RISC-V Vector Implementation of Keccak hash function.

This repository contains multiple experiments of vectorized implementation of the Keccak function (Keccak-F1600). In particular it contains unrolled scalar C implementations and implementations using RISC-V Vector Extensions.

The implementations are based on C the implementation from https://github.com/XKCP/XKCP/tree/master/Standalone/CompactFIPS202/C.

A blog post described some of the techniques evaluated and summarized the results: https://fprox.substack.com/publish/posts/detail/140028226?referrer=github.

An environment to build the source contained in this repository can be created using the DockerFile riscv-toolchain.Dockerfile.

docker build  -t riscv:riscv-toolchain -f riscv-toolchain.Dockerfile .

docker run  -ti --mount type=bind,source="$(pwd)"/,target=/home/app/ riscv:riscv-toolchain

This repository contains multiple implementations of the Keccak function.

• Baseline very compact implementation in Keccak-more-compact.c
• Optimized (unrolled) compact implementation in Keccak-more-compact-opt.c
• Optimized (unrolled with less memory accesses) compact implementation in Keccak-more-compact-opt-in-regs.c
• Baseline readable implementation in Keccak-readable-and-compact.c
• RVV based implementation in keccak-vector-wrapper.c (actual implementation is in keccak-vector.c)

Those implementations can be selected by setting the KECCAK_SRC and KECCAK_WRAPPER_SRC variables to the corresponding source file when building and running the benchmark. For example:

make sim_bench_keccak KECCAK_SRC=keccak-vector.c KECCAK_WRAPPER_SRC=keccak-vector-wrapper.c CFLAGS="-O3"