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__init__.py 0000644 00000001207 15204267710 0006661 0 ustar 00 # This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function from cryptography.hazmat.primitives.ciphers.base import ( AEADCipherContext, AEADDecryptionContext, AEADEncryptionContext, BlockCipherAlgorithm, Cipher, CipherAlgorithm, CipherContext, ) __all__ = [ "Cipher", "CipherAlgorithm", "BlockCipherAlgorithm", "CipherContext", "AEADCipherContext", "AEADDecryptionContext", "AEADEncryptionContext", ] aead.py 0000644 00000013733 15204267710 0006023 0 ustar 00 # This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function import os from cryptography import exceptions, utils from cryptography.hazmat.backends.openssl import aead from cryptography.hazmat.backends.openssl.backend import backend class ChaCha20Poly1305(object): _MAX_SIZE = 2 ** 32 def __init__(self, key): if not backend.aead_cipher_supported(self): raise exceptions.UnsupportedAlgorithm( "ChaCha20Poly1305 is not supported by this version of OpenSSL", exceptions._Reasons.UNSUPPORTED_CIPHER, ) utils._check_byteslike("key", key) if len(key) != 32: raise ValueError("ChaCha20Poly1305 key must be 32 bytes.") self._key = key @classmethod def generate_key(cls): return os.urandom(32) def encrypt(self, nonce, data, associated_data): if associated_data is None: associated_data = b"" if len(data) > self._MAX_SIZE or len(associated_data) > self._MAX_SIZE: # This is OverflowError to match what cffi would raise raise OverflowError( "Data or associated data too long. Max 2**32 bytes" ) self._check_params(nonce, data, associated_data) return aead._encrypt(backend, self, nonce, data, associated_data, 16) def decrypt(self, nonce, data, associated_data): if associated_data is None: associated_data = b"" self._check_params(nonce, data, associated_data) return aead._decrypt(backend, self, nonce, data, associated_data, 16) def _check_params(self, nonce, data, associated_data): utils._check_byteslike("nonce", nonce) utils._check_bytes("data", data) utils._check_bytes("associated_data", associated_data) if len(nonce) != 12: raise ValueError("Nonce must be 12 bytes") class AESCCM(object): _MAX_SIZE = 2 ** 32 def __init__(self, key, tag_length=16): utils._check_byteslike("key", key) if len(key) not in (16, 24, 32): raise ValueError("AESCCM key must be 128, 192, or 256 bits.") self._key = key if not isinstance(tag_length, int): raise TypeError("tag_length must be an integer") if tag_length not in (4, 6, 8, 10, 12, 14, 16): raise ValueError("Invalid tag_length") self._tag_length = tag_length @classmethod def generate_key(cls, bit_length): if not isinstance(bit_length, int): raise TypeError("bit_length must be an integer") if bit_length not in (128, 192, 256): raise ValueError("bit_length must be 128, 192, or 256") return os.urandom(bit_length // 8) def encrypt(self, nonce, data, associated_data): if associated_data is None: associated_data = b"" if len(data) > self._MAX_SIZE or len(associated_data) > self._MAX_SIZE: # This is OverflowError to match what cffi would raise raise OverflowError( "Data or associated data too long. Max 2**32 bytes" ) self._check_params(nonce, data, associated_data) self._validate_lengths(nonce, len(data)) return aead._encrypt( backend, self, nonce, data, associated_data, self._tag_length ) def decrypt(self, nonce, data, associated_data): if associated_data is None: associated_data = b"" self._check_params(nonce, data, associated_data) return aead._decrypt( backend, self, nonce, data, associated_data, self._tag_length ) def _validate_lengths(self, nonce, data_len): # For information about computing this, see # https://tools.ietf.org/html/rfc3610#section-2.1 l_val = 15 - len(nonce) if 2 ** (8 * l_val) < data_len: raise ValueError("Data too long for nonce") def _check_params(self, nonce, data, associated_data): utils._check_byteslike("nonce", nonce) utils._check_bytes("data", data) utils._check_bytes("associated_data", associated_data) if not 7 <= len(nonce) <= 13: raise ValueError("Nonce must be between 7 and 13 bytes") class AESGCM(object): _MAX_SIZE = 2 ** 32 def __init__(self, key): utils._check_byteslike("key", key) if len(key) not in (16, 24, 32): raise ValueError("AESGCM key must be 128, 192, or 256 bits.") self._key = key @classmethod def generate_key(cls, bit_length): if not isinstance(bit_length, int): raise TypeError("bit_length must be an integer") if bit_length not in (128, 192, 256): raise ValueError("bit_length must be 128, 192, or 256") return os.urandom(bit_length // 8) def encrypt(self, nonce, data, associated_data): if associated_data is None: associated_data = b"" if len(data) > self._MAX_SIZE or len(associated_data) > self._MAX_SIZE: # This is OverflowError to match what cffi would raise raise OverflowError( "Data or associated data too long. Max 2**32 bytes" ) self._check_params(nonce, data, associated_data) return aead._encrypt(backend, self, nonce, data, associated_data, 16) def decrypt(self, nonce, data, associated_data): if associated_data is None: associated_data = b"" self._check_params(nonce, data, associated_data) return aead._decrypt(backend, self, nonce, data, associated_data, 16) def _check_params(self, nonce, data, associated_data): utils._check_byteslike("nonce", nonce) utils._check_bytes("data", data) utils._check_bytes("associated_data", associated_data) if len(nonce) == 0: raise ValueError("Nonce must be at least 1 byte") __pycache__/modes.cpython-36.pyc 0000644 00000015537 15204267710 0012530 0 ustar 00 3 l�_J � @ s� d dl mZmZmZ d dlZd dlZd dlmZ ejej �G dd� de ��Z ejej �G dd� de ��Z ejej �G dd � d e ��Z ejej �G d d � d e ��Zejej �G d d � d e ��Zdd� Zdd� Zdd� Zeje �eje �G dd� de ���Zeje �eje �G dd� de ���Zeje �G dd� de ��Zeje �eje �G dd� de ���Zeje �eje �G d d � d e ���Zeje �eje �G d d � d e ���Zeje �eje�G d d!