LinuxQuestions.org
Download your favorite Linux distribution at LQ ISO.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Software
User Name
Password
Linux - Software This forum is for Software issues.
Having a problem installing a new program? Want to know which application is best for the job? Post your question in this forum.

Notices


Reply
  Search this Thread
Old 07-02-2004, 05:30 PM   #1
PrimusXPrimus
LQ Newbie
 
Registered: Apr 2004
Posts: 5

Rep: Reputation: 0
loop-AES dm-crypt and Gentoo


I made encrypted a pair of disks using loop-AES on Debian Woody. I recently formatted my system disk to Gentoo. I saved the encryption keys for the other disk. The problem is, the script I had written called for this:

losetup -e aes -k 128 -p 0 /dev/loop0 /dev/hde > /keyfile

In other words, create a loopback device based on this hard disk and unencrypt it using the AES cipher and the contents of "keyfile" which is a 128 bit key.

So what I did was download the freshest util-linux and aes-loop. I patched util-linux and compiled with no problem and I was able to make and install loop.ko with no problem as well. I compiled my kernel without loopback support, and loaded loop.ko using

modprobe loop

modprobe -l verifies that it is loaded.

So far so good. The problem is that this version of losetup no longer takes the -k option and I can't remember what version I was using before. I also can't remember if I used patched util-linux or Crypto-API. Okay, so i changed "aes" to "aes-128". Now I enter the command:

losetup -e aes-128 -p 0 /dev/loop0 /dev/hde > /keyfile

I get no errors, but when I try to mount loop0 I get told that it can't find a filesystem on the device. Shit. Is this a problem with the "offset"? Why have the parameters of this program changed? I'm not sure what's going on here.
 
Old 10-12-2004, 05:18 PM   #2
robert.piro
LQ Newbie
 
Registered: Oct 2004
Distribution: gentoo 2004.2
Posts: 1

Rep: Reputation: 0
I am facing the same problems:
I migrated my machine from RH9 to Gentoo 2004.2 (2.6.7-gentoo-r11) and tried to mount aes encrypted files as ext2 filesystems.
All I get is

# mount -text2 aes256.dsk disk/ -oencryption=aes-256,loop
Password:
mount: wrong fs type, bad option, bad superblock on /dev/loop0,
or too many mounted file systems
(could this be the IDE device where you in fact use
ide-scsi so that sr0 or sda or so is needed?)

At the moment I have compiled cryptoloop support and aes cipher as modules (but I also tried them as kernel built-ins, since I did not know what else to try)
# lsmod
Module Size Used by
cryptoloop 2788 -
aes 31648 -
loop 12332 -
ipv6 224608 -
nvidia 4817140 -


I have also downloaded util-linux-2.12.tar.gz, patched and installed it and I have tested out loopAES as described in loopAES-README . Unfortunately my password was not long enough for loopAES (at least 20 chars); I did not use loopAES in RH9 anyway, though.

What did I miss, what can I do? Do you have already a solution, PrimusXPrimus (except reinstalling RH9 and hoping to find the right patch)?
 
  


Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off



Similar Threads
Thread Thread Starter Forum Replies Last Post
Loop-aes vs DM-crypt Frogular Linux - Security 3 12-26-2007 03:13 PM
loop aes digi691 Linux - Security 6 05-27-2005 09:11 PM
kernel 2.6.8mdk with AES wingcom Linux - Software 0 01-17-2005 05:50 AM
loop-aes movery Linux - Security 0 01-14-2005 08:29 AM
Gentoo. Problems with the loop device when mounting an iso file Snerkel Linux - Software 4 11-26-2004 03:34 PM

LinuxQuestions.org > Forums > Linux Forums > Linux - Software

All times are GMT -5. The time now is 01:12 AM.

Main Menu
Advertisement
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
Open Source Consulting | Domain Registration