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https://git.sr.ht/~tsileo/microblog.pub
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75 lines
2.3 KiB
Python
75 lines
2.3 KiB
Python
import base64
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from pathlib import Path
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from typing import Any
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from Crypto.PublicKey import RSA
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from Crypto.Util import number
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def generate_key(key_path: Path) -> None:
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if key_path.exists():
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raise ValueError(f"Key at {key_path} already exists")
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k = RSA.generate(2048)
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privkey_pem = k.exportKey("PEM").decode("utf-8")
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key_path.write_text(privkey_pem)
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def get_pubkey_as_pem(key_path: Path) -> str:
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text = key_path.read_text()
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return RSA.import_key(text).public_key().export_key("PEM").decode("utf-8")
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class Key(object):
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DEFAULT_KEY_SIZE = 2048
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def __init__(self, owner: str, id_: str | None = None) -> None:
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self.owner = owner
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self.privkey_pem: str | None = None
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self.pubkey_pem: str | None = None
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self.privkey: RSA.RsaKey | None = None
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self.pubkey: RSA.RsaKey | None = None
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self.id_ = id_
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def load_pub(self, pubkey_pem: str) -> None:
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self.pubkey_pem = pubkey_pem
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self.pubkey = RSA.importKey(pubkey_pem)
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def load(self, privkey_pem: str) -> None:
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self.privkey_pem = privkey_pem
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self.privkey = RSA.importKey(self.privkey_pem)
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self.pubkey_pem = self.privkey.publickey().exportKey("PEM").decode("utf-8")
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def new(self) -> None:
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k = RSA.generate(self.DEFAULT_KEY_SIZE)
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self.privkey_pem = k.exportKey("PEM").decode("utf-8")
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self.pubkey_pem = k.publickey().exportKey("PEM").decode("utf-8")
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self.privkey = k
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def key_id(self) -> str:
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return self.id_ or f"{self.owner}#main-key"
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def to_dict(self) -> dict[str, Any]:
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return {
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"id": self.key_id(),
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"owner": self.owner,
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"publicKeyPem": self.pubkey_pem,
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"type": "Key",
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}
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@classmethod
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def from_dict(cls, data):
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try:
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k = cls(data["owner"], data["id"])
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k.load_pub(data["publicKeyPem"])
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except KeyError:
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raise ValueError(f"bad key data {data!r}")
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return k
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def to_magic_key(self) -> str:
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mod = base64.urlsafe_b64encode(
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number.long_to_bytes(self.privkey.n) # type: ignore
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).decode("utf-8")
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pubexp = base64.urlsafe_b64encode(
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number.long_to_bytes(self.privkey.e) # type: ignore
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).decode("utf-8")
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return f"data:application/magic-public-key,RSA.{mod}.{pubexp}"
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