nderlying block cipher, a module from ``Cryptodome.Cipher``.

:Keywords:
  iv : bytes/bytearray/memoryview
    The IV to use for CFB.

  IV : bytes/bytearray/memoryview
    Alias for ``iv``.

  segment_size : integer
    The number of bit the plaintext and ciphertext are segmented in.
    If not present, the default is 8.

Any other keyword will be passed to the underlying block cipher.
See the relevant documentation for details (at least ``key`` will need
to be present).
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