https://csrc.nist.gov/glossary/term/shake256_256_m
SHAKE256/256(M) - Glossary | CSRC
glossarycsrc
https://lists.gnupg.org/pipermail/gcrypt-devel/2021-April/005138.html
[PATCH 3/3] keccak: add hash_buffers functions for SHAKE128 & SHAKE256
patchkeccakaddhashbuffers
https://docs.rs/rs_shake256/latest/rs_shake256/
rs_shake256 - Rust
SHAKE256 `rs_shake256` - Secure Hash Algorithm KECCAK-based variant
rsrust