generating tls certificates for radius under centos

Hi all, i need to generate certificate files for radius tls. I am using CentOS 5.1 and scripts in /etc/pki/tls/misc for generated own CA key, and for own keys signed with my CA. For Radius i need a server certificate with xpextensions support. How can i generate server certificate with xpextensions which will be signed with my own CA on CentOS5.1? Thanks in advance! David