Advisories for Cargo/Libp2p-Core package

Affected versions of this crate did not check that the public key the signature was created with matches the peer ID of the peer record. Any combination was considered valid. This allows an attacker to republish an existing PeerRecord with a different PeerId.

Affected versions of this crate did not properly verify ed25519 signatures. Any signature with a correct length was considered valid. This allows an attacker to impersonate any node identity.