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3
lá˜_¬  ã               @   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
Z
 d dlmZ d dlmZ d dlmZ d dlmZ ejeƒG dd	„ d	eƒƒZd
S )é    )Úabsolute_importÚdivisionÚprint_function)Úutils)ÚAlreadyFinalizedÚ
InvalidKeyÚUnsupportedAlgorithmÚ_Reasons)Ú_get_backend)ÚPBKDF2HMACBackend)Úconstant_time)ÚKeyDerivationFunctionc               @   s&   e Zd Zddd„Zdd„ Zdd„ ZdS )	Ú
PBKDF2HMACNc             C   sp   t |ƒ}t|tƒstdtjƒ‚|j|ƒs<tdj|jƒtj	ƒ‚d| _
|| _|| _tjd|ƒ || _|| _|| _d S )Nz4Backend object does not implement PBKDF2HMACBackend.z/{} is not supported for PBKDF2 by this backend.FÚsalt)r
   Ú
isinstancer   r   r	   ZBACKEND_MISSING_INTERFACEZpbkdf2_hmac_supportedÚformatÚnameZUNSUPPORTED_HASHÚ_usedÚ
_algorithmÚ_lengthr   Ú_check_bytesÚ_saltÚ_iterationsÚ_backend)ÚselfÚ	algorithmZlengthr   Z
iterationsZbackend© r   ú/usr/lib64/python3.6/pbkdf2.pyÚ__init__   s"    

zPBKDF2HMAC.__init__c             C   s<   | j rtdƒ‚d| _ tjd|ƒ | jj| j| j| j| j	|ƒS )Nz'PBKDF2 instances can only be used once.TÚkey_material)
r   r   r   Z_check_bytesliker   Zderive_pbkdf2_hmacr   r   r   r   )r   r   r   r   r   Úderive-   s    zPBKDF2HMAC.derivec             C   s"   | j |ƒ}tj||ƒstdƒ‚d S )NzKeys do not match.)r    r   Zbytes_eqr   )r   r   Zexpected_keyZderived_keyr   r   r   Úverify;   s    
zPBKDF2HMAC.verify)N)Ú__name__Ú
__module__Ú__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_interfaceÚobjectr   r   r   r   r   Ú<module>   s   