full-disclosure - Re: how i stopped worrying and loved the backdoor

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Date: Fri, 24 Dec 2010 19:24:44 -0600
From: Marsh Ray <marsh@...endedsubset.com>
To: Dan Kaminsky <dan@...para.com>
Cc: full-disclosure@...ts.grok.org.uk
Subject: Re: how i stopped worrying and loved the backdoor

On 12/24/2010 07:08 PM, Dan Kaminsky wrote:
>
> Don't we have hardware RNG in most motherboard chipsets nowadays?
>
> (Not that you should exclusively trust it, but the nature of RNG's is
> that it's easy to mix in sources.)

Haha, you're going to love this:

> http://code.bsd64.org/cvsweb/openbsd/src/sys/dev/rnd.c?rev=1.106;content-type=text%2Fplain
>
> 	switch(minor(dev)) {
> 		case RND_RND:
> 			ret = EIO;	/* no chip -- error */
> 			break;
> 		case RND_SRND:
> 		case RND_URND:
> 		case RND_ARND_OLD:
> 		case RND_ARND:
> 			arc4random_buf(buf, n);
> 			break;
> 		default:
> 			ret = ENXIO;
> 		}

- Marsh

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