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File Content: `ed25519.py`

# This file is dual licensed under the terms of the Apache License, Version
# 2.0, and the BSD License. See the LICENSE file in the root of this repository
# for complete details.


import abc

from cryptography.exceptions import UnsupportedAlgorithm, _Reasons
from cryptography.hazmat.primitives import _serialization


_ED25519_KEY_SIZE = 32
_ED25519_SIG_SIZE = 64


class Ed25519PublicKey(metaclass=abc.ABCMeta):
    @classmethod
    def from_public_bytes(cls, data: bytes) -> "Ed25519PublicKey":
        from cryptography.hazmat.backends.openssl.backend import backend

        if not backend.ed25519_supported():
            raise UnsupportedAlgorithm(
                "ed25519 is not supported by this version of OpenSSL.",
                _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM,
            )

        return backend.ed25519_load_public_bytes(data)

    @abc.abstractmethod
    def public_bytes(
        self,
        encoding: _serialization.Encoding,
        format: _serialization.PublicFormat,
    ) -> bytes:
        """
        The serialized bytes of the public key.
        """

    @abc.abstractmethod
    def verify(self, signature: bytes, data: bytes) -> None:
        """
        Verify the signature.
        """


class Ed25519PrivateKey(metaclass=abc.ABCMeta):
    @classmethod
    def generate(cls) -> "Ed25519PrivateKey":
        from cryptography.hazmat.backends.openssl.backend import backend

        if not backend.ed25519_supported():
            raise UnsupportedAlgorithm(
                "ed25519 is not supported by this version of OpenSSL.",
                _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM,
            )

        return backend.ed25519_generate_key()

    @classmethod
    def from_private_bytes(cls, data: bytes) -> "Ed25519PrivateKey":
        from cryptography.hazmat.backends.openssl.backend import backend

        if not backend.ed25519_supported():
            raise UnsupportedAlgorithm(
                "ed25519 is not supported by this version of OpenSSL.",
                _Reasons.UNSUPPORTED_PUBLIC_KEY_ALGORITHM,
            )

        return backend.ed25519_load_private_bytes(data)

    @abc.abstractmethod
    def public_key(self) -> Ed25519PublicKey:
        """
        The Ed25519PublicKey derived from the private key.
        """

    @abc.abstractmethod
    def private_bytes(
        self,
        encoding: _serialization.Encoding,
        format: _serialization.PrivateFormat,
        encryption_algorithm: _serialization.KeySerializationEncryption,
    ):
        """
        The serialized bytes of the private key.
        """

    @abc.abstractmethod
    def sign(self, data: bytes) -> bytes:
        """
        Signs the data.
        """

Name	Size	Permission
__pycache__	---	0755
__init__.py	909 bytes	0644
dh.py	6303 bytes	0644
dsa.py	8116 bytes	0644
ec.py	14613 bytes	0644
ed25519.py	2719 bytes	0644
ed448.py	2630 bytes	0644
padding.py	2115 bytes	0644
rsa.py	12004 bytes	0644
utils.py	1225 bytes	0644
x25519.py	2588 bytes	0644
x448.py	2549 bytes	0644

File Content: ed25519.py

File Content: `ed25519.py`