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U �e�]� � @ s� d dl mZmZmZ d dlZd dlZd dlmZ e�ej �G dd� de ��Z e�ej �G dd� de ��Z e�ej �G dd � d e ��Z e�ej �G d d � d e ��Ze�ej �G d d � d e ��Zdd� Zdd� Zdd� Ze�e �e�e �G dd� de ���Ze�e �e�e �G dd� de ���Ze�e �G dd� de ��Ze�e �e�e �G dd� de ���Ze�e �e�e �G d d � d e ���Ze�e �e�e �G d d � d e ���Ze�e �e�e�G d d!� d!e ���Ze�e �e�e �e�e�G d"d#� d#e ����ZdS )$� )�absolute_import�division�print_functionN)�utilsc @ s( e Zd Zejdd� �Zejdd� �ZdS )�Modec C s dS )z@ A string naming this mode (e.g. "ECB", "CBC"). N� ��selfr r �N/usr/lib/python3/dist-packages/cryptography/hazmat/primitives/ciphers/modes.py�name s z Mode.namec C s dS )zq Checks that all the necessary invariants of this (mode, algorithm) combination are met. Nr �r � algorithmr r r �validate_for_algorithm s zMode.validate_for_algorithmN)�__name__� __module__� __qualname__�abc�abstractpropertyr �abstractmethodr r r r r r s r c @ s e Zd Zejdd� �ZdS )� ModeWithInitializationVectorc C s dS )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 r r r r r r s r c @ s e Zd Zejdd� �ZdS )� ModeWithTweakc C s dS )z@ The value of the tweak for this mode as bytes. Nr r r r r �tweak) s zModeWithTweak.tweakN)r r r r r r r r r r r ' s r c @ s e Zd Zejdd� �ZdS )� ModeWithNoncec C s dS )z@ The value of the nonce for this mode as bytes. Nr r r r r �nonce2 s zModeWithNonce.nonceN)r r r r r r r r r r r 0 s r c @ s e Zd Zejdd� �ZdS )�ModeWithAuthenticationTagc C s dS )zP The value of the tag supplied to the constructor of this mode. Nr r r r r �tag; s z ModeWithAuthenticationTag.tagN)r r r r r r r r r r r 9 s r c C s |j dkr |jdkr td��d S )N� ZAESz=Only 128, 192, and 256 bit keys are allowed for this AES mode)�key_sizer � ValueErrorr r r r �_check_aes_key_lengthB s �r c C s0 t | j�d |jkr,td�t | j�| j���d S )N� z Invalid IV size ({}) for {}.)�lenr � block_sizer �formatr r r r r �_check_iv_lengthI s �r% c C s t | |� t| |� d S �N)r r% r r r r �_check_iv_and_key_lengthP s r' c @ s& e Zd Zd Zdd� Ze�d�ZeZ dS )�CBCc C s t �d|� || _d S �Nr �r �_check_byteslike�_initialization_vector�r r r r r �__init__Z s z CBC.__init__r, N� r r r r r. r �read_only_propertyr r' r r r r r r( U s r( c @ s* e Zd Zd Zdd� Ze�d�Zdd� ZdS )�XTSc C s* t �d|� t|�dkr td��|| _d S )Nr � z!tweak must be 128-bits (16 bytes))r r+ r" r �_tweak)r r r r r r. g s z XTS.__init__r3 c C s |j dkrtd��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 q s �zXTS.validate_for_algorithmN) r r r r r. r r0 r r r r r r r1 b s r1 c @ s e Zd Zd ZeZdS )�ECBN)r r r r r r r r r r r4 y s r4 c @ s& e Zd Zd Zdd� Ze�d�ZeZ dS )�OFBc C s t �d|� || _d S r) r* r- r r r r. � s z OFB.__init__r, Nr/ r r r r r5 � s r5 c @ s& e Zd Zd Zdd� Ze�d�ZeZ dS )�CFBc C s t �d|� || _d S r) r* r- r r r r. � s z CFB.__init__r, Nr/ r r r r r6 � s r6 c @ s& e Zd Zd Zdd� Ze�d�ZeZ dS )�CFB8c C s t �d|� || _d S r) r* r- r r r r. � s z CFB8.__init__r, Nr/ r r r r r7 � s r7 c @ s* e Zd Zd Zdd� Ze�d�Zdd� ZdS )�CTRc C s t �d|� || _d S )Nr )r r+ �_nonce)r r r r r r. � s z CTR.__init__r9 c C s: t | |� t| j�d |jkr6td�t| j�| j���d S )Nr! z Invalid nonce size ({}) for {}.)r r" r r# r r$ r r r r r r � s �zCTR.validate_for_algorithmN) r r r r r. r r0 r r r r r r r8 � s r8 c @ s> e Zd Zd ZdZdZd dd�Ze�d�Z e�d�Z d d � Z dS ) �GCMl ��? l Nr2 c C st t �d|� t|�dkr td��|| _|d k rdt �d|� |dk rJtd��t|�|k rdtd�|���|| _|| _d S )Nr r z-initialization_vector must be at least 1 byter � zmin_tag_length must be >= 4z.Authentication tag must be {} bytes or longer.) r r+ r" r r, � _check_bytesr$ �_tagZ_min_tag_length)r r r Zmin_tag_lengthr r r r. � s ��z GCM.__init__r= r, c C s t | |� d S r& )r r r r r r � s zGCM.validate_for_algorithm)Nr2 ) r r r r Z_MAX_ENCRYPTED_BYTESZ_MAX_AAD_BYTESr. r r0 r r r r r r r r: � s r: ) Z __future__r r r r ZsixZ cryptographyr Z add_metaclass�ABCMeta�objectr r r r r r r% r' Zregister_interfacer( r1 r4 r5 r6 r7 r8 r: r r r r �<module> sP
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