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# 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. from __future__ import annotations import abc import typing from cryptography.hazmat.bindings._rust import openssl as rust_openssl from cryptography.hazmat.primitives import _serialization def generate_parameters( generator: int, key_size: int, backend: typing.Any = None ) -> DHParameters: from cryptography.hazmat.backends.openssl.backend import backend as ossl return ossl.generate_dh_parameters(generator, key_size) class DHParameterNumbers: def __init__(self, p: int, g: int, q: typing.Optional[int] = None) -> None: if not isinstance(p, int) or not isinstance(g, int): raise TypeError("p and g must be integers") if q is not None and not isinstance(q, int): raise TypeError("q must be integer or None") if g < 2: raise ValueError("DH generator must be 2 or greater") if p.bit_length() < rust_openssl.dh.MIN_MODULUS_SIZE: raise ValueError( f"p (modulus) must be at least " f"{rust_openssl.dh.MIN_MODULUS_SIZE}-bit" ) self._p = p self._g = g self._q = q def __eq__(self, other: object) -> bool: if not isinstance(other, DHParameterNumbers): return NotImplemented return ( self._p == other._p and self._g == other._g and self._q == other._q ) def parameters(self, backend: typing.Any = None) -> DHParameters: from cryptography.hazmat.backends.openssl.backend import ( backend as ossl, ) return ossl.load_dh_parameter_numbers(self) @property def p(self) -> int: return self._p @property def g(self) -> int: return self._g @property def q(self) -> typing.Optional[int]: return self._q class DHPublicNumbers: def __init__(self, y: int, parameter_numbers: DHParameterNumbers) -> None: if not isinstance(y, int): raise TypeError("y must be an integer.") if not isinstance(parameter_numbers, DHParameterNumbers): raise TypeError( "parameters must be an instance of DHParameterNumbers." ) self._y = y self._parameter_numbers = parameter_numbers def __eq__(self, other: object) -> bool: if not isinstance(other, DHPublicNumbers): return NotImplemented return ( self._y == other._y and self._parameter_numbers == other._parameter_numbers ) def public_key(self, backend: typing.Any = None) -> DHPublicKey: from cryptography.hazmat.backends.openssl.backend import ( backend as ossl, ) return ossl.load_dh_public_numbers(self) @property def y(self) -> int: return self._y @property def parameter_numbers(self) -> DHParameterNumbers: return self._parameter_numbers class DHPrivateNumbers: def __init__(self, x: int, public_numbers: DHPublicNumbers) -> None: if not isinstance(x, int): raise TypeError("x must be an integer.") if not isinstance(public_numbers, DHPublicNumbers): raise TypeError( "public_numbers must be an instance of " "DHPublicNumbers." ) self._x = x self._public_numbers = public_numbers def __eq__(self, other: object) -> bool: if not isinstance(other, DHPrivateNumbers): return NotImplemented return ( self._x == other._x and self._public_numbers == other._public_numbers ) def private_key(self, backend: typing.Any = None) -> DHPrivateKey: from cryptography.hazmat.backends.openssl.backend import ( backend as ossl, ) return ossl.load_dh_private_numbers(self) @property def public_numbers(self) -> DHPublicNumbers: return self._public_numbers @property def x(self) -> int: return self._x class DHParameters(metaclass=abc.ABCMeta): @abc.abstractmethod def generate_private_key(self) -> DHPrivateKey: """ Generates and returns a DHPrivateKey. """ @abc.abstractmethod def parameter_bytes( self, encoding: _serialization.Encoding, format: _serialization.ParameterFormat, ) -> bytes: """ Returns the parameters serialized as bytes. """ @abc.abstractmethod def parameter_numbers(self) -> DHParameterNumbers: """ Returns a DHParameterNumbers. """ DHParametersWithSerialization = DHParameters DHParameters.register(rust_openssl.dh.DHParameters) class DHPublicKey(metaclass=abc.ABCMeta): @property @abc.abstractmethod def key_size(self) -> int: """ The bit length of the prime modulus. """ @abc.abstractmethod def parameters(self) -> DHParameters: """ The DHParameters object associated with this public key. """ @abc.abstractmethod def public_numbers(self) -> DHPublicNumbers: """ Returns a DHPublicNumbers. """ @abc.abstractmethod def public_bytes( self, encoding: _serialization.Encoding, format: _serialization.PublicFormat, ) -> bytes: """ Returns the key serialized as bytes. """ @abc.abstractmethod def __eq__(self, other: object) -> bool: """ Checks equality. """ DHPublicKeyWithSerialization = DHPublicKey DHPublicKey.register(rust_openssl.dh.DHPublicKey) class DHPrivateKey(metaclass=abc.ABCMeta): @property @abc.abstractmethod def key_size(self) -> int: """ The bit length of the prime modulus. """ @abc.abstractmethod def public_key(self) -> DHPublicKey: """ The DHPublicKey associated with this private key. """ @abc.abstractmethod def parameters(self) -> DHParameters: """ The DHParameters object associated with this private key. """ @abc.abstractmethod def exchange(self, peer_public_key: DHPublicKey) -> bytes: """ Given peer's DHPublicKey, carry out the key exchange and return shared key as bytes. """ @abc.abstractmethod def private_numbers(self) -> DHPrivateNumbers: """ Returns a DHPrivateNumbers. """ @abc.abstractmethod def private_bytes( self, encoding: _serialization.Encoding, format: _serialization.PrivateFormat, encryption_algorithm: _serialization.KeySerializationEncryption, ) -> bytes: """ Returns the key serialized as bytes. """ DHPrivateKeyWithSerialization = DHPrivateKey DHPrivateKey.register(rust_openssl.dh.DHPrivateKey)