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
Published
31 Mar 2020
Sources
chacha-1.0.0.tbz
sha256=b7c74e310403a637b441bb8e8634886b7c675ee5dcc4c5532c435afebc1d800e
sha512=8970b66083f28ddbb5da65c0b59323a9821b790dbaecd49f4a2a2f18025a674e3493292699626b13e414c4d09fdad3a2f25783a3ca0c15ab9b678a69485858eb
Dependencies
alcotest
with-test
ocaml
>= "4.02.0"
cstruct
>= "3.2.0" & < "6.1.0"
dune
>= "1.8.0"
Reverse Dependencies