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Generate a key for use with
:func:`.crypto_secretstream_xchacha20poly1305_init_push`.

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An object wrapping the crypto_secretstream_xchacha20poly1305 state.

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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

<EFBFBD>BState must be a crypto_secretstream_xchacha20poly1305_state object<63>
<01>raising<6E>Key must be a bytes sequence<63>Invalid key lengthzunsigned char []<5D>Unexpected failurer)r
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Add an encrypted message to the secret stream.

:param state: a secretstream state object
:type state: crypto_secretstream_xchacha20poly1305_state
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          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

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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

r9r:zHeader must be a bytes sequencezInvalid header lengthr<r=Nzunsigned char *r>)r
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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)

r9r:NzOState must be initialized using crypto_secretstream_xchacha20poly1305_init_pullzCiphertext is not byteszCiphertext is too shortzCiphertext is too longrOrr>r)r
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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

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