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l_                 @   s   d dl mZmZmZ d dlZd dlZd dlmZ d dlm	Z	 d dl
mZ ejejG dd deZejeG dd	 d	eZejeG d
d deZejeG dd deZG dd deZdd ZdS )    )absolute_importdivisionprint_functionN)utils)hashes)rsac               @   s   e Zd Zejdd ZdS )AsymmetricPaddingc             C   s   dS )zE
        A string naming this padding (e.g. "PSS", "PKCS1").
        N )selfr	   r	   /usr/lib64/python3.6/padding.pyname   s    zAsymmetricPadding.nameN)__name__
__module____qualname__abcabstractpropertyr   r	   r	   r	   r   r      s   r   c               @   s   e Zd ZdZdS )PKCS1v15zEMSA-PKCS1-v1_5N)r   r   r   r   r	   r	   r	   r   r      s   r   c               @   s   e Zd Ze ZdZdd ZdS )PSSzEMSA-PSSc             C   sJ   || _ t|tj r&|| jk	r&td|| jk	r@|dk r@td|| _d S )Nzsalt_length must be an integer.r   z$salt_length must be zero or greater.)_mgf
isinstancesixZinteger_types
MAX_LENGTH	TypeError
ValueErrorZ_salt_length)r
   mgfsalt_lengthr	   r	   r   __init__#   s    
zPSS.__init__N)r   r   r   objectr   r   r   r	   r	   r	   r   r      s   r   c               @   s   e Zd ZdZdd ZdS )OAEPzEME-OAEPc             C   s*   t |tjstd|| _|| _|| _d S )Nz*Expected instance of hashes.HashAlgorithm.)r   r   HashAlgorithmr   r   
_algorithmZ_label)r
   r   	algorithmZlabelr	   r	   r   r   6   s
    zOAEP.__init__N)r   r   r   r   r   r	   r	   r	   r   r   2   s   r   c               @   s   e Zd Ze Zdd ZdS )MGF1c             C   s   t |tjstd|| _d S )Nz*Expected instance of hashes.HashAlgorithm.)r   r   r   r   r    )r
   r!   r	   r	   r   r   B   s    zMGF1.__init__N)r   r   r   r   r   r   r	   r	   r	   r   r"   ?   s   r"   c             C   sF   t | tjtjfstd| jd d }||j d }|dksBt|S )Nz(key must be an RSA public or private key         r   )r   r   ZRSAPrivateKeyZRSAPublicKeyr   Zkey_sizeZdigest_sizeAssertionError)keyZhash_algorithmZemlenr   r	   r	   r   calculate_max_pss_salt_lengthI   s    r(   )Z
__future__r   r   r   r   r   Zcryptographyr   Zcryptography.hazmat.primitivesr   Z)cryptography.hazmat.primitives.asymmetricr   Zadd_metaclassABCMetar   r   Zregister_interfacer   r   r   r"   r(   r	   r	   r	   r   <module>   s   
