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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 cCsT||}t|tr"t||jks4td|jtj |}||_ t ||_ dS)Nz?PrivateKey must be created from a {0} bytes long raw secret key)r r rrrrrrr#r$Zcrypto_scalarmult_base _private_keyr r)r private_keyrZraw_public_keyrrrrSs    zPrivateKey.__init__cCsL||}t|tr"t||jks4td|jtj |\}}||S)ah Generate a PrivateKey using a deterministic construction starting from a caller-provided seed .. warning:: The seed **must** be high-entropy; therefore, its generator **must** be a cryptographic quality random function like, for example, :func:`~nacl.utils.random`. .. warning:: The seed **must** be protected and remain secret. Anyone who knows the seed is really in possession of the corresponding PrivateKey. :param seed: The seed used to generate the private key :rtype: :class:`~nacl.public.PrivateKey` z8PrivateKey seed must be a {0} bytes long binary sequence) r r rr SEED_SIZErrrr#r$Zcrypto_box_seed_keypair)clsZseedrZraw_pkZraw_skrrr from_seedbs zPrivateKey.from_seedcCs|jSr)r/rrrrrszPrivateKey.__bytes__cCstt|t|jfSr)rtyperrrrrrr szPrivateKey.__hash__cCst||jsdS|j|jkSr!)r r"rr%rrrr's zPrivateKey.__eq__cCs ||k Srrr%rrrr(szPrivateKey.__ne__cCs|ttjtjdS)z~ Generates a random :class:`~nacl.public.PrivateKey` object :rtype: :class:`~nacl.public.PrivateKey` r)r r.rrr-)r2rrrgenerateszPrivateKey.generateN)r)r*r+r,r#r$Zcrypto_box_SECRETKEYBYTESrZcrypto_box_SEEDBYTESr1rr-r classmethodr3rr r'r(r6rrrrr.?sr.c@sbeZdZdZejjZddZddZ e e j fddZ de j fd d Zde j fd d Zd dZdS)Boxa/ The Box class boxes and unboxes messages between a pair of keys The ciphertexts generated by :class:`~nacl.public.Box` include a 16 byte authenticator which is checked as part of the decryption. An invalid authenticator will cause the decrypt function to raise an exception. The authenticator is not a signature. Once you've decrypted the message you've demonstrated the ability to create arbitrary valid message, so messages you send are repudiable. For non-repudiable messages, sign them after encryption. :param private_key: :class:`~nacl.public.PrivateKey` used to encrypt and decrypt messages :param public_key: :class:`~nacl.public.PublicKey` used to encrypt and decrypt messages :cvar NONCE_SIZE: The size that the nonce is required to be. cCsV|rL|rLt|trt|ts&tdtj|jt j d|jt j d|_ nd|_ dS)Nz5Box must be created from a PrivateKey and a PublicKeyr5) r r.r rrr#r$Zcrypto_box_beforenmencoderr- _shared_key)rr0rrrrrs    z Box.__init__cCs|jSrr:rrrrrsz Box.__bytes__cCs|dd}|||_|Sr)r r:)r2ZencodedrZboxrrrr s  z Box.decodeNcCsn|dkrt|j}t||jkr0td|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 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 NONCE_SIZErrrr#r$Zcrypto_box_afternmr:r9rZ _from_parts)r plaintextnoncer ciphertextZ encoded_nonceencoded_ciphertextrrrencrypts$    z Box.encryptcCsb||}|dkr.|d|j}||jd}t||jkrLtd|jtj|||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=rrrr#r$Zcrypto_box_open_afternmr:)rr@r?rr>rrrdecrypts z Box.decryptcCs|jS)a Returns the Curve25519 shared secret, that can then be used as a key in other symmetric ciphers. .. warning:: It is **VITALLY** important that you use a nonce with your symmetric cipher. If you fail to do this, you compromise the privacy of the messages encrypted. Ensure that the key length of your cipher is 32 bytes. :rtype: [:class:`bytes`] r;rrrr shared_key s zBox.shared_key)r)r*r+r,r#r$Zcrypto_box_NONCEBYTESr=rrr7rr-r rBrCrDrrrrr8s  % r8c@s<eZdZdZddZddZejfddZejfdd Z d S) SealedBoxak 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 public_key: :class:`~nacl.public.PublicKey` used to encrypt messages and derive nonces :param private_key: :class:`~nacl.public.PrivateKey` used to decrypt messages .. versionadded:: 1.2 cCs^t|tr"|jtjd|_d|_n8t|trP|jtjd|_|jjtjd|_n t ddS)Nr5z:SealedBox must be created from a PublicKey or a PrivateKey) r r r9rr-r r/r.rrr)rZ recipient_keyrrrr.s   zSealedBox.__init__cCs|jSrrrrrrr=szSealedBox.__bytes__cCstj||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$Zcrypto_box_sealr r9)rr>rr@rArrrrB@s  zSealedBox.encryptcCs"||}tj||j|j}|S)ar Decrypts the ciphertext using the ephemeral public key enclosed in the ciphertext and the SealedBox private key, returning the plaintext message. :param ciphertext: [:class:`bytes`] The encrypted message to decrypt :param encoder: The encoder used to decode the ciphertext. :return bytes: The original plaintext )r r#r$Zcrypto_box_seal_openr r/)rr@rr>rrrrCYs zSealedBox.decryptN) r)r*r+r,rrrr-rBrCrrrrrEs rE)Z __future__rrrZ nacl.bindingsr#rrrZ nacl.utilsrrr Z Encodableobjectr r.r8rErrrrs  (X