default or selected kernelversion does not have config value CONFIG_CRYPTO_GF128MUL.
Result is shown for kernelversion 6.9.9

GF(2^128) multiplication functions

modulename: gf128mul.ko

configname: CONFIG_CRYPTO_GF128MUL

Linux Kernel Configuration
└─>Cryptographic API
└─>GF(2^128) multiplication functions
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Efficient table driven implementation of multiplications in the
field GF(2^128). This is needed by some cypher modes. This
option will be selected automatically if you select such a
cipher mode. Only select this option by hand if you expect to load
an external module that requires these functions.

source code: