openssl.cnf

[ req ]
default_bits = 4096
distinguished_name = req_distinguished_name
prompt = no
string_mask = utf8only
x509_extensions = myexts

[ req_distinguished_name ]
O = MelvinCorp
CN = MelvinModules
emailAddress = foo@example.com

[ myexts ]
basicConstraints=critical,CA:FALSE
keyUsage=digitalSignature,nonRepudiation,keyEncipherment,keyAgreement
extendedKeyUsage=critical,codeSigning
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid