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