[RFC PATCH v4 0/2] generic: test HCTR2 filename encryption

[Nathan Huckleberry <nhuck@google.com>]

This patchset is not intended to be accepted yet.  It is reliant on HCTR2
support in the kernel which has not yet been accepted.  See the HCTR2 patchset
here: https://lore.kernel.org/all/20220520181501.2159644-1-nhuck@google.com/

HCTR2 is a new wide-block encryption mode that can used for filename encryption
in fscrypt.  This patchset adds a reference implementation of HCTR2 to the
fscrypt testing utility and adds tests for filename encryption with HCTR2.

More information on HCTR2 can be found here: "Length-preserving encryption with
HCTR2": https://ia.cr/2021/1441

Changes in v4:
* Add helper functions for HCTR2 hashing
* Fix accumulator alignment bug
* Small style fixes

Changes in v3:
* Consolidate tests into one file

Changes in v2:
* Use POLYVAL multiplication directly instead of using GHASH trick
* Split reference implementation and tests into two patches
* Remove v1 policy tests
* Various small style fixes

Nathan Huckleberry (2):
  fscrypt-crypt-util: add HCTR2 implementation
  generic: add tests for fscrypt policies with HCTR2

 common/encrypt           |   2 +
 src/fscrypt-crypt-util.c | 341 ++++++++++++++++++++++++++++++++-------
 tests/generic/900        |  28 ++++
 tests/generic/900.out    |  16 ++
 4 files changed, 330 insertions(+), 57 deletions(-)
 create mode 100755 tests/generic/900
 create mode 100644 tests/generic/900.out

-- 
2.36.1.255.ge46751e96f-goog