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exceptions)�ffi�lib)�ensure�,crypto_secretstream_xchacha20poly1305_ABYTES�1crypto_secretstream_xchacha20poly1305_HEADERBYTES�.crypto_secretstream_xchacha20poly1305_KEYBYTES�6crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX�0crypto_secretstream_xchacha20poly1305_STATEBYTES�1crypto_secretstream_xchacha20poly1305_TAG_MESSAGE�.crypto_secretstream_xchacha20poly1305_TAG_PUSH�/crypto_secretstream_xchacha20poly1305_TAG_REKEY�/crypto_secretstream_xchacha20poly1305_TAG_FINAL�returnc C s( t �dt�} t�| � t �| �dd� S )zd
Generate a key for use with
:func:`.crypto_secretstream_xchacha20poly1305_init_push`.
�unsigned char[]N)r �newr r �,crypto_secretstream_xchacha20poly1305_keygen�buffer)�keybuf� r �C/usr/lib/python3/dist-packages/nacl/bindings/crypto_secretstream.pyr 4 s �
r c @ s" e Zd ZdZg d�Zddd�ZdS )�+crypto_secretstream_xchacha20poly1305_statezN
An object wrapping the crypto_secretstream_xchacha20poly1305 state.
)�statebuf�rawbuf�tagbufr Nc C s t �dt�| _d| _d| _dS )z Initialize a clean state object.r N)r r r r r r )�selfr r r �__init__J s �
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| j||�}t |dkdtjd� t �|�dd� S ) a\
Initialize a crypto_secretstream_xchacha20poly1305 encryption buffer.
:param state: a secretstream state object
:type state: crypto_secretstream_xchacha20poly1305_state
:param key: must be
:data:`.crypto_secretstream_xchacha20poly1305_KEYBYTES` long
:type key: bytes
:return: header
:rtype: bytes
�BState must be a crypto_secretstream_xchacha20poly1305_state object��raising� Key must be a bytes sequence�Invalid key lengthzunsigned char []r �Unexpected failureN)r �
isinstancer �exc� TypeError�bytes�lenr �
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Add an encrypted message to the secret stream.
:param state: a secretstream state object
:type state: crypto_secretstream_xchacha20poly1305_state
:param m: the message to encrypt, the maximum length of an individual
message is
:data:`.crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX`.
:type m: bytes
:param ad: additional data to include in the authentication tag
:type ad: bytes or None
:param tag: the message tag, usually
:data:`.crypto_secretstream_xchacha20poly1305_TAG_MESSAGE` or
:data:`.crypto_secretstream_xchacha20poly1305_TAG_FINAL`.
:type tag: int
:return: ciphertext
:rtype: bytes
r( r) zMessage is not byteszMessage is too longN�%Additional data must be bytes or Noner r r- )r r. r r/ r0 r1 r2 r
r3 r
r r r �NULLr �*crypto_secretstream_xchacha20poly1305_pushr r5 r )r& r8 r9 r: �clen�adlenr7 r r r r= � sF �
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Initialize a crypto_secretstream_xchacha20poly1305 decryption buffer.
:param state: a secretstream state object
:type state: crypto_secretstream_xchacha20poly1305_state
:param header: must be
:data:`.crypto_secretstream_xchacha20poly1305_HEADERBYTES` long
:type header: bytes
:param key: must be
:data:`.crypto_secretstream_xchacha20poly1305_KEYBYTES` long
:type key: bytes
r( r) z Header must be a bytes sequencezInvalid header lengthr+ r, Nzunsigned char *r r- )r r. r r/ r0 r1 r2 r r3 r r r r r �/crypto_secretstream_xchacha20poly1305_init_pullr r5 )r& r@ r' r7 r r r rA � s> ��
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Read a decrypted message from the secret stream.
:param state: a secretstream state object
:type state: crypto_secretstream_xchacha20poly1305_state
:param c: the ciphertext to decrypt, the maximum length of an individual
ciphertext is
:data:`.crypto_secretstream_xchacha20poly1305_MESSAGEBYTES_MAX` +
:data:`.crypto_secretstream_xchacha20poly1305_ABYTES`.
:type c: bytes
:param ad: additional data to include in the authentication tag
:type ad: bytes or None
:return: (message, tag)
:rtype: (bytes, int)
r( r) NzOState must be initialized using crypto_secretstream_xchacha20poly1305_init_pullzCiphertext is not byteszCiphertext is too shortzCiphertext is too longr; r r r- )r r. r r/ r0 r r3 r1 r2 r
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r r r r< r �*crypto_secretstream_xchacha20poly1305_pullr r5 r �intr )r& rB r9 �mlenr? r7 r r r rC � sn ���
���� � �
�rC c C s& t t| t�dtjd� t�| j� dS )a�
Explicitly change the encryption key in the stream.
Normally the stream is re-keyed as needed or an explicit ``tag`` of
:data:`.crypto_secretstream_xchacha20poly1305_TAG_REKEY` is added to a
message to ensure forward secrecy, but this method can be used instead
if the re-keying is controlled without adding the tag.
:param state: a secretstream state object
:type state: crypto_secretstream_xchacha20poly1305_state
r( r) N)r r. r r/ r0 r �+crypto_secretstream_xchacha20poly1305_rekeyr )r& r r r rF Q s �rF )N))�typingr r r r �naclr r/ � nacl._sodiumr r �nacl.exceptionsr �,crypto_secretstream_xchacha20poly1305_abytesr
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�0crypto_secretstream_xchacha20poly1305_statebytesr �1crypto_secretstream_xchacha20poly1305_tag_messager �.crypto_secretstream_xchacha20poly1305_tag_pushr �/crypto_secretstream_xchacha20poly1305_tag_rekeyr �/crypto_secretstream_xchacha20poly1305_tag_finalr r1 r r r4 r= rA rC rF r r r r �<module> s�
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