package chacha

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chacha
- Chacha
- Chacha_core

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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.