Block.cfb_encrypt
Add Cipher Feedback Block (CFB) to the given block cipher in encryption mode. 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
.
transform src spos dst dpos
encrypts or decrypts one block of data. The input data is read from byte array src
at positions spos, ..., spos + blocksize - 1
, and the output data is stored in byte array dst
at positions dpos, ..., dpos + blocksize - 1
.