Re: $RANDOM not Cryptographically secure pseudorandom number generator

[Eduardo A . Bustamante López]

On Mon, Jan 07, 2019 at 08:15:12AM +0100, Ole Tange wrote:
> On Mon, Jan 7, 2019 at 12:08 AM Chet Ramey <chet.ramey@case.edu> wrote:
> >
> > On 1/5/19 3:12 PM, Eduardo A. Bustamante López wrote:
> > > On Fri, Dec 28, 2018 at 10:24:50AM +0100, Ole Tange wrote:
> > > (...)
> > >> Patch attached.
> :
> > > - Does the new RNG generate uniformly distributed numbers? (Yes)
> > > - What is the performance impact (roughly 2X slower)
> 
> The impact is not from Salsa20/ChaCha20, though, if you compare
> patched vs. unpatched code.
> 
> On my system BASH_RANDOM_16 is a tiny bit faster than the original,
> while BASH_RANDOM_32 is a tiny bit slower.

I find that really hard to believe. The new RNG is clearly doing more work, so
it should be slower. And that's OK. I just wanted to know by how much.

What numbers are you seeing and how did you measure them?