here are the detail of a simple demonstration of the corruption. i really
hope i'm doing something wrong so i can simply fix it.
- brett
---------- Forwarded message ----------
Date: Sun, 25 Nov 2001 17:00:12 -0800 (PST)
From: beldridg@best.com
To: linux-crypto@nl.linux.org
Cc: beldridg@best.com
Subject: demonstration of the file corruption problem
i sent an earlier message, but i'm not sure if it got through. here are
more details.
i'm running 2.4.16pre1 with the latest cryptoapi patch and
CONFIG_CRYPTOLOO_512IV=y.
the script below clearly demonstrates the file corruption problems:
1. [root@rush beldridg]# losetup -e blowfish /dev/loop0 .inbox
Available keysizes (bits): 128 160 192 256
Keysize: 128
Password:
2. [root@rush beldridg]# mke2fs /dev/loop0
mke2fs 1.23, 15-Aug-2001 for EXT2 FS 0.5b, 95/08/09
run again just to make sure:
[root@rush beldridg]# mke2fs /dev/loop0
mke2fs 1.23, 15-Aug-2001 for EXT2 FS 0.5b, 95/08/09
3. [root@rush beldridg]# losetup -d /dev/loop0
4. [root@rush beldridg]# mount -o loop,encryption=blowfish .inbox
mail/testing
Available keysizes (bits): 128 160 192 256
Keysize: 128
Password:
5. copy a random file (note the first two fail because they try using
reserved inodes):
[root@rush beldridg]# cp /tmp/install.log mail/testing/
cp: cannot create regular file `mail/testing/install.log': Input/output
error
[root@rush beldridg]# cp /tmp/install.log mail/testing/
cp: cannot create regular file `mail/testing/install.log': Input/output
error
then this one works:
[root@rush beldridg]# cp /tmp/install.log mail/testing/
6. [root@rush beldridg]# md5sum mail/testing/install.log
8173590ad0ecaa4bb3f20c574176466e mail/testing/install.log
7. [root@rush beldridg]# sync
[root@rush beldridg]# umount mail/testing
[root@rush beldridg]# mount -o loop,encryption=blowfish .inbox
mail/testing
Available keysizes (bits): 128 160 192 256
Keysize: 128
Password:
8. [root@rush beldridg]# md5sum mail/testing/install.log
402c6bb5db8a720b762b19dcfdc2c4ce mail/testing/install.log
Note the two different md5sum values.
thanks,
- brett "praying and hoping for a stable 2.4.x kernel with
crypto at some point"
-
Linux-crypto: cryptography in and on the Linux system
Archive: http://mail.nl.linux.org/linux-crypto/
