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U �֫[�4 � @ s� d dl mZmZmZ d dlZd dlmZ d dlmZ d dl m Z m Z m Z G dd� dej e e�ZG dd � d ej e e�ZG d d � d ej e e�ZG d d � d ej e e�ZdS )� )�absolute_import�division�print_functionN)�encoding)� exceptions)�EncryptedMessage� StringFixer�randomc @ sF e Zd ZdZejjZej fdd�Z dd� Z dd� Z dd � Z d d � Zd S ) � PublicKeya= The public key counterpart to an Curve25519 :class:`nacl.public.PrivateKey` for encrypting messages. :param public_key: [:class:`bytes`] Encoded Curve25519 public key :param encoder: A class that is able to decode the `public_key` :cvar SIZE: The size that the public key is required to be c C sH |� |�| _t| jt�s"t�d��t| j�| jkrDt�d� | j���d S )Nz'PublicKey must be created from 32 bytesz-The public key must be exactly {0} bytes long) �decode� _public_key� isinstance�bytes�exc� TypeError�len�SIZE� ValueError�format)�self� public_key�encoder� r �-/usr/lib/python3/dist-packages/nacl/public.py�__init__$ s ��zPublicKey.__init__c C s | j S �N�r �r r r r � __bytes__0 s zPublicKey.__bytes__c C s t t| ��S r )�hashr r r r r �__hash__3 s zPublicKey.__hash__c C s& t || j�sdS tj�t| �t|��S �NF)r � __class__�nacl�bindingsZ sodium_memcmpr �r �otherr r r �__eq__6 s zPublicKey.__eq__c C s | |k S r r r% r r r �__ne__; s zPublicKey.__ne__N)�__name__� __module__� __qualname__�__doc__r# r$ Zcrypto_box_PUBLICKEYBYTESr r � RawEncoderr r r r' r( r r r r r s r c @ sl e Zd ZdZejjZejjZ e j fdd�Z e e j fdd��Zdd� Zdd � Zd d � Zd d � Ze dd� �ZdS )� PrivateKeya{ Private key for decrypting messages using the Curve25519 algorithm. .. warning:: This **must** be protected and remain secret. Anyone who knows the value of your :class:`~nacl.public.PrivateKey` can decrypt any message encrypted by the corresponding :class:`~nacl.public.PublicKey` :param private_key: The private key used to decrypt messages :param encoder: The encoder class used to decode the given keys :cvar SIZE: The size that the private key is required to be :cvar SEED_SIZE: The size that the seed used to generate the private key is required to be c C sT |� |�}t|t�r"t|�| jks4t�d�| j���tj � |�}|| _ t |�| _ d S )Nz?PrivateKey must be created from a {0} bytes long raw secret key)r r r r r r r r r# r$ Zcrypto_scalarmult_base� _private_keyr r )r � private_keyr Zraw_public_keyr r r r S s �� zPrivateKey.__init__c C sL |� |�}t|t�r"t|�| jks4t�d�| j���tj � |�\}}| |�S )ah Generate a PrivateKey using a deterministic construction starting from a caller-provided seed .. warning:: The seed **must** be high-entropy; therefore, its generator **must** be a cryptographic quality random function like, for example, :func:`~nacl.utils.random`. .. warning:: The seed **must** be protected and remain secret. Anyone who knows the seed is really in possession of the corresponding PrivateKey. :param seed: The seed used to generate the private key :rtype: :class:`~nacl.public.PrivateKey` z8PrivateKey seed must be a {0} bytes long binary sequence) r r r r � SEED_SIZEr r r r# r$ Zcrypto_box_seed_keypair)�clsZseedr Zraw_pkZraw_skr r r � from_seedb s �zPrivateKey.from_seedc C s | j S r )r/ r r r r r s zPrivateKey.__bytes__c C s t t| �t| j�f�S r )r �typer r r r r r r � s zPrivateKey.__hash__c C s t || j�sdS | j|jkS r! )r r" r r% r r r r' � s zPrivateKey.__eq__c C s | |k S r r r% r r r r( � s zPrivateKey.