ChaCha stream cipher algorithms (x86_64/SSSE3/AVX2/AVX-512VL)

modulename: chacha-x86_64.ko

configname: CONFIG_CRYPTO_CHACHA20_X86_64

Linux Kernel Configuration
└─>Cryptographic API
└─>ChaCha stream cipher algorithms (x86_64/SSSE3/AVX2/AVX-512VL)
In linux kernel since version 3.10 (release Date: 2013-06-30)  
SSSE3, AVX2, and AVX-512VL optimized implementations of the ChaCha20,
XChaCha20, and XChaCha12 stream ciphers.

source code:
arch/x86/crypto/