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U �֫[6 � @ sb d dl mZmZmZ d dlZd dlmZ d dlmZ d dl m Z m Z m Z G dd� dej e e�ZdS )� )�absolute_import�division�print_functionN)�encoding)� exceptions)�EncryptedMessage� StringFixer�randomc @ sf e Zd ZdZejjZejjZ ejj Z ejj Z ejfdd�Zdd� Zdejfdd�Zdejfd d �ZdS ) � SecretBoxa5 The SecretBox class encrypts and decrypts messages using the given secret key. The ciphertexts generated by :class:`~nacl.secret.Secretbox` include a 16 byte authenticator which is checked as part of the decryption. An invalid authenticator will cause the decrypt function to raise an exception. The authenticator is not a signature. Once you've decrypted the message you've demonstrated the ability to create arbitrary valid message, so messages you send are repudiable. For non-repudiable messages, sign them after encryption. :param key: The secret key used to encrypt and decrypt messages :param encoder: The encoder class used to decode the given key :cvar KEY_SIZE: The size that the key is required to be. :cvar NONCE_SIZE: The size that the nonce is required to be. :cvar MACBYTES: The size of the authentication MAC tag in bytes. :cvar MESSAGEBYTES_MAX: The maximum size of a message which can be safely encrypted with a single key/nonce pair. c C sF |� |�}t|t�s t�d��t|�| jkr<t�d| j ��|| _d S )Nz'SecretBox must be created from 32 bytesz%The key must be exactly %s bytes long) �decode� isinstance�bytes�exc� TypeError�len�KEY_SIZE� ValueError�_key)�self�key�encoder� r �-/usr/lib/python3/dist-packages/nacl/secret.py�__init__4 s ��zSecretBox.__init__c C s | j S )N)r )r r r r � __bytes__A s zSecretBox.__bytes__Nc C sn |dkrt | j�}t|�| jkr0t�d| j ��tj�||| j�}|� |�}|� |�}t � |||� || ��S )aL Encrypts the plaintext message using the given `nonce` (or generates one randomly if omitted) and returns the ciphertext encoded with the encoder. .. warning:: It is **VITALLY** important that the nonce is a nonce, i.e. it is a number used only once for any given key. If you fail to do this, you compromise the privacy of the messages encrypted. Give your nonces a different prefix, or have one side use an odd counter and one an even counter. Just make sure they are different. :param plaintext: [:class:`bytes`] The plaintext message to encrypt :param nonce: [:class:`bytes`] The nonce to use in the encryption :param encoder: The encoder to use to encode the ciphertext :rtype: [:class:`nacl.utils.EncryptedMessage`] N�'The nonce must be exactly %s bytes long) r � NONCE_SIZEr r r �nacl�bindingsZcrypto_secretboxr �encoder Z _from_parts)r � plaintext�noncer � ciphertextZ encoded_nonceZencoded_ciphertextr r r �encryptD s" � � �zSecretBox.encryptc C sb |� |�}|dkr.|d| j� }|| jd� }t|�| jkrLt�d| j ��tj�||| j�}|S )a� Decrypts the ciphertext using the `nonce` (explicitly, when passed as a parameter or implicitly, when omitted, as part of the ciphertext) and returns the plaintext message. :param ciphertext: [:class:`bytes`] The encrypted message to decrypt :param nonce: [:class:`bytes`] The nonce used when encrypting the ciphertext :param encoder: The encoder used to decode the ciphertext. :rtype: [:class:`bytes`] Nr ) r r r r r r r Zcrypto_secretbox_openr )r r" r! r r r r r �decrypti s � �zSecretBox.decrypt)�__name__� __module__� __qualname__�__doc__r r Zcrypto_secretbox_KEYBYTESr Zcrypto_secretbox_NONCEBYTESr Zcrypto_secretbox_MACBYTESZMACBYTESZ!crypto_secretbox_MESSAGEBYTES_MAXZMESSAGEBYTES_MAXr Z RawEncoderr r r# r$ r r r r r s %r )Z __future__r r r Z nacl.bindingsr r r r Z nacl.utilsr r r Z Encodable�objectr r r r r �<module> s
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