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l_b                 @   s   d dl mZmZmZ d dlZd dlmZ d dlmZ d dl	m
Z
 d dlmZ d dlmZ dd	 Zdd
dZdd ZdddZdddZdddZG dd deZdS )    )absolute_importdivisionprint_functionN)_get_backend)Cipher)AES)ECB)bytes_eqc       	   	   C   s   t t| t |j }t|}xttdD ]h}xbt|D ]V}|j|||  }tjdtj	d|d d d || | d A }|dd  ||< q6W q(W |dj
| S )N   z>Q   r          i)r   r   r   	encryptorlenrangeupdatestructpackunpackjoin)	wrapping_keyarbackendr   njib r   /usr/lib64/python3.6/keywrap.py
_wrap_core   s    ,r    c                sx   t |}t| dkrtdt dk r0tdt d dkrHtdd	} fd
dtdt dD }t| |||S )N          z/The wrapping key must be a valid AES key lengthz)The key to wrap must be at least 16 bytesr   r   z-The key to wrap must be a multiple of 8 bytess   c                s   g | ]} ||d   qS )r   r   ).0r   )key_to_wrapr   r   
<listcomp>1   s    z aes_key_wrap.<locals>.<listcomp>)r!   r"   r#   )r   r   
ValueErrorr   r    )r   r%   r   r   r   r   )r%   r   aes_key_wrap%   s    r(   c       
      C   s   t t| t |j }t|}xttdD ]p}xjtt|D ]Z}tjdtj	d|d || | d A ||  }|j
|}	|	d d }|	dd  ||< q>W q,W ||fS )Nr
   z>Qr   r   r   i)r   r   r   	decryptorr   reversedr   r   r   r   r   )
r   r   r   r   r)   r   r   r   Zatrr   r   r   r   _unwrap_core5   s    "

r+   c                s   t |}t| dkrtddtjdt  }dt d  d } d|   t dkrtt| t |j }|j	|  }|S  fd	d
t
dt dD }t| |||S d S )Nr!   r"   r#   z/The wrapping key must be a valid AES key lengths   YYz>ir       c                s   g | ]} ||d   qS )r   r   )r$   r   )r%   r   r   r&   \   s    z-aes_key_wrap_with_padding.<locals>.<listcomp>r   )r!   r"   r#   )r   r   r'   r   r   r   r   r   r   r   r   r    )r   r%   r   aivZpadr   r   r   r   )r%   r   aes_key_wrap_with_paddingL   s    r.   c                st  t |}t dk rtdt| dkr0tdt dkrztt| t |j }|j }|d d }|dd  }d}nL fdd	t	d
t dD }|j
d
}	t|}t| |	||\}}dj|}tjd|dd  \}
d| |
 }t|d d d sNd|d  |
  k od| kn   sN|d
krTt|| d  d|  rTt |d
krb|S |d |  S d S )Nr!   zMust be at least 16 bytesr"   r#   z/The wrapping key must be a valid AES key lengthr   r   c                s   g | ]} ||d   qS )r   r   )r$   r   )wrapped_keyr   r   r&   q   s    z/aes_key_unwrap_with_padding.<locals>.<listcomp>r   r   z>I   s   YYr,   )r!   r"   r#   )r   r   InvalidUnwrapr'   r   r   r   r)   r   r   popr+   r   r   r   r	   )r   r/   r   r)   r   r   datar   r   Zencrypted_aivZmlir   )r/   r   aes_key_unwrap_with_padding`   s2    


*&
r4   c                s   t |}t dk rtdt d dkr4tdt| dkrHtdd	} fd
dtdt dD }|jd}t| |||\}}t||st dj|S )Nr"   zMust be at least 24 bytesr   r   z-The wrapped key must be a multiple of 8 bytesr!   r#   z/The wrapping key must be a valid AES key lengths   c                s   g | ]} ||d   qS )r   r   )r$   r   )r/   r   r   r&      s    z"aes_key_unwrap.<locals>.<listcomp>r   )r!   r"   r#   )	r   r   r1   r'   r   r2   r+   r	   r   )r   r/   r   r-   r   r   r   )r/   r   aes_key_unwrap   s    

r5   c               @   s   e Zd ZdS )r1   N)__name__
__module____qualname__r   r   r   r   r1      s   r1   )N)N)N)N)Z
__future__r   r   r   r   Zcryptography.hazmat.backendsr   Z&cryptography.hazmat.primitives.ciphersr   Z1cryptography.hazmat.primitives.ciphers.algorithmsr   Z,cryptography.hazmat.primitives.ciphers.modesr   Z,cryptography.hazmat.primitives.constant_timer	   r    r(   r+   r.   r4   r5   	Exceptionr1   r   r   r   r   <module>   s   


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