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Re: $RANDOM not Cryptographically secure pseudorandom number generator


From: Eduardo A . Bustamante López
Subject: Re: $RANDOM not Cryptographically secure pseudorandom number generator
Date: Mon, 7 Jan 2019 00:36:47 -0800
User-agent: Mutt/1.10.1 (2018-07-13)

On Mon, Jan 07, 2019 at 08:15:12AM +0100, Ole Tange wrote:
> On Mon, Jan 7, 2019 at 12:08 AM Chet Ramey <address@hidden> 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?



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