o »­§iX/ã@spddlmZmZddlZddlmZddlmZddlm Z m Z m Z Gdd„dej e ƒZ Gdd „d ej e ƒZdS) é)ÚClassVarÚOptionalN)Úencoding)Ú exceptions)ÚEncryptedMessageÚ StringFixerÚrandomc @sÚeZdZUdZejjZee e d<ejj Z ee e d<ejj Zee e d<ejjZee e d<ejfdedejfdd „Zd efd d „Zd ejfdedeedejd efdd„Zd ejfdedeedejd efdd„Zd S)Ú 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 2â¶â´ messages, each up to 2â¶â´ 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. ÚKEY_SIZEÚ NONCE_SIZEÚMACBYTESÚMESSAGEBYTES_MAXÚkeyÚencodercCóF| |¡}t|tƒst d¡‚t|ƒ|jkrt d|j¡‚||_dS)Nz'SecretBox must be created from 32 bytesú%The key must be exactly %s bytes long© ÚdecodeÚ isinstanceÚbytesÚexcÚ TypeErrorÚlenr Ú ValueErrorÚ_key©Úselfrr©rúB/home/app/Keep/.python/lib/python3.10/site-packages/nacl/secret.pyÚ__init__;s   ÿ zSecretBox.__init__ÚreturncCó|jS©N©r©rrrrÚ __bytes__IózSecretBox.__bytes__NÚ plaintextÚnoncecCsn|dur t|jƒ}t|ƒ|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`] Nú'The nonce must be exactly %s bytes long) rr rrrÚnaclÚbindingsZcrypto_secretbox_easyrÚencoderÚ _from_parts)rr'r(rÚ ciphertextÚ encoded_nonceÚencoded_ciphertextrrrÚencryptLs  ÿÿ   ýzSecretBox.encryptr.cCsb| |¡}|dur|d|j…}||jd…}t|ƒ|jkr&t d|j¡‚tj |||j¡}|S©aá 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+Zcrypto_secretbox_open_easyr)rr.r(rr'rrrÚdecryptws ÿÿzSecretBox.decrypt)Ú__name__Ú __module__Ú __qualname__Ú__doc__r*r+Zcrypto_secretbox_KEYBYTESr rÚintÚ__annotations__Zcrypto_secretbox_NONCEBYTESr Zcrypto_secretbox_MACBYTESr Z!crypto_secretbox_MESSAGEBYTES_MAXr rÚ RawEncoderrÚEncoderrr%rrr1r3rrrrr sH ÿÿÿ ÿüþýü û.üþýüûr c @s´eZdZdZejjZejjZ ejj Z ejj Z ejfdedejfdd„Zdefdd„Zd d ejfd ed ed eedejdef dd„Zd d ejfded ed eedejdef dd„Zd S)ÚAeaduñ 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 2â¶â´ messages each containing up to 2â¶â´ 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 bytesrrrrrrrÈs   ÿ z Aead.__init__r cCr!r"r#r$rrrr%Ør&zAead.__bytes__óNr'Úaadr(cCsp|dur t|jƒ}t|ƒ|jkrt d|j¡‚tj ||||j¡}|  |¡}|  |¡}t   |||  ||¡¡S)a@ Encrypts the plaintext message using the given `nonce` (or generates one randomly if omitted) and returns the ciphertext encoded with the encoder. .. warning:: It is vitally important for :param nonce: to be unique. By default, it is generated randomly; [:class:`Aead`] uses XChacha20 for extended (192b) nonce size, so the risk of reusing random nonces is negligible. It is *strongly recommended* to keep this behaviour, as nonce reuse will compromise the privacy of encrypted messages. Should implicit nonces be inadequate for your application, the second best option is using split counters; e.g. if sending messages encrypted under a shared key between 2 users, each user can use the number of messages it sent so far, prefixed or suffixed with a 1bit user id. Note that the counter must **never** be rolled back (due to overflow, on-disk state being rolled back to an earlier backup, ...) :param plaintext: [:class:`bytes`] The plaintext message to encrypt :param nonce: [:class:`bytes`] The nonce to use in the encryption :param encoder: The encoder to use to encode the ciphertext :rtype: [:class:`nacl.utils.EncryptedMessage`] Nr)) rr rrrr*r+Z*crypto_aead_xchacha20poly1305_ietf_encryptrr,rr-)rr'r>r(rr.r/r0rrrr1Ûs  ÿ ÿ   ýz Aead.encryptr.cCsd| |¡}|dur|d|j…}||jd…}t|ƒ|jkr&t d|j¡‚tj ||||j¡}|Sr2) rr rrrr*r+Z*crypto_aead_xchacha20poly1305_ietf_decryptr)rr.r>r(rr'rrrr3s ÿ ÿz Aead.decrypt)r4r5r6r7r*r+Z+crypto_aead_xchacha20poly1305_ietf_KEYBYTESr Z,crypto_aead_xchacha20poly1305_ietf_NPUBBYTESr Z)crypto_aead_xchacha20poly1305_ietf_ABYTESr Z3crypto_aead_xchacha20poly1305_ietf_MESSAGEBYTES_MAXr rr:rr;rr%rrr1r3rrrrr<œsT$ÿýþ ýûþýüû ú6ûþýüûúr<)ÚtypingrrZ nacl.bindingsr*rrrZ nacl.utilsrrrZ Encodabler r<rrrrÚs