o gL/@spddlmZmZddlZddlmZddlmZddlm Z m Z m Z Gdddej e Z Gdd d ej e ZdS) )ClassVarOptionalN)encoding) exceptions)EncryptedMessage StringFixerrandomc @seZdZUdZejjZee e d<ejj Z ee e d<ejj Zee e d<ejjZee e d<ejfdedejfdd Zd efd d Zd ejfdedeedejd efddZd ejfdedeedejd efddZd 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_SIZEMACBYTESMESSAGEBYTES_MAXkeyencodercCF||}t|tstdt||jkrtd|j||_dS)Nz'SecretBox must be created from 32 bytes%The key must be exactly %s bytes long decode isinstancebytesexc TypeErrorlenr ValueError_keyselfrrrE/var/www/html/api-tag/env/lib/python3.10/site-packages/nacl/secret.py__init__;s    zSecretBox.__init__returncC|jSNrrrrr __bytes__IzSecretBox.__bytes__N plaintextnoncecCsn|dur t|j}t||jkrtd|jtj|||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) rr rrrnaclbindingscrypto_secretboxrencoder _from_parts)rr'r(r ciphertext encoded_nonceencoded_ciphertextrrrencryptLs     zSecretBox.encryptr/cCsb||}|dur|d|j}||jd}t||jkr&td|jtj|||j}|Sa 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)) rr rrrr*r+crypto_secretbox_openr)rr/r(rr'rrrdecryptws zSecretBox.decrypt)__name__ __module__ __qualname____doc__r*r+crypto_secretbox_KEYBYTESr rint__annotations__crypto_secretbox_NONCEBYTESr crypto_secretbox_MACBYTESr !crypto_secretbox_MESSAGEBYTES_MAXr r RawEncoderrEncoderrr%rrr2r5rrrrr sL   .r c @seZdZdZejjZejjZ ejj Z ejj Z ejfdedejfddZdefddZd d ejfd ed ed eedejdef ddZd d ejfded ed eedejdef ddZd 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. rrcCr)Nz"AEAD must be created from 32 bytesrrrrrrrs    z Aead.__init__r cCr!r"r#r$rrrr%r&zAead.__bytes__Nr'aadr(cCsp|dur t|j}t||jkrtd|jtj||||j}| |}| |}t ||| ||S)a@ Encrypts the plaintext message using the given `nonce` (or generates one randomly if omitted) and returns the ciphertext encoded with the encoder. .. warning:: It is vitally important for :param nonce: to be unique. By default, it is generated randomly; [:class:`Aead`] uses XChacha20 for extended (192b) nonce size, so the risk of reusing random nonces is negligible. It is *strongly recommended* to keep this behaviour, as nonce reuse will compromise the privacy of encrypted messages. Should implicit nonces be inadequate for your application, the second best option is using split counters; e.g. if sending messages encrypted under a shared key between 2 users, each user can use the number of messages it sent so far, prefixed or suffixed with a 1bit user id. Note that the counter must **never** be rolled back (due to overflow, on-disk state being rolled back to an earlier backup, ...) :param plaintext: [:class:`bytes`] The plaintext message to encrypt :param nonce: [:class:`bytes`] The nonce to use in the encryption :param encoder: The encoder to use to encode the ciphertext :rtype: [:class:`nacl.utils.EncryptedMessage`] Nr)) rr rrrr*r+*crypto_aead_xchacha20poly1305_ietf_encryptrr-rr.)rr'rDr(rr/r0r1rrrr2s      z Aead.encryptr/cCsd||}|dur|d|j}||jd}t||jkr&td|jtj||||j}|Sr3) rr rrrr*r+*crypto_aead_xchacha20poly1305_ietf_decryptr)rr/rDr(rr'rrrr5s  z Aead.decrypt)r6r7r8r9r*r++crypto_aead_xchacha20poly1305_ietf_KEYBYTESr ,crypto_aead_xchacha20poly1305_ietf_NPUBBYTESr )crypto_aead_xchacha20poly1305_ietf_ABYTESr 3crypto_aead_xchacha20poly1305_ietf_MESSAGEBYTES_MAXr rr@rrArr%rrr2r5rrrrrBsT$  6rB)typingrr nacl.bindingsr*rrr nacl.utilsrrr Encodabler rBrrrrs