`object
method block_constraint : int
method decrypt :
last:bool -> Netsys_types.memory -> Netsys_types.memory -> int * int
method decrypt_string : string -> string
method encrypt :
last:bool -> Netsys_types.memory -> Netsys_types.memory -> int * int
method encrypt_string : string -> string
method mac : unit -> string
method padding : Netsys_ciphers.padding
method set_header : string -> unit
method set_iv : string -> unit
method supports_aead : bool
end`