__ne__c C s | t tj�tjd�S )z~ Generates a random :class:`~nacl.public.PrivateKey` object :rtype: :class:`~nacl.public.PrivateKey` �r )r r. r r r- )r2 r r r �generate� s zPrivateKey.generateN)r) r* r+ r, r# r$ Zcrypto_box_SECRETKEYBYTESr Zcrypto_box_SEEDBYTESr1 r r- r � classmethodr3 r r r' r( r6 r r r r r. ? s r. c @ sb e Zd ZdZejjZdd� Zdd� Z e e j fdd��Z de j fd d �Zde j fd d �Zd d� ZdS )�Boxa/ The Box class boxes and unboxes messages between a pair of keys The ciphertexts generated by :class:`~nacl.public.Box` 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 private_key: :class:`~nacl.public.PrivateKey` used to encrypt and decrypt messages :param public_key: :class:`~nacl.public.PublicKey` used to encrypt and decrypt messages :cvar NONCE_SIZE: The size that the nonce is required to be. c C sV |rL|rLt |t�r t |t�s&t�d��tj�|jt j d�|jt j d��| _ nd | _ d S )Nz5Box must be created from a PrivateKey and a PublicKeyr5 ) r r. r r r r# r$ Zcrypto_box_beforenm�encoder r- � _shared_key)r r0 r r r r r � s � �z Box.__init__c C s | j S r �r: r r r r r � s z Box.__bytes__c C s | d d �}|� |�|_|S r )r r: )r2 Zencodedr Zboxr r r r � s z Box.decodeNc C sn |dkrt | j�}t|�| jkr0t�d| j ��tj�||| j�}|� |�}|� |�}t � |||� || ��S )a� 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. :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 r# r$ Zcrypto_box_afternmr: r9 r Z _from_parts)r � plaintext�noncer � ciphertextZ encoded_nonce�encoded_ciphertextr r r �encrypt� s$ �� �z Box.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_box_open_afternmr: )r r@ r? r r> r r r �decrypt� s ��z Box.decryptc C s | j S )a� Returns the Curve25519 shared secret, that can then be used as a key in other symmetric ciphers. .. warning:: It is **VITALLY** important that you use a nonce with your symmetric cipher. If you fail to do this, you compromise the privacy of the messages encrypted. Ensure that the key length of your cipher is 32 bytes. :rtype: [:class:`bytes`] r; r r r r � shared_key s zBox.shared_key)r) r* r+ r, r# r$ Zcrypto_box_NONCEBYTESr= r r r7 r r- r rB rC rD r r r r r8 � s % r8 c @ s< e Zd ZdZdd� Zdd� Zejfdd�Zejfdd �Z d S ) � SealedBoxak The SealedBox class boxes and unboxes messages addressed to a specified key-pair by using ephemeral sender's keypairs, whose private part will be discarded just after encrypting a single plaintext message. The ciphertexts generated by :class:`~nacl.public.SecretBox` include the public part of the ephemeral key before the :class:`~nacl.public.Box` ciphertext. :param public_key: :class:`~nacl.public.PublicKey` used to encrypt messages and derive nonces :param private_key: :class:`~nacl.public.PrivateKey` used to decrypt messages .. versionadded:: 1.2 c C s^ t |t�r"|jtjd�| _d | _n8t |t�rP|jtjd�| _|jjtjd�| _n t � d��d S )Nr5 z:SealedBox must be created from a PublicKey or a PrivateKey) r r r9 r r- r r/ r. r r r )r Z recipient_keyr r r r . s � �� zSealedBox.__init__c C s | j S r r r r r r r = s zSealedBox.__bytes__c C s t j�|| j�}|�|�}|S )ay Encrypts the plaintext message using a random-generated ephemeral keypair and returns a "composed ciphertext", containing both the public part of the keypair and the ciphertext proper, encoded with the encoder. The private part of the ephemeral key-pair will be scrubbed before returning the ciphertext, therefore, the sender will not be able to decrypt the generated ciphertext. :param plaintext: [:class:`bytes`] The plaintext message to encrypt :param encoder: The encoder to use to encode the ciphertext :return bytes: encoded ciphertext )r# r$ Zcrypto_box_sealr r9 )r r> r r@ rA r r r rB @ s � zSealedBox.encryptc C s" |� |�}tj�|| j| j�}|S )ar Decrypts the ciphertext using the ephemeral public key enclosed in the ciphertext and the SealedBox private key, returning the plaintext message. :param ciphertext: [:class:`bytes`] The encrypted message to decrypt :param encoder: The encoder used to decode the ciphertext. :return bytes: The original plaintext )r r# r$ Zcrypto_box_seal_openr r/ )r r@ r r> r r r rC Y s �zSealedBox.decryptN) r) r* r+ r, r r r r- rB rC r r r r rE s rE )Z __future__r r r Z nacl.bindingsr# r r r Z nacl.utilsr r r Z Encodable�objectr r. r8 rE r r r r �<module> s (X
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