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List:       etux
Subject:    Re: Initializing /dev/random for sshd
From:       Wolfgang Denk <wd () denx ! de>
Date:       2005-04-04 18:59:06
Message-ID: 20050404185911.3AAA7C108D () atlas ! denx ! de
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In message <42517050.7000600@symboticware.com> you wrote:
> 
> I'm attempting to configure OpenSSH on an embedded Linux system and I'm 
> wondering if there are standard approaches to initialize /dev/random for 
> embedded systems.

There are: in simple cases use /dev/urandom instead ("rm -f random  ;
ln  -s  urandom  random").  Or  add  code to your drivers to feed the
entropy; for example, this  simple  change  (in  the  cs89xx  network
driver)  uses  the  network inter-interrupt times to feed the entropy
for /dev/random - this should be easy  to  adapt  to  other  suitable
drivers in your system:

-       if (request_irq(dev->irq, net_interrupt, SA_SHIRQ, "cs8900a", dev)) {
+       if (request_irq(dev->irq, net_interrupt, SA_SHIRQ | SA_SAMPLE_RANDOM, "cs8900a", dev)) {


Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
Computers are not intelligent.  They only think they are.

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