def _make_cipher(initialization_vector, secret):
 return AES.new(secret[:KEY_SIZE], AES.MODE_CBC, initialization_vector[:AES.block_size])

def _make_cipher ( initialization_vector , secret ) : return AES . new ( secret [ : KEY_SIZE ] , AES . MODE_CBC , initialization_vector [ : AES . block_size ] )
return a block cipher object for use in encrypt and decrypt .