3 X-#@sddlmZmZmZddlZddlmZddlmZddl m Z m Z m Z Gdddej e eZGdd d ej e eZGd d d ej e eZdS) )absolute_importdivisionprint_functionN)encoding) exceptions)EncryptedMessage StringFixerrandomc@sFeZdZdZejjZej fddZ ddZ ddZ 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 cCsH|j||_t|jts"tjdt|j|jkrDtjdj |jdS)Nz'PublicKey must be created from 32 bytesz-The public key must be exactly {0} bytes long) decode _public_key isinstancebytesexc TypeErrorlenSIZE ValueErrorformat)self public_keyencoderr-/usr/lib/python3/dist-packages/nacl/public.py__init__$s   zPublicKey.__init__cCs|jS)N)r )rrrr __bytes__/szPublicKey.__bytes__cCs tt|S)N)hashr)rrrr__hash__2szPublicKey.__hash__cCs&t||jsdStjjt|t|S)NF)r __class__naclbindings sodium_memcmpr)rotherrrr__eq__5s zPublicKey.__eq__cCs ||k S)Nr)rr"rrr__ne__:szPublicKey.__ne__N)__name__ __module__ __qualname____doc__rr Zcrypto_box_PUBLICKEYBYTESrr RawEncoderrrrr#r$rrrrr s  r c@sReZdZdZejjZej fddZ ddZ ddZ dd Z d d Zed d 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 cCs\|j|}t|tstjdt||jkrs r*c@sbeZdZdZejjZddZddZ e e j fddZ de j fd d Zde j fd d Zd dZdS)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. cCsZ|rP|rPt|t s t|t r*tjdtjj|jt j d|jt j d|_ nd|_ dS)Nz5Box must be created from a PrivateKey and a PublicKey)r) r r*r rrrr Zcrypto_box_beforenmencoderr) _shared_key)rr,rrrrrs    z Box.__init__cCs|jS)N)r2)rrrrrsz Box.__bytes__cCs|dd}|j||_|S)N)r r2)r-ZencodedrZboxrrrr s  z Box.decodeNcCsn|dkrt|j}t||jkr0tjd|jtjj|||j}|j |}|j |}t j |||j ||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`] Nz'The nonce must be exactly %s bytes long) r NONCE_SIZErrrrr Zcrypto_box_afternmr2r1rZ _from_parts)r plaintextnoncer ciphertextZ encoded_nonceZencoded_ciphertextrrrencrypts    z Box.encryptcCsb|j|}|dkr.|d|j}||jd}t||jkrLtjd|jtjj|||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`] Nz'The nonce must be exactly %s bytes long) r r3rrrrr Zcrypto_box_open_afternmr2)rr6r5rr4rrrdecrypts  z Box.decryptcCs|jS)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`] )r2)rrrr shared_keys zBox.shared_key)r%r&r'r(rr Zcrypto_box_NONCEBYTESr3rrr/rr)r r7r8r9rrrrr0xs  % r0)Z __future__rrrZ nacl.bindingsrrrrZ nacl.utilsrrr Z Encodableobjectr r*r0rrrrs  ':