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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, hashes
from cryptography.hazmat.primitives.asymmetric import utils as asym_utils
class DSAParameters(metaclass=abc.ABCMeta):
@abc.abstractmethod
def generate_private_key(self) -> DSAPrivateKey:
"""
Generates and returns a DSAPrivateKey.
"""
@abc.abstractmethod
def parameter_numbers(self) -> DSAParameterNumbers:
"""
Returns a DSAParameterNumbers.
"""
DSAParametersWithNumbers = DSAParameters
DSAParameters.register(rust_openssl.dsa.DSAParameters)
class DSAPrivateKey(metaclass=abc.ABCMeta):
@property
@abc.abstractmethod
def key_size(self) -> int:
"""
The bit length of the prime modulus.
"""
@abc.abstractmethod
def public_key(self) -> DSAPublicKey:
"""
The DSAPublicKey associated with this private key.
"""
@abc.abstractmethod
def parameters(self) -> DSAParameters:
"""
The DSAParameters object associated with this private key.
"""
@abc.abstractmethod
def sign(
self,
data: bytes,
algorithm: asym_utils.Prehashed | hashes.HashAlgorithm,
) -> bytes:
"""
Signs the data
"""
@abc.abstractmethod
def private_numbers(self) -> DSAPrivateNumbers:
"""
Returns a DSAPrivateNumbers.
"""
@abc.abstractmethod
def private_bytes(
self,
encoding: _serialization.Encoding,
format: _serialization.PrivateFormat,
encryption_algorithm: _serialization.KeySerializationEncryption,
) -> bytes:
"""
Returns the key serialized as bytes.
"""
DSAPrivateKeyWithSerialization = DSAPrivateKey
DSAPrivateKey.register(rust_openssl.dsa.DSAPrivateKey)
class DSAPublicKey(metaclass=abc.ABCMeta):
@property
@abc.abstractmethod
def key_size(self) -> int:
"""
The bit length of the prime modulus.
"""
@abc.abstractmethod
def parameters(self) -> DSAParameters:
"""
The DSAParameters object associated with this public key.
"""
@abc.abstractmethod
def public_numbers(self) -> DSAPublicNumbers:
"""
Returns a DSAPublicNumbers.
"""
@abc.abstractmethod
def public_bytes(
self,
encoding: _serialization.Encoding,
format: _serialization.PublicFormat,
) -> bytes:
"""
Returns the key serialized as bytes.
"""
@abc.abstractmethod
def verify(
self,
signature: bytes,
data: bytes,
algorithm: asym_utils.Prehashed | hashes.HashAlgorithm,
) -> None:
"""
Verifies the signature of the data.
"""
@abc.abstractmethod
def __eq__(self, other: object) -> bool:
"""
Checks equality.
"""
DSAPublicKeyWithSerialization = DSAPublicKey
DSAPublicKey.register(rust_openssl.dsa.DSAPublicKey)
DSAPrivateNumbers = rust_openssl.dsa.DSAPrivateNumbers
DSAPublicNumbers = rust_openssl.dsa.DSAPublicNumbers
DSAParameterNumbers = rust_openssl.dsa.DSAParameterNumbers
def generate_parameters(
key_size: int, backend: typing.Any = None
) -> DSAParameters:
if key_size not in (1024, 2048, 3072, 4096):
raise ValueError("Key size must be 1024, 2048, 3072, or 4096 bits.")
return rust_openssl.dsa.generate_parameters(key_size)
def generate_private_key(
key_size: int, backend: typing.Any = None
) -> DSAPrivateKey:
parameters = generate_parameters(key_size)
return parameters.generate_private_key()
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