abeaumont / ocaml-salsa20-core

Salsa20 core functions, in OCaml

The Salsa20 core functions, in OCaml

An OCaml implementation of Salsa20 Core functions, both Salsa20/20 Core and the reduced Salsa20/8 Core and Salsa20/12 Core functions. The hot loop is implemented in C for efficiency reasons.

Salsa 20 Core are functions from 64-byte strings to 64-byte strings.

Installation

opam install salsa20-core

Usage

utop[0]> #require "salsa20-core";;
utop[1]> 0
|> Char.chr
|> String.make 64
|> Cstruct.of_string
|> Salsa20_core.salsa20_20_core (* or salsa20_12_core / salsa20_8_core *)
|> Cstruct.to_string;;
- : string =
"\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000"

ocaml-salsa20-core's Issues

Implement ChaCha20

Hello!

Would you consider adding support for ChaCha20 as well?

It seems like most new protocols choose ChaCha20 over Salsa20, as recommended by Bernstein in the ChaCha20 paper. I specifically need it for my WireGuard implementation.

It's my impression that it's a relatively small modification to Salsa20, so I thought it would be a reasonable place to have the code rather than fork the repo and replace it with ChaCha20.

performance

did you measure performance of this implementation? was OCaml in the end smart enough to inline the functions in the hot loop? would be nice to have some mentions of the performance characteristics in the README