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Returns a randomly generated public and secret key.
:rtype: (bytes(public_key), bytes(secret_key))
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Returns a (public, secret) keypair deterministically generated
from an input ``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: bytes
:rtype: (bytes(public_key), bytes(secret_key))
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Encrypts and returns a message ``message`` using the secret key ``sk``,
public key ``pk``, and the nonce ``nonce``.
:param message: bytes
:param nonce: bytes
:param pk: bytes
:param sk: bytes
:rtype: bytes
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Decrypts and returns an encrypted message ``ciphertext``, using the secret
key ``sk``, public key ``pk``, and the nonce ``nonce``.
:param ciphertext: bytes
:param nonce: bytes
:param pk: bytes
:param sk: bytes
:rtype: bytes
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Computes and returns the shared key for the public key ``pk`` and the
secret key ``sk``. This can be used to speed up operations where the same
set of keys is going to be used multiple times.
:param pk: bytes
:param sk: bytes
:rtype: bytes
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Encrypts and returns the message ``message`` using the shared key ``k`` and
the nonce ``nonce``.
:param message: bytes
:param nonce: bytes
:param k: bytes
:rtype: bytes
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Decrypts and returns the encrypted message ``ciphertext``, using the shared
key ``k`` and the nonce ``nonce``.
:param ciphertext: bytes
:param nonce: bytes
:param k: bytes
:rtype: bytes
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Encrypts and returns a message ``message`` using an ephemeral secret key
and the public key ``pk``.
The ephemeral public key, which is embedded in the sealed box, is also
used, in combination with ``pk``, to derive the nonce needed for the
underlying box construct.
:param message: bytes
:param pk: bytes
:rtype: bytes
.. versionadded:: 1.2
s input message must be bytesR s public key must be bytess Invalid public keys unsigned char[]i s Unexpected library error( R R R R R R R
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Decrypts and returns an encrypted message ``ciphertext``, using the
recipent's secret key ``sk`` and the sender's ephemeral public key
embedded in the sealed box. The box contruct nonce is derived from
the recipient's public key ``pk`` and the sender's public key.
:param ciphertext: bytes
:param pk: bytes
:param sk: bytes
:rtype: bytes
.. versionadded:: 1.2
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