aes256 keys not supported

[<cyrus@univ-paris4.fr>]

Hello,

I try to create the master key with aes256-cts-hmac-sha1-96 but i get this :

# kstash -e aes256-cts-hmac-sha1-96  --random-key
kstash: writing key to `/var/heimdal/m-key'
# kadmin -l
kadmin: kadm5_init_with_password: encryption type 18 not supported

default_enctypes =  aes256-cts-hmac-sha1-96 in [libdefaults] 

OS : FreeBSD 6.1
heimdal-1.0.1

What's the problem ? How i can i enable aes256-cts-hmac-sha1-96 encryption type
?

Regards.