o
    )%a	                     @   sZ   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 G dd dejZdS )	    )utils)AlreadyFinalizedUnsupportedAlgorithm_Reasons)_get_backend)HMACBackend)hashesc                   @   sl   e Zd Z		ddedejfddZedZ	deddfd	d
Z
dddZdefddZdeddfddZdS )HMACNkey	algorithmc                 C   sl   t |}t|tstdtjt|tjstd|| _	|| _
|| _|d u r1| j
|| j| _d S || _d S )Nz.Backend object does not implement HMACBackend.z*Expected instance of hashes.HashAlgorithm.)r   
isinstancer   r   r   BACKEND_MISSING_INTERFACEr   HashAlgorithm	TypeError
_algorithm_backend_keycreate_hmac_ctxr   _ctx)selfr
   r   backendctx r   E/usr/lib/python3/dist-packages/cryptography/hazmat/primitives/hmac.py__init__   s   

zHMAC.__init__r   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_byteslikeupdate)r   r   r   r   r   r   -   s   
zHMAC.updatec                 C   s.   | j d u r	tdt| j| j| j| j  dS )Nr   )r   r   )r   r   r	   r   r   r   copy)r   r   r   r   r    3   s   
z	HMAC.copyc                 C   s&   | j d u r	td| j  }d | _ |S )Nr   )r   r   finalize)r   digestr   r   r   r!   =   s
   

zHMAC.finalize	signaturec                 C   s:   t d| | jd u rtd| jd }| _|| d S )Nr#   r   )r   _check_bytesr   r   verify)r   r#   r   r   r   r   r%   D   s
   
zHMAC.verify)NN)r   r	   )__name__
__module____qualname__bytesr   r   r   r   read_only_propertyr   r   r    r!   r%   r   r   r   r   r	      s    



r	   N)cryptographyr   cryptography.exceptionsr   r   r   cryptography.hazmat.backendsr   'cryptography.hazmat.backends.interfacesr   cryptography.hazmat.primitivesr   HashContextr	   r   r   r   r   <module>   s   