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3
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 |j
 dkst|dj| S )N   z>Q   r          i)r   r   r   	encryptorlenrangeupdatestructpackunpackfinalizeAssertionError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$   r%   )r   r   
ValueErrorr   r"   )r   r'   r   r   r   r    )r'   r!   aes_key_wrap%   s    r*   c       
      C   s   t t| t |j }t|}xttdD ]p}xjtt|D ]Z}tjdtj	d|d || | d A ||  }|j
|}	|	d d }|	dd  ||< q>W q,W |j dkst||fS )Nr
   z>Qr   r   r   r   i)r   r   r   	decryptorr   reversedr   r   r   r   r   r   r   )
r   r   r   r   r+   r   r   r   Zatrr   r    r    r!   _unwrap_core5   s    "

r-   c                s   t |}t| dkrtddtjdt  }dt d  d } d|   t dkrtt| t |j }|j	|  }|j
 d	kst|S  fd
dtdt dD }t| |||S d S )Nr#   r$   r%   z/The wrapping key must be a valid AES key lengths   YYz>ir       r   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$   r%   )r   r   r)   r   r   r   r   r   r   r   r   r   r   r"   )r   r'   r   aivZpadr   r   r   r    )r'   r!   aes_key_wrap_with_paddingL   s    r0   c                s  t |}t dk rtdt| dkr0tdt dkrtt| t |j }|j }|j	 dkslt
|d d }|dd  }d}nL fd	d
tdt dD }|jd}	t|}t| |	||\}}dj|}tjd|dd  \}
d| |
 }t|d d d s^d|d  |
  k o.d| kn   s^|dkrdt|| d  d|  rdt |dkrr|S |d |  S d S )Nr#   zMust be at least 16 bytesr$   r%   z/The wrapping key must be a valid AES key lengthr   r   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   z>I   s   YYr.   )r#   r$   r%   )r   r   InvalidUnwrapr)   r   r   r   r+   r   r   r   r   popr-   r   r   r   r	   )r   r1   r   r+   r   r   datar   r   Zencrypted_aivZmlir    )r1   r!   aes_key_unwrap_with_padding`   s4    


*&
r6   c                s   t |}t dk rtdt d dkr4tdt| dkrHtdd	} fd
dtdt dD }|jd}t| |||\}}t||st dj|S )Nr$   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   )r1   r    r!   r(      s    z"aes_key_unwrap.<locals>.<listcomp>r   )r#   r$   r%   )	r   r   r3   r)   r   r4   r-   r	   r   )r   r1   r   r/   r   r   r    )r1   r!   aes_key_unwrap   s    

r7   c               @   s   e Zd ZdS )r3   N)__name__
__module____qualname__r    r    r    r!   r3      s   r3   )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-   r0   r6   r7   	Exceptionr3   r    r    r    r!   <module>   s   


+