� d!e ���Zeje �eje �eje�G d"d#� d#e ����ZdS )$� )�absolute_import�division�print_functionN)�utilsc @ s( e Zd Zejdd� �Zejdd� �ZdS )�Modec C s dS )z@ A string naming this mode (e.g. "ECB", "CBC"). 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l l )Nr+ ) r r r r Z_MAX_ENCRYPTED_BYTESZ_MAX_AAD_BYTESr( r r) r r r r r r r r4 � s r4 ) Z __future__r r r r ZsixZ cryptographyr Z add_metaclass�ABCMeta�objectr r r r r r r# r$ Zregister_interfacer% r* r. r/ r0 r1 r2 r4 r r r r �<module> sP __pycache__/algorithms.cpython-36.pyc 0000644 00000012476 15204267710 0013571 0 ustar 00 3 l�_� � @ sx d dl mZmZmZ d dlmZ d dlmZmZ d dl m Z dd� Z ej e�ej e�G dd� de ���Zej e�ej e�G d d � d e ���Zej e�ej e�G d d � d e ���Zej e�ej e�G d d� de ���Zej e�ej e�G dd� de ���Zej e�G dd� de ��Zej e�G dd� de ��Zej e�ej e�G dd� de ���Zej e�ej e �G dd� de ���ZdS )� )�absolute_import�division�print_function)�utils)�BlockCipherAlgorithm�CipherAlgorithm)� ModeWithNoncec C s< t jd|� t|�d | jkr8tdjt|�d | j���|S )N�key� z Invalid key size ({}) for {}.)r �_check_byteslike�len� key_sizes� ValueError�format�name)� algorithmr � r �"/usr/lib64/python3.6/algorithms.py�_verify_key_size s r c @ s8 e Zd Zd ZdZeddddg�Zdd� Zedd� �Z d S ) �AES� � � i c C s t | |�| _d S )N)r r )�selfr r r r �__init__% s z AES.__init__c C s t | j�d S )Nr )r r )r r r r �key_size( s z AES.key_sizeN) �__name__� __module__� __qualname__r � block_size� frozensetr r �propertyr r r r r r s r c @ s6 e Zd ZdZdZedddg�Zdd� Zedd� �Z d S ) �CamelliaZcamelliar r r c C s t | |�| _d S )N)r r )r r r r r r 4 s zCamellia.__init__c C s t | j�d S )Nr )r r )r r r r r 7 s zCamellia.key_sizeN) r r r r r r r r r! r r r r r r" - s r" c @ s6 e Zd ZdZdZedddg�Zdd� Zedd� �Z d S ) � TripleDESZ3DES�@ r r c C sF t |�dkr||| 7 }n t |�dkr6||d d� 7 }t| |�| _d S )Nr � )r r r )r r r r r r C s zTripleDES.__init__c C s t | j�d S )Nr )r r )r r r r r J s zTripleDES.key_sizeN) r r r r r r r r r! r r r r r r# < s r# c @ s8 e Zd Zd ZdZeeddd��Zdd� Ze dd� �Z d S ) �Blowfishr$ � i� r c C s t | |�| _d S )N)r r )r r r r r r V s zBlowfish.__init__c C s t | j�d S )Nr )r r )r r r r r Y s zBlowfish.key_sizeN) r r r r r r �ranger r r! r r r r r r& O s r& c @ s8 e Zd Zd ZdZeeddd��Zdd� Ze dd� �Z d S ) �CAST5r$ �( � r c C s t | |�| _d S )N)r r )r r r r r r e s zCAST5.__init__c C s t | j�d S )Nr )r r )r r r r r h s zCAST5.key_sizeN) r r r r r r r( r r r! r r r r r r) ^ s r) c @ s< e Zd ZdZedddddddd g�Zd d � Zed d � �ZdS )�ARC4ZRC4r* �8 r$ �P r � r r c C s t | |�| _d S )N)r r )r r r r r r r s z ARC4.__init__c C s t | j�d S )Nr )r r )r r r r r u s z ARC4.key_sizeN) r r r r r r r r! r r r r r r, m s r, c @ s2 e Zd Zd ZdZedg�Zdd� Zedd� �Z dS )�IDEAr$ r c C s t | |�| _d S )N)r r )r r r r r r � s z IDEA.__init__c C s t | j�d S )Nr )r r )r r r r r � s z IDEA.key_sizeN) r r r r r r r r r! r r r r r r0 z s r0 c @ s2 e Zd Zd ZdZedg�Zdd� Zedd� �Z dS )�SEEDr c C s t | |�| _d S )N)r r )r r r r r r � s z SEED.__init__c C s t | j�d S )Nr )r r )r r r r r � s z SEED.key_sizeN) r r r r r r r r r! r r r r r r1 � s r1 c @ s8 e Zd Zd Zedg�Zdd� Zejd�Z e dd� �Z dS )�ChaCha20r c C s6 t | |�| _tjd|� t|�dkr,td��|| _d S )N�noncer% z!nonce must be 128-bits (16 bytes))r r r r r r �_nonce)r r r3 r r r r � s zChaCha20.__init__r4 c C s t | j�d S )Nr )r r )r r r r r � s zChaCha20.key_sizeN) r r r r r r r r Zread_only_propertyr3 r! r r r r r r2 � s r2 N)Z __future__r r r Z cryptographyr Z&cryptography.hazmat.primitives.ciphersr r Z,cryptography.hazmat.primitives.ciphers.modesr r Zregister_interface�objectr r" r# r& r) r, r0 r1 r2 r r r r �<module> s: __pycache__/aead.cpython-36.pyc 0000644 00000012776 15204267710 0012315 0 ustar 00 3 l�_� � @ sx d dl mZmZmZ d dlZd dlmZmZ d dlm Z d dl m Z G dd� de �Z G dd � d e �ZG d d � d e �ZdS ) � )�absolute_import�division�print_functionN)� exceptions�utils)�aead)�backendc @ s< e Zd ZdZdd� Zedd� �Zdd� Zd d � Zd d � Z d S )�ChaCha20Poly1305� � c C sD t j| �stjdtjj��tjd|� t|�dkr:t d��|| _ d S )Nz<ChaCha20Poly1305 is not supported by this version of OpenSSL�keyr z&ChaCha20Poly1305 key must be 32 bytes.) r Zaead_cipher_supportedr ZUnsupportedAlgorithmZ_ReasonsZUNSUPPORTED_CIPHERr �_check_byteslike�len� ValueError�_key)�selfr � r � /usr/lib64/python3.6/aead.py�__init__ s zChaCha20Poly1305.__init__c C s t jd�S )Nr )�os�urandom)�clsr r r � generate_key s z ChaCha20Poly1305.generate_keyc C sR |d kr d}t |�| jks(t |�| jkr0td��| j|||� tjt| |||d�S )N� z1Data or associated data too long. Max 2**32 bytes� )r � _MAX_SIZE� OverflowError� _check_paramsr �_encryptr )r �nonce�data�associated_datar r r �encrypt" s zChaCha20Poly1305.encryptc C s. |d kr d}| j |||� tjt| |||d�S )Nr r )r r �_decryptr )r r r r! r r r �decrypt/ s zChaCha20Poly1305.decryptc C s< t jd|� t jd|� t jd|� t|�dkr8td��d S )Nr r r! � zNonce must be 12 bytes)r r � _check_bytesr r )r r r r! r r r r 6 s z ChaCha20Poly1305._check_paramsNl ) �__name__� __module__� __qualname__r r � classmethodr r" r$ r r r r r r s r c @ sF e Zd ZdZddd�Zedd� �Zdd � Zd d � Zd d � Z dd� Z dS )�AESCCMr r r c C sR t jd|� t|�dkr td��|| _t|t�s8td��|dkrHtd ��|| _d S )Nr r � r z)AESCCM key must be 128, 192, or 256 bits.z tag_length must be an integer� � � � r% � zInvalid tag_length)r r, r )r- r. r/ r0 r% r1 r ) r r r r r � isinstance�int� TypeError� _tag_length)r r Z tag_lengthr r r r A s zAESCCM.__init__c C s0 t |t�std��|dkr"td��tj|d �S )Nz bit_length must be an integer� � � z#bit_length must be 128, 192, or 256r/ )r6 r7 r8 )r2 r3 r4 r r r )r � bit_lengthr r r r O s zAESCCM.generate_keyc C sd |d kr d}t |�| jks(t |�| jkr0td��| j|||� | j|t |�� tjt| |||| j�S )Nr z1Data or associated data too long. Max 2**32 bytes) r r r r �_validate_lengthsr r r r5 )r r r r! r r r r" Y s zAESCCM.encryptc C s0 |d kr d}| j |||� tjt| |||| j�S )Nr )r r r# r r5 )r r r r! r r r r$ i s zAESCCM.decryptc C s( dt |� }dd| |k r$td��d S )N� r r/ zData too long for nonce)r r )r r Zdata_lenZl_valr r r r: r s zAESCCM._validate_lengthsc C sL t jd|� t jd|� t jd|� dt|� ko:dkn sHtd��d S )Nr r r! � � z$Nonce must be between 7 and 13 bytes)r r r& r r )r r r r! r r r r y s zAESCCM._check_paramsNl )r ) r' r( r) r r r* r r" r$ r: r r r r r r+ > s r+ c @ s< e Zd ZdZdd� Zedd� �Zdd� Zd d � Zd d � Z d S )�AESGCMr r c C s* t jd|� t|�dkr td��|| _d S )Nr r r, r z)AESGCM key must be 128, 192, or 256 bits.)r r, r )r r r r r )r r r r r r � s zAESGCM.__init__c C s0 t |t�std��|dkr"td��tj|d �S )Nz bit_length must be an integerr6 r7 r8 z#bit_length must be 128, 192, or 256r/ )r6 r7 r8 )r2 r3 r4 r r r )r r9 r r r r � s zAESGCM.generate_keyc C sR |d kr d}t |�| jks(t |�| jkr0td��| j|||� tjt| |||d�S )Nr z1Data or associated data too long. Max 2**32 bytesr )r r r r r r r )r r r r! r r r r" � s zAESGCM.encryptc C s. |d kr d}| j |||� tjt| |||d�S )Nr r )r r r# r )r r r r! r r r r$ � s zAESGCM.decryptc C s< t jd|� t jd|� t jd|� t|�dkr8td��d S )Nr r r! r z Nonce must be at least 1 byte)r r r& r r )r r r r! r r r r � s zAESGCM._check_paramsNl ) r' r( r) r r r* r r" r$ r r r r r r> � s r> )Z __future__r r r r Z cryptographyr r Z$cryptography.hazmat.backends.opensslr Z,cryptography.hazmat.backends.openssl.backendr �objectr r+ r> r r r r �<module> s 0C __pycache__/algorithms.cpython-36.opt-1.pyc 0000644 00000012476 15204267711 0014531 0 ustar 00 3 l�_� � @ sx d dl mZmZmZ d dlmZ d dlmZmZ d dl m Z dd� Z ej e�ej e�G dd� de ���Zej e�ej e�G d d � d e ���Zej e�ej e�G d d � d e ���Zej e�ej e�G d d� de ���Zej e�ej e�G dd� de ���Zej e�G dd� de ��Zej e�G dd� de ��Zej e�ej e�G dd� de ���Zej e�ej e �G dd� de ���ZdS )� )�absolute_import�division�print_function)�utils)�BlockCipherAlgorithm�CipherAlgorithm)� ModeWithNoncec C s< t jd|� t|�d | jkr8tdjt|�d | j���|S )N�key� z Invalid key size ({}) for {}.)r �_check_byteslike�len� key_sizes� ValueError�format�name)� algorithmr � r �"/usr/lib64/python3.6/algorithms.py�_verify_key_size s r c @ s8 e Zd Zd ZdZeddddg�Zdd� Zedd� �Z d S ) �AES� � � i c C s t | |�| _d S )N)r r )�selfr r r r �__init__% s z AES.__init__c C s t | j�d S )Nr )r r )r r r r �key_size( s z AES.key_sizeN) �__name__� __module__� __qualname__r � block_size� frozensetr r �propertyr r r r r r s r c @ s6 e Zd ZdZdZedddg�Zdd� Zedd� �Z d S ) �CamelliaZcamelliar r r c C s t | |�| _d S )N)r r )r r r r r r 4 s zCamellia.__init__c C s t | j�d S )Nr )r r )r r r r r 7 s zCamellia.key_sizeN) r r r r r r r r r! r r r r r r" - s r" c @ s6 e Zd ZdZdZedddg�Zdd� Zedd� �Z d S ) � TripleDESZ3DES�@ r r c C sF t |�dkr||| 7 }n t |�dkr6||d d� 7 }t| |�| _d S )Nr � )r r r )r r r r r r C s zTripleDES.__init__c C s t | j�d S )Nr )r r )r r r r r J s zTripleDES.key_sizeN) r r r r r r r r r! r r r r r r# < s r# c @ s8 e Zd Zd ZdZeeddd��Zdd� Ze dd� �Z d S ) �Blowfishr$ � i� r c C s t | |�| _d S )N)r r )r r r r r r V s zBlowfish.__init__c C s t | j�d S )Nr )r r )r r r r r Y s zBlowfish.key_sizeN) r r r r r r �ranger r r! r r r r r r& O s r& c @ s8 e Zd Zd ZdZeeddd��Zdd� Ze dd� �Z d S ) �CAST5r$ �( � r c C s t | |�| _d S )N)r r )r r r r r r e s zCAST5.__init__c C s t | j�d S )Nr )r r )r r r r r h s zCAST5.key_sizeN) r r r r r r r( r r r! r r r r r r) ^ s r) c @ s< e Zd ZdZedddddddd g�Zd d � Zed d � �ZdS )�ARC4ZRC4r* �8 r$ �P r � r r c C s t | |�| _d S )N)r r )r r r r r r r s z ARC4.__init__c C s t | j�d S )Nr )r r )r r r r r u s z ARC4.key_sizeN) r r r r r r r r! r r r r r r, m s r, c @ s2 e Zd Zd ZdZedg�Zdd� Zedd� �Z dS )�IDEAr$ r c C s t | |�| _d S )N)r r )r r r r r r � s z IDEA.__init__c C s t | j�d S )Nr )r r )r r r r r � s z IDEA.key_sizeN) r r r r r r r r r! r r r r r r0 z s r0 c @ s2 e Zd Zd ZdZedg�Zdd� Zedd� �Z dS )�SEEDr c C s t | |�| _d S )N)r r )r r r r r r � s z SEED.__init__c C s t | j�d S )Nr )r r )r r r r r � s z SEED.key_sizeN) r r r r r r r r r! r r r r r r1 � s r1 c @ s8 e Zd Zd Zedg�Zdd� Zejd�Z e dd� �Z dS )�ChaCha20r c C s6 t | |�| _tjd|� t|�dkr,td��|| _d S )N�noncer% z!nonce must be 128-bits (16 bytes))r r r r r r �_nonce)r r r3 r r r r � s zChaCha20.__init__r4 c C s t | j�d S )Nr )r r )r r r r r � s zChaCha20.key_sizeN) r r r r r r r r Zread_only_propertyr3 r! r r r r r r2 � s r2 N)Z __future__r r r Z cryptographyr Z&cryptography.hazmat.primitives.ciphersr r Z,cryptography.hazmat.primitives.ciphers.modesr r Zregister_interface�objectr r" r# r& r) r, r0 r1 r2 r r r r �<module> s: __pycache__/base.cpython-36.pyc 0000644 00000020466 15204267711 0012331 0 ustar 00 3 l�_U � @ s� d dl mZmZmZ d dlZd dlZd dlmZ d dlm Z m Z m Z m Z m Z d dlmZ d dlmZ d dlmZ ejej�G dd � d e��Zejej�G d d � d e��Zejej�G d d � d e��Zejej�G dd� de��Zejej�G dd� de��Zejej�G dd� de��Z G dd� de�Z ej e�G dd� de��Z ej e�ej e�ej e�G dd� de����Z ej e �G dd� de ��Z!dS ) � )�absolute_import�division�print_functionN)�utils)�AlreadyFinalized�AlreadyUpdated�NotYetFinalized�UnsupportedAlgorithm�_Reasons)� _get_backend)� CipherBackend)�modesc @ s( e Zd Zejdd� �Zejdd� �ZdS )�CipherAlgorithmc C s dS )zE A string naming this mode (e.g. "AES", "Camellia"). N� )�selfr r � /usr/lib64/python3.6/base.py�name s zCipherAlgorithm.namec C s dS )zW The size of the key being used as an integer in bits (e.g. 128, 256). Nr )r r r r �key_size s zCipherAlgorithm.key_sizeN)�__name__� __module__� __qualname__�abc�abstractpropertyr r r r r r r s r c @ s e Zd Zejdd� �ZdS )�BlockCipherAlgorithmc C s dS )zK The size of a block as an integer in bits (e.g. 64, 128). Nr )r r r r � block_size) s z BlockCipherAlgorithm.block_sizeN)r r r r r r r r r r r ' s r c @ s6 e Zd Zejdd� �Zejdd� �Zejdd� �ZdS )� CipherContextc C s dS )zk Processes the provided bytes through the cipher and returns the results as bytes. Nr )r �datar r r �update2 s zCipherContext.updatec C s dS )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_into9 s zCipherContext.update_intoc C s dS )zM Returns the results of processing the final block as bytes. Nr )r r r r �finalize@ s zCipherContext.finalizeN)r r r r �abstractmethodr r r r r r r r 0 s r c @ s e Zd Zejdd� �ZdS )�AEADCipherContextc C s dS )z3 Authenticates the provided bytes. Nr )r r r r r � authenticate_additional_dataI s z.AEADCipherContext.authenticate_additional_dataN)r r r r r! r# r r r r r" G s r" c @ s e Zd Zejdd� �ZdS )�AEADDecryptionContextc C s dS )z� Returns the results of processing the final block as bytes and allows delayed passing of the authentication tag. Nr )r �tagr r r �finalize_with_tagR s z'AEADDecryptionContext.finalize_with_tagN)r r r r r! r& r r r r r$ P s r$ c @ s e Zd Zejdd� �ZdS )�AEADEncryptionContextc C s dS )zb Returns tag bytes. This is only available after encryption is finalized. Nr )r r r r r% \ s zAEADEncryptionContext.tagN)r r r r r r% r r r r r' Z s r' c @ s. e Zd Zd dd�Zdd� Zdd� Zdd � ZdS ) �CipherNc C sX t |�}t|t�s tdtj��t|t�s0td��|d k rB|j|� || _ || _ || _ d S )Nz0Backend object does not implement CipherBackend.z&Expected interface of CipherAlgorithm.) r � isinstancer r r ZBACKEND_MISSING_INTERFACEr � TypeErrorZvalidate_for_algorithm� algorithm�mode�_backend)r r+ r, Zbackendr r r �__init__e s zCipher.__init__c C sB t | jtj�r"| jjd k r"td��| jj| j| j�}| j |dd�S )Nz0Authentication tag must be None when encrypting.T)�encrypt) r) r, r �ModeWithAuthenticationTagr% � ValueErrorr- Z create_symmetric_encryption_ctxr+ � _wrap_ctx)r �ctxr r r � encryptorw s zCipher.encryptorc C s | j j| j| j�}| j|dd�S )NF)r/ )r- Z create_symmetric_decryption_ctxr+ r, r2 )r r3 r r r � decryptor� s zCipher.decryptorc C s0 t | jtj�r$|rt|�S t|�S nt|�S d S )N)r) r, r r0 �_AEADEncryptionContext�_AEADCipherContext�_CipherContext)r r3 r/ r r r r2 � s zCipher._wrap_ctx)N)r r r r. r4 r5 r2 r r r r r( d s r( c @ s, e Zd Zdd� Zdd� Zdd� Zdd� Zd S ) r8 c C s || _ d S )N)�_ctx)r r3 r r r r. � s z_CipherContext.__init__c C s | j d krtd��| j j|�S )Nz Context was already finalized.)r9 r r )r r r r r r � s z_CipherContext.updatec C s | j d krtd��| j j||�S )Nz Context was already finalized.)r9 r r )r r r r r r r � s z_CipherContext.update_intoc C s& | j d krtd��| j j� }d | _ |S )Nz Context was already finalized.)r9 r r )r r r r r r � s z_CipherContext.finalizeN)r r r r. r r r r r r r r8 � s r8 c @ sD e Zd Zdd� Zdd� Zdd� Zdd� Zd d � Zd d � Zd d� Z dS )r7 c C s" || _ d| _d| _d | _d| _d S )Nr F)r9 �_bytes_processed�_aad_bytes_processed�_tag�_updated)r r3 r r r r. � s z_AEADCipherContext.__init__c C sV | j d krtd��d| _| j|7 _| j| j jjkrRtdj| j jj| j jj���d S )Nz Context was already finalized.Tz+{} has a maximum encrypted byte limit of {}) r9 r r= r: �_modeZ_MAX_ENCRYPTED_BYTESr1 �formatr )r Z data_sizer r r � _check_limit� s z _AEADCipherContext._check_limitc C s | j t|�� | jj|�S )N)r@ �lenr9 r )r r r r r r � s z_AEADCipherContext.updatec C s | j t|�� | jj||�S )N)r@ rA r9 r )r r r r r r r � s z _AEADCipherContext.update_intoc C s0 | j d krtd��| j j� }| j j| _d | _ |S )Nz Context was already finalized.)r9 r r r% r< )r r r r r r � s z_AEADCipherContext.finalizec C s2 | j d krtd��| j j|�}| j j| _d | _ |S )Nz Context was already finalized.)r9 r r& r% r< )r r% r r r r r& � s z$_AEADCipherContext.finalize_with_tagc C sn | j d krtd��| jr td��| jt|�7 _| j| j jjkr^tdj | j jj | j jj���| j j |� d S )Nz Context was already finalized.z'Update has been called on this context.z%{} has a maximum AAD byte limit of {}) r9 r r= r r; rA r> Z_MAX_AAD_BYTESr1 r? r r# )r r r r r r# � s z/_AEADCipherContext.authenticate_additional_dataN) r r r r. r@ r r r r& r# r r r r r7 � s r7 c @ s e Zd Zedd� �ZdS )r6 c C s | j d k rtd��| jS )Nz4You must finalize encryption before getting the tag.)r9 r r< )r r r r r% � s z_AEADEncryptionContext.tagN)r r r �propertyr% r r r r r6 � s r6 )"Z __future__r r r r ZsixZ cryptographyr Zcryptography.exceptionsr r r r r Z cryptography.hazmat.backendsr Z'cryptography.hazmat.backends.interfacesr Z&cryptography.hazmat.primitives.ciphersr Z add_metaclass�ABCMeta�objectr r r r" r$ r' r( Zregister_interfacer8 r7 r6 r r r r �<module> s8 . = __pycache__/modes.cpython-36.opt-1.pyc 0000644 00000015537 15204267711 0013470 0 ustar 00 3 l�_J � @ s� d dl mZmZmZ d dlZd dlZd dlmZ ejej �G dd� de ��Z ejej �G dd� de ��Z ejej �G dd � d e ��Z ejej �G d d � d e ��Zejej �G d d � d e ��Zdd� Zdd� Zdd� Zeje �eje �G dd� de ���Zeje �eje �G dd� de ���Zeje �G dd� de ��Zeje �eje �G dd� de ���Zeje �eje �G d d � d e ���Zeje �eje �G d d � d e ���Zeje �eje�G d d!� d!e ���Zeje �eje �eje�G d"d#� d#e ����ZdS )$� )�absolute_import�division�print_functionN)�utilsc @ s( e Zd Zejdd� �Zejdd� �ZdS )�Modec C s dS )z@ A string naming this mode (e.g. "ECB", "CBC"). N� )�selfr r � /usr/lib64/python3.6/modes.py�name s z Mode.namec C s dS )zq Checks that all the necessary invariants of this (mode, algorithm) combination are met. Nr )r � algorithmr r r �validate_for_algorithm s zMode.validate_for_algorithmN)�__name__� __module__� __qualname__�abc�abstractpropertyr �abstractmethodr r r r r r s r c @ s e Zd Zejdd� �ZdS )� ModeWithInitializationVectorc C s dS )zP The value of the initialization vector for this mode as bytes. Nr )r r r r �initialization_vector s z2ModeWithInitializationVector.initialization_vectorN)r r r r r r r r r r r s r c @ s e Zd Zejdd� �ZdS )� ModeWithTweakc C s dS )z@ The value of the tweak for this mode as bytes. Nr )r r r r �tweak) s zModeWithTweak.tweakN)r r r r r r r r r r r ' s r c @ s e Zd Zejdd� �ZdS )� ModeWithNoncec C s dS )z@ The value of the nonce for this mode as bytes. Nr )r r r r �nonce2 s zModeWithNonce.nonceN)r r r r r r r r r r r 0 s r c @ s e Zd Zejdd� �ZdS )�ModeWithAuthenticationTagc C s dS )zP The value of the tag supplied to the constructor of this mode. Nr )r r r r �tag; s z ModeWithAuthenticationTag.tagN)r r r r r r r r r r r 9 s r c C s |j dkr |jdkr td��d S )N� ZAESz=Only 128, 192, and 256 bit keys are allowed for this AES mode)�key_sizer � ValueError)r r r r r �_check_aes_key_lengthB s r c C s0 t | j�d |jkr,tdjt | j�| j���d S )N� z Invalid IV size ({}) for {}.)�lenr � block_sizer �formatr )r r r r r �_check_iv_lengthI s r# c C s t | |� t| |� d S )N)r r# )r r r r r �_check_iv_and_key_lengthR s r$ c @ s& e Zd Zd Zdd� Zejd�ZeZ dS )�CBCc C s t jd|� || _d S )Nr )r �_check_byteslike�_initialization_vector)r r r r r �__init__\ s z CBC.__init__r' N) r r r r r( r �read_only_propertyr r$ r r r r r r% W s r% c @ s* e Zd Zd Zdd� Zejd�Zdd� ZdS )�XTSc C s* t jd|� t|�dkr td��|| _d S )Nr � z!tweak must be 128-bits (16 bytes))r r& r r �_tweak)r r r r r r( i s z XTS.__init__r, c C s |j dkrtd��d S )Nr � 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 r r r s s zXTS.validate_for_algorithmN) r r r r r( r r) r r r r r r r* d s r* c @ s e Zd Zd ZeZdS )�ECBN)r r r r r r r r r r r. { s r. c @ s& e Zd Zd Zdd� Zejd�ZeZ dS )�OFBc C s t jd|� || _d S )Nr )r r& r' )r r r r r r( � s z OFB.__init__r' N) r r r r r( r r) r r$ r r r r r r/ � s r/ c @ s& e Zd Zd Zdd� Zejd�ZeZ dS )�CFBc C s t jd|� || _d S )Nr )r r& r' )r r r r r r( � s z CFB.__init__r' N) r r r r r( r r) r r$ r r r r r r0 � s r0 c @ s& e Zd Zd Zdd� Zejd�ZeZ dS )�CFB8c C s t jd|� || _d S )Nr )r r& r' )r r r r r r( � s z CFB8.__init__r' N) r r r r r( r r) r r$ r r r r r r1 � s r1 c @ s* e Zd Zd Zdd� Zejd�Zdd� ZdS )�CTRc C s t jd|� || _d S )Nr )r r& �_nonce)r r r r r r( � s z CTR.__init__r3 c C s: t | |� t| j�d |jkr6tdjt| j�| j���d S )Nr z Invalid nonce size ({}) for {}.)r r r r! r r" r )r r r r r r � s zCTR.validate_for_algorithmN) r r r r r( r r) r r r r r r r2 � s r2 c @ s> e Zd Zd ZdZdZddd �Zejd �Z ejd �Z d d � Z dS )�GCM� �' r r �@ Nr+ c C st t jd|� t|�dkr td��|| _|d k rdt jd|� |dk rJtd��t|�|k rdtdj|���|| _|| _d S )Nr r z-initialization_vector must be at least 1 byter � zmin_tag_length must be >= 4z.Authentication tag must be {} bytes or longer.) r r& r r r' � _check_bytesr" �_tagZ_min_tag_length)r r r Zmin_tag_lengthr r r r( � s z GCM.__init__r: r' c C s t | |� d S )N)r )r r r r r r � s zGCM.validate_for_algorithml l ��l ��? l l )Nr+ ) r r r r Z_MAX_ENCRYPTED_BYTESZ_MAX_AAD_BYTESr( r r) r r r r r r r r4 � s r4 ) Z __future__r r r r ZsixZ cryptographyr Z add_metaclass�ABCMeta�objectr r r r r r r# r$ Zregister_interfacer% r* r. r/ r0 r1 r2 r4 r r r r �<module> sP __pycache__/base.cpython-36.opt-1.pyc 0000644 00000020466 15204267711 0013270 0 ustar 00 3 l�_U � @ s� d dl mZmZmZ d dlZd dlZd dlmZ d dlm Z m Z m Z m Z m Z d dlmZ d dlmZ d dlmZ ejej�G dd � d e��Zejej�G d d � d e��Zejej�G d d � d e��Zejej�G dd� de��Zejej�G dd� de��Zejej�G dd� de��Z G dd� de�Z ej e�G dd� de��Z ej e�ej e�ej e�G dd� de����Z ej e �G dd� de ��Z!dS ) � )�absolute_import�division�print_functionN)�utils)�AlreadyFinalized�AlreadyUpdated�NotYetFinalized�UnsupportedAlgorithm�_Reasons)� _get_backend)� CipherBackend)�modesc @ s( e Zd Zejdd� �Zejdd� �ZdS )�CipherAlgorithmc C s dS )zE A string naming this mode (e.g. "AES", "Camellia"). N� )�selfr r � /usr/lib64/python3.6/base.py�name s zCipherAlgorithm.namec C s dS )zW The size of the key being used as an integer in bits (e.g. 128, 256). Nr )r r r r �key_size s zCipherAlgorithm.key_sizeN)�__name__� __module__� __qualname__�abc�abstractpropertyr r r r r r r s r c @ s e Zd Zejdd� �ZdS )�BlockCipherAlgorithmc C s dS )zK The size of a block as an integer in bits (e.g. 64, 128). Nr )r r r r � block_size) s z BlockCipherAlgorithm.block_sizeN)r r r r r r r r r r r ' s r c @ s6 e Zd Zejdd� �Zejdd� �Zejdd� �ZdS )� CipherContextc C s dS )zk Processes the provided bytes through the cipher and returns the results as bytes. Nr )r �datar r r �update2 s zCipherContext.updatec C s dS )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_into9 s zCipherContext.update_intoc C s dS )zM Returns the results of processing the final block as bytes. 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Max 2**32 bytesr )r r r r r r r )r r r r! r r r r" � s zAESGCM.encryptc C s. |d kr d}| j |||� tjt| |||d�S )Nr r )r r r# r )r r r r! r r r r$ � s zAESGCM.decryptc C s< t jd|� t jd|� t jd|� t|�dkr8td��d S )Nr r r! r z Nonce must be at least 1 byte)r r r& r r )r r r r! r r r r � s zAESGCM._check_paramsNl ) r' r( r) r r r* r r" r$ r r r r r r> � s r> )Z __future__r r r r Z cryptographyr r Z$cryptography.hazmat.backends.opensslr Z,cryptography.hazmat.backends.openssl.backendr �objectr r+ r> r r r r �<module> s 0C __pycache__/__init__.cpython-36.pyc 0000644 00000001024 15204267711 0013143 0 ustar 00 3 l�_� � @ sN d dl mZmZmZ d dlmZmZmZmZm Z m Z m Z ddddddd gZ d S ) � )�absolute_import�division�print_function)�AEADCipherContext�AEADDecryptionContext�AEADEncryptionContext�BlockCipherAlgorithm�Cipher�CipherAlgorithm� CipherContextr r r r r r r N) Z __future__r r r Z+cryptography.hazmat.primitives.ciphers.baser r r r r r r �__all__� r r � /usr/lib64/python3.6/__init__.py�<module> s $ __pycache__/__init__.cpython-36.opt-1.pyc 0000644 00000001024 15204267711 0014102 0 ustar 00 3 l�_� � @ sN d dl mZmZmZ d dlmZmZmZmZm Z m Z m Z ddddddd gZ d S ) � )�absolute_import�division�print_function)�AEADCipherContext�AEADDecryptionContext�AEADEncryptionContext�BlockCipherAlgorithm�Cipher�CipherAlgorithm� CipherContextr r r r r r r N) Z __future__r r r Z+cryptography.hazmat.primitives.ciphers.baser r r r r r r �__all__� r r � /usr/lib64/python3.6/__init__.py�<module> s $ algorithms.py 0000644 00000010201 15204267711 0007266 0 ustar 00 # This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function from cryptography import utils from cryptography.hazmat.primitives.ciphers import ( BlockCipherAlgorithm, CipherAlgorithm, ) from cryptography.hazmat.primitives.ciphers.modes import ModeWithNonce def _verify_key_size(algorithm, key): # Verify that the key is instance of bytes utils._check_byteslike("key", key) # Verify that the key size matches the expected key size if len(key) * 8 not in algorithm.key_sizes: raise ValueError( "Invalid key size ({}) for {}.".format( len(key) * 8, algorithm.name ) ) return key @utils.register_interface(BlockCipherAlgorithm) @utils.register_interface(CipherAlgorithm) class AES(object): name = "AES" block_size = 128 # 512 added to support AES-256-XTS, which uses 512-bit keys key_sizes = frozenset([128, 192, 256, 512]) def __init__(self, key): self.key = _verify_key_size(self, key) @property def key_size(self): return len(self.key) * 8 @utils.register_interface(BlockCipherAlgorithm) @utils.register_interface(CipherAlgorithm) class Camellia(object): name = "camellia" block_size = 128 key_sizes = frozenset([128, 192, 256]) def __init__(self, key): self.key = _verify_key_size(self, key) @property def key_size(self): return len(self.key) * 8 @utils.register_interface(BlockCipherAlgorithm) @utils.register_interface(CipherAlgorithm) class TripleDES(object): name = "3DES" block_size = 64 key_sizes = frozenset([64, 128, 192]) def __init__(self, key): if len(key) == 8: key += key + key elif len(key) == 16: key += key[:8] self.key = _verify_key_size(self, key) @property def key_size(self): return len(self.key) * 8 @utils.register_interface(BlockCipherAlgorithm) @utils.register_interface(CipherAlgorithm) class Blowfish(object): name = "Blowfish" block_size = 64 key_sizes = frozenset(range(32, 449, 8)) def __init__(self, key): self.key = _verify_key_size(self, key) @property def key_size(self): return len(self.key) * 8 @utils.register_interface(BlockCipherAlgorithm) @utils.register_interface(CipherAlgorithm) class CAST5(object): name = "CAST5" block_size = 64 key_sizes = frozenset(range(40, 129, 8)) def __init__(self, key): self.key = _verify_key_size(self, key) @property def key_size(self): return len(self.key) * 8 @utils.register_interface(CipherAlgorithm) class ARC4(object): name = "RC4" key_sizes = frozenset([40, 56, 64, 80, 128, 160, 192, 256]) def __init__(self, key): self.key = _verify_key_size(self, key) @property def key_size(self): return len(self.key) * 8 @utils.register_interface(CipherAlgorithm) class IDEA(object): name = "IDEA" block_size = 64 key_sizes = frozenset([128]) def __init__(self, key): self.key = _verify_key_size(self, key) @property def key_size(self): return len(self.key) * 8 @utils.register_interface(BlockCipherAlgorithm) @utils.register_interface(CipherAlgorithm) class SEED(object): name = "SEED" block_size = 128 key_sizes = frozenset([128]) def __init__(self, key): self.key = _verify_key_size(self, key) @property def key_size(self): return len(self.key) * 8 @utils.register_interface(CipherAlgorithm) @utils.register_interface(ModeWithNonce) class ChaCha20(object): name = "ChaCha20" key_sizes = frozenset([256]) def __init__(self, key, nonce): self.key = _verify_key_size(self, key) utils._check_byteslike("nonce", nonce) if len(nonce) != 16: raise ValueError("nonce must be 128-bits (16 bytes)") self._nonce = nonce nonce = utils.read_only_property("_nonce") @property def key_size(self): return len(self.key) * 8 modes.py 0000644 00000015112 15204267711 0006232 0 ustar 00 # This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function import abc import six from cryptography import utils @six.add_metaclass(abc.ABCMeta) class Mode(object): @abc.abstractproperty def name(self): """ A string naming this mode (e.g. "ECB", "CBC"). """ @abc.abstractmethod def validate_for_algorithm(self, algorithm): """ Checks that all the necessary invariants of this (mode, algorithm) combination are met. """ @six.add_metaclass(abc.ABCMeta) class ModeWithInitializationVector(object): @abc.abstractproperty def initialization_vector(self): """ The value of the initialization vector for this mode as bytes. """ @six.add_metaclass(abc.ABCMeta) class ModeWithTweak(object): @abc.abstractproperty def tweak(self): """ The value of the tweak for this mode as bytes. """ @six.add_metaclass(abc.ABCMeta) class ModeWithNonce(object): @abc.abstractproperty def nonce(self): """ The value of the nonce for this mode as bytes. """ @six.add_metaclass(abc.ABCMeta) class ModeWithAuthenticationTag(object): @abc.abstractproperty def tag(self): """ The value of the tag supplied to the constructor of this mode. """ def _check_aes_key_length(self, algorithm): if algorithm.key_size > 256 and algorithm.name == "AES": raise ValueError( "Only 128, 192, and 256 bit keys are allowed for this AES mode" ) def _check_iv_length(self, algorithm): if len(self.initialization_vector) * 8 != algorithm.block_size: raise ValueError( "Invalid IV size ({}) for {}.".format( len(self.initialization_vector), self.name ) ) def _check_iv_and_key_length(self, algorithm): _check_aes_key_length(self, algorithm) _check_iv_length(self, algorithm) @utils.register_interface(Mode) @utils.register_interface(ModeWithInitializationVector) class CBC(object): name = "CBC" def __init__(self, initialization_vector): utils._check_byteslike("initialization_vector", initialization_vector) self._initialization_vector = initialization_vector initialization_vector = utils.read_only_property("_initialization_vector") validate_for_algorithm = _check_iv_and_key_length @utils.register_interface(Mode) @utils.register_interface(ModeWithTweak) class XTS(object): name = "XTS" def __init__(self, tweak): utils._check_byteslike("tweak", tweak) if len(tweak) != 16: raise ValueError("tweak must be 128-bits (16 bytes)") self._tweak = tweak tweak = utils.read_only_property("_tweak") def validate_for_algorithm(self, algorithm): if algorithm.key_size not in (256, 512): raise ValueError( "The XTS specification requires a 256-bit key for AES-128-XTS" " and 512-bit key for AES-256-XTS" ) @utils.register_interface(Mode) class ECB(object): name = "ECB" validate_for_algorithm = _check_aes_key_length @utils.register_interface(Mode) @utils.register_interface(ModeWithInitializationVector) class OFB(object): name = "OFB" def __init__(self, initialization_vector): utils._check_byteslike("initialization_vector", initialization_vector) self._initialization_vector = initialization_vector initialization_vector = utils.read_only_property("_initialization_vector") validate_for_algorithm = _check_iv_and_key_length @utils.register_interface(Mode) @utils.register_interface(ModeWithInitializationVector) class CFB(object): name = "CFB" def __init__(self, initialization_vector): utils._check_byteslike("initialization_vector", initialization_vector) self._initialization_vector = initialization_vector initialization_vector = utils.read_only_property("_initialization_vector") validate_for_algorithm = _check_iv_and_key_length @utils.register_interface(Mode) @utils.register_interface(ModeWithInitializationVector) class CFB8(object): name = "CFB8" def __init__(self, initialization_vector): utils._check_byteslike("initialization_vector", initialization_vector) self._initialization_vector = initialization_vector initialization_vector = utils.read_only_property("_initialization_vector") validate_for_algorithm = _check_iv_and_key_length @utils.register_interface(Mode) @utils.register_interface(ModeWithNonce) class CTR(object): name = "CTR" def __init__(self, nonce): utils._check_byteslike("nonce", nonce) self._nonce = nonce nonce = utils.read_only_property("_nonce") def validate_for_algorithm(self, algorithm): _check_aes_key_length(self, algorithm) if len(self.nonce) * 8 != algorithm.block_size: raise ValueError( "Invalid nonce size ({}) for {}.".format( len(self.nonce), self.name ) ) @utils.register_interface(Mode) @utils.register_interface(ModeWithInitializationVector) @utils.register_interface(ModeWithAuthenticationTag) class GCM(object): name = "GCM" _MAX_ENCRYPTED_BYTES = (2 ** 39 - 256) // 8 _MAX_AAD_BYTES = (2 ** 64) // 8 def __init__(self, initialization_vector, tag=None, min_tag_length=16): # len(initialization_vector) must in [1, 2 ** 64), but it's impossible # to actually construct a bytes object that large, so we don't check # for it utils._check_byteslike("initialization_vector", initialization_vector) if len(initialization_vector) == 0: raise ValueError("initialization_vector must be at least 1 byte") self._initialization_vector = initialization_vector if tag is not None: utils._check_bytes("tag", tag) if min_tag_length < 4: raise ValueError("min_tag_length must be >= 4") if len(tag) < min_tag_length: raise ValueError( "Authentication tag must be {} bytes or longer.".format( min_tag_length ) ) self._tag = tag self._min_tag_length = min_tag_length tag = utils.read_only_property("_tag") initialization_vector = utils.read_only_property("_initialization_vector") def validate_for_algorithm(self, algorithm): _check_aes_key_length(self, algorithm) base.py 0000644 00000016125 15204267711 0006042 0 ustar 00 # This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function import abc import six from cryptography import utils from cryptography.exceptions