mount dm-crypt encrypted partition

[Ramrod]

Hi,

maybe someone is able to clarify the following for me:

If I encrypt a partition like

./cryptsetup -c aes -y create my-data /dev/sda1
mke2fs -j /dev/mapper/my-data
mount /dev/mapper/my-data /data

is there a way to mount it after reboot, which asks me for the password?
If know that cryptsetup only creates a mapping and you call cryptsetup again after a reboot and supply the same passphrase you will be able to mount your filesystem you created before. The problem here is that if you specify a different password than when you first created it, cryptsetup doesn't complain, but creates a new mapping. So I can't use this method in an init script after boot, because a typo in the password would mean it wouldn't be mounted.
Someone have a solution? I want to encrypt /home and would like to be asked for the password when booting. If I misstype it I should be asked for it again.

[fangorn]

I'm using a file instead of a partition, but the cryprsetup command should be the same

[Ramrod]

I saw that if you use a wrong password, mount fails. So for now I just wrote a little script which asks for the password and then checks if the mappd device was mounted ok and if not than I just repeat it until it works. Not nice but works.