관리-도구
편집 파일: modes.cpython-39.pyc
a �a � @ s^ d dl Z d dlZd dlmZ d dlmZmZ d dlmZm Z G dd� de j d�Z G dd � d e j d�Z G d d � d e j d�Z G d d � d e j d�ZG dd� de j d�Zdd� Zdd� Zeedd�dd�Zdd� ZG dd� de e �ZG dd � d e e �ZG d d � d e �ZG d d � d e e �ZG d!d"� d"e e �ZG d#d$� d$e e �ZG d%d&� d&e e�Z G d'd(� d(e e e�Z dS ))� N)�utils)�UnsupportedAlgorithm�_Reasons)�BlockCipherAlgorithm�CipherAlgorithmc @ s6 e Zd Zejed�dd��Zejedd�dd��Z dS )�Mode��returnc C s dS )z@ A string naming this mode (e.g. "ECB", "CBC"). N� ��selfr r �R/usr/lib64/python3.9/site-packages/cryptography/hazmat/primitives/ciphers/modes.py�name s z Mode.nameN�� algorithmr c C s dS )zq Checks that all the necessary invariants of this (mode, algorithm) combination are met. Nr �r r r r r �validate_for_algorithm s zMode.validate_for_algorithm) �__name__� __module__� __qualname__�abc�abstractproperty�strr �abstractmethodr r r r r r r s r )� metaclassc @ s e Zd Zejed�dd��ZdS )� ModeWithInitializationVectorr c 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 �bytesr r r r r r s r c @ s e Zd Zejed�dd��ZdS )� ModeWithTweakr c 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 r ( s r c @ s e Zd Zejed�dd��ZdS )� ModeWithNoncer c C s dS )z@ The value of the nonce for this mode as bytes. Nr r r r r �nonce1 s zModeWithNonce.nonceN)r r r r r r r! r r r r r 0 s r c @ s& e Zd Zejeje d�dd��ZdS )�ModeWithAuthenticationTagr c C s dS )zP The value of the tag supplied to the constructor of this mode. Nr r r r r �tag9 s z ModeWithAuthenticationTag.tagN) r r r r r �typing�Optionalr r# r r r r r" 8 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_length@ 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_lengthG s ��r. )r! r r c C s* t | �d |jkr&td�t | �|���d S )Nr* z Invalid nonce size ({}) for {}.)r+ r, r( r- )r! r r r r r �_check_nonce_lengthP s �r/ c C s t | |� t| |� d S �N)r) r. r r r r �_check_iv_and_key_lengthW s r1 c @ s4 e Zd Zd Zed�dd�Zeed�dd��ZeZ dS )�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__r c C s | j S r0 �r7 r r r r r c s zCBC.initialization_vectorN� r r r r r r9 �propertyr r1 r r r r r r2 \ s r2 c @ s@ e Zd Zd Zed�dd�Zeed�dd��Zedd�d d �Z dS ) �XTS)r c C s* t �d|� t|�dkr td��|| _d S )Nr � z!tweak must be 128-bits (16 bytes))r r6 r+ r( �_tweak)r r r r r r9 m s z XTS.__init__r c C s | j S r0 )r? r r r r r u s z XTS.tweakNr c C s |j dvrtd��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 y s �zXTS.validate_for_algorithm) r r r r r r9 r< r r r r r r r r= j s r= c @ s e Zd Zd ZeZdS )�ECBN)r r r r r) r r r r r r@ � s r@ c @ s4 e Zd Zd Zed�dd�Zeed�dd��ZeZ dS )�OFBr3 c C s t �d|� || _d S r4 r5 r8 r r r r9 � s z OFB.__init__r c C s | j S r0 r: r r r r r � s zOFB.initialization_vectorNr; r r r r rA � s rA c @ s4 e Zd Zd Zed�dd�Zeed�dd��ZeZ dS )�CFBr3 c C s t �d|� || _d S r4 r5 r8 r r r r9 � s z CFB.__init__r c C s | j S r0 r: r r r r r � s zCFB.initialization_vectorNr; r r r r rB � s rB c @ s4 e Zd Zd Zed�dd�Zeed�dd��ZeZ dS )�CFB8r3 c C s t �d|� || _d S r4 r5 r8 r r r r9 � s z CFB8.__init__r c C s | j S r0 r: r r r r r � s zCFB8.initialization_vectorNr; r r r r rC � s rC c @ s@ e Zd Zd Zed�dd�Zeed�dd��Zedd�d d �Z dS ) �CTR)r! c C s t �d|� || _d S )Nr! )r r6 �_nonce)r r! r r r r9 � s z CTR.__init__r c C s | j S r0 )rE r r r r r! � s z CTR.nonceNr c C s t | |� t| j| j|� d S r0 )r) r/ r! r r r r r r � s zCTR.validate_for_algorithm) r r r r r r9 r< r! r r r r r r rD � s rD c @ sl e Zd Zd ZdZdZdeeje e d�dd�Z e eje d�d d ��Z e ed�d d ��Z edd �dd�ZdS )�GCMl ��? l Nr> )r r# �min_tag_lengthc C s� t �d|� t|�dk s$t|�dkr,td��|| _|d urpt �d|� |dk rVtd��t|�|k rptd�|���|| _|| _d S ) Nr r* � zIinitialization_vector must be between 8 and 128 bytes (64 and 1024 bits).r# � zmin_tag_length must be >= 4z.Authentication tag must be {} bytes or longer.) r r6 r+ r( r7 � _check_bytesr- �_tagZ_min_tag_length)r r r# rG r r r r9 � s$ � ��z GCM.__init__r c C s | j S r0 )rK r r r r r# � s zGCM.tagc C s | j S r0 r: r r r r r � s zGCM.initialization_vectorr c C sT t | |� t|t�s tdtj��|jd }| jd urPt| j�|krPt d� |���d S )Nz%GCM requires a block cipher algorithmr* z0Authentication tag cannot be more than {} bytes.) r) � isinstancer r r ZUNSUPPORTED_CIPHERr, rK r+ r( r- )r r Zblock_size_bytesr r r r � s � ��zGCM.validate_for_algorithm)Nr> )r r r r Z_MAX_ENCRYPTED_BYTESZ_MAX_AAD_BYTESr r$ r% �intr9 r< r# r r r r r r r rF � s �� rF ) r r$ Z cryptographyr Zcryptography.exceptionsr r Z/cryptography.hazmat.primitives._cipheralgorithmr r �ABCMetar r r r r" r) r. r r r/ r1 r2 r= r@ rA rB rC rD rF r r r r �<module> s*