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o ;j� � @ s� d dl mZmZ d dlmZmZmZmZmZm Z m Z d dl m Z d dl mZ dd� Zdd� Zd d � Zd d � ZG d d� de�Zdd� Zddd�ZdS )� )�bchr�concat_buffers)� VoidPointer� SmartPointer�create_string_buffer�get_raw_buffer�c_size_t� c_uint8_ptr�c_ubyte)� long_to_bytes)�_raw_keccak_libc C sD | dd> k r | dks J �| dkrdn| � � d d }t|�t| � S )z2Left encode function as defined in NIST SP 800-185� � r � � )� bit_lengthr r ��x�num� r �M/opt/saltstack/salt/lib/python3.10/site-packages/Cryptodome/Hash/cSHAKE128.py� _left_encode+ � r c C sD | dd> k r | dks J �| dkrdn| � � d d }t| �t|� S )z3Right encode function as defined in NIST SP 800-185r r r r r )r r r r r r r � _right_encode6 r r c C s. t | �d }|dd> krtd��tt|�| �S )z4Encode string function as defined in NIST SP 800-185r r r z$String too large to encode in cSHAKE)�len� ValueErrorr r )r Zbitlenr r r � _encode_strA s r c C s. t t|�| �}|t|�| | }|d| S )z2Zero pad byte string as defined in NIST SP 800-185� )r r r )r �lengthZto_padZnpadr r r �_bytepadK s r c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) � cSHAKE_XOFz]A cSHAKE hash object. Do not instantiate directly. Use the :func:`new` function. c C s� t � }|s|r t|�t|� }t|d| d �}d| _nd }d| _t�|�� t|d �td��}|r8t d| ��t |� � tj �| _ d| _|rK| �|� |rT| �|� d S d S )Ni@ r � � � z#Error %d while instantiating cSHAKEF)r r r �_paddingr Z keccak_initZ address_ofr r r r �getZkeccak_destroy�_state� _is_squeezing�update) �self�data�customZcapacity�function�stateZ prefix_unpad�prefix�resultr r r �__init__] s0 ��� �zcSHAKE_XOF.__init__c C sH | j rtd��t�| j�� t|�tt|���}|r"t d|| j f ��| S )z�Continue hashing of a message by consuming the next chunk of data. Args: data (byte string/byte array/memoryview): The next chunk of the message being hashed. z/You cannot call 'update' after the first 'read'z Error %d while updating %s state) r' � TypeErrorr Z keccak_absorbr& r% r r r r �name)r) r* r/ r r r r( x s ��zcSHAKE_XOF.updatec C sL d| _ t|�}t�| j�� |t|�t| j��}|r"t d|| j f ��t |�S )ah Compute the next piece of XOF output. .. note:: You cannot use :meth:`update` anymore after the first call to :meth:`read`. Args: length (integer): the amount of bytes this method must return :return: the next piece of XOF output (of the given length) :rtype: byte string Tz!Error %d while extracting from %s) r' r r Zkeccak_squeezer& r% r r r$ r r2 r )r) r Zbfrr/ r r r �read� s ��zcSHAKE_XOF.readN)�__name__� __module__� __qualname__�__doc__r0 r( r3 r r r r r W s r c C s t | |d|�S )N� �r )r* r+ r, r r r �_new� s r: Nc C s t | |dd�S )az Return a fresh instance of a cSHAKE128 object. Args: data (bytes/bytearray/memoryview): Optional. The very first chunk of the message to hash. It is equivalent to an early call to :meth:`update`. custom (bytes): Optional. A customization bytestring (``S`` in SP 800-185). :Return: A :class:`cSHAKE_XOF` object r8 � r9 )r* r+ r r r �new� s r< )NN)ZCryptodome.Util.py3compatr r ZCryptodome.Util._raw_apir r r r r r r ZCryptodome.Util.numberr ZCryptodome.Hash.keccakr r r r r �objectr r: r< r r r r �<module> s $ O
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