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Most of the systems deployed to run such software as you are discussing would probably be dedicated servers. I hate to bring rain to the parade, but when I build a dedicated server, I don't spend the extra money to add a sound card that would just consume extra power. Servers are usually stashed in back rooms or even dedicated air conditioned computer rooms where it's unlikely there'd be anybody nearby to hear them. Thus, I suggest that it is unreasonable to assume a sound card is present. > Date: Thu, 21 Oct 1999 15:03:01 +1000 (EST) > From: "Simon J. Gerraty" <[EMAIL PROTECTED]> > To: [EMAIL PROTECTED] > Cc: [EMAIL PROTECTED] > Subject: Re: RNGs - Use input from your sound card! > Newsgroups: lists.openssl-users > References: <[EMAIL PROTECTED]> ><[EMAIL PROTECTED]> <00e301bf1a5a$16153290$6001010a@CNV079> ><[EMAIL PROTECTED]> <02b001bf1a71$47416d40$6001010a@CNV079> > Sender: [EMAIL PROTECTED] > Precedence: bulk > Reply-To: [EMAIL PROTECTED] > > >> > > OTOH, why people don't just read a pile of bytes from /dev/audio > > Yep this is what I do. I have a host with a sound card located in a busy > office. I grab sound samples from this system at regular intervals. > The script below takes care of the grunt work and may be of use > to others wanting a reasonable source of randomness. Only works > for *nix - sorry. > > --sjg > > [the missing funcs.sh etc are included in > ftp://ftp.quick.com.au/pub/unix/config-sh.cpio.gz] > > : > # NAME: > # getnoise - get some random noise > # > # DESCRIPTION: > # Grab some sound bytes from a machine with a sound card. > # The random? noise from the sound card is compressed and > # appended to a big file. > # > # We then take sequential 1k chunks from the start of the random > # store to update all the .rand files we know of. The idea is > # that it should be difficult to predict when the sound sample > # in any given .rand file was actually collected. > # > # Each 1k chunk of random data is used only once and the random > # storage file is kept from growing too big by stripping of used > # and excess data at the start of the file. The skipping of > # excess data means there is no guarantee that any particular > # sample will be used. > # > # AUTHOR: > # Simon J. Gerraty <[EMAIL PROTECTED]> > > # RCSid: > # $Id: getnoise,v 1.8 1998/11/19 14:00:51 sjg Exp $ > # > # @(#) Copyright (c) 1997 Simon J. Gerraty > # > # This file is provided in the hope that it will > # be of use. There is absolutely NO WARRANTY. > # Permission to copy, redistribute or otherwise > # use this file is hereby granted provided that > # the above copyright notice and this notice are > # left intact. > # > # Please send copies of changes and bug-fixes to: > # [EMAIL PROTECTED] > # > > Myname=getnoise > > # pick up zap() > RC_D=${RC_D:-/etc/rc_d} > . $RC_D/funcs.sh > > source .${Myname}rc $Mydir $RC_D /etc > > case "$NOISE_HOST" in > ""|localhost*|${DEST_HOST:-$HOST}) > RSH="/bin/sh -c";; > *) RSH="${SSHELL:-SSLrsh -zcert=/etc/host.cert} $NOISE_HOST";; > esac > > NOISE_STORE=${NOISE_STORE:-/.random} > TF=${TMP:-/tmp}/gn$$ > > if [ -s $NOISE_STORE ]; then > # grab a reasonable sample > count=${NOISE_SAMPLE:-12} > # Work out how much to skip to keep the file under $NOISE_KEEP > sz=`du $K -s $NOISE_STORE` > sz=`set -- $sz; echo $1` > skip=`expr ${sz:-0} - ${NOISE_KEEP:-120}` > [ $skip -lt 0 ] && skip=0 > else > # grab a bigger sample to start us off. > count=${NOISE_SAMPLE1:-32} > fi > # this works whether /dev/audio is local or not > # we compress first so we know how much data we get... > eval $RSH "'compress < ${DEV_AUDIO:-/dev/audio} | dd bs=1k count=$count'" >> >$NOISE_STORE 2> $TF > egrep -v 'records|bytes' $TF >&2 > > [ -s $NOISE_STORE ] && (locate .rand; locate .rnd) | grep -v $NOISE_STORE | awk '{ >print "test -s", $0, "&& dd bs=1k skip=" NR, "count=1 <", NOISE, ">", $0 } END { >print "mv", NOISE, NOISE ".old && dd bs=1k skip=" NR + SKIP, "<", NOISE ".old >", >NOISE }' NOISE=$NOISE_STORE SKIP=${skip:-0} - | sh > /dev/null 2>&1 > > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List [EMAIL PROTECTED] > Automated List Manager [EMAIL PROTECTED] > > > -- Pacific NorthWest wine, blues, jazz info; http://vintners.net/~mikel Mike Lempriere-Home: [EMAIL PROTECTED] WA State resident-junk email prohibited by law: RCW19.190 & RCW19.86 ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
