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#!/bin/sh
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved. This file is offered as-is,
# without any warranty.
ORG="/C=FR/ST=Brittany/L=Vannes/O=IoT.bzh"
cat > extensions << EOC
[root]
basicConstraints=CA:TRUE
keyUsage=keyCertSign
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid
[derivate]
basicConstraints=CA:TRUE
keyUsage=keyCertSign,digitalSignature
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid
EOC
keyof() { echo -n "$1.key.pem"; }
certof() { echo -n "$1.cert.pem"; }
generate() {
local s="$1" n="$2" cn="$3" sig="$4"
local key="$(keyof "$n")" cert="$(certof "$n")"
if [ ! -f "$key" ]
then
echo
echo "generation of the $n key"
openssl genpkey \
-algorithm RSA -pkeyopt rsa_keygen_bits:4096 \
-outform PEM \
-out "$key"
fi
if [ ! -f "$cert" -o "$key" -nt "$cert" ]
then
echo
echo "generation of the $n certificate"
openssl req -new \
-key "$key" \
-subj "$ORG/CN=$cn" |
openssl x509 -req \
-days 3653 \
-sha256 \
-extfile extensions \
-trustout \
$sig \
-set_serial $s \
-setalias "$cn" \
-out "$cert"
fi
}
genroot() {
local s="$1" n="$2" cn="$3"
generate "$s" "$n" "$cn" "-signkey $(keyof "$n") -extensions root"
}
derivate() {
local s="$1" n="$2" cn="$3" i="$4"
generate "$s" "$n" "$cn" "-CA $(certof "$i") -CAkey $(keyof "$i") -extensions derivate"
}
genroot 1 root "Root certificate"
derivate 2 developer "Root developer" root
derivate 3 platform "Root platform" root
derivate 4 partner "Root partner" root
derivate 5 public "Root public" root
rm extensions
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