Hello, all. This patch imports strong cryptography and fixes some issues
in authentication system.
1) grub_auth_strcmp and grub_auth_strword are removed. They ended up to
be too complex which is security-issue prone. For password I now
hardcode maximum length as was suggested and use grub_crypto_memcmp.
Logins are now considered non-confidential
2) Ciphers and hashes are imported from libgcrypt. Actual import is
automated and imported files are not included in the patch. To import do:
python import_gcry.py <libgcrypt dir> .
Crypto interface is designed for simplicity and small size
3) PBKDF2-SHA512 password support to increase security. To generate the
encrypted password do:
grub-pbkdf2 [-c iteration_count]
It may not work on non-unix platforms due to terminal control functions
(disabling echo) and /dev/random (retrieving salt). Patches are welcome
PBKDF2 is imported from gnulib
4) xnu_uuid is cleanup to use MD5 from libgcrypt through crypto interface
5) Imported devmapper.mod by Simon Peter. Completely UNTESTED.
Known issues:
No cipher and hash autoloading if it's looked up by the name.
Password and hash modules aren't locked if a cipher/digest is used to
prevent accidental unload.
I send the patch and the same is available in my crypto branch

-- 
Regards
Vladimir 'phcoder' Serbinenko