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o ;j� � @ s ddd�Z dS )� � Fc C sH | d dkr t d��|�� }|| krt d|| f ��| d ||||d�S )a� Create 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. An ``OverflowError`` exception is always raised when the counter wraps around to zero. 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))Z counter_len�prefix�suffix� initial_value� little_endian)� ValueError� bit_length)�nbitsr r r r Zallow_wraparoundZiv_bl� r �K/opt/saltstack/salt/lib/python3.10/site-packages/Cryptodome/Util/Counter.py�new s '��r N)r r r FF)r r r r r �<module> s
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