import ( AlreadyFinalized, AlreadyUpdated, NotYetFinalized, UnsupportedAlgorithm, _Reasons, ) from cryptography.hazmat.backends import _get_backend from cryptography.hazmat.backends.interfaces import CipherBackend from cryptography.hazmat.primitives.ciphers import modes @six.add_metaclass(abc.ABCMeta) class CipherAlgorithm(object): @abc.abstractproperty def name(self): """ A string naming this mode (e.g. "AES", "Camellia"). """ @abc.abstractproperty def key_size(self): """ The size of the key being used as an integer in bits (e.g. 128, 256). """ @six.add_metaclass(abc.ABCMeta) class BlockCipherAlgorithm(object): @abc.abstractproperty def block_size(self): """ The size of a block as an integer in bits (e.g. 64, 128). """ @six.add_metaclass(abc.ABCMeta) class CipherContext(object): @abc.abstractmethod def update(self, data): """ Processes the provided bytes through the cipher and returns the results as bytes. """ @abc.abstractmethod def update_into(self, data, buf): """ Processes the provided bytes and writes the resulting data into the provided buffer. Returns the number of bytes written. """ @abc.abstractmethod def finalize(self): """ Returns the results of processing the final block as bytes. """ @six.add_metaclass(abc.ABCMeta) class AEADCipherContext(object): @abc.abstractmethod def authenticate_additional_data(self, data): """ Authenticates the provided bytes. """ @six.add_metaclass(abc.ABCMeta) class AEADDecryptionContext(object): @abc.abstractmethod def finalize_with_tag(self, tag): """ Returns the results of processing the final block as bytes and allows delayed passing of the authentication tag. """ @six.add_metaclass(abc.ABCMeta) class AEADEncryptionContext(object): @abc.abstractproperty def tag(self): """ Returns tag bytes. This is only available after encryption is finalized. """ class Cipher(object): def __init__(self, algorithm, mode, backend=None): backend = _get_backend(backend) if not isinstance(backend, CipherBackend): raise UnsupportedAlgorithm( "Backend object does not implement CipherBackend.", _Reasons.BACKEND_MISSING_INTERFACE, ) if not isinstance(algorithm, CipherAlgorithm): raise TypeError("Expected interface of CipherAlgorithm.") if mode is not None: mode.validate_for_algorithm(algorithm) self.algorithm = algorithm self.mode = mode self._backend = backend def encryptor(self): if isinstance(self.mode, modes.ModeWithAuthenticationTag): if self.mode.tag is not None: raise ValueError( "Authentication tag must be None when encrypting." ) ctx = self._backend.create_symmetric_encryption_ctx( self.algorithm, self.mode ) return self._wrap_ctx(ctx, encrypt=True) def decryptor(self): ctx = self._backend.create_symmetric_decryption_ctx( self.algorithm, self.mode ) return self._wrap_ctx(ctx, encrypt=False) def _wrap_ctx(self, ctx, encrypt): if isinstance(self.mode, modes.ModeWithAuthenticationTag): if encrypt: return _AEADEncryptionContext(ctx) else: return _AEADCipherContext(ctx) else: return _CipherContext(ctx) @utils.register_interface(CipherContext) class _CipherContext(object): def __init__(self, ctx): self._ctx = ctx def update(self, data): if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") return self._ctx.update(data) def update_into(self, data, buf): if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") return self._ctx.update_into(data, buf) def finalize(self): if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") data = self._ctx.finalize() self._ctx = None return data @utils.register_interface(AEADCipherContext) @utils.register_interface(CipherContext) @utils.register_interface(AEADDecryptionContext) class _AEADCipherContext(object): def __init__(self, ctx): self._ctx = ctx self._bytes_processed = 0 self._aad_bytes_processed = 0 self._tag = None self._updated = False def _check_limit(self, data_size): if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") self._updated = True self._bytes_processed += data_size if self._bytes_processed > self._ctx._mode._MAX_ENCRYPTED_BYTES: raise ValueError( "{} has a maximum encrypted byte limit of {}".format( self._ctx._mode.name, self._ctx._mode._MAX_ENCRYPTED_BYTES ) ) def update(self, data): self._check_limit(len(data)) return self._ctx.update(data) def update_into(self, data, buf): self._check_limit(len(data)) return self._ctx.update_into(data, buf) def finalize(self): if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") data = self._ctx.finalize() self._tag = self._ctx.tag self._ctx = None return data def finalize_with_tag(self, tag): if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") data = self._ctx.finalize_with_tag(tag) self._tag = self._ctx.tag self._ctx = None return data def authenticate_additional_data(self, data): if self._ctx is None: raise AlreadyFinalized("Context was already finalized.") if self._updated: raise AlreadyUpdated("Update has been called on this context.") self._aad_bytes_processed += len(data) if self._aad_bytes_processed > self._ctx._mode._MAX_AAD_BYTES: raise ValueError( "{} has a maximum AAD byte limit of {}".format( self._ctx._mode.name, self._ctx._mode._MAX_AAD_BYTES ) ) self._ctx.authenticate_additional_data(data) @utils.register_interface(AEADEncryptionContext) class _AEADEncryptionContext(_AEADCipherContext): @property def tag(self): if self._ctx is not None: raise NotYetFinalized( "You must finalize encryption before " "getting the tag." ) return self._tag
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