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Current File : /usr/lib/python3/dist-packages/Cryptodome/Util/__pycache__/Counter.cpython-311.pyc
�

8�tc&���dd�ZdS)��Fc��|dzdkrtd���|���}||krtd||fz���|dz||||d�S)a9Create a stateful counter block function suitable for CTR encryption modes.

    Each call to the function returns the next counter block.
    Each counter block is made up by three parts:

    +------+--------------+-------+
    |prefix| counter value|postfix|
    +------+--------------+-------+

    The counter value is incremented by 1 at each call.

    Args:
      nbits (integer):
        Length of the desired counter value, in bits. It must be a multiple of 8.
      prefix (byte string):
        The constant prefix of the counter block. By default, no prefix is
        used.
      suffix (byte string):
        The constant postfix of the counter block. By default, no suffix is
        used.
      initial_value (integer):
        The initial value of the counter. Default value is 1.
        Its length in bits must not exceed the argument ``nbits``.
      little_endian (boolean):
        If ``True``, the counter number will be encoded in little endian format.
        If ``False`` (default), in big endian format.
      allow_wraparound (boolean):
        This parameter is ignored.
    Returns:
      An object that can be passed with the :data:`counter` parameter to a CTR mode
      cipher.

    It must hold that *len(prefix) + nbits//8 + len(suffix)* matches the
    block size of the underlying block cipher.
    ��z'nbits' must be a multiple of 8zGInitial value takes %d bits but it is longer than the counter (%d bits))�counter_len�prefix�suffix�
initial_value�
little_endian)�
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bit_length)�nbitsrr	r
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