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o �)%a� � @ sB d dl Z d dlZd dlmZ d dlmZmZmZmZm Z d dl m Z d dl m Z d dlmZ d dlmZ G dd � d e jd �ZG d d � d e jd �ZG d d� de jd �ZG dd� de jd �ZG dd� de jd �ZG dd� de�Ze�e�G dd� de��Ze�e�e�e�e�e�G dd� de����Z e�e�G dd� de ��Z dS )� N)�utils)�AlreadyFinalized�AlreadyUpdated�NotYetFinalized�UnsupportedAlgorithm�_Reasons)� _get_backend)� CipherBackend)�CipherAlgorithm)�modesc @ � e Zd Zejdefdd��ZdS )�BlockCipherAlgorithm�returnc C � dS )zK The size of a block as an integer in bits (e.g. 64, 128). N� ��selfr r �M/usr/lib/python3/dist-packages/cryptography/hazmat/primitives/ciphers/base.py� block_size � z BlockCipherAlgorithm.block_sizeN)�__name__� __module__� __qualname__�abc�abstractproperty�intr r r r r r � r )� metaclassc @ sP e Zd Zejdedefdd��Zejdedefdd��Zejdefdd��Z d S ) � CipherContext�datar c C r )zk Processes the provided bytes through the cipher and returns the results as bytes. Nr �r r r r r �update r zCipherContext.updatec C r )z� Processes the provided bytes and writes the resulting data into the provided buffer. Returns the number of bytes written. Nr �r r �bufr r r � update_into' r zCipherContext.update_intoc C r )zM Returns the results of processing the final block as bytes. Nr r r r r �finalize. r zCipherContext.finalizeN) r r r r �abstractmethod�bytesr! r r$ r% r r r r r s r c @ s$ e Zd Zejdeddfdd��ZdS )�AEADCipherContextr r Nc C r )z3 Authenticates the provided bytes. Nr r r r r � authenticate_additional_data6 r z.AEADCipherContext.authenticate_additional_data)r r r r r& r' r) r r r r r( 5 � r( c @ s$ e Zd Zejdedefdd��ZdS )�AEADDecryptionContext�tagr c C r )z� Returns the results of processing the final block as bytes and allows delayed passing of the authentication tag. Nr )r r, r r r �finalize_with_tag> r z'AEADDecryptionContext.finalize_with_tagN)r r r r r& r' r- r r r r r+ = r* r+ c @ r )�AEADEncryptionContextr c C r )zb Returns tag bytes. This is only available after encryption is finalized. Nr r r r r r, G r zAEADEncryptionContext.tagN)r r r r r r' r, r r r r r. F r r. c @ sB e Zd Z d dedejej fdd�Zdd� Z dd � Z d d � Z dS ) �CipherN� algorithm�modec C sX t |�}t|t�stdtj��t|t�std��|d ur!|�|� || _ || _ || _ d S )Nz0Backend object does not implement CipherBackend.z&Expected interface of CipherAlgorithm.) r � isinstancer r r �BACKEND_MISSING_INTERFACEr � TypeError�validate_for_algorithmr0 r1 �_backend)r r0 r1 �backendr r r �__init__P s � zCipher.__init__c C sB t | jtj�r| jjd urtd��| j�| j| j�}| j |dd�S )Nz0Authentication tag must be None when encrypting.T��encrypt) r2 r1 r �ModeWithAuthenticationTagr, � ValueErrorr6 � create_symmetric_encryption_ctxr0 � _wrap_ctx�r �ctxr r r � encryptorg s ��zCipher.encryptorc C s | j �| j| j�}| j|dd�S )NFr9 )r6 � create_symmetric_decryption_ctxr0 r1 r> r? r r r � decryptorr s �zCipher.decryptorc C s* t | jtj�r|r t|�S t|�S t|�S �N)r2 r1 r r; �_AEADEncryptionContext�_AEADCipherContext�_CipherContext)r r@ r: r r r r> x s zCipher._wrap_ctxrD ) r r r r �typing�Optionalr �Moder8 rA rC r> r r r r r/ O s �� � r/ c @ sF e Zd Zdd� Zdedefdd�Zdedefdd�Zdefd d �Zd S ) rG c C s || _ d S rD )�_ctxr? r r r r8 � s z_CipherContext.__init__r r c C s | j d u r td��| j �|�S �N� Context was already finalized.)rK r r! r r r r r! � s z_CipherContext.updatec C s | j d u r td��| j �||�S rL )rK r r$ r" r r r r$ � s z_CipherContext.update_intoc C s& | j d u r td��| j �� }d | _ |S rL )rK r r% r r r r r% � s z_CipherContext.finalizeN) r r r r8 r' r! r r$ r% r r r r rG � s rG c @ sx e Zd Zdd� Zdefdd�Zdedefdd �Zdedefd d �Zdefd d �Z dedefdd�Z deddfdd�Z dS )rF c C s" || _ d| _d| _d | _d| _d S )Nr F)rK �_bytes_processed�_aad_bytes_processed�_tag�_updatedr? r r r r8 � s z_AEADCipherContext.__init__� data_sizec C sV | j d u r td��d| _| j|7 _| j| j jjkr)td�| j jj| j jj���d S )NrM Tz+{} has a maximum encrypted byte limit of {}) rK r rQ rN �_mode�_MAX_ENCRYPTED_BYTESr< �format�name)r rR r r r � _check_limit� s ���z _AEADCipherContext._check_limitr r c C s | � t|�� | j�|�S rD )rW �lenrK r! r r r r r! � s z_AEADCipherContext.updatec C s | � t|�� | j�||�S rD )rW rX rK r$ r" r r r r$ � s z _AEADCipherContext.update_intoc C s0 | j d u r td��| j �� }| j j| _d | _ |S rL )rK r r% r, rP r r r r r% � s z_AEADCipherContext.finalizer, c C s2 | j d u r td��| j �|�}| j j| _d | _ |S rL )rK r r- r, rP )r r, r r r r r- � s z$_AEADCipherContext.finalize_with_tagNc C sn | j d u r td��| jrtd��| jt|�7 _| j| j jjkr/td� | j jj | j jj���| j � |� d S )NrM z'Update has been called on this context.z%{} has a maximum AAD byte limit of {}) rK r rQ r rO rX rS �_MAX_AAD_BYTESr< rU rV r) r r r r r) � s ��z/_AEADCipherContext.authenticate_additional_data) r r r r8 r rW r' r! r$ r% r- r) r r r r rF � s rF c @ s e Zd Zedefdd��ZdS )rE r c C s& | j d ur td��| jd usJ �| jS )Nz4You must finalize encryption before getting the tag.)rK r rP r r r r r, � s �z_AEADEncryptionContext.tagN)r r r �propertyr' r, r r r r rE � s rE ) r rH � cryptographyr �cryptography.exceptionsr r r r r � cryptography.hazmat.backendsr �'cryptography.hazmat.backends.interfacesr �/cryptography.hazmat.primitives._cipheralgorithmr �&cryptography.hazmat.primitives.ciphersr �ABCMetar r r( r+ r. �objectr/ �register_interfacerG rF rE r r r r �<module> s, 3=
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