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o �)%a� � @ sJ d dl Z d dlZd dlmZ d dlmZ G dd� de jd�ZG dd� de jd�ZG d d � d e jd�Z G d d � d e jd�Z G d d� de jd�Z dd� Z dd� Z dedefdd�Zdd� ZG dd� dee�ZG dd � d ee �ZG d d � d e�ZG d d � d ee�ZG d!d"� d"ee�ZG d#d$� d$ee�ZG d%d&� d&ee �ZG d'd(� d(eee �ZdS ))� N)�utils)�CipherAlgorithmc @ s8 e Zd Zejdefdd��Zejdeddfdd��Z dS )�Mode�returnc C � 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 � z Mode.name� algorithmNc C r )zq Checks that all the necessary invariants of this (mode, algorithm) combination are met. Nr �r r r r r �validate_for_algorithm r zMode.validate_for_algorithm) �__name__� __module__� __qualname__�abc�abstractproperty�strr �abstractmethodr r r r r r r s r )� metaclassc @ � e Zd Zejdefdd��ZdS )� ModeWithInitializationVectorr c C r )zP The value of the initialization vector for this mode as bytes. Nr r r r r �initialization_vector r z2ModeWithInitializationVector.initialization_vectorN)r r r r r �bytesr r r r r r � r c @ r )� ModeWithTweakr c C r )z@ The value of the tweak for this mode as bytes. Nr r r r r �tweak% r zModeWithTweak.tweakN)r r r r r r r r r r r r $ r r c @ r )� ModeWithNoncer c C r )z@ The value of the nonce for this mode as bytes. Nr r r r r �nonce- r zModeWithNonce.nonceN)r r r r r r r r r r r r , r r c @ r )�ModeWithAuthenticationTagr c C r )zP The value of the tag supplied to the constructor of this mode. Nr r r r r �tag5 r z ModeWithAuthenticationTag.tagN)r r r r r r r" r r r r r! 4 r r! c C s$ |j dkr|jdkrtd��d S d S )N� �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 |jkrtd�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 |jkrtd�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 @ �, e Zd Zd Zdefdd�Ze�d�Ze Z dS )�CBCr c C � t �d|� || _d S �Nr �r �_check_byteslike�_initialization_vector�r r r r r �__init__[ � z CBC.__init__r6 N� r r r r r r8 r �read_only_propertyr r/ r r r r r r1 X � r1 c @ �6 e Zd Zd Zdefdd�Ze�d�Zde fdd�Z dS ) �XTSr c C s* t �d|� t|�dkrtd��|| _d S )Nr � z!tweak must be 128-bits (16 bytes))r r5 r) r& �_tweak)r r r r r r8 f s z XTS.__init__r@ r c C s |j dvr td��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 ��zXTS.validate_for_algorithmN) r r r r r r8 r r; r r r r r r r r> c s r> c @ s e Zd Zd ZeZdS )�ECBN)r r r r r' r r r r r rA x s rA c @ r0 )�OFBr c C r2 r3 r4 r7 r r r r8 � r9 z OFB.__init__r6 Nr: r r r r rB ~ r< rB c @ r0 )�CFBr c C r2 r3 r4 r7 r r r r8 � r9 z CFB.__init__r6 Nr: r r r r rC � r< rC c @ r0 )�CFB8r c C r2 r3 r4 r7 r r r r8 � r9 z CFB8.__init__r6 Nr: r r r r rD � r< rD c @ r= ) �CTRr c C r2 )Nr )r r5 �_nonce)r r r r r r8 � r9 z CTR.__init__rF r c C s t | |� t| j| j|� d S r. )r' r- r r r r r r r � s zCTR.validate_for_algorithmN) r r r r r r8 r r; r r r r r r r rE � s rE c @ s\ e Zd Zd ZdZdZ ddedeje de fdd �Z e � d �Z e � d �Zd efd d�ZdS )�GCMl ��? l Nr? r r" �min_tag_lengthc C s� t �d|� t|�dk st|�dkrtd��|| _|d ur8t �d|� |dk r+td��t|�|k r8td�|���|| _|| _d S ) Nr r( � zIinitialization_vector must be between 8 and 128 bytes (64 and 1024 bits).r" � zmin_tag_length must be >= 4z.Authentication tag must be {} bytes or longer.) r r5 r) r& r6 � _check_bytesr+ �_tag�_min_tag_length)r r r" rH r r r r8 � s$ � �� z GCM.__init__rL r6 r c C s t | |� d S r. )r' r r r r r � s zGCM.validate_for_algorithm)Nr? )r r r r �_MAX_ENCRYPTED_BYTES�_MAX_AAD_BYTESr �typing�Optional�intr8 r r; r" r r r r r r r rG � s ��� � rG )r rP � cryptographyr �/cryptography.hazmat.primitives._cipheralgorithmr �ABCMetar r r r r! r' r, r r r- r/ r1 r> rA rB rC rD rE rG r r r r �<module> s*
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