U
    [e                     @   sH  d dl Z d dlZd dlmZ d dlmZ G dd de jdZG dd de jdZG d	d
 d
e jdZ	G dd de jdZ
G dd de jdZdd Zdd ZeedddZdd ZG dd deeZG dd dee	ZG dd deZG dd deeZG d d! d!eeZG d"d# d#eeZG d$d% d%ee
ZG d&d' d'eeeZdS )(    N)utils)CipherAlgorithmc                   @   s6   e Zd ZejedddZejeddddZ	dS )Modereturnc                 C   s   dS )z@
        A string naming this mode (e.g. "ECB", "CBC").
        N selfr   r   n/var/www/html/services/stratfitenv/lib/python3.8/site-packages/cryptography/hazmat/primitives/ciphers/modes.pyname   s    z	Mode.nameN)	algorithmr   c                 C   s   dS )zq
        Checks that all the necessary invariants of this (mode, algorithm)
        combination are met.
        Nr   r	   r   r   r   r
   validate_for_algorithm   s    zMode.validate_for_algorithm)
__name__
__module____qualname__abcabstractpropertystrr   abstractmethodr   r   r   r   r   r
   r      s   r   )	metaclassc                   @   s    e Zd ZejedddZdS )ModeWithInitializationVectorr   c                 C   s   dS )zP
        The value of the initialization vector for this mode as bytes.
        Nr   r   r   r   r
   initialization_vector   s    z2ModeWithInitializationVector.initialization_vectorN)r   r   r   r   r   bytesr   r   r   r   r
   r      s   r   c                   @   s    e Zd ZejedddZdS )ModeWithTweakr   c                 C   s   dS )z@
        The value of the tweak for this mode as bytes.
        Nr   r   r   r   r
   tweak%   s    zModeWithTweak.tweakN)r   r   r   r   r   r   r   r   r   r   r
   r   $   s   r   c                   @   s    e Zd ZejedddZdS )ModeWithNoncer   c                 C   s   dS )z@
        The value of the nonce for this mode as bytes.
        Nr   r   r   r   r
   nonce-   s    zModeWithNonce.nonceN)r   r   r   r   r   r   r   r   r   r   r
   r   ,   s   r   c                   @   s    e Zd ZejedddZdS )ModeWithAuthenticationTagr   c                 C   s   dS )zP
        The value of the tag supplied to the constructor of this mode.
        Nr   r   r   r   r
   tag5   s    zModeWithAuthenticationTag.tagN)r   r   r   r   r   r   r   r   r   r   r
   r   4   s   r   c                 C   s    |j dkr|jdkrtdd S )N   ZAESz=Only 128, 192, and 256 bit keys are allowed for this AES mode)key_sizer   
ValueErrorr   r   r   r
   _check_aes_key_length<   s    r#   c                 C   s0   t | jd |jkr,tdt | j| jd S )N   zInvalid IV size ({}) for {}.)lenr   
block_sizer"   formatr   r   r   r   r
   _check_iv_lengthC   s     r(   )r   r   c                 C   s*   t | d |jkr&tdt | |d S )Nr$   zInvalid nonce size ({}) for {}.)r%   r&   r"   r'   )r   r   r   r   r   r
   _check_nonce_lengthL   s    r)   c                 C   s   t | | t| | d S N)r#   r(   r   r   r   r
   _check_iv_and_key_lengthS   s    
r+   c                   @   s,   e Zd Zd ZedddZedZe	Z
dS )CBCr   c                 C   s   t d| || _d S Nr   r   _check_byteslike_initialization_vectorr	   r   r   r   r
   __init__[   s    zCBC.__init__r1   Nr   r   r   r   r   r3   r   read_only_propertyr   r+   r   r   r   r   r
   r,   X   s   
r,   c                   @   s6   e Zd Zd ZedddZedZe	dddZ
dS )	XTS)r   c                 C   s*   t d| t|dkr td|| _d S )Nr      z!tweak must be 128-bits (16 bytes))r   r0   r%   r"   _tweak)r	   r   r   r   r
   r3   f   s    zXTS.__init__r8   r   c                 C   s   |j dkrtdd S )N)r    i   z\The XTS specification requires a 256-bit key for AES-128-XTS and 512-bit key for AES-256-XTS)r!   r"   r   r   r   r
   r   p   s    
zXTS.validate_for_algorithmN)r   r   r   r   r   r3   r   r5   r   r   r   r   r   r   r
   r6   c   s   
r6   c                   @   s   e Zd Zd ZeZdS )ECBN)r   r   r   r   r#   r   r   r   r   r
   r:   x   s   r:   c                   @   s,   e Zd Zd ZedddZedZe	Z
dS )OFBr-   c                 C   s   t d| || _d S r.   r/   r2   r   r   r
   r3      s    zOFB.__init__r1   Nr4   r   r   r   r
   r;   ~   s   
r;   c                   @   s,   e Zd Zd ZedddZedZe	Z
dS )CFBr-   c                 C   s   t d| || _d S r.   r/   r2   r   r   r
   r3      s    zCFB.__init__r1   Nr4   r   r   r   r
   r<      s   
r<   c                   @   s,   e Zd Zd ZedddZedZe	Z
dS )CFB8r-   c                 C   s   t d| || _d S r.   r/   r2   r   r   r
   r3      s    zCFB8.__init__r1   Nr4   r   r   r   r
   r=      s   
r=   c                   @   s6   e Zd Zd ZedddZedZe	dddZ
dS )	CTR)r   c                 C   s   t d| || _d S )Nr   )r   r0   _nonce)r	   r   r   r   r
   r3      s    zCTR.__init__r?   r9   c                 C   s   t | | t| j| j| d S r*   )r#   r)   r   r   r   r   r   r
   r      s    
zCTR.validate_for_algorithmN)r   r   r   r   r   r3   r   r5   r   r   r   r   r   r   r
   r>      s   
r>   c                   @   sT   e Zd Zd ZdZdZdeeje e	dddZ
edZed	Zed
ddZdS )GCMl   ? l            Nr7   )r   r   min_tag_lengthc                 C   s   t d| t|dk s$t|dkr,td|| _|d k	rpt d| |dk rVtdt||k rptd||| _|| _d S )	Nr   r$      zIinitialization_vector must be between 8 and 128 bytes (64 and 1024 bits).r      zmin_tag_length must be >= 4z.Authentication tag must be {} bytes or longer.)	r   r0   r%   r"   r1   _check_bytesr'   _tagZ_min_tag_length)r	   r   r   rA   r   r   r
   r3      s$    zGCM.__init__rE   r1   r9   c                 C   s   t | | d S r*   )r#   r   r   r   r
   r      s    zGCM.validate_for_algorithm)Nr7   )r   r   r   r   Z_MAX_ENCRYPTED_BYTESZ_MAX_AAD_BYTESr   typingOptionalintr3   r   r5   r   r   r   r   r   r   r   r
   r@      s     

r@   )r   rF   Zcryptographyr   Z/cryptography.hazmat.primitives._cipheralgorithmr   ABCMetar   r   r   r   r   r#   r(   r   r   r)   r+   r,   r6   r:   r;   r<   r=   r>   r@   r   r   r   r
   <module>   s(   	