OpenSSL
From Lolly's Wiki
Verify
# openssl verify -CAfile /srv/www/htdocs/pub/RHN-ORG-TRUSTED-SSL-CERT /etc/pki/spacewalk/jabberd/server.pem
# openssl crl2pkcs7 -nocrl -certfile /srv/www/htdocs/pub/RHN-ORG-TRUSTED-SSL-CERT | openssl pkcs7 -print_certs -noout -print_certs