rust-libp2p/core/src/keys.proto

syntax = "proto2";

enum KeyType {
  RSA = 0;
  Ed25519 = 1;
  Secp256k1 = 2;
}

message PublicKey {
  required KeyType Type = 1;
  required bytes Data = 2;
}

message PrivateKey {
  required KeyType Type = 1;
  required bytes Data = 2;
}