D7net
Home
Console
Upload
information
Create File
Create Folder
About
Tools
:
/
snap
/
core22
/
current
/
lib
/
python3
/
dist-packages
/
cryptography
/
__pycache__
/
Filename :
fernet.cpython-310.pyc
back
Copy
o �)%a� � @ s� d dl Z d dlZd dlZd dlZd dlZd dlZd dlmZ d dlm Z d dl m Z d dl m Z mZ d dlmZmZmZ d dlmZ G dd � d e�Zd ZG d d � d e�ZG d d� de�ZdS )� N)�utils)�InvalidSignature)� _get_backend)�hashes�padding)�Cipher� algorithms�modes)�HMACc @ s e Zd ZdS )� InvalidTokenN)�__name__� __module__� __qualname__� r r �5/usr/lib/python3/dist-packages/cryptography/fernet.pyr s r �< c @ s e Zd Zd!defdd�Zedefdd��Zdedefd d �Zded edefd d �Z ded ededefdd�Z d!dede j e defdd�Z deded edefdd�Zdedefdd�Zedede jeef fdd��Zdeddfdd �Zded ed e j e jeef defd d �ZdS )"�FernetN�keyc C sL t |�}t�|�}t|�dkrtd��|d d� | _|dd � | _|| _d S )N� z4Fernet key must be 32 url-safe base64-encoded bytes.� )r �base64�urlsafe_b64decode�len� ValueError� _signing_key�_encryption_key�_backend)�selfr �backendr r r �__init__ s � zFernet.__init__�returnc C s t �t�d��S )Nr )r �urlsafe_b64encode�os�urandom)�clsr r r � generate_key* s zFernet.generate_key�datac C � | � |tt�� ��S �N��encrypt_at_time�int�time)r r& r r r �encrypt. � zFernet.encrypt� current_timec C s t �d�}| �|||�S )Nr )r" r# �_encrypt_from_parts)r r& r/ �ivr r r r* 1 s zFernet.encrypt_at_timer1 c C s� t �d|� t�tjj��� }|�|�|� � }t t�| j �t � |�| j��� }|�|�|� � }dt�d|� | | }t| jt�� | jd�} | �|� | � � } t�|| �S )Nr& � ��>Q�r )r � _check_bytesr �PKCS7r �AES� block_size�padder�update�finalizer r r �CBCr � encryptor�struct�packr r r �SHA256r r! ) r r& r/ r1 r9 � padded_datar= � ciphertext� basic_parts�h�hmacr r r r0 5 s ��� zFernet._encrypt_from_parts�token�ttlc C s: t �|�\}}|d u rd }n|tt�� �f}| �|||�S r( )r �_get_unverified_token_datar+ r, � _decrypt_data)r rF rG � timestampr& � time_infor r r �decryptJ s zFernet.decryptc C s0 |d u rt d��t�|�\}}| �||||f�S )Nz6decrypt_at_time() can only be used with a non-None ttl)r r rH rI )r rF rG r/ rJ r& r r r �decrypt_at_timeR s �zFernet.decrypt_at_timec C s t �|�\}}| �|� |S r( )r rH �_verify_signature)r rF rJ r& r r r �extract_timestamp\ s zFernet.extract_timestampc C s~ t �d| � zt�| �}W n ttjfy t�w |r"|d dkr$t�zt� d|dd� �\}W ||fS tj y> t�w )NrF r � r3 � � ) r r5 r r � TypeError�binascii�Errorr r> �unpack�error)rF r& rJ r r r rH b s ���z!Fernet._get_unverified_token_datac C sT t | jt�� | jd�}|�|d d� � z |�|dd � � W d S ty) t�w )Nr4 ���) r r r r@ r r: �verifyr r )r r& rD r r r rN s s �zFernet._verify_signaturerJ rK c C s� |d ur|\}}|| |k rt �|t |k rt �| �|� |dd� }|dd� }tt�| j�t�|�| j �� � }|� |�} z| |� � 7 } W n t yO t �w t�tjj��� } | � | �} z | | � � 7 } W | S t yp t �w )NrR � rX )r �_MAX_CLOCK_SKEWrN r r r7 r r r< r � decryptorr: r; r r r6 r8 �unpadder) r r& rJ rK rG r/ r1 rB r\ �plaintext_paddedr] �unpaddedr r r rI { s8 �� � ��zFernet._decrypt_datar( )r r r �bytesr � classmethodr% r- r+ r* r0 �typing�OptionalrL rM rO � staticmethod�TuplerH rN rI r r r r r sL ��� � ��� � ����r c @ s� e Zd Zdeje fdd�Zdedefdd�Zdede defd d �Z dedefd d �Z ddedej e defdd�Z dede de defdd�Zd S )� MultiFernet�fernetsc C s t |�}|s td��|| _d S )Nz1MultiFernet requires at least one Fernet instance)�listr �_fernets)r rg r r r r � s � zMultiFernet.__init__�msgr c C r' r( r) )r rj r r r r- � r. zMultiFernet.encryptr/ c C s | j d �||�S )Nr )ri r* )r rj r/ r r r r* � s zMultiFernet.encrypt_at_timec C sb t �|�\}}| jD ]}z |�||d �}W n ty Y q w t�t�d�}| jd �|||�S )Nr r )r rH ri rI r r" r# r0 )r rj rJ r& �f�pr1 r r r �rotate� s � zMultiFernet.rotateNrG c C s4 | j D ]}z |�||�W S ty Y qw t�r( )ri rL r )r rj rG rk r r r rL � s �zMultiFernet.decryptc C s6 | j D ]}z |�|||�W S ty Y qw t�r( )ri rM r )r rj rG r/ rk r r r rM � s �zMultiFernet.decrypt_at_timer( )r r r rb �Iterabler r r` r- r+ r* rm rc rL rM r r r r rf � s ����rf )r rT r" r> r, rb � cryptographyr �cryptography.exceptionsr � cryptography.hazmat.backendsr � cryptography.hazmat.primitivesr r �&cryptography.hazmat.primitives.ciphersr r r �#cryptography.hazmat.primitives.hmacr � Exceptionr r[ �objectr rf r r r r �<module> s"