Module `Chacha`

ChaCha, a variant of Salsa20 specifies a ChaCha20 encryption function as well as a set of reduced Chacha8 and Chacha12 encryption functions.

type t: Type of ChaCha state.

val create : ?⁠hash:(Cstruct.t -> Cstruct.t) -> Cstruct.t -> Cstruct.t -> t

create key nonce is state, the ChaCha20 encryption/decryption function state. hash is Chacha_core.chacha20_core by default (recommended), Chacha_core.chacha12 or Chacha_core.chacha8 could also be used instead. key is either a 32 (recommended) or 16 bytes. nonce is 8 bytes.

raises Invalid_argument: if key or nonce is not of the correct size

val encrypt : Cstruct.t -> t -> Cstruct.t: encrypt input state is output, the ChaCha encryption function.

val decrypt : Cstruct.t -> t -> Cstruct.t: encrypt input state is output, the ChaCha decryption function.