[ req ]
default_bits = 3072
distinguished_name = req_distinguished_name
prompt = no
x509_extensions = myexts

[ req_distinguished_name ]
O = CentOS
CN = CentOS Linux kernel signing key 
emailAddress = security@centos.org 

[ myexts ]
basicConstraints=critical,CA:FALSE
keyUsage=digitalSignature
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid