chacha

The Chacha functions, in OCaml
README


ChaCha family of encryption functions, in OCaml

An OCaml implementation of ChaCha functions,
both ChaCha20 and the reduced ChaCha8 and ChaCha12 functions.
The hot loop is implemented in C for efficiency reasons.

Installation

opam install chacha

Usage

utop[0]> #require "mirage-crypto";;
utop[1]> #require "mirage-crypto-rng.unix";;
utop[2]> Mirage_crypto_rng_unix.initialize ();;
- : unit = ()
utop[3]> let key = Mirage_crypto_rng.generate 32;;
val key : Cstruct.t = {Cstruct.buffer = <abstr>; off = 0; len = 32}
utop[4]> let nonce = Cstruct.create 8;;
val nonce : Cstruct.t = {Cstruct.buffer = <abstr>; off = 0; len = 8}
utop[5]> #require "chacha";;
utop[6]> let state = Chacha.create key nonce;;
val state : Chacha.t = <abstr>
utop[7]> Chacha.encrypt (Cstruct.of_string "My secret text") state |> Cstruct.to_string;;
- : string = "\026m.\\363\\026\\263\\207Xg\\256l\\262\\232F"
  • Key can either 32 (recommended) or 16 bytes

  • Chacha state may use a different hashing function,
    the recommended Chacha_core.chacha20 is used by default.

Install
Sources
1.1.0.tar.gz
md5=0c9cf7e83222b5feacc56edf657dfbd7
sha512=4a0cdf8649c6f03ee24534ec870d51920dfc37f5b64a6fd393114b810361eab27b2172b52d408275add3d2ca11808f0d85124594ff972fb2e73ba50c0bc0869c
Dependencies
alcotest
with-test
ocaml
>= "4.02.0"
cstruct
>= "6.0.0" & < "6.1.0"
dune
>= "1.8.0"
Reverse Dependencies