�
1�Dg& � � � 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.
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initial_value�
little_endian)�
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bit_length)�nbitsr r r
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!�A�:� � � *� *� � � r N)r r r FF)r � r r �<module>r s# ��24� 4� 4� 4� 4� 4r | Name | Type | Size | Permission | Actions |
|---|---|---|---|---|
| Counter.cpython-311.pyc | File | 2.2 KB | 0644 |
|
| Padding.cpython-311.pyc | File | 3.59 KB | 0644 |
|
| RFC1751.cpython-311.pyc | File | 16.95 KB | 0644 |
|
| __init__.cpython-311.pyc | File | 1.16 KB | 0644 |
|
| _cpu_features.cpython-311.pyc | File | 962 B | 0644 |
|
| _file_system.cpython-311.pyc | File | 1.3 KB | 0644 |
|
| _raw_api.cpython-311.pyc | File | 13.82 KB | 0644 |
|
| asn1.cpython-311.pyc | File | 43.49 KB | 0644 |
|
| number.cpython-311.pyc | File | 65.64 KB | 0644 |
|
| py3compat.cpython-311.pyc | File | 7.35 KB | 0644 |
|
| strxor.cpython-311.pyc | File | 4.74 KB | 0644 |
|