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| author |   Nathan Huckleberry <nhuck@google.com> | 2022-05-20 18:15:01 +0000 |
|---|---|---|
| committer |   Herbert Xu <herbert@gondor.apana.org.au> | 2022-06-10 16:40:18 +0800 |
| commit | 6b2a51ff03bf0c54cbc699ee85a9a49eb203ebfc (patch) | |
| tree | 8110bcd6c9baaedb35a031ae2529b2e47fa74269 /lib/mpi/mpi-add.c | |
| parent | crypto: arm64/polyval - Add PMULL accelerated implementation of POLYVAL (diff) | |
| download | linux-dev-6b2a51ff03bf0c54cbc699ee85a9a49eb203ebfc.tar.xz linux-dev-6b2a51ff03bf0c54cbc699ee85a9a49eb203ebfc.zip | |
fscrypt: Add HCTR2 support for filename encryption
HCTR2 is a tweakable, length-preserving encryption mode that is intended
for use on CPUs with dedicated crypto instructions. HCTR2 has the
property that a bitflip in the plaintext changes the entire ciphertext.
This property fixes a known weakness with filename encryption: when two
filenames in the same directory share a prefix of >= 16 bytes, with
AES-CTS-CBC their encrypted filenames share a common substring, leaking
information. HCTR2 does not have this problem.
More information on HCTR2 can be found here: "Length-preserving
encryption with HCTR2": https://eprint.iacr.org/2021/1441.pdf
Signed-off-by: Nathan Huckleberry <nhuck@google.com>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Acked-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'lib/mpi/mpi-add.c')
0 files changed, 0 insertions, 0 deletions