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o ��a�9 � @ s� d dl mZmZmZmZmZ d dlZd dlmZ d dlm Z d dl m Z d dl mZmZmZ G dd� deje�ZG d d � d eje�Zed d d �ZG dd � d eje�Zedee�ZG dd� dee eje�ZdS )� )�ClassVar�Generic�Optional�Type�TypeVarN)�encoding)� exceptions)�Encoder)�EncryptedMessage� StringFixer�randomc @ s� e Zd ZU dZejjZee e d< e j fde de jfdd�Zde fdd �Zde fd d �Zd edefd d�Zd edefdd�ZdS )� 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 �SIZE� public_key�encoderc C sH |� |�| _t| jt�st�d��t| j�| jkr"t�d� | j���d S )Nz'PublicKey must be created from 32 bytesz,The public key must be exactly {} bytes long) �decode� _public_key� isinstance�bytes�exc� TypeError�lenr � ValueError�format)�selfr r � r �-/usr/lib/python3/dist-packages/nacl/public.py�__init__$ s ���zPublicKey.__init__�returnc C � | j S �N�r �r r r r � __bytes__4 � zPublicKey.__bytes__c C s t t| ��S r )�hashr r" r r r �__hash__7 s zPublicKey.__hash__�otherc C s& t || j�sdS tj�t| �t|��S �NF)r � __class__�nacl�bindingsZ sodium_memcmpr �r r' r r r �__eq__: s zPublicKey.__eq__c C � | |k S r r r, r r r �__ne__? � zPublicKey.__ne__N)�__name__� __module__� __qualname__�__doc__r* r+ Zcrypto_box_PUBLICKEYBYTESr r �int�__annotations__r � RawEncoderr r r r# r& �object�boolr- r/ r r r r r s �� �r c @ s� e Zd ZU dZejjZee e d< ejj Z ee e d< e jfdede jfdd�Zee jfdede jd d fd d ��Zd efd d �Zd e fdd�Zded efdd�Zded efdd�Zeddd��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 r � SEED_SIZE� private_keyr c C sT |� |�}t|t�rt|�| jkst�d�| j���tj � |�}|| _ t |�| _ d S )Nz>PrivateKey must be created from a {} bytes long raw secret key)r r r r r r r r r* r+ Zcrypto_scalarmult_base� _private_keyr r )r r< r Zraw_public_keyr r r r W s � �� zPrivateKey.__init__�seedr c C sL |� |�}t|t�rt|�| jkst�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` z7PrivateKey seed must be a {} bytes long binary sequence) r r r r r; r r r r* r+ Zcrypto_box_seed_keypair)�clsr> r Zraw_pkZraw_skr r r � from_seedn s �zPrivateKey.from_seedc C r r )r= r" r r r r# � r$ zPrivateKey.__bytes__c C s t t| �t| j�f�S r )r% �typer r r" r r r r& � s zPrivateKey.__hash__r' c C s t || j�sdS | j|jkS r( )r r) r r, r r r r- � s zPrivateKey.__eq__c C r. r r r, r r r r/ � r0 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 r7 )r? r r r �generate� s zPrivateKey.generateN)r r: )r1 r2 r3 r4 r* r+ Zcrypto_box_SECRETKEYBYTESr r r5 r6 Zcrypto_box_SEEDBYTESr; r r7 r r r � classmethodr@ r# r& r8 r9 r- r/ rC r r r r r: C s2 �� ���� �#r: �_Box�Box)Zboundc @ s� e Zd ZU dZejjZee e d< e e d< de de fdd�Zde fd d �Zeejfd ee d e d edefdd��Zdejfde dee d ejdefdd�Zdejfde dee d ejde fdd�Zde fdd�ZdS )rF a/ 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. � NONCE_SIZE� _shared_keyr< r c C sF t |t�r t |t�st�d��tj�|jt j d�|jt j d��| _ d S )Nz5Box must be created from a PrivateKey and a PublicKeyrB ) r r: r r r r* r+ Zcrypto_box_beforenm�encoder r7 rH )r r< r r r r r � s �� �z Box.__init__r c C r r �rH r" r r r r# � r$ z Box.__bytes__r? �encodedr c C s | � | �}|�|�|_|S )z[ Alternative constructor. Creates a Box from an existing Box's shared key. )�__new__r rH )r? rK r Zboxr r r r � s z Box.decodeN� plaintext�noncec C sn |du r t | j�}t|�| jkrt�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 rG r r r r* r+ Zcrypto_box_afternmrH rI r Z _from_parts)r rM rN r � ciphertextZ encoded_nonce�encoded_ciphertextr r r �encrypt� s$ �� �z Box.encryptrP c C sb |� |�}|du r|d| j� }|| jd� }t|�| jkr&t�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`] NrO ) r rG r r r r* r+ Zcrypto_box_open_afternmrH )r rP rN r rM r r r �decrypt s ��z Box.decryptc C r )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`] rJ r" r r r � shared_key3 s zBox.shared_key) r1 r2 r3 r4 r* r+ Zcrypto_box_NONCEBYTESrG r r5 r6 r r: r r r# rD r r7 r rE r r r r rR rS rT r r r r rF � sP ���� ����� �.���� �&�_Keyc @ s� e Zd ZU dZeed< ee ed< defdd�Zdefdd �Z e j fd ed e j defd d �Z e j fddded e j defdd�ZdS )� SealedBoxa_ 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 recipient_key: a :class:`~nacl.public.PublicKey` used to encrypt messages and derive nonces, or a :class:`~nacl.public.PrivateKey` used to decrypt messages. .. versionadded:: 1.2 r r= � recipient_keyc C s^ t |t�r|jtjd�| _d | _d S t |t�r*|jtjd�| _|jjtjd�| _d S t � d��)NrB z:SealedBox must be created from a PublicKey or a PrivateKey) r r rI r r7 r r= r: r r r )r rW r r r r Z s � � ��zSealedBox.__init__r c C r r r! r" r r r r# l r$ zSealedBox.__bytes__rM r 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 rI )r rM r rP rQ r r r rR o s zSealedBox.encryptr zSealedBox[PrivateKey]rP c C s4 |� |�}| jdu rtd��tj�|| j| j�}|S )a 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 :raises TypeError: if this SealedBox was created with a :class:`~nacl.public.PublicKey` rather than a :class:`~nacl.public.PrivateKey`. Nz4SealedBoxes created with a public key cannot decrypt)r r= r r* r+ Zcrypto_box_seal_openr )r rP r rM r r r rS � s ��zSealedBox.decryptN)r1 r2 r3 r4 r r6 r rU r r# r r7 r rR rS r r r r rV E s0 ��� � �����rV )�typingr r r r r Z nacl.bindingsr* r r r Z nacl.encodingr Z nacl.utilsr r r Z Encodabler r: rE rF rU rV r r r r �<module> s , g