env/utils/gen-ec-cert.sh

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#!/bin/sh
usage()
{
printf "Usage: %s [-c curve] [-d days] domain\n" "${0##*/}" >&2
exit 1
}
tonumber()
{
printf "%u\n" "$*"
}
curve=secp384r1
days=3650
while getopts c:d: flag; do
case $flag in
c) [ -n "$OPTARG" ] || usage
curve=$OPTARG
;;
d) days=$(tonumber "$OPTARG") || usage
;;
*) usage
;;
esac
done
shift $((OPTIND - 1))
[ $# -eq 1 ] && [ -n "$1" ] || usage
domain=$1
if [ -f "$domain.key" ]; then
printf "%s: key for %s already exists; reusing it.\n" \
"${0##*/}" "$domain" >&2
else
(umask 077 && openssl genpkey -aes256 \
-algorithm ec -pkeyopt ec_paramgen_curve:"$curve" \
-out "$domain.key")
if [ $? -ne 0 ] || [ ! -s "$domain.key" ]; then
# openssl doesn't return an error code if there is a password
# mismatch or a password too short, and it creates the output
# file anyways
rm -f "$domain.key"
exit 1
fi
fi
openssl req -new -x509 -days "$days" -subj "/CN=$domain" \
-key "$domain.key" -out "$domain.pem"