Well thanks for your reply and thanks to tc.hago for his reply but I
think there is something wrong not with useage but now perhaps the
kernel which comes with rhel5 (and earlier according to google). It
doesn't have the kernel modules:

see output of /sbin/lsmod |grep crypto

crypto_blkcipher       17473  1 cbc
crypto_algapi          22721  2 cbc,crypto_blkcipher
crypto_api             12609  3
xfrm_nalgo,crypto_blkcipher,crypto_algapi

Well this is going a little beyond my Knowledge of linux now so
I can't say for sure but aes is not listed in the output. But I
understand that encryption is also listed as a number as well as by name
so .... I just don't know.

Thanks anyway.

Richard.




On Tue, 2011-02-08 at 14:47 -0800, Ray Van Dolson wrote:
> On Tue, Feb 08, 2011 at 10:13:49PM +0000, g wrote:
> > On 02/08/2011 08:48 PM, g1vrg wrote:
> > > Hi, I'm on SL 5.5 and have Luks encrypted partitions. Can anyone tell
> > > me whether the encrytption type is aes and key size please?
> > 
> > never used luks, but i did find this link to have some good info;
> > 
> > https://wiki.archlinux.org/index.php/System_Encryption_with_LUKS_for_dm-crypt
> > 
> > 
> > > On another matter when trying to get losetup (cryptoloop) to work it
> > > returns with the error ioctl: LOOP_SET_STATUS: invalid argument.
> > 
> > as above, but did recheck page and there is at above link;
> > 
> > # 7 Encrypting a loopback filesystem
> >     * 7.1 Preparation and mapping
> >     * 7.2 Encrypt using a key-file
> >     * 7.3 Resizing the loopback filesystem
> > 
> > 
> > which may help, until someone knowledged replies.
> > 
> > 
> > hth.
> > 	
> > -- 
> > 
> > peace out.
> > 
> > tc.hago,
> > 
> > g
> > .
> 
> FYI, the CentOS wiki has a pretty good page on dm-crypt plus LUKS:
> 
>   http://wiki.centos.org/HowTos/EncryptedFilesystem
> 
> Ray