python AES CFB 记录

aescipher=AES.new(aeskey,AES.MODE_CFB,aesiv,segment_size=128)

• segment_size (integer) --
  (Only MODE_CFB).The number of bits the plaintext and ciphertext
  are segmented in. It must be a multiple of 8.
  If not specified, it will be assumed to be 8.

segment_size 不指定时默认值8，
一般设置为分组大小128