full-disclosure - Re: DakaRand

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Date: Mon, 20 Aug 2012 11:29:41 -0500
From: Paul Schmehl <pschmehl_lists@...rr.com>
To: Dan Kaminsky <dan@...para.com>, Paul Schmehl <pschmehl_lists@...rr.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: DakaRand

--On August 20, 2012 8:32:59 AM -0700 Dan Kaminsky <dan@...para.com> wrote:

>
>
>
> On Mon, Aug 20, 2012 at 8:29 AM, Paul Schmehl <pschmehl_lists@...rr.com>
> wrote:
>
>
> --On August 20, 2012 2:22:28 AM -0700 Dan Kaminsky <dan@...para.com>
> wrote:
>
>
> May I ask what FreeBSD's entropy sources are?
>
>
> I'm surprised you don't already know.  From device noise.
>
>
>
>
> Which class?  There are many sorts of said noise (most of which I
> believe actually work).
>

The long answer is look at /usr/src/sys/sys/random.h.

The short answer is:
/* Allow the sysadmin to select the broad category of
 * entropy types to harvest
 */
struct harvest_select {
	int ethernet;
	int point_to_point;
	int interrupt;
	int swi;
};

swi is software interrupt handlers.  interrupt is hardware interrupts (e.g. 
usb, pci, etc.)

*If* you install a hardware PRNG, FreeBSD will use that instead (by 
default).

-- 
Paul Schmehl, Senior Infosec Analyst
As if it wasn't already obvious, my opinions
are my own and not those of my employer.
*******************************************
"It is as useless to argue with those who have
renounced the use of reason as to administer
medication to the dead." Thomas Jefferson
"There are some ideas so wrong that only a very
intelligent person could believe in them." George Orwell

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