Add support for AES-XTS cipher mode in addition to the existing
AES-CBC-ESSIV support. This is the default cipher for LUKS2 volumes.
The cipher mode (CBC/XTS) is obtained from the LUKS1 cipher_mode or
LUKS2 encryption metadata.
XTS mode uses 512-byte block numbers for IV generation (plain64),
matching dm-crypt behavior. LUKS2 typically uses 4096-byte sectors
for XTS encryption but the IV is based on 512-byte block numbers.
Fix the blkmap-size calculation to exclude the LUKS header/payload
offset.
Update the LUKSv2 test to check reading a file.
Series-to: concept
Cover-letter:
luks: Support the AES-XTS cipher mode
This series finishes off the implementation of LUKSv2, adding support
for the common cipher mode and testing that files can be read from the
disk.
It includes a fix for using the correct size when mapping the crypt, as
well as some refactoring to split up the code a little better.
END
Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <simon.glass@canonical.com>
a2b25780a4