Nathan Huckleberry 6b2a51ff03
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 >
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6b2a51ff03