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from typing import Type
from cryptography.hazmat.primitives import serialization
from cryptography.hazmat.primitives.asymmetric import ed448, ed25519
from dns.dnssecalgs.cryptography import CryptographyPrivateKey, CryptographyPublicKey
from dns.dnssectypes import Algorithm
from dns.rdtypes.ANY.DNSKEY import DNSKEY
class PublicEDDSA(CryptographyPublicKey):
def verify(self, signature: bytes, data: bytes) -> None:
self.key.verify(signature, data)
def encode_key_bytes(self) -> bytes:
"""Encode a public key per RFC 8080, section 3."""
return self.key.public_bytes(
encoding=serialization.Encoding.Raw, format=serialization.PublicFormat.Raw
)
@classmethod
def from_dnskey(cls, key: DNSKEY) -> "PublicEDDSA":
cls._ensure_algorithm_key_combination(key)
return cls(
key=cls.key_cls.from_public_bytes(key.key),
)
class PrivateEDDSA(CryptographyPrivateKey):
public_cls: Type[PublicEDDSA]
def sign(
self,
data: bytes,
verify: bool = False,
deterministic: bool = True,
) -> bytes:
"""Sign using a private key per RFC 8080, section 4."""
signature = self.key.sign(data)
if verify:
self.public_key().verify(signature, data)
return signature
@classmethod
def generate(cls) -> "PrivateEDDSA":
return cls(key=cls.key_cls.generate())
class PublicED25519(PublicEDDSA):
key: ed25519.Ed25519PublicKey
key_cls = ed25519.Ed25519PublicKey
algorithm = Algorithm.ED25519
class PrivateED25519(PrivateEDDSA):
key: ed25519.Ed25519PrivateKey
key_cls = ed25519.Ed25519PrivateKey
public_cls = PublicED25519
class PublicED448(PublicEDDSA):
key: ed448.Ed448PublicKey
key_cls = ed448.Ed448PublicKey
algorithm = Algorithm.ED448
class PrivateED448(PrivateEDDSA):
key: ed448.Ed448PrivateKey
key_cls = ed448.Ed448PrivateKey
public_cls = PublicED448