Current File : /opt/imunify360/venv/lib/python3.11/site-packages/Crypto/Util/__pycache__//Counter.cpython-311.pyc
�
��i& � � � dd�Z dS )� � Fc � � | dz dk rt d� � �|� � � }|| k rt d|| fz � � �| dz ||||d�S )a9 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.
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)�
ValueError�
bit_length)�nbitsr r r
r �allow_wraparound�iv_bls �u/builddir/build/BUILD/imunify360-venv-2.6.1/opt/imunify360/venv/lib64/python3.11/site-packages/Crypto/Util/Counter.py�newr s� � �J �� �a����:�;�;�;� � $� $� &� &�E� �u�}�}�� 1� �� �(� )� )� )�
!�A�:� � � *� *� � � r N)r r r FF)r � r r �<module>r s# ��24� 4� 4� 4� 4� 4r 