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ꅭh                 @   s|   d dl mZmZm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 d dlmZmZ ejejG dd deZd	S )
    )absolute_importdivisionprint_function)utils)AlreadyFinalizedUnsupportedAlgorithm_Reasons)_get_backend)CMACBackend)ciphersmacc               @   s6   e Zd ZdddZdd Zdd Zdd	 Zd
d ZdS )CMACNc             C   sb   t |}t|tstdtjt|tjs2td|| _	|| _
|d krX| j
j| j	| _n|| _d S )Nz.Backend object does not implement CMACBackend.z*Expected instance of BlockCipherAlgorithm.)r	   
isinstancer
   r   r   ZBACKEND_MISSING_INTERFACEr   ZBlockCipherAlgorithm	TypeError
_algorithm_backendZcreate_cmac_ctx_ctx)self	algorithmbackendctx r   /usr/lib64/python3.6/cmac.py__init__   s    
zCMAC.__init__c             C   s.   | j d krtdtjd| | j j| d S )NzContext was already finalized.data)r   r   r   _check_bytesupdate)r   r   r   r   r   r   &   s    
zCMAC.updatec             C   s&   | j d krtd| j j }d | _ |S )NzContext was already finalized.)r   r   finalize)r   Zdigestr   r   r   r   -   s
    

zCMAC.finalizec             C   s:   t jd| | jd krtd| jd  }| _|j| d S )N	signaturezContext was already finalized.)r   r   r   r   verify)r   r   r   r   r   r   r   4   s
    
zCMAC.verifyc             C   s*   | j d krtdt| j| j| j j dS )NzContext was already finalized.)r   r   )r   r   r   r   r   copy)r   r   r   r   r    <   s    
z	CMAC.copy)NN)__name__
__module____qualname__r   r   r   r   r    r   r   r   r   r      s
   
r   N)Z
__future__r   r   r   Zcryptographyr   Zcryptography.exceptionsr   r   r   Zcryptography.hazmat.backendsr	   Z'cryptography.hazmat.backends.interfacesr
   Zcryptography.hazmat.primitivesr   r   Zregister_interfaceZ
MACContextobjectr   r   r   r   r   <module>   s   