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Date: Tue, 31 Jan 2012 16:34:00 +0100
From: Milan Broz <mbroz@redhat.com>
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Subject: Re: [dm-crypt] cryptsetup not accepting plain passwd with -d option
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To: Nikhil AR <nikhilalayil@gmail.com>
Cc: dm-crypt@saout.de

On 01/31/2012 03:49 PM, Nikhil AR wrote:
> Hi,
>
> I have created an encrypted ISO image of a directory named data using the below command.
>
> # mkisofa -r data | aespipe -p3 -e aes256 3<./passphrase > data.iso
...
> Is there a way to provide cryptsetup its password in a file when it is used in this manner?

The problem is with password hashing.

You need recent cryptsetup with loop-aes compatible support
(in your case you do not need new kernel, it is not multi-key device)

Just run
cryptsetup loopaesOpen data.iso aesdev --key-file passphrase

(no losetup needed, it should find loop automatically)

Milan