o
    b                     @   sd   d dl Z d dlmZ d dlmZmZmZ d dlmZ d dl	m
Z
mZ d dlmZ G dd deZdS )	    N)utils)AlreadyFinalizedUnsupportedAlgorithm_Reasons)_get_backend)BackendCMACBackend)ciphersc                   @   sh   e Zd Z		ddejdeje fddZde	ddfdd	Z
de	fd
dZde	ddfddZdddZdS )CMACN	algorithmbackendc                 C   sd   t |}t|tstdtjt|tjstd|| _	|| _
|d u r-| j
| j	| _d S || _d S )Nz.Backend object does not implement CMACBackend.z*Expected instance of BlockCipherAlgorithm.)r   
isinstancer   r   r   ZBACKEND_MISSING_INTERFACEr	   BlockCipherAlgorithm	TypeError
_algorithm_backendZcreate_cmac_ctx_ctx)selfr   r   ctx r   b/var/www/secure340b-portal/env/lib/python3.10/site-packages/cryptography/hazmat/primitives/cmac.py__init__   s   

zCMAC.__init__datareturnc                 C   s.   | j d u r	tdtd| | j | d S )NContext was already finalized.r   )r   r   r   _check_bytesupdate)r   r   r   r   r   r   +   s   
zCMAC.updatec                 C   s&   | j d u r	td| j  }d | _ |S )Nr   )r   r   finalize)r   digestr   r   r   r   2   s
   

zCMAC.finalize	signaturec                 C   s:   t d| | jd u rtd| jd }| _|| d S )Nr   r   )r   r   r   r   verify)r   r   r   r   r   r   r    9   s
   
zCMAC.verifyc                 C   s*   | j d u r	tdt| j| j| j  dS )Nr   )r   r   )r   r   r
   r   r   copy)r   r   r   r   r!   A   s
   
z	CMAC.copy)NN)r   r
   )__name__
__module____qualname__r	   r   typingOptionalr   r   bytesr   r   r    r!   r   r   r   r   r
      s    
r
   )r%   Zcryptographyr   Zcryptography.exceptionsr   r   r   Zcryptography.hazmat.backendsr   Z'cryptography.hazmat.backends.interfacesr   r   Zcryptography.hazmat.primitivesr	   objectr
   r   r   r   r   <module>   s   