1995-09-22 - Re: /dev/random for Linux

Header Data

From: Theodore Ts’o <tytso@MIT.EDU>
To: perry@piermont.com
Message Hash: 6d4a12fa4ff02af034deed7502a68fe01818332a4405a623a10ca033733dae5d
Message ID: <9509222039.AA25206@dcl.MIT.EDU>
Reply To: <199509210349.XAA06110@frankenstein.piermont.com>
UTC Datetime: 1995-09-22 20:40:17 UTC
Raw Date: Fri, 22 Sep 95 13:40:17 PDT

Raw message

From: Theodore Ts'o <tytso@MIT.EDU>
Date: Fri, 22 Sep 95 13:40:17 PDT
To: perry@piermont.com
Subject: Re: /dev/random for Linux
In-Reply-To: <199509210349.XAA06110@frankenstein.piermont.com>
Message-ID: <9509222039.AA25206@dcl.MIT.EDU>
MIME-Version: 1.0
Content-Type: text/plain


   > > On this same track, I suggest that "/dev/random" devices for unix are
   > > an excellent idea. Ted Tso did one for Linux that steals all the bits
   > > of semi-random timing information it can.
   >
   > Anyone know where I can find more information on this wonderful device?

I've just sent patches (versus the Linux 1.3.28 kernel) off to Linus.
There's a fairly long exposition at the beginning of
drivers/char/random.c which explain its theory of operation.

There are some things that I had wanted to do to make it better; for
example, not use MD5 in the inner bucket-mixing, but use a CRC-based
mixing algorithm that Colin had suggested; this should be much faster,
and since I'm using MD5 on the output side of the random number
generator, it should be good enough.  Also, at some point I want to add
code so that it can sample the Pentium instruction cycle clock register,
which will give us a much finer granularity clock with which to measure
events.

However, given the current interest in random number generators ---
thank you Netscape for providing such a wonderful object lession!  :-) ---
and keeping in mind the saying that the best is often the enemy of the
good, I've decided to make what I have available now, and worry about
improving it later.

In any case, here it is.  With any luck, it'll be included in the 1.3.29
Linux kernel; the idea is that application programs running under Linux
should be able to assume that /dev/random exists and that they can rely
on it.  Perhaps if enough free OS's do this, commercial OS vendors will
get shamed into providing /dev/random on their Unix systems.  Or better
yet, perhaps hardware vendors will decide it's worth including the $10
(if that) worth of parts necessary to have a real, hardware-based random
number generator in their machines.

If there are any representatives from such computer manufacturers,
please consider this a hint.  :-)

						- Ted

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end





Thread