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from typing import Any, Optional, Type
from cryptography.hazmat.primitives import serialization
from dns.dnssecalgs.base import GenericPrivateKey, GenericPublicKey
from dns.exception import AlgorithmKeyMismatch
class CryptographyPublicKey(GenericPublicKey):
key: Any = None
key_cls: Any = None
def __init__(self, key: Any) -> None: # pylint: disable=super-init-not-called
if self.key_cls is None:
raise TypeError("Undefined private key class")
if not isinstance( # pylint: disable=isinstance-second-argument-not-valid-type
key, self.key_cls
):
raise AlgorithmKeyMismatch
self.key = key
@classmethod
def from_pem(cls, public_pem: bytes) -> "GenericPublicKey":
key = serialization.load_pem_public_key(public_pem)
return cls(key=key)
def to_pem(self) -> bytes:
return self.key.public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PublicFormat.SubjectPublicKeyInfo,
)
class CryptographyPrivateKey(GenericPrivateKey):
key: Any = None
key_cls: Any = None
public_cls: Type[CryptographyPublicKey]
def __init__(self, key: Any) -> None: # pylint: disable=super-init-not-called
if self.key_cls is None:
raise TypeError("Undefined private key class")
if not isinstance( # pylint: disable=isinstance-second-argument-not-valid-type
key, self.key_cls
):
raise AlgorithmKeyMismatch
self.key = key
def public_key(self) -> "CryptographyPublicKey":
return self.public_cls(key=self.key.public_key())
@classmethod
def from_pem(
cls, private_pem: bytes, password: Optional[bytes] = None
) -> "GenericPrivateKey":
key = serialization.load_pem_private_key(private_pem, password=password)
return cls(key=key)
def to_pem(self, password: Optional[bytes] = None) -> bytes:
encryption_algorithm: serialization.KeySerializationEncryption
if password:
encryption_algorithm = serialization.BestAvailableEncryption(password)
else:
encryption_algorithm = serialization.NoEncryption()
return self.key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=encryption_algorithm,
)