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secret.cpython-310.pyc
o ��aL/ � @ sp d dl mZmZ d dlZd dlmZ d dlmZ d dlm Z m Z m Z G dd� dej e �Z G dd � d ej e �ZdS ) � )�ClassVar�OptionalN)�encoding)� exceptions)�EncryptedMessage� StringFixer�randomc @ s� e Zd ZU dZejjZee e d< ejj Z ee e d< ejj Zee e d< ejjZee e d< ejfdedejfdd �Zd efd d �Zd ejfdedee dejd efdd�Zd ejfdedee dejd efdd�Zd S )� SecretBoxuS 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. Encryption is done using `XSalsa20-Poly1305`_, and there are no practical limits on the number or size of messages (up to 2⁶⁴ messages, each up to 2⁶⁴ bytes). .. _XSalsa20-Poly1305: https://doc.libsodium.org/secret-key_cryptography/secretbox#algorithm-details :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. �KEY_SIZE� NONCE_SIZE�MACBYTES�MESSAGEBYTES_MAX�key�encoderc C �F |� |�}t|t�st�d��t|�| jkr t�d| j ��|| _d S )Nz'SecretBox must be created from 32 bytes�%The key must be exactly %s bytes long� �decode� isinstance�bytes�exc� TypeError�lenr � ValueError�_key��selfr r � r �-/usr/lib/python3/dist-packages/nacl/secret.py�__init__; s � zSecretBox.__init__�returnc C � | j S �N�r �r r r r � __bytes__I � zSecretBox.__bytes__N� plaintext�noncec C sn |du r t | j�}t|�| jkrt�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 r r r r �nacl�bindingsZcrypto_secretboxr �encoder � _from_parts)r r' r( r � ciphertext� encoded_nonce�encoded_ciphertextr r r �encryptL s �� �zSecretBox.encryptr. 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`] Nr) ) r r r r r r* r+ Zcrypto_secretbox_openr )r r. r( r r' r r r �decryptw s ��zSecretBox.decrypt)�__name__� __module__� __qualname__�__doc__r* r+ Zcrypto_secretbox_KEYBYTESr r �int�__annotations__Zcrypto_secretbox_NONCEBYTESr Zcrypto_secretbox_MACBYTESr Z!crypto_secretbox_MESSAGEBYTES_MAXr r � RawEncoderr �Encoderr r% r r r1 r3 r r r r r sL ���� ����� �.�����r c @ s� e Zd ZdZejjZejjZ ejj Z ejj Z ejfdedejfdd�Zdefdd�Zd d ejfd ed ed ee dejdef dd�Zd d ejfded ed ee dejdef dd�Zd S )�Aeadu� The AEAD class encrypts and decrypts messages using the given secret key. Unlike :class:`~nacl.secret.SecretBox`, AEAD supports authenticating non-confidential data received alongside the message, such as a length or type tag. Like :class:`~nacl.secret.Secretbox`, this class provides authenticated encryption. An inauthentic message will cause the decrypt function to raise an exception. Likewise, the authenticator should not be mistaken for a (public-key) signature: recipients (with the ability to decrypt messages) are capable of creating arbitrary valid message; in particular, this means AEAD messages are repudiable. For non-repudiable messages, sign them after encryption. The cryptosystem used is `XChacha20-Poly1305`_ as specified for `standardization`_. There are `no practical limits`_ to how much can safely be encrypted under a given key (up to 2⁶⁴ messages each containing up to 2⁶⁴ bytes). .. _standardization: https://datatracker.ietf.org/doc/html/draft-irtf-cfrg-xchacha .. _XChacha20-Poly1305: https://doc.libsodium.org/secret-key_cryptography/aead#xchacha-20-poly1305 .. _no practical limits: https://doc.libsodium.org/secret-key_cryptography/aead#limitations :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. r r c C r )Nz"AEAD must be created from 32 bytesr r r r r r r � s � z Aead.__init__r c C r! r" r# r$ r r r r% � r& zAead.__bytes__� Nr' �aadr( c C sp |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 for :param nonce: to be unique. By default, it is generated randomly; [:class:`Aead`] uses XChacha20 for extended (192b) nonce size, so the risk of reusing random nonces is negligible. It is *strongly recommended* to keep this behaviour, as nonce reuse will compromise the privacy of encrypted messages. Should implicit nonces be inadequate for your application, the second best option is using split counters; e.g. if sending messages encrypted under a shared key between 2 users, each user can use the number of messages it sent so far, prefixed or suffixed with a 1bit user id. Note that the counter must **never** be rolled back (due to overflow, on-disk state being rolled back to an earlier backup, ...) :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`] Nr) ) r r r r r r* r+ Z*crypto_aead_xchacha20poly1305_ietf_encryptr r, r r- )r r' r> r( r r. r/ r0 r r r r1 � s � � �z Aead.encryptr. c C sd |� |�}|du r|d| j� }|| jd� }t|�| jkr&t�d| j ��tj�|||| j�}|S r2 ) r r r r r r* r+ Z*crypto_aead_xchacha20poly1305_ietf_decryptr )r r. r> r( r r' r r r r3 s � �z Aead.decrypt)r4 r5 r6 r7 r* r+ Z+crypto_aead_xchacha20poly1305_ietf_KEYBYTESr Z,crypto_aead_xchacha20poly1305_ietf_NPUBBYTESr Z)crypto_aead_xchacha20poly1305_ietf_ABYTESr Z3crypto_aead_xchacha20poly1305_ietf_MESSAGEBYTES_MAXr r r: r r; r r% r r r1 r3 r r r r r< � sT $��� ������ �6������r< )�typingr r Z nacl.bindingsr* r r r Z nacl.utilsr r r Z Encodabler r< r r r r �<module> s