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ꅭh1	                 @   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ejejG dd deZd	S )
    )absolute_importdivisionprint_function)utils)AlreadyFinalizedUnsupportedAlgorithm_Reasons)_get_backend)HMACBackend)hashesmacc               @   s@   e Zd ZdddZejdZdd Zdd Zd	d
 Z	dd Z
dS )HMACNc             C   sj   t |}t|tstdtjt|tjs2td|| _	|| _
|| _|d kr`| j
j|| j| _n|| _d S )Nz.Backend object does not implement HMACBackend.z*Expected instance of hashes.HashAlgorithm.)r	   
isinstancer
   r   r   ZBACKEND_MISSING_INTERFACEr   ZHashAlgorithm	TypeError
_algorithm_backend_keyZcreate_hmac_ctx	algorithm_ctx)selfkeyr   backendctx r   /usr/lib64/python3.6/hmac.py__init__   s    
zHMAC.__init__r   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   Z_check_byteslikeupdate)r   r   r   r   r   r   *   s    
zHMAC.updatec             C   s.   | j d krtdt| j| j| j| j j dS )NzContext was already finalized.)r   r   )r   r   r   r   r   r   copy)r   r   r   r   r   0   s    
z	HMAC.copyc             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HMAC.finalizec             C   s:   t jd| | jd krtd| jd  }| _|j| d S )N	signaturezContext was already finalized.)r   _check_bytesr   r   verify)r   r    r   r   r   r   r"   A   s
    
zHMAC.verify)NN)__name__
__module____qualname__r   r   Zread_only_propertyr   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
MACContextZHashContextobjectr   r   r   r   r   <module>   s   
