Missed something while using cryptsetup

[DeMZed <demzed@gmail.com>]

Hello !

When I do :
cryptsetup -c aes -s 4096 create home /dev/loop0

I get :
Command failed: Bloc de périphérique requis
(Translation : device bloc wanted ... or something like that :-/)

Does this error is because my kernel is not well configured ( something
wrong in device-mapper or dm-crypt or AES ?)

nevertheless
ls -l /dev/mapper/control

give me
crw-rw----  1 root root 10, 63 2005-10-26 21:56 /dev/mapper/control

and
cat /proc/crypto

give me
name         : md5
module       : kernel
type         : digest
blocksize    : 64
digestsize   : 16

name         : aes
module       : aes_i586
type         : cipher
blocksize    : 16
min keysize  : 16
max keysize  : 32
(i've modprobe aes)

who see what i did wrong ??

Thanks for any help !
PS : uname gives Linux 2.6.12-1-k7 #1 Tue Sep 27 13:22:07 JST 2005
i686 GNU/Linux