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l_                 @   s   d dl mZmZmZ d dlmZ d dlmZmZm	Z	m
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 d dlmZ d dlmZ d dlmZ d dlmZ ejeG dd	 d	eZd
S )    )absolute_importdivisionprint_function)utils)AlreadyFinalized
InvalidKeyUnsupportedAlgorithm_Reasons)_get_backend)PBKDF2HMACBackend)constant_time)KeyDerivationFunctionc               @   s&   e Zd ZdddZdd Zdd ZdS )	
PBKDF2HMACNc             C   sp   t |}t|tstdtj|j|s<tdj|jtj	d| _
|| _|| _tjd| || _|| _|| _d S )Nz4Backend object does not implement PBKDF2HMACBackend.z/{} is not supported for PBKDF2 by this backend.Fsalt)r
   
isinstancer   r   r	   ZBACKEND_MISSING_INTERFACEZpbkdf2_hmac_supportedformatnameZUNSUPPORTED_HASH_used
_algorithm_lengthr   _check_bytes_salt_iterations_backend)self	algorithmZlengthr   Z
iterationsZbackend r   /usr/lib64/python3.6/pbkdf2.py__init__   s"    

zPBKDF2HMAC.__init__c             C   s<   | j rtdd| _ tjd| | jj| j| j| j| j	|S )Nz'PBKDF2 instances can only be used once.Tkey_material)
r   r   r   Z_check_bytesliker   Zderive_pbkdf2_hmacr   r   r   r   )r   r   r   r   r   derive-   s    zPBKDF2HMAC.derivec             C   s"   | j |}tj||stdd S )NzKeys do not match.)r    r   Zbytes_eqr   )r   r   Zexpected_keyZderived_keyr   r   r   verify;   s    
zPBKDF2HMAC.verify)N)__name__
__module____qualname__r   r    r!   r   r   r   r   r      s   
r   N)Z
__future__r   r   r   Zcryptographyr   Zcryptography.exceptionsr   r   r   r	   Zcryptography.hazmat.backendsr
   Z'cryptography.hazmat.backends.interfacesr   Zcryptography.hazmat.primitivesr   Z"cryptography.hazmat.primitives.kdfr   Zregister_interfaceobjectr   r   r   r   r   <module>   s   