X-Recipient:	archive-cygwin AT delorie DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org 915363858283
DKIM-Signature:	v=1; a=rsa-sha256; c=relaxed/relaxed; d=cygwin.com;
	s=default; t=1704725803;
	bh=RRzlbw1ikvL6jAEX1D0v+Ltb7sNwXz2OdpBaqeKif2w=;
	h=Date:To:Subject:References:In-Reply-To:List-Id:List-Unsubscribe:
	List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc:
	From;
	b=l1z6gQ8fLZlMAmUiI4dVDVPcZGYprpV2xS0ovpC1mDv4NqRizFhlMcniMsYLG9mBu
	SEQugKZnscRVx1VTJ52feLhjRPpPmoacsHZUvqndWILeCb42FxMw/HPSWBXudmaiyb
	+a271++5ufKHDAn8BoH7FuVdDZ2/lW95hJCGYw3o=
X-Original-To:	cygwin AT cygwin DOT com
Delivered-To:	cygwin AT cygwin DOT com
DKIM-Filter:	OpenDKIM Filter v2.11.0 sourceware.org CC30538582A6
Date:	Mon, 8 Jan 2024 15:55:35 +0100
To:	cygwin AT cygwin DOT com
Subject:	Re: /dev/u?random implementation
Message-ID:	<ZZwM552P8iaSJJzM@calimero.vinschen.de>
Mail-Followup-To:	cygwin AT cygwin DOT com
References:	<e2f2ea3c-6039-428a-b122-635130dac15a AT jhmg DOT net>
MIME-Version:	1.0
In-Reply-To:	<e2f2ea3c-6039-428a-b122-635130dac15a@jhmg.net>
X-BeenThere:	cygwin AT cygwin DOT com
X-Mailman-Version:	2.1.30
List-Id:	General Cygwin discussions and problem reports <cygwin.cygwin.com>
List-Unsubscribe:	<https://cygwin.com/mailman/options/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=unsubscribe>
List-Archive:	<https://cygwin.com/pipermail/cygwin/>
List-Post:	<mailto:cygwin AT cygwin DOT com>
List-Help:	<mailto:cygwin-request AT cygwin DOT com?subject=help>
List-Subscribe:	<https://cygwin.com/mailman/listinfo/cygwin>,
	<mailto:cygwin-request AT cygwin DOT com?subject=subscribe>
From:	Corinna Vinschen via Cygwin <cygwin AT cygwin DOT com>
Reply-To:	cygwin AT cygwin DOT com
Cc:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
Errors-To:	cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com
Sender:	"Cygwin" <cygwin-bounces+archive-cygwin=delorie DOT com AT cygwin DOT com>

On Dec 20 16:32, Jim Garrison via Cygwin wrote:
> I dug around in the Cygwin doc looking for details on how /dev/random
> and /dev/urandom are implemented, but came up empty.  Is this
> documented anywhere?

Not documented as such, it's a "use the source, luke" kind of
information.

/dev/random is implemted by calling RtlGenRandom().

/dev/urandom is implemted by calling RtlGenRandom() and, if that fails
(which is extremly unlikely) it falls back to a very simple PRNG.


Corinna

-- 
Problem reports:      https://cygwin.com/problems.html
FAQ:                  https://cygwin.com/faq/
Documentation:        https://cygwin.com/docs.html
Unsubscribe info:     https://cygwin.com/ml/#unsubscribe-simple

- Raw text -