CONFIG_CRYPTO_SHA512_RISCV64 is not available for thedefaultarchitecture x86.
Result is shown for architecture 64BIT or riscv

Hash functions: SHA-384 and SHA-512

modulename: sha512-riscv64.ko

configname: CONFIG_CRYPTO_SHA512_RISCV64

Linux Kernel Configuration
└─>Accelerated Cryptographic Algorithms for CPU (riscv)
└─>Hash functions: SHA-384 and SHA-512
In linux kernel since version 6.1.89 (release Date: 2024-04-29)  
SHA-384 and SHA-512 secure hash algorithm (FIPS 180)

Architecture: riscv64 using:
- Zvknhb vector crypto extension
- Zvkb vector crypto extension

source code:
/arch/riscv/crypto/