Re: "Cipher or key length not supported" under loop-aes 3.0

[Max Vozeler <max@xxxxxxxxxxxx>]

Hi Chris,

On Tue, Jan 31, 2006 at 12:42:37PM -0600, Chris Schadl wrote:
> I've successfully compiled the modules and installed
> the loop-aes-utils package, but when I try to mount the data I
> get the following error:
>
> # mount -o loop,encryption=aes192 /dev/hdb /media/cdrom
> Password:
> ioctl: LOOP_SET_STATUS: Invalid argument, requested cipher or key length (192 bits) not supported by kernel

This suggests that you have the kernel loop module loaded instead
of the loop-AES version. Did you try to unload the loop module in
case the kernel version was already loaded before you installed
loop-AES?  ("rmmod loop; modprobe loop")

What does the output of "lsmod | grep loop" show? 

> The weird thing is that according to /proc/crypto, the maximum AES keysisize
> is 32 bits...

The value should be in bytes, no need to worry ;) /proc/crypto also
lists the in-kernel cryptoapi ciphers, which loop-AES doesn't use.
It provides and uses it's own implementation of the AES cipher.

cheers,
Max

-
Linux-crypto:  cryptography in and on the Linux system
Archive:       http://mail.nl.linux.org/linux-crypto/