a122e02623
The previous PBKDF2 implementation used grub_crypto_hmac_buffer() which allocates and frees an HMAC handle on every call. This approach caused significant performance overhead slowing down the boot process considerably. This commit refactors the PBKDF2 code to use the new HMAC functions allowing the HMAC handle and its buffers to be allocated once and reused across multiple operations. This change significantly reduces disk unlocking time. In a QEMU/OVMF test environment this patch reduced the time to unlock a LUKS2 (*) partition from approximately 15 seconds to 4 seconds. (*) PBKDF2 SHA256 with 3454944 iterations. Signed-off-by: Gary Lin <glin@suse.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'