From: Stephan Mueller <smueller@chronox.de>
Subject: Re: [PATCH v5 0/7] /dev/random - a new approach
Date: Tue, 21 Jun 2016 09:32:13 +0200
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Cc: Theodore Ts'o <tytso@mit.edu>, Pavel Machek <pavel@ucw.cz>,
	Herbert Xu <herbert@gondor.apana.org.au>,
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To: Nikos Mavrogiannopoulos <nmav@gnutls.org>
In-Reply-To: <CAJU7zaJFCty9CQZwzY3_N2Rx91mh-FhJd8Us+akHpTzCc5CjZw@mail.gmail.com>
Sender: linux-crypto-owner@vger.kernel.org

Am Dienstag, 21. Juni 2016, 09:12:07 schrieb Nikos Mavrogiannopoulos:

Hi Nikos,

> On Mon, Jun 20, 2016 at 5:43 PM, Stephan Mueller <smueller@chronox.de> 
wrote:
> >> Personally, I don't really use /dev/random, nor would I recommend it
> >> for most application programmers.  At this point, getrandom(2) really
> >> is the preferred interface unless you have some very specialized
> >> needs.
> > 
> > I fully agree. But there are use cases for /dev/random, notably as a seed
> > source for other DRNG.
> 
> Is that really the case? I believe all DRNG's use /dev/urandom anyway
> for seeding since they cannot afford indeterminate blocking. It would
> be a gain for everyone if /dev/random was the same as /dev/urandom in
> Linux.

For standard approaches, this is true. But there are regulations, notably in 
the German realm, /dev/random shall be used, at least partially (see AIS 
20/31).

Ciao
Stephan