#!/bin/sh
#################################################################
#
#	@(#) create-dkim-key (c) Aug 2006 H.Zuleger  hznet.de
#
#################################################################
PATH=/bin:/usr/bin

if test $# != 1
then
	echo "usage: $0 selector" 1>&2
	exit 1
fi

bits=1024
selector=$1

echo "generating rsa key of $bits bits"
openssl genrsa -out $selector.pem $bits
echo "public rsa key for dkim-filter usage stored in file \"$selector.pem\""

echo "extracting public domain key"
pubkey=`openssl rsa -in $selector.pem -pubout |
	sed '/^---/d' |
	tr -d "\012"`

echo -e "$selector\tIN  TXT \"v=DKIM1; k=rsa; t=y; s=email; p=$pubkey\"" > $selector.txt
echo "DNS RR for _domainkey domain stored in file \"$selector.txt\""