CONFIG_CRYPTO_ARCH_HAVE_LIB_CURVE25519 (not configurable)

configname: CONFIG_CRYPTO_ARCH_HAVE_LIB_CURVE25519

Linux Kernel Configuration
└─>Cryptographic API
└─>CRYPTO_ARCH_HAVE_LIB_CURVE25519
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
Declares whether the architecture provides an arch-specific
accelerated implementation of the Curve25519 library interface,
either builtin or as a module.