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.. hazmat::
Ed448 signing
=============
.. currentmodule:: cryptography.hazmat.primitives.asymmetric.ed448
Ed448 is an elliptic curve signing algorithm using `EdDSA`_.
Signing & Verification
~~~~~~~~~~~~~~~~~~~~~~
.. doctest::
>>> from cryptography.hazmat.primitives.asymmetric.ed448 import Ed448PrivateKey
>>> private_key = Ed448PrivateKey.generate()
>>> signature = private_key.sign(b"my authenticated message")
>>> public_key = private_key.public_key()
>>> # Raises InvalidSignature if verification fails
>>> public_key.verify(signature, b"my authenticated message")
Key interfaces
~~~~~~~~~~~~~~
.. class:: Ed448PrivateKey
.. versionadded:: 2.6
.. classmethod:: generate()
Generate an Ed448 private key.
:returns: :class:`Ed448PrivateKey`
.. classmethod:: from_private_bytes(data)
:param data: 57 byte private key.
:type data: :term:`bytes-like`
:returns: :class:`Ed448PrivateKey`
.. method:: public_key()
:returns: :class:`Ed448PublicKey`
.. method:: sign(data)
:param bytes data: The data to sign.
:returns bytes: The 114 byte signature.
.. method:: private_bytes(encoding, format, encryption_algorithm)
Allows serialization of the key to bytes. Encoding (
:attr:`~cryptography.hazmat.primitives.serialization.Encoding.PEM`,
:attr:`~cryptography.hazmat.primitives.serialization.Encoding.DER`, or
:attr:`~cryptography.hazmat.primitives.serialization.Encoding.Raw`) and
format (
:attr:`~cryptography.hazmat.primitives.serialization.PrivateFormat.PKCS8`
or
:attr:`~cryptography.hazmat.primitives.serialization.PrivateFormat.Raw`
) are chosen to define the exact serialization.
:param encoding: A value from the
:class:`~cryptography.hazmat.primitives.serialization.Encoding` enum.
:param format: A value from the
:class:`~cryptography.hazmat.primitives.serialization.PrivateFormat`
enum. If the ``encoding`` is
:attr:`~cryptography.hazmat.primitives.serialization.Encoding.Raw`
then ``format`` must be
:attr:`~cryptography.hazmat.primitives.serialization.PrivateFormat.Raw`
, otherwise it must be
:attr:`~cryptography.hazmat.primitives.serialization.PrivateFormat.PKCS8`.
:param encryption_algorithm: An instance of an object conforming to the
:class:`~cryptography.hazmat.primitives.serialization.KeySerializationEncryption`
interface.
:return bytes: Serialized key.
.. class:: Ed448PublicKey
.. versionadded:: 2.6
.. classmethod:: from_public_bytes(data)
:param bytes data: 57 byte public key.
:returns: :class:`Ed448PublicKey`
.. method:: public_bytes(encoding, format)
Allows serialization of the key to bytes. Encoding (
:attr:`~cryptography.hazmat.primitives.serialization.Encoding.PEM`,
:attr:`~cryptography.hazmat.primitives.serialization.Encoding.DER`, or
:attr:`~cryptography.hazmat.primitives.serialization.Encoding.Raw`) and
format (
:attr:`~cryptography.hazmat.primitives.serialization.PublicFormat.SubjectPublicKeyInfo`
or
:attr:`~cryptography.hazmat.primitives.serialization.PublicFormat.Raw`
) are chosen to define the exact serialization.
:param encoding: A value from the
:class:`~cryptography.hazmat.primitives.serialization.Encoding` enum.
:param format: A value from the
:class:`~cryptography.hazmat.primitives.serialization.PublicFormat`
enum. If the ``encoding`` is
:attr:`~cryptography.hazmat.primitives.serialization.Encoding.Raw`
then ``format`` must be
:attr:`~cryptography.hazmat.primitives.serialization.PublicFormat.Raw`
, otherwise it must be
:attr:`~cryptography.hazmat.primitives.serialization.PublicFormat.SubjectPublicKeyInfo`.
:returns bytes: The public key bytes.
.. method:: verify(signature, data)
:param bytes signature: The signature to verify.
:param bytes data: The data to verify.
:raises cryptography.exceptions.InvalidSignature: Raised when the
signature cannot be verified.
.. _`EdDSA`: https://en.wikipedia.org/wiki/EdDSA