CONFIG_CRYPTO_CHACHA_RISCV64 is not available for thedefaultarchitecture x86.
Result is shown for architecture riscv or 64BIT

CONFIG_CRYPTO_CHACHA_RISCV64 (not configurable)

modulename: chacha-riscv64.ko

configname: CONFIG_CRYPTO_CHACHA_RISCV64

Linux Kernel Configuration
└─>CRYPTO_CHACHA_RISCV64
In linux kernel since version 4.19.314 (release Date: 2024-05-17)  
source code:
/arch/riscv/lib/crypto/