HCTR2

modulename: hctr2.ko

configname: CONFIG_CRYPTO_HCTR2

Linux Kernel Configuration
└─>Cryptographic API
└─>Length-preserving ciphers and modes
└─>HCTR2
In linux kernel since version 6 (release Date: 2022-10-02)  
HCTR2 length-preserving encryption mode

A mode for storage encryption that is efficient on processors with
instructions to accelerate AES and carryless multiplication, e.g.
x86 processors with AES-NI and CLMUL, and ARM processors with the
ARMv8 crypto extensions.

See https://eprint.iacr.org/2021/1441

source code: