Encryption Support for GRUB

[W. Michael Petullo]

I am interested in seeing support for encrypted partitions added to GRUB.
On the GRUB Wiki, encryption support is listed as a suggested project for
Google's Summer of Code 2008. Did anyone pick up this project? If not, I
would like to take a stab at it. Before I start looking closely at this, I
have two questions:

1.  How do I know exactly what subset of libc is available to me as a GRUB
developer? Obviously, system calls would not be expected to work because
the operating system has not yet been loaded, but I would expect libmath
routines to be usable by GRUB. What about other libraries?

2.  Does anyone have any tips on how this could be implemented? I have a
lot of experience working with encrypted root filesystems, but this is my
first shot at an encrypted boot filesystem. I would appreciate comments
from seasoned GRUB developers as I delve into the project's code myself.

Thanks!

Mike