py-libp2p/libp2p/security/base_transport.py

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import secrets
from typing import Callable
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from libp2p.crypto.keys import KeyPair
from libp2p.peer.id import ID
from libp2p.security.secure_transport_interface import ISecureTransport
def default_secure_bytes_provider(n: int) -> bytes:
return secrets.token_bytes(n)
class BaseSecureTransport(ISecureTransport):
"""
``BaseSecureTransport`` is not fully instantiated from its abstract classes as it
is only meant to be used in clases that derive from it.
Clients can provide a strategy to get cryptographically secure bytes of a given length.
A default implementation is provided using the ``secrets`` module from the
standard library.
"""
def __init__(
self,
local_key_pair: KeyPair,
secure_bytes_provider: Callable[[int], bytes] = default_secure_bytes_provider,
) -> None:
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self.local_private_key = local_key_pair.private_key
self.local_peer = ID.from_pubkey(local_key_pair.public_key)
self.secure_bytes_provider = secure_bytes_provider