Cryptokit.Block.ofb

# Class Cryptokit.Block.ofb

    class ofb : ?iv:string ->
           int -> block_cipher -> block_cipher

Add Output Feedback Block (OFB) to the given block cipher. The integer argument `n` is the number of bytes processed at a time; it must lie between `1` and the block size of the underlying cipher, included. The returned block cipher has block size `n`. It is usable both for encryption and decryption.