ChaCha20 stream cipher

modulename: chacha_s390.ko

configname: CONFIG_CRYPTO_CHACHA_S390

Linux Kernel Configuration
└─>Cryptographic API
└─>Hardware crypto devices
└─>ChaCha20 stream cipher
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
This is the s390 SIMD implementation of the ChaCha20 stream
cipher (RFC 7539).

It is available as of z13.

source code:
arch/s390/crypto/