/urandom - strong pseudorandom data.
Not sufficiently random for key generation
Can be seeded more by writing to /dev/urandom

No need for PRNGd or EGD user-space randomness generators