class type block_cipher = object .. end
Abstract interface for a block cipher.
method blocksize : int
The size in bytes of the blocks manipulated by the cipher.
method transform : string -> int -> string -> int -> unit
transform src spos dst dpos encrypts or decrypts one block
of data. The input data is read from string src at
positions spos, ..., spos + blocksize - 1, and the output
data is stored in string dst at positions
dpos, ..., dpos + blocksize - 1.
method wipe : unit
Erase the internal state of the block cipher, such as
all key-dependent material.