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#!/bin/bash
# Set the environment
PRIVATE_KEY_ES256=$1.pem
PUBLIC_KEY_ES256=$2.pem
CLIENT_NAME=DAS
 
# Generates the ES256 keys
openssl ecparam -genkey -name prime256v1 -noout -out "${PRIVATE_KEY_ES256}"
 
# Extracts the public key
openssl ec -in "${PRIVATE_KEY_ES256}" -pubout -out "${PUBLIC_KEY_ES256}"
 
# Generates an x509 certificate 
CERT_KEY_ES256=es256_cert.pem
OPENSSL_CONF=./openssl.cnf
CERT_CN="${CLIENT_NAME} private_key_jwt authentication"
# Build the certificate config file  
printf '[ req ]\n' > "${OPENSSL_CONF}"
printf 'prompt = no\n' >> "${OPENSSL_CONF}"
printf 'distinguished_name = req_distinguished_name\n' >> "${OPENSSL_CONF}"
printf '[ req_distinguished_name ]\n' >> "${OPENSSL_CONF}"
printf 'CN = %s\n' "${CERT_CN}" >> "${OPENSSL_CONF}"
# Creates the x509 certificate 
openssl req -x509 -new -config "${OPENSSL_CONF}" -key "${PRIVATE_KEY_ES256}" -out "${CERT_KEY_ES256}"