Trouble with dm-crypt / luks and gpg protected key

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Hi!

I'm trying to protect one of my partitions with luks and a gpg protected
key:
[root@localhost ~]# gpg --quiet
--decrypt /mnt/fedorainitrd/rootfs-key.gpg |cryptsetup -v --key-size=256
--key-file=- --cipher=twofish-cbc-essiv:sha256 luksFormat /dev/sda3
Command successful.   

[root@localhost ~]# gpg --decrypt /mnt/fedorainitrd/rootfs-key.gpg |
cryptsetup -v --key-size=256 --cipher=twofish-cbc-essiv:sha256
luksOpen /dev/sda3 root
gpg: TWOFISH encrypted data
gpg: encrypted with 1 passphrase
gpg: decryption failed: bad key
key slot 0 unlocked.
Command successful.

[root@localhost ~]# ls /dev/mapper/
control  root
[root@localhost ~]# 

As you can see the luksFormat complete successfully (gpg asks for a
passphrase and I enter the right one). But when I'm trying to open the
newly created luks partition, it opens regardless if I enter the correct
or wrong passphrase. What am I missing?

Some system info:
[root@localhost ~]#  cat /etc/redhat-release 
Fedora release 7 (Moonshine)
[root@localhost ~]#  uname -a
Linux localhost.local 2.6.22.4-65.fc7 #1 SMP Tue Aug 21 22:36:56 EDT
2007 i686 i686 i386 GNU/Linux
[root@localhost ~]#  rpm -qa |grep luks
cryptsetup-luks-1.0.5-4.fc7.1
cryptsetup-luks-devel-1.0.5-4.fc7.1
[root@localhost ~]# 

Regards 

/Christoffer






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