Better solution.  I was able to upload a wildcard certificate to 8 of our PE R710, R715 and R815 machines.  They are all iDRAC6.

The key is to increase the key length BEFORE you upload the wild card certificate.

Copy SSL Key and CRT (plus intermediate.crt files if necessary) files to Linux host that has access to RACADM utility

concat your.crt and intermediate.crt

cat your.crt intermediate.crt > combo.crt

VI the combi.crt and make sure there is a hard return between the two certificiates.

-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----

Expand the Key Size to allow for modern SSL Certificates

racadm -r 192.168.rac.addr -u root -p yourPass config -g cfgRacSecurity -o cfgRacSecCsrKeySize 2048

Upload the your Private Key

racadm -r 192.168.rac.addr -u root -p yourPass sslkeyupload -t 1 -f your.key

Upload the Combo Certificate

racadm -r 192.168.rac.addr -u root -p yourPass sslcertupload -t 1 -f combo.crt

this will cause a iDRAC reboot.  it will take about 5 minutes to complete

Once done.. *.example.net certificate will work

Jim