Init (for import/kernel-5.3)

.gitignore

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+x509*.genkey
+*.pem
+*.tar
+sha*.list
+md*.list
+

key.sh

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+#!/bin/sh
+# Usage: EMAIL=vasya@pupkin.ru NUM=1 sh key.sh
+set -efu
+
+cat << EOF > "x509_${NUM}.genkey"
+[ req ]
+prompt = no
+default_bits = 4096
+default_md = sha512
+days = 109500
+default_keyfile = full_key${NUM}.pem
+distinguished_name = req_distinguished_name
+[ req_distinguished_name ]
+organizationName = ROSA Linux
+commonName = Additional private kernel modules signing key #${NUM}
+emailAddress = ${EMAIL}
+EOF
+
+openssl req -new -nodes -utf8 -batch -x509 \
+	-config "x509_${NUM}.genkey" \
+	-outform PEM \
+	-out "full_key${NUM}.pem" \
+	-keyout "full_key${NUM}.pem" 
+
+sed -n '/^-----BEGIN CERTIFICATE-----$/,/^-----END CERTIFICATE-----$/p;/^-----END CERTIFICATE-----$/q' "full_key${NUM}.pem" > "public${NUM}.pem"