Re: [PATCH v2] SP800-38F / RFC3394 key wrapping

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Am Freitag, 1. Mai 2015, 11:20:35 schrieb Herbert Xu:

Hi Herbert,

>On Tue, Apr 28, 2015 at 04:58:31AM +0200, Stephan Mueller wrote:
>> Hm, in case of dm-crypt, that is not really possible, because this is fully
>> driven by user space: libcryptsetup sets up a temporary dm-crypt container
>> for the LUKS header space. Then user space accesses the data it needs and
>> re- injects it into the kernel for the bulk encryption dm-crypt component.
>If both user-space and the kernel implements the same algorithm
>correctly why wouldn't it work?

User space does not use any ciphers to protect the key, that is the 
interesting part. The LUKS header will be mapped by a dm-crypt mapping and 
then read from user space to access the key. So, userspace does not en/decrypt 
the data.

Ciao
Stephan
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