Dashboard
PHP:
8.1.34
OS:
Linux
User:
uid288609
/
/
usr
/
lib
/
python3
/
dist-packages
/
cryptography
/
hazmat
/
primitives
/
kdf
/
__pycache__
📤 Upload
📝 New File
📁 New Folder
Close
Editing: hkdf.cpython-39.pyc
a � ` � @ s� d dl mZmZmZ d dlZd dlmZ d dlmZm Z m Z m Z d dl m Z d dlmZ d dlmZmZ d dlmZ e�e�G d d � d e��Ze�e�G d d � d e��ZdS ) � )�absolute_import�division�print_functionN)�utils)�AlreadyFinalized� InvalidKey�UnsupportedAlgorithm�_Reasons)� _get_backend)� HMACBackend)� constant_time�hmac)�KeyDerivationFunctionc @ s. e Zd Zd dd�Zdd� Zdd� Zdd � ZdS ) �HKDFNc C sh t |�}t|t�s tdtj��|| _|d u r:d| jj }n t� d|� || _ || _ t | j|||�| _ d S )N�.Backend object does not implement HMACBackend.� �salt)r � isinstancer r r �BACKEND_MISSING_INTERFACE� _algorithm� digest_sizer � _check_bytes�_salt�_backend� HKDFExpand� _hkdf_expand)�self� algorithm�lengthr �info�backend� r! �I/usr/lib/python3/dist-packages/cryptography/hazmat/primitives/kdf/hkdf.py�__init__ s � z HKDF.__init__c C s( t j| j| j| jd�}|�|� |�� S )N�r )r �HMACr r r �update�finalize)r � key_material�hr! r! r" �_extract- s z HKDF._extractc C s t �d|� | j�| �|��S )Nr( )r �_check_bytesliker �deriver* �r r( r! r! r" r, 2 s z HKDF.derivec C s t �| �|�|�st�d S �N�r Zbytes_eqr, r �r r( Z expected_keyr! r! r" �verify6 s z HKDF.verify)N)�__name__� __module__� __qualname__r# r* r, r1 r! r! r! r" r s r c @ s. e Zd Zd dd�Zdd� Zdd� Zdd � ZdS ) r Nc C sz t |�}t|t�s tdtj��|| _|| _d|j }||krJt d� |���|| _ |d u r^d}n t � d|� || _d| _d S )Nr � z*Can not derive keys larger than {} octets.� r F)r r r r r r r r r � ValueError�format�_lengthr r �_info�_used)r r r r r Z max_lengthr! r! r" r# = s& � � zHKDFExpand.__init__c C s� dg}d}| j jt|�d | jk rztj|| j | jd�}|�|d � |�| j� |�t � |�� |� |� � � |d7 }q d� |�d | j� S )Nr6 � r$ ���)r r �lenr9 r r% r r& r: �sixZint2byte�appendr' �join)r r( �outputZcounterr) r! r! r" �_expand[ s zHKDFExpand._expandc C s& t �d|� | jrt�d| _| �|�S )Nr( T)r r+ r; r rC r- r! r! r" r, i s zHKDFExpand.derivec C s t �| �|�|�st�d S r. r/ r0 r! r! r" r1 q s zHKDFExpand.verify)N)r2 r3 r4 r# rC r, r1 r! r! r! r" r ; s r )Z __future__r r r r? Z cryptographyr Zcryptography.exceptionsr r r r Z cryptography.hazmat.backendsr Z'cryptography.hazmat.backends.interfacesr Z cryptography.hazmat.primitivesr r Z"cryptography.hazmat.primitives.kdfr Zregister_interface�objectr r r! r! r! r" �<module> s $
Save
Cancel