CONFIG_CRYPTO_CURVE25519_X86 is not available for the selected architecture x86.
Result is shown for architecture x86 or 64BIT

x86_64 accelerated Curve25519 scalar multiplication library

modulename: curve25519-x86_64.ko

configname: CONFIG_CRYPTO_CURVE25519_X86

Linux Kernel Configuration
└─>Cryptographic API
└─>x86_64 accelerated Curve25519 scalar multiplication library
In linux kernel since version 4.14.326 (release Date: 2023-09-23)
source code:
arch/x86/crypto/curve25519-x86_64.c


is depended by
CONFIG_WIREGUARD