SMBIOS-provided encryption key patch

[W. Michael Petullo]

I have attached a patch that implements reading an encryption key  
from a SMBIOS record. This is useful for hardware that provides a key  
to a system using SMBIOS when a physical token is attached to a  
system. This patch is dependent on Michael Gorven's encryption patch  
[1].

My system is written to use the SMBIOS BIOS vendor field for testing.  
Presently, this needs to be changed to the appropriate field for a  
given device. Also, there are a lot of grub_printf statements that  
would be removed in a production environment. The patch adds the  
command "dmiloadkey" to GRUB. This command sets the "passphrase"  
environment variable that will then be picked up by Michael's  
encryption functions.

I wanted to make this project available in its current state to  
determine if anyone is interested in it.

[1] http://lists.gnu.org/archive/html/grub-devel/2008-05/msg00127.html

grub-1.96-20080813-dmi.patch
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