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a g�h� � @ s� d dl Z d dlZddlmZ ddlmZ ddlmZ ddlmZ ddlmZ ddl m Z G d d � d e �Z G d d � d e �Z G d d� de �ZG dd� de �ZdS )� N� )�constant_time_compare)�_base64_alphabet)� base64_decode)� base64_encode)� want_bytes)� BadSignaturec @ s e Zd ZdZdd� Zdd� ZdS )�SigningAlgorithmzgSubclasses must implement :meth:`get_signature` to provide signature generation functionality. c C s t � �dS )z2Returns the signature for the given key and value.N)�NotImplementedError��self�key�value� r ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/itsdangerous/signer.py� get_signature s z SigningAlgorithm.get_signaturec C s t || �||��S )zMVerifies the given signature matches the expected signature. )r r )r r r �sigr r r �verify_signature s z!SigningAlgorithm.verify_signatureN)�__name__� __module__� __qualname__�__doc__r r r r r r r s r c @ s e Zd ZdZdd� ZdS )� NoneAlgorithmz`Provides an algorithm that does not perform any signing and returns an empty signature. c C s dS )N� r r r r r r ! s zNoneAlgorithm.get_signatureN)r r r r r r r r r r s r c @ s, e Zd ZdZeej�Zddd�Zdd� Z dS )� HMACAlgorithmz*Provides signature generation using HMACs.Nc C s |d u r| j }|| _d S )N)�default_digest_method� digest_method)r r r r r �__init__- s zHMACAlgorithm.__init__c C s t j||| jd�}|�� S )N)�msg� digestmod)�hmac�newr �digest)r r r �macr r r r 2 s zHMACAlgorithm.get_signature)N) r r r r � staticmethod�hashlib�sha1r r r r r r r r % s r c @ sX e Zd ZdZeej�ZdZddd�Z dd� Z d d � Z d d � Z d d� Z dd� Zdd� ZdS )�Signera� This class can sign and unsign bytes, validating the signature provided. Salt can be used to namespace the hash, so that a signed string is only valid for a given namespace. Leaving this at the default value or re-using a salt value across different parts of your application where the same signed value in one part can mean something different in another part is a security risk. See :ref:`the-salt` for an example of what the salt is doing and how you can utilize it. .. versionadded:: 0.14 ``key_derivation`` and ``digest_method`` were added as arguments to the class constructor. .. versionadded:: 0.18 ``algorithm`` was added as an argument to the class constructor. � django-concatN�.c C s| t |�| _t |�| _| jtv r&td��|d u r2dn|| _|d u rF| j}|| _|d u rZ| j}|| _ |d u rrt | j �}|| _ d S )Nz�The given separator cannot be used because it may be contained in the signature itself. Alphanumeric characters and `-_=` must not be used.zitsdangerous.Signer) r � secret_key�sepr � ValueError�salt�default_key_derivation�key_derivationr r r � algorithm)r r* r- r+ r/ r r0 r r r r [ s � zSigner.__init__c C s� t | j�}| jdkr(| �|| j ��� S | jdkrJ| �|d | j ��� S | jdkrxtj| j| jd�}|�|� |�� S | jdkr�| jS t d��dS ) a+ This method is called to derive the key. The default key derivation choices can be overridden here. Key derivation is not intended to be used as a security method to make a complex key out of a short password. Instead you should use large random secret keys. �concatr( s signerr )r �nonez Unknown key derivation methodN) r r- r/ r r* r" r r! �update� TypeError)r r- r# r r r � derive_keyw s zSigner.derive_keyc C s& t |�}| �� }| j�||�}t|�S )z*Returns the signature for the given value.)r r5 r0 r r )r r r r r r r r � s zSigner.get_signaturec C s t |�t | j� | �|� S )zSigns the given string.)r r+ r )r r r r r �sign� s z Signer.signc C s: | � � }z t|�}W n ty( Y dS 0 | j�|||�S )z+Verifies the signature for the given value.F)r5 r � Exceptionr0 r )r r r r r r r r � s zSigner.verify_signaturec C s\ t |�}t | j�}||vr(td| j ��|�|d�\}}| �||�rH|S td| |d��dS )zUnsigns the given string.zNo %r found in valuer zSignature %r does not match)�payloadN)r r+ r �rsplitr )r � signed_valuer+ r r r r r �unsign� s z Signer.unsignc C s* z| � |� W dS ty$ Y dS 0 dS )znOnly validates the given signed value. Returns ``True`` if the signature exists and is valid. TFN)r; r )r r: r r r �validate� s zSigner.validate)Nr) NNN)r r r r r$ r% r& r r. r r5 r r6 r r; r< r r r r r' 7 s � r' )r% r �_compatr �encodingr r r r �excr �objectr r r r' r r r r �<module> s
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