mirror of
https://github.com/malmeloo/FindMy.py.git
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52 lines
1.5 KiB
Python
52 lines
1.5 KiB
Python
import base64
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import secrets
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from cryptography.hazmat.backends import default_backend
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import hashlib
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from cryptography.hazmat.primitives.asymmetric import ec
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class KeyPair:
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def __init__(self, private_key: bytes):
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priv_int = int.from_bytes(private_key, "big")
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self._priv_key = ec.derive_private_key(
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priv_int, ec.SECP224R1(), default_backend()
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)
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@classmethod
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def generate(cls) -> "KeyPair":
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return cls(secrets.token_bytes(28))
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@classmethod
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def from_b64(cls, key_b64: str) -> "KeyPair":
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return cls(base64.b64decode(key_b64))
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@property
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def private_key_bytes(self) -> bytes:
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key_bytes = self._priv_key.private_numbers().private_value
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return int.to_bytes(key_bytes, 28, "big")
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@property
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def private_key_b64(self) -> str:
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return base64.b64encode(self.private_key_bytes).decode("ascii")
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@property
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def adv_key_bytes(self) -> bytes:
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key_bytes = self._priv_key.public_key().public_numbers().x
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return int.to_bytes(key_bytes, 28, "big")
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@property
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def adv_key_b64(self) -> str:
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return base64.b64encode(self.adv_key_bytes).decode("ascii")
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@property
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def hashed_adv_key_bytes(self) -> bytes:
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return hashlib.sha256(self.adv_key_bytes).digest()
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@property
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def hashed_adv_key_b64(self) -> str:
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return base64.b64encode(self.hashed_adv_key_bytes).decode("ascii")
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def dh_exchange(self, other_pub_key: ec.EllipticCurvePublicKey) -> bytes:
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return self._priv_key.exchange(ec.ECDH(), other_pub_key)
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