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3
lá˜_Ü  ã               @   s˜   d dl mZmZmZ d dl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d	 ZejeƒG d
d„ deƒƒZdS )é    )Úabsolute_importÚdivisionÚprint_functionN)Úutils)ÚAlreadyFinalizedÚ
InvalidKeyÚUnsupportedAlgorithmÚ_Reasons)Ú_get_backend)ÚScryptBackend)Úconstant_time)ÚKeyDerivationFunctioné   c               @   s&   e Zd Zddd„Zdd„ Zdd„ ZdS )	ÚScryptNc             C   s˜   t |ƒ}t|tƒstdtjƒ‚|| _tjd|ƒ |dk sH||d @ dkrPt	dƒ‚|dk r`t	dƒ‚|dk rpt	dƒ‚d	| _
|| _|| _|| _|| _|| _d S )
Nz0Backend object does not implement ScryptBackend.Úsaltr   é   r   z-n must be greater than 1 and be a power of 2.z%r must be greater than or equal to 1.z%p must be greater than or equal to 1.F)r
   Ú
isinstancer   r   r	   ZBACKEND_MISSING_INTERFACEÚ_lengthr   Ú_check_bytesÚ
ValueErrorÚ_usedÚ_saltÚ_nÚ_rÚ_pÚ_backend)Úselfr   ZlengthÚnÚrÚpZbackend© r    ú/usr/lib64/python3.6/scrypt.pyÚ__init__   s&    
zScrypt.__init__c             C   s@   | j rtdƒ‚d| _ tjd|ƒ | jj|| j| j| j| j	| j
ƒS )Nz'Scrypt instances can only be used once.TÚkey_material)r   r   r   Z_check_bytesliker   Zderive_scryptr   r   r   r   r   )r   r#   r    r    r!   Úderive7   s    zScrypt.derivec             C   s"   | j |ƒ}tj||ƒstdƒ‚d S )NzKeys do not match.)r$   r   Zbytes_eqr   )r   r#   Zexpected_keyZderived_keyr    r    r!   ÚverifyA   s    
zScrypt.verify)N)Ú__name__Ú
__module__Ú__qualname__r"   r$   r%   r    r    r    r!   r      s   

r   )Z
__future__r   r   r   ÚsysZ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   ÚmaxsizeZ
_MEM_LIMITZregister_interfaceÚobjectr   r    r    r    r!   Ú<module>   s   
