U
    *}fb                     @   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 | }t|}tdD ]d}t|D ]V}||||  }tdt	d|d d d || | d A }|dd  ||< q2q&|
 dkst|d| S )N   >Q   r          )r   r   r   	encryptorlenrangeupdatestructpackunpackfinalizeAssertionErrorjoin)	wrapping_keyarbackendr   njib r"   J/tmp/pip-unpacked-wheel-x36vw73o/cryptography/hazmat/primitives/keywrap.py
_wrap_core   s     &r$   c                    sx   t |}t| dkrtdt dk r0tdt d dkrHtdd} fd	d
tdt dD }t| |||S )N          /The wrapping key must be a valid AES key lengthr&   z)The key to wrap must be at least 16 bytesr   r   z-The key to wrap must be a multiple of 8 bytes   c                    s   g | ]} ||d   qS r   r"   .0r    key_to_wrapr"   r#   
<listcomp>1   s     z aes_key_wrap.<locals>.<listcomp>)r   r   
ValueErrorr   r$   )r   r/   r   r   r   r"   r.   r#   aes_key_wrap%   s    r2   c           
   	   C   s   t t| t | }t|}ttdD ]l}tt|D ]Z}tdt	d|d || | d A ||  }|
|}	|	d d }|	dd  ||< q:q*| dkst||fS )Nr
   r   r   r   r   r   r   )r   r   r   	decryptorr   reversedr   r   r   r   r   r   r   )
r   r   r   r   r3   r   r   r    Zatrr!   r"   r"   r#   _unwrap_core5   s      
r5   c                    s   t |}t| dkrtddtdt  }dt d  d } d|   t dkrtt| t | }|	|  }|
 dkst|S  fdd	td
t dD }t| |||S d S )Nr%   r)      YYz>ir       r   c                    s   g | ]} ||d   qS r+   r"   r,   r.   r"   r#   r0   \   s     z-aes_key_wrap_with_padding.<locals>.<listcomp>r   )r   r   r1   r   r   r   r   r   r   r   r   r   r   r$   )r   r/   r   aivpadr   r!   r   r"   r.   r#   aes_key_wrap_with_paddingL   s    r:   c                    s~  t |}t dk rtdt| dkr0tdt dkrtt| t | }| }|	 dkslt
|d d }|dd  }d}nL fdd	td
t dD }|d
}	t|}t| |	||\}}d|}td|dd  \}
d| |
 }t|d d drXd|d  |
  k r0d| krXn n$|d
kr^t|| d  d| s^t |d
krl|S |d |  S d S )Nr&   zMust be at least 16 bytesr%   r)   r   r   r   c                    s   g | ]} ||d   qS r+   r"   r,   wrapped_keyr"   r#   r0   q   s     z/aes_key_unwrap_with_padding.<locals>.<listcomp>r   z>I   r6   r7   )r   r   InvalidUnwrapr1   r   r   r   r3   r   r   r   r   popr5   r   r   r   r	   )r   r<   r   r3   r!   r   datar   r   Zencrypted_aivZmlir"   r;   r#   aes_key_unwrap_with_padding`   sD    



 

rA   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 }|d}t| |||\}}t||st d|S )Nr'   zMust be at least 24 bytesr   r   z-The wrapped key must be a multiple of 8 bytesr%   r)   r*   c                    s   g | ]} ||d   qS r+   r"   r,   r;   r"   r#   r0      s     z"aes_key_unwrap.<locals>.<listcomp>r   )	r   r   r>   r1   r   r?   r5   r	   r   )r   r<   r   r8   r   r   r"   r;   r#   aes_key_unwrap   s    

rB   c                   @   s   e Zd ZdS )r>   N)__name__
__module____qualname__r"   r"   r"   r#   r>      s   r>   )N)N)N)N)
__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$   r2   r5   r:   rA   rB   	Exceptionr>   r"   r"   r"   r#   <module>   s   


